/* 镜相 Jìngxiàng · Interaction Primitives
 * 日相设计：温白底 + 深墨骨 + 神秘金点缀
 * 核心工具类：
 *   .paper-card      卡片主体（暖白 + paper 阴影）
 *   .ink-frame       深墨边框（取代 border 灰线）
 *   .gold-thread     神秘金细线（塔罗 / 八字 分隔）
 *   .rabbit-bubble   小兔子对话气泡
 *   .sage-chip       社区 / 标签 chip
 *   .shimmer-gold    金色闪烁（card 翻开时）
 */

:root {
  color-scheme: light;
  --paper: #FAFAF7;
  --paper-bright: #FFFFFF;
  --paper-warm: #F5F1E8;
  --paper-dim: #EFECE4;
  --paper-edge: #E4DFD3;
  --ink: #1A1D29;
  --ink-deep: #0E1018;
  --ink-soft: #3A3F4E;
  --ink-mute: #6B7080;
  --mystic: #C5A358;
  --rabbit: #E9A9A9;
  --sage: #7AA081;

  /* 3D 模型分辨率倍数：卡片/书本以 r× 自然尺寸渲染，再 scale(1/r) 视觉还原
     —— 设为 2 时，贴图像素密度翻倍，portal 放大动画时减少采样模糊
     —— 设为 1 时回退到原始尺寸（节省 GPU 显存） */
  --3d-r: 2;
  --3d-r-inv: 0.5;
}

* {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, "Noto Sans SC", system-ui, sans-serif;
}

body {
  background-image:
    radial-gradient(circle at 8% 8%, rgba(197, 163, 88, 0.06) 0%, transparent 45%),
    radial-gradient(circle at 92% 92%, rgba(233, 169, 169, 0.05) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, rgba(122, 160, 129, 0.03) 0%, transparent 55%);
  background-attachment: fixed;
}

/* ——— Display font（宋体神秘感）——— */
.font-display {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* ——— 渐变文字 ——— */
.gold-text {
  background: linear-gradient(135deg, #C5A358 0%, #9A7E3E 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.ink-text {
  background: linear-gradient(135deg, #1A1D29 0%, #0E1018 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.rabbit-text {
  background: linear-gradient(135deg, #E9A9A9 0%, #C97979 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ——— Primitive #1：paper-card（主卡片）——— */
.paper-card {
  background: var(--paper-bright);
  border-radius: 1.25rem;
  box-shadow:
    0 4px 12px rgba(30, 30, 40, 0.06),
    0 2px 4px rgba(30, 30, 40, 0.04);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.paper-card:hover {
  box-shadow:
    0 12px 32px rgba(30, 30, 40, 0.08),
    0 4px 12px rgba(30, 30, 40, 0.05);
  transform: translateY(-2px);
}

.paper-card--flat {
  box-shadow: 0 1px 2px rgba(30, 30, 40, 0.04);
}

.paper-card--flat:hover {
  transform: none;
  box-shadow: 0 4px 12px rgba(30, 30, 40, 0.06);
}

/* ——— Primitive #2：ink-frame（深墨内线）——— */
.ink-frame {
  position: relative;
}

.ink-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(14, 16, 24, 0.08);
}

.ink-frame--strong::after {
  box-shadow: inset 0 0 0 1.5px rgba(14, 16, 24, 0.18);
}

/* ——— Primitive #3：gold-thread（神秘金细线）——— */
.gold-thread {
  position: relative;
}

.gold-thread::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow:
    inset 0 0 0 1px rgba(197, 163, 88, 0.4),
    0 0 20px rgba(197, 163, 88, 0.08);
}

.gold-thread--on::before {
  box-shadow:
    inset 0 0 0 1.5px rgba(197, 163, 88, 0.8),
    0 0 30px rgba(197, 163, 88, 0.2);
}

/* ——— Primitive #4：rabbit-bubble（小兔子气泡）——— */
.rabbit-bubble {
  background: linear-gradient(135deg, #FBEDED 0%, #F5D5D5 100%);
  border-radius: 1.25rem;
  box-shadow:
    0 4px 14px rgba(233, 169, 169, 0.18),
    inset 0 0 0 1px rgba(233, 169, 169, 0.25);
  color: var(--ink);
  position: relative;
}

.rabbit-bubble::before {
  content: '';
  position: absolute;
  left: -6px;
  bottom: 14px;
  width: 14px;
  height: 14px;
  background: linear-gradient(135deg, #FBEDED 0%, #F5D5D5 100%);
  border-radius: 3px;
  transform: rotate(45deg);
}

.user-bubble {
  background: var(--ink);
  color: var(--paper-bright);
  border-radius: 1.25rem;
  box-shadow: 0 4px 12px rgba(14, 16, 24, 0.14);
  position: relative;
}

.user-bubble::before {
  content: '';
  position: absolute;
  right: -6px;
  bottom: 14px;
  width: 14px;
  height: 14px;
  background: var(--ink);
  border-radius: 3px;
  transform: rotate(45deg);
}

/* ——— Primitive #5：sage-chip（标签 / 社区）——— */
.sage-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 9999px;
  background: #EAF1EC;
  color: var(--sage);
  box-shadow: inset 0 0 0 1px rgba(122, 160, 129, 0.25);
}

.mystic-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 9999px;
  background: #F5ECD8;
  color: var(--mystic);
  box-shadow: inset 0 0 0 1px rgba(197, 163, 88, 0.3);
}

.rabbit-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 9999px;
  background: #FBEDED;
  color: #C97979;
  box-shadow: inset 0 0 0 1px rgba(233, 169, 169, 0.3);
}

.ink-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 9999px;
  background: var(--paper-dim);
  color: var(--ink-soft);
  box-shadow: inset 0 0 0 1px rgba(14, 16, 24, 0.08);
}

/* ——— Buttons ——— */
.btn-ink {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: Manrope, "Noto Sans SC", sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 9999px;
  background: var(--ink);
  color: var(--paper-bright);
  box-shadow: 0 4px 12px rgba(14, 16, 24, 0.18);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-ink:hover {
  background: var(--ink-deep);
  box-shadow: 0 8px 20px rgba(14, 16, 24, 0.24);
  transform: translateY(-1px);
}

.btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: Manrope, "Noto Sans SC", sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 9999px;
  background: linear-gradient(135deg, #E8D8B0 0%, #C5A358 52%, #9A7E3E 100%);
  color: var(--ink-deep);
  box-shadow: 0 4px 14px rgba(197, 163, 88, 0.32);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-gold:hover {
  box-shadow: 0 8px 22px rgba(197, 163, 88, 0.42);
  transform: translateY(-1px);
}

.btn-rabbit {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: Manrope, "Noto Sans SC", sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 9999px;
  background: linear-gradient(135deg, #F5D5D5 0%, #E9A9A9 100%);
  color: #7A2929;
  box-shadow: 0 4px 14px rgba(233, 169, 169, 0.28);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-rabbit:hover {
  box-shadow: 0 8px 22px rgba(233, 169, 169, 0.4);
  transform: translateY(-1px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: Manrope, "Noto Sans SC", sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 9999px;
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1.5px rgba(14, 16, 24, 0.15);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

.btn-ghost:hover {
  background: var(--paper-dim);
  box-shadow: inset 0 0 0 1.5px rgba(14, 16, 24, 0.35);
}

.btn-sm { padding: 6px 14px; font-size: 0.8125rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }

/* ——— Form elements ——— */
.paper-input {
  width: 100%;
  padding: 10px 14px;
  font-family: Inter, "Noto Sans SC", sans-serif;
  font-size: 0.9375rem;
  color: var(--ink);
  background: var(--paper-bright);
  border: none;
  border-radius: 0.75rem;
  box-shadow: inset 0 0 0 1.5px rgba(14, 16, 24, 0.1);
  transition: box-shadow 0.2s ease;
  outline: none;
}

.paper-input:focus {
  box-shadow: inset 0 0 0 2px rgba(14, 16, 24, 0.5);
}

.paper-input::placeholder {
  color: var(--ink-mute);
}

textarea.paper-input {
  resize: vertical;
  min-height: 6rem;
  font-family: Inter, "Noto Sans SC", sans-serif;
  line-height: 1.6;
}

select.paper-input {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='M4 6l4 4 4-4' stroke='%236B7080' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* ——— Modal ——— */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(14, 16, 24, 0.35);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.modal-backdrop.open {
  opacity: 1;
}

.modal-panel {
  background: var(--paper-bright);
  border-radius: 1.25rem;
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 24px 60px rgba(14, 16, 24, 0.24);
  transform: scale(0.95);
  transition: transform 0.25s ease;
}

.modal-backdrop.open .modal-panel {
  transform: scale(1);
}

/* ——— Toast ——— */
.toast {
  position: fixed;
  top: 24px;
  right: 24px;
  padding: 12px 20px;
  background: var(--ink);
  color: var(--paper-bright);
  border-radius: 9999px;
  box-shadow: 0 8px 24px rgba(14, 16, 24, 0.24);
  font-family: Inter, "Noto Sans SC", sans-serif;
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 200;
  transform: translateY(-12px);
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

.toast--success { background: var(--ink); }
.toast--warn    { background: #C88A2E; }
.toast--error   { background: #B5483D; }

/* ——— Tarot card back / face ———
 * 采用「外壳 perspective + 内层 preserve-3d」的标准翻牌结构：
 *   .tarot-card            外壳：提供 3D 视角 + hover 抬升
 *     .tarot-card__inner   内层：承载 rotateY(180) 翻转 + preserve-3d 3D 上下文
 *       .tarot-card-face   两个绝对定位的面，各自 backface-visibility: hidden
 *         .tarot-card-back 默认朝向观者
 *         .tarot-card-front 预先 rotateY(180)，翻牌后朝向观者
 * ————————————————————————————————————————————————————— */
.tarot-card {
  aspect-ratio: 2 / 3.5;
  border-radius: 1rem;
  cursor: pointer;
  position: relative;
  perspective: 1000px;
  transition: transform 0.4s ease, box-shadow 0.4s ease;
  box-shadow:
    0 8px 22px rgba(14, 16, 24, 0.18),
    0 2px 6px rgba(14, 16, 24, 0.1);
}

.tarot-card:hover:not(.flipped) {
  transform: translateY(-6px);
  box-shadow:
    0 16px 36px rgba(14, 16, 24, 0.22),
    0 4px 12px rgba(14, 16, 24, 0.12);
}

.tarot-card__inner {
  position: absolute;
  inset: 0;
  border-radius: 1rem;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.tarot-card.flipped .tarot-card__inner {
  transform: rotateY(180deg);
}

.tarot-card-face {
  position: absolute;
  inset: 0;
  border-radius: 1rem;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tarot-card-back {
  background:
    radial-gradient(circle at 50% 30%, rgba(232, 216, 176, 0.35) 0%, transparent 55%),
    linear-gradient(135deg, #1A1D29 0%, #0E1018 100%);
  color: var(--mystic);
}

.tarot-card-back::before {
  content: '';
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(197, 163, 88, 0.5);
  border-radius: 0.75rem;
}

.tarot-card-back::after {
  content: '';
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(197, 163, 88, 0.25);
  border-radius: 0.625rem;
}

/* 暗色系卡面：与 .tarot-card-back 同系 midnight+gold，填满整张卡。
   牌名/正逆位一律挪到卡下方 caption，卡面只剩象形画面。 */
.tarot-card-front {
  background:
    radial-gradient(circle at 50% 25%, rgba(232, 216, 176, 0.10) 0%, transparent 55%),
    linear-gradient(160deg, #15182A 0%, #0B0D17 100%);
  transform: rotateY(180deg);
  box-shadow:
    inset 0 0 0 1px rgba(197, 163, 88, 0.45),
    inset 0 0 0 3px rgba(14, 16, 24, 0.35);
  padding: 8px;
  flex-direction: column;
  justify-content: center;
}

.tarot-card-front .card-image-wrap {
  width: 100%;
  height: 100%;
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 0.5rem;
  background:
    radial-gradient(circle at 50% 30%, rgba(197, 163, 88, 0.06) 0%, transparent 60%),
    #0E1018;
  box-shadow:
    inset 0 0 0 1px rgba(197, 163, 88, 0.28),
    inset 0 0 14px rgba(0, 0, 0, 0.55);
}

.tarot-card-front .card-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
  transition: transform 0.4s ease;
  /* SVG 是黑线描 + 白底 → invert 后变成白线描 + 黑底，契合暗色系；
     再压一点亮度，让线条带一点金色透气感（靠容器内阴影叠色实现）。 */
  filter: invert(1) brightness(0.92) contrast(1.05);
  mix-blend-mode: screen;
}

.tarot-card-front .card-emoji-fallback {
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
}

.tarot-card-front .card-emoji {
  font-size: 3rem;
  line-height: 1;
  color: rgba(232, 216, 176, 0.9);
  filter: drop-shadow(0 0 8px rgba(197, 163, 88, 0.35));
}

.tarot-card-front--reversed .card-image,
.tarot-card-front--reversed .card-emoji {
  transform: rotate(180deg);
}

/* ——— Rabbit character placeholder ——— */
.rabbit-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FBEDED 0%, #F5D5D5 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow:
    0 4px 14px rgba(233, 169, 169, 0.28),
    inset 0 0 0 1.5px rgba(233, 169, 169, 0.4);
  animation: rabbit-idle 4s ease-in-out infinite;
}

@keyframes rabbit-idle {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  25%      { transform: translateY(-3px) rotate(-1deg); }
  75%      { transform: translateY(-2px) rotate(1deg); }
}

/* ——— Divider ornament（东方神秘分隔符）——— */
.divider-ornament {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--mystic);
  font-size: 0.75rem;
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  letter-spacing: 0.2em;
}

.divider-ornament::before,
.divider-ornament::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(197, 163, 88, 0.5) 50%, transparent 100%);
}

/* ——— Shimmer / 高光扫过 ——— */
@keyframes shimmer-sweep {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.shimmer-gold {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(197, 163, 88, 0.3) 50%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: shimmer-sweep 2.5s ease-in-out infinite;
}

/* ——— Scrollbar ——— */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--paper-dim); border-radius: 10px; }
::-webkit-scrollbar-thumb {
  background: rgba(14, 16, 24, 0.18);
  border-radius: 10px;
  border: 2px solid var(--paper-dim);
}
::-webkit-scrollbar-thumb:hover { background: rgba(14, 16, 24, 0.32); }

/* ——— Decoration：可装饰的 SVG 素材图层（第二代）———
 * 所有素材 SVG 用 currentColor，落地到 DOM 时有两种方式：
 *   (A) 直接 <img src="...svg">：颜色固定为 SVG 里的 currentColor=black
 *   (B) 用 mask-image + background-color：可以继承父容器 color，主题色跟随
 * 下面的工具类走 (B)，所以可以在不同主题色的容器里复用同一张 SVG。
 */

/* 等高线大底纹：hero 背景最合适 */
.bg-topography {
  position: relative;
  isolation: isolate;
}
.bg-topography::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-color: currentColor;
  -webkit-mask: url("assets/bg/topography.svg") repeat center / 160px 160px;
          mask: url("assets/bg/topography.svg") repeat center / 160px 160px;
  opacity: 0.08;
}
.bg-topography--strong::before { opacity: 0.16; }
.bg-topography--soft::before   { opacity: 0.04; }

/* 深一级路径：当 ::before 被占用时（例如已有 gold-thread），
   用 .bg-topography-img 作为独立 <div> 叠在前面 */
.bg-topography-img {
  background-image: url("assets/bg/topography.svg");
  background-repeat: repeat;
  background-size: 160px 160px;
}

/* 点阵底：比等高线更克制，适合二级区块 */
.bg-dot-grid {
  position: relative;
  isolation: isolate;
}
.bg-dot-grid::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background-color: currentColor;
  -webkit-mask: url("assets/bg/dot-grid.svg") repeat center / 48px 48px;
          mask: url("assets/bg/dot-grid.svg") repeat center / 48px 48px;
  opacity: 0.22;
}
.bg-dot-grid--soft::before { opacity: 0.12; }

/* 分隔线（SVG 版）：中间一颗小星，左右细线往两边淡出 */
.ornament-divider {
  display: block;
  height: 24px;
  width: 100%;
  max-width: 400px;
  margin: 40px auto;
  background-color: currentColor;
  -webkit-mask: url("assets/ornaments/divider-sparkle.svg") no-repeat center / contain;
          mask: url("assets/ornaments/divider-sparkle.svg") no-repeat center / contain;
  opacity: 0.7;
}
.ornament-divider--mystic { color: var(--mystic); }
.ornament-divider--ink    { color: var(--ink-mute); }
.ornament-divider--rabbit { color: var(--rabbit); }

/* 八相月横幅：profile / tarot 页的调调 */
.ornament-moons {
  display: block;
  height: 60px;
  width: 100%;
  max-width: 480px;
  background-color: currentColor;
  -webkit-mask: url("assets/ornaments/moon-phases.svg") no-repeat center / contain;
          mask: url("assets/ornaments/moon-phases.svg") no-repeat center / contain;
  opacity: 0.55;
}
.ornament-moons--mystic { color: var(--mystic); opacity: 0.7; }

/* 卡片右上角花纹：需要有 position:relative 的父元素 */
.corner-flourish {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 56px;
  height: 56px;
  pointer-events: none;
  background-color: currentColor;
  -webkit-mask: url("assets/ornaments/corner-flourish.svg") no-repeat center / contain;
          mask: url("assets/ornaments/corner-flourish.svg") no-repeat center / contain;
  opacity: 0.4;
}
.corner-flourish--mystic { color: var(--mystic); opacity: 0.55; }
.corner-flourish--rabbit { color: var(--rabbit); opacity: 0.55; }

/* 空态插画容器：自动居中 + 墨软色 */
.empty-state-art {
  display: block;
  width: 240px;
  height: 200px;
  margin: 0 auto;
  color: var(--ink-mute);
  opacity: 0.8;
  background-color: currentColor;
  -webkit-mask: url("assets/illust/empty-state.svg") no-repeat center / contain;
          mask: url("assets/illust/empty-state.svg") no-repeat center / contain;
}
.empty-state-art--mystic { color: var(--mystic); }
.empty-state-art--rabbit { color: var(--rabbit); }

/* Section marker：带两条小线的栏目标签 */
.section-marker {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 0.6875rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--mystic);
  margin-bottom: 14px;
}
.section-marker::before,
.section-marker::after {
  content: '';
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, currentColor 50%, transparent 100%);
}
.section-marker--ink { color: var(--ink-mute); }

/* Drop cap（首字放大）：适合长文/读心卡 */
.drop-cap::first-letter {
  float: left;
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: 3.25rem;
  line-height: 0.9;
  font-weight: 600;
  margin: 0.15em 0.12em 0 0;
  color: var(--mystic);
}

/* ==================================================================
 * 3D Hero sections — 首页主入口（塔罗牌 & 测试手札）
 * 纯 CSS 3D：perspective + preserve-3d + rotate/translate + 浮动动画
 * 无外部依赖；无 JS；尊重 prefers-reduced-motion
 * ================================================================== */

/* 通用舞台：两列布局（插画 × 文案），小屏单列 */
.hero-3d {
  position: relative;
  overflow: hidden;
  padding: 64px 24px;
  min-height: 88vh;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
@media (min-width: 1024px) {
  .hero-3d {
    grid-template-columns: 1.05fr 1fr;
    gap: 48px;
    padding: 72px 48px;
  }
  .hero-3d--reverse .hero-3d__stage { grid-column: 2; grid-row: 1; }
  .hero-3d--reverse .hero-3d__text  { grid-column: 1; grid-row: 1; }
}

.hero-3d__text {
  position: relative;
  z-index: 2;
  max-width: 560px;
  justify-self: center;
}
@media (min-width: 1024px) {
  .hero-3d__text { justify-self: flex-start; }
  .hero-3d--reverse .hero-3d__text { justify-self: flex-end; }
}

.hero-3d__stage {
  perspective: 1800px;
  perspective-origin: 50% 40%;
  height: 540px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
@media (min-width: 768px) {
  .hero-3d__stage { height: 640px; }
}

.hero-3d__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 9999px;
  background: var(--paper-warm);
  color: var(--ink-soft);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  font-weight: 600;
  margin-bottom: 20px;
  text-transform: uppercase;
}
.hero-3d__eyebrow--mystic { box-shadow: inset 0 0 0 1px rgba(197,163,88,0.35); color: #8a6c32; }
.hero-3d__eyebrow--ink    { box-shadow: inset 0 0 0 1px rgba(14,16,24,0.15); }
.hero-3d__eyebrow--rabbit { box-shadow: inset 0 0 0 1px rgba(233,169,169,0.45); color: #a96a6a; background: #FBEDED; }

.hero-3d__headline {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 600;
  font-size: clamp(2.5rem, 5.5vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: 0.01em;
  margin-bottom: 22px;
  color: var(--ink);
}

.hero-3d__sub {
  font-size: 1.0625rem;
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 32px;
}

.hero-3d__cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ——— Panel A 背景：暖纸 + 等高线 + 金色浮光 ——— */
.hero-3d--mystic {
  background:
    radial-gradient(circle at 88% 20%, rgba(197,163,88,0.12) 0%, transparent 55%),
    radial-gradient(circle at 12% 90%, rgba(197,163,88,0.06) 0%, transparent 45%),
    linear-gradient(180deg, #FBF8F0 0%, #F7F1E3 100%);
  color: var(--mystic);
}
.hero-3d--mystic .hero-3d__bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-color: currentColor;
  -webkit-mask: url("assets/bg/topography.svg") repeat center / 200px 200px;
          mask: url("assets/bg/topography.svg") repeat center / 200px 200px;
  opacity: 0.09;
}

/* ——— Panel C 背景：暖纸底 + 极淡粉晕（点缀级） ———
 * 起始色接 Panel B 的结束色 (#F1EDE4)，保证 B→C 无缝；
 * 只在右上角放一枚极淡粉色光晕呼应小兔子的位置，左下角一抹暖沙色。
 * 不让粉色上身，主调仍是 paper 家族。
 */
.hero-3d--rabbit {
  background:
    radial-gradient(circle at 82% 18%, rgba(233,169,169,0.14) 0%, transparent 55%),
    radial-gradient(circle at 12% 88%, rgba(197,163,88,0.06) 0%, transparent 45%),
    linear-gradient(180deg, #F1EDE4 0%, #F4EEE1 50%, #F0E7D4 100%);
  color: var(--ink-mute);
}
.hero-3d--rabbit .hero-3d__bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(ellipse at 50% 120%, rgba(201,121,121,0.06) 0%, transparent 55%);
  opacity: 0.8;
}

/* ——— Panel B 背景：冷纸 + 点阵 + 墨色浮光 ——— */
.hero-3d--ink {
  background:
    radial-gradient(circle at 15% 20%, rgba(14,16,24,0.08) 0%, transparent 55%),
    radial-gradient(circle at 85% 85%, rgba(122,160,129,0.08) 0%, transparent 50%),
    linear-gradient(180deg, #FAFAF7 0%, #F1EDE4 100%);
  color: var(--ink-mute);
}
.hero-3d--ink .hero-3d__bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-color: currentColor;
  -webkit-mask: url("assets/bg/dot-grid.svg") repeat center / 48px 48px;
          mask: url("assets/bg/dot-grid.svg") repeat center / 48px 48px;
  opacity: 0.22;
}

.hero-3d > * { position: relative; z-index: 1; }

/* =========================================================
 * Bunny 3D · 小兔子树洞 Hero 舞台
 *   - 父 .bunny-3d-wrap 只管倾斜 + 漂浮；canvas 内部渲染 GLB
 *   - 下方有一枚柔和的地面投影椭圆，模型"半悬浮"
 *   - 整体气质：面向观众、微微左偏、慢速呼吸，不做夸张旋转
 * ========================================================= */
.bunny-3d-wrap {
  position: relative;
  width: min(520px, 92%);
  aspect-ratio: 1 / 1;
  /* --wrap-offset-y: 整个渲染框的基础下沉量（投影不跟动），改这一个数字就能调"兔子离地"
     --float-y       : JS 每帧写入的漂浮位移 —— 连续采样，无 keyframe 起止 */
  --wrap-offset-y: 32px;
  transform: rotateX(-4deg) rotateY(-8deg) rotateZ(-2deg)
             translateY(calc(var(--wrap-offset-y) + var(--float-y, 0px)));
  transform-style: preserve-3d;
  filter: drop-shadow(0 24px 30px rgba(201, 121, 121, 0.22));
  will-change: transform;
}
.bunny-3d-wrap canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
  background: transparent;
}
/* 地面柔和椭圆投影：比模型更下一层，跟随舞台而不跟着兔子抖 */
.bunny-3d-pedestal {
  position: absolute;
  left: 50%;
  bottom: 6%;
  width: 58%;
  height: 48px;
  /* scale/opacity 也由 JS 每帧写入 —— 兔子越高影子越小越淡 */
  transform: translateX(-50%) scale(var(--ped-s, 1));
  opacity: var(--ped-o, 1);
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(201, 121, 121, 0.28) 0%, rgba(233, 169, 169, 0.12) 40%, transparent 72%);
  filter: blur(6px);
  pointer-events: none;
  z-index: 0;
}
/* GLB 尚未加载时的 emoji 占位（fallback） */
.bunny-3d-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(120px, 22vw, 220px);
  filter: drop-shadow(0 12px 20px rgba(201, 121, 121, 0.35));
  user-select: none;
  pointer-events: none;
}
.bunny-3d-wrap.is-loaded .bunny-3d-fallback { opacity: 0; transition: opacity .4s ease .1s; }

/* 漂浮动画不再由 CSS keyframe 驱动 —— 全部改成 JS rAF 每帧写 --float-y / --ped-s / --ped-o
 * 好处：
 *   1) hover 切换时幅度/速度都是从"当下值"平滑逼近目标，不会重置相位不会跳
 *   2) 可以随时由外部状态（情绪值、对话节奏…）实时改变目标值
 *   3) prefers-reduced-motion 由 JS 统一处理（不启动 rAF，兔子保持静止）
 * */

/* =========================================================
 * Panel D · Flashcard 高情商回复 Hero
 *   - 较淡薄荷绿（mint + sage 家族），与 Panel C 的暖粉晕形成冷暖对比
 *   - 三张卡叠在一起，微错位（rotateZ + translateX/Y）
 *   - 卡片整体在空中悬浮（CSS keyframes · 低频、幅度小）
 *   - hover 时顶卡略抬、底卡略推开，强调"可互动"
 * ========================================================= */
.hero-3d--flashcard {
  background:
    radial-gradient(circle at 18% 22%, rgba(156,207,168,0.18) 0%, transparent 55%),
    radial-gradient(circle at 85% 82%, rgba(122,160,129,0.10) 0%, transparent 50%),
    linear-gradient(180deg, #E8F2E8 0%, #EFF6EE 45%, #DEEADF 100%);
  color: var(--ink-mute);
}
.hero-3d--flashcard .hero-3d__bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-color: currentColor;
  -webkit-mask: url("assets/bg/topography.svg") repeat center / 220px 220px;
          mask: url("assets/bg/topography.svg") repeat center / 220px 220px;
  opacity: 0.06;
}

.hero-3d__eyebrow--flashcard {
  box-shadow: inset 0 0 0 1px rgba(122, 160, 129, 0.4);
  color: #4F7B5A;
  background: #E4F0E5;
}

.flashcard-text {
  background: linear-gradient(135deg, #7AA081 0%, #4F7B5A 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.flashcard-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 9999px;
  background: #E4F0E5;
  color: #4F7B5A;
  box-shadow: inset 0 0 0 1px rgba(122, 160, 129, 0.3);
}

.btn-flashcard {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-family: Manrope, "Noto Sans SC", sans-serif;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 9999px;
  background: linear-gradient(135deg, #C4E0C8 0%, #7AA081 100%);
  color: #1F3828;
  box-shadow: 0 4px 14px rgba(122, 160, 129, 0.3);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}
.btn-flashcard:hover {
  box-shadow: 0 8px 22px rgba(122, 160, 129, 0.45);
  transform: translateY(-1px);
}

/* ——— Flashcard 3D 舞台 ———————————————————— */
.flashcard-3d-wrap {
  position: relative;
  width: min(520px, 92%);
  aspect-ratio: 1 / 1;
  display: block;
  perspective: 1400px;
  perspective-origin: 50% 45%;
  transform-style: preserve-3d;
  cursor: pointer;
  text-decoration: none;
}

/* 地面柔和椭圆投影 */
.flashcard-3d-pedestal {
  position: absolute;
  left: 50%;
  bottom: 8%;
  width: 56%;
  height: 40px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(79, 123, 90, 0.22) 0%, rgba(122, 160, 129, 0.10) 42%, transparent 72%);
  filter: blur(6px);
  pointer-events: none;
  z-index: 0;
}

.flashcard-3d-stack {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
  animation: flashcardStackFloat 7.5s ease-in-out infinite;
  will-change: transform;
}

/* 单张卡 —— 所有卡公共样式 */
.flashcard-3d-card {
  position: absolute;
  width: clamp(220px, 58%, 300px);
  aspect-ratio: 3 / 4;
  border-radius: 18px;
  padding: 22px 22px 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(160deg, #F7FBF6 0%, #E6F1E5 100%);
  box-shadow:
    0 2px 6px rgba(36, 66, 44, 0.06),
    0 18px 40px rgba(36, 66, 44, 0.14),
    inset 0 0 0 1px rgba(122, 160, 129, 0.22);
  backface-visibility: hidden;
  transform-style: preserve-3d;
  transition: transform .45s ease, box-shadow .45s ease;
  will-change: transform;
}

/* 背后最底一张：最远、最斜、略暗 */
.flashcard-3d-card--back {
  transform: translate3d(40px, 32px, -60px) rotateZ(7deg) rotateY(-6deg);
  background: linear-gradient(160deg, #DCEBDD 0%, #C5DDC8 100%);
  box-shadow:
    0 2px 6px rgba(36, 66, 44, 0.05),
    0 14px 30px rgba(36, 66, 44, 0.10),
    inset 0 0 0 1px rgba(122, 160, 129, 0.28);
  opacity: 0.88;
  z-index: 1;
}

/* 中间一张 */
.flashcard-3d-card--mid {
  transform: translate3d(-28px, 14px, -28px) rotateZ(-4deg) rotateY(3deg);
  background: linear-gradient(160deg, #EBF4EA 0%, #D3E4D3 100%);
  box-shadow:
    0 2px 6px rgba(36, 66, 44, 0.05),
    0 16px 34px rgba(36, 66, 44, 0.12),
    inset 0 0 0 1px rgba(122, 160, 129, 0.25);
  z-index: 2;
}

/* 最上一张：正对观众，最显眼 */
.flashcard-3d-card--front {
  transform: translate3d(12px, -18px, 40px) rotateZ(-2deg);
  z-index: 3;
}

/* hover 时整体打开一点 */
.flashcard-3d-wrap:hover .flashcard-3d-card--back {
  transform: translate3d(64px, 42px, -60px) rotateZ(10deg) rotateY(-8deg);
}
.flashcard-3d-wrap:hover .flashcard-3d-card--mid {
  transform: translate3d(-50px, 22px, -28px) rotateZ(-7deg) rotateY(5deg);
}
.flashcard-3d-wrap:hover .flashcard-3d-card--front {
  transform: translate3d(14px, -30px, 70px) rotateZ(-3deg);
  box-shadow:
    0 4px 8px rgba(36, 66, 44, 0.08),
    0 26px 52px rgba(36, 66, 44, 0.18),
    inset 0 0 0 1px rgba(122, 160, 129, 0.3);
}

/* 卡面内部结构 */
.flashcard-3d-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.flashcard-3d-card__tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  border-radius: 9999px;
  background: #DCEBDD;
  color: #3C5E44;
  box-shadow: inset 0 0 0 1px rgba(122, 160, 129, 0.4);
}
.flashcard-3d-card__tag--hot {
  background: linear-gradient(135deg, #9FCBA6 0%, #7AA081 100%);
  color: #14261B;
  box-shadow: inset 0 0 0 1px rgba(36, 66, 44, 0.22);
}
.flashcard-3d-card__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #B8D5BC;
  box-shadow: inset 0 0 0 1px rgba(122, 160, 129, 0.4);
}
.flashcard-3d-card__dot--hot {
  background: #7AA081;
  box-shadow: 0 0 0 3px rgba(122, 160, 129, 0.22);
}

.flashcard-3d-card__body {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 600;
  font-size: clamp(1.4rem, 2.3vw, 1.8rem);
  line-height: 1.3;
  color: #1F3828;
}

.flashcard-3d-card__foot {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: rgba(36, 66, 44, 0.55);
  text-transform: uppercase;
}

/* 整叠卡的慢悬浮（幅度很小 · 低频）—— rotateX 抖动模拟空中轻微晃动 */
@keyframes flashcardStackFloat {
  0%, 100% { transform: translateY(0)    rotateX(2deg)  rotateY(-1deg); }
  50%      { transform: translateY(-8px) rotateX(-1deg) rotateY(2deg); }
}

@media (prefers-reduced-motion: reduce) {
  .flashcard-3d-stack { animation: none; }
  .flashcard-3d-card,
  .flashcard-3d-wrap:hover .flashcard-3d-card--back,
  .flashcard-3d-wrap:hover .flashcard-3d-card--mid,
  .flashcard-3d-wrap:hover .flashcard-3d-card--front { transition: none; }
}

/* ==================================================================
 * Tarot Cover · 塔罗牌背面色 Hero
 *   - 深夜蓝黑渐变 + 金色双边框 + 四角花纹 + 中央 鏡 水印
 *   - 用于塔罗页 Hero（代替旧 hero-3d--mystic）
 * ================================================================== */
.tarot-cover {
  position: relative;
  overflow: hidden;
  padding: 72px 32px 64px;
  background:
    radial-gradient(ellipse at 20% 15%, rgba(197,163,88,0.08) 0%, transparent 55%),
    radial-gradient(ellipse at 82% 85%, rgba(197,163,88,0.06) 0%, transparent 50%),
    linear-gradient(140deg, #1A1D29 0%, #0E1018 60%, #060812 100%);
  color: rgba(232,216,176,0.92);
  isolation: isolate;
}

.tarot-cover__frame {
  position: absolute;
  inset: 20px;
  pointer-events: none;
  border: 1px solid rgba(197,163,88,0.42);
  box-shadow:
    inset 0 0 0 3px rgba(6,8,18,0.6),
    inset 0 0 0 4px rgba(197,163,88,0.22);
  border-radius: 4px;
}

.tarot-cover__corner {
  position: absolute;
  width: 40px;
  height: 40px;
  pointer-events: none;
  background-image:
    linear-gradient(90deg,  rgba(197,163,88,0.85) 0 12px, transparent 12px),
    linear-gradient(0deg,   rgba(197,163,88,0.85) 0 12px, transparent 12px);
  background-repeat: no-repeat;
  background-size: 12px 1px, 1px 12px;
}
.tarot-cover__corner::before,
.tarot-cover__corner::after {
  content: "";
  position: absolute;
  background: rgba(197,163,88,0.72);
}
.tarot-cover__corner::before { width: 6px; height: 6px; border-radius: 50%; }
.tarot-cover__corner::after  { width: 22px; height: 1px; opacity: 0.55; }

.tarot-cover__corner--tl { top: 28px; left: 28px; }
.tarot-cover__corner--tl::before { top: 0; left: 0; }
.tarot-cover__corner--tl::after  { top: 4px; left: 14px; transform: rotate(45deg); transform-origin: left center; }

.tarot-cover__corner--tr { top: 28px; right: 28px; transform: scaleX(-1); }
.tarot-cover__corner--tr::before { top: 0; left: 0; }
.tarot-cover__corner--tr::after  { top: 4px; left: 14px; transform: rotate(45deg); transform-origin: left center; }

.tarot-cover__corner--bl { bottom: 28px; left: 28px; transform: scaleY(-1); }
.tarot-cover__corner--bl::before { top: 0; left: 0; }
.tarot-cover__corner--bl::after  { top: 4px; left: 14px; transform: rotate(45deg); transform-origin: left center; }

.tarot-cover__corner--br { bottom: 28px; right: 28px; transform: scale(-1,-1); }
.tarot-cover__corner--br::before { top: 0; left: 0; }
.tarot-cover__corner--br::after  { top: 4px; left: 14px; transform: rotate(45deg); transform-origin: left center; }

.tarot-cover__watermark {
  position: absolute;
  top: 50%;
  right: 6%;
  transform: translateY(-50%);
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(180px, 28vw, 360px);
  font-weight: 300;
  line-height: 1;
  color: rgba(197,163,88,0.09);
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.04em;
  text-shadow: 0 2px 30px rgba(197,163,88,0.12);
}

.tarot-cover__star {
  position: absolute;
  pointer-events: none;
  color: rgba(197,163,88,0.55);
  font-size: 14px;
  animation: tarot-cover-star 3.6s ease-in-out infinite;
}
.tarot-cover__star::before { content: "✦"; }
.tarot-cover__star--1 { top: 18%; left: 12%; font-size: 16px; animation-delay: 0s;   }
.tarot-cover__star--2 { top: 34%; left: 38%; font-size: 12px; animation-delay: 1.4s; }
.tarot-cover__star--3 { bottom: 22%; left: 18%; font-size: 18px; animation-delay: 2.6s; }
@keyframes tarot-cover-star {
  0%, 100% { opacity: 0.35; transform: scale(0.85); }
  50%       { opacity: 0.9;  transform: scale(1.05); }
}

.tarot-cover__content {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 12px;
  text-align: left;
}

.tarot-cover__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(197,163,88,0.08);
  box-shadow: inset 0 0 0 1px rgba(197,163,88,0.35);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(232,216,176,0.82);
  margin-bottom: 18px;
}
.tarot-cover__eyebrow-glyph { color: rgba(197,163,88,0.85); font-size: 12px; }

.tarot-cover__headline {
  font-family: "Noto Serif SC", "Songti SC", serif;
  font-size: clamp(32px, 4.2vw, 52px);
  line-height: 1.22;
  font-weight: 600;
  color: rgba(248,240,216,0.98);
  margin: 0 0 18px;
  letter-spacing: -0.01em;
}
.tarot-cover__accent {
  background: linear-gradient(135deg, #E8D8B0 0%, #C5A358 60%, #8a6c32 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.tarot-cover__sub {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232,216,176,0.72);
  margin: 0 0 28px;
  max-width: 580px;
}

.tarot-cover__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.btn-gold-on-dark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  background: linear-gradient(135deg, #E8D8B0 0%, #C5A358 55%, #8a6c32 100%);
  color: #1A1D29;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-decoration: none;
  box-shadow:
    0 6px 20px rgba(197,163,88,0.28),
    inset 0 1px 0 rgba(255,255,255,0.45);
  border: 1px solid rgba(197,163,88,0.55);
  transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
  cursor: pointer;
}
.btn-gold-on-dark:hover {
  transform: translateY(-1px);
  box-shadow:
    0 10px 26px rgba(197,163,88,0.38),
    inset 0 1px 0 rgba(255,255,255,0.55);
  filter: brightness(1.05);
}

.btn-ghost-on-dark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  background: rgba(232,216,176,0.04);
  color: rgba(232,216,176,0.88);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid rgba(197,163,88,0.35);
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
  cursor: pointer;
}
.btn-ghost-on-dark:hover {
  background: rgba(232,216,176,0.08);
  border-color: rgba(197,163,88,0.65);
  color: rgba(248,240,216,1);
}

@media (max-width: 640px) {
  .tarot-cover { padding: 56px 20px 48px; }
  .tarot-cover__frame { inset: 12px; }
  .tarot-cover__corner--tl, .tarot-cover__corner--tr { top: 20px; }
  .tarot-cover__corner--bl, .tarot-cover__corner--br { bottom: 20px; }
  .tarot-cover__corner--tl, .tarot-cover__corner--bl { left: 20px; }
  .tarot-cover__corner--tr, .tarot-cover__corner--br { right: 20px; }
  .tarot-cover__watermark { font-size: 200px; right: -8%; opacity: 0.7; }
}

@media (prefers-reduced-motion: reduce) {
  .tarot-cover__star { animation: none; opacity: 0.5; }
  .btn-gold-on-dark, .btn-ghost-on-dark { transition: none; }
}

/* ==================================================================
 * 3D Tarot Card（高精度版 · --3d-r 控制内部像素密度）
 *   - 卡片自然尺寸 = 视觉尺寸 × r（默认 r=2，即 2 倍光栅密度）
 *   - 用 transform: scale(1/r) 视觉缩回原大小
 *   - portal 动画把 scale 推到 viewport-cover，底层贴图像素多一倍，模糊减少
 * ================================================================== */
.tarot-3d-wrap {
  position: relative;
  display: inline-block;
  /* wrap 保持视觉尺寸，为内部 absolute 卡片提供定位上下文 */
  width: clamp(240px, 28vw, 340px);
  aspect-ratio: 2 / 3.5;
  transform-style: preserve-3d;
}

/* --------------------------------------------------------------
 * .tarot-3d —— 舞台（stage）
 * 书本同款架构：父层只负责浮动 + 空间定位，不画任何卡面视觉。
 *
 * 为什么要这么切？
 *   如果在这里同时画"卡面外观"(background/shadow/border-radius/::before/::after)，
 *   那么悬停翻转(.tarot-3d__flipper rotateY 180) 只会翻"子里的正反面"，
 *   而四角装饰 + 金框 + 底色都留在父层不动，视觉上会看到"牌壳"没翻、
 *   "牌芯"单独翻 —— 违反"整张牌"的物理直觉。
 *
 *   正确做法：父只飘，子(.tarot-3d__flipper)才是"整张牌"，
 *   把卡面的所有视觉搬到 .tarot-3d__face 两面各一份，随翻转同步。
 *   （和 .book-open__stage ↔ .book-open__leaf 关系完全对应）
 * -------------------------------------------------------------- */
.tarot-3d {
  /* 绝对定位以避开 wrap 的自然尺寸（我们用了 2× 内部坐标） */
  position: absolute;
  left: 50%;
  top: 50%;
  width: calc(clamp(240px, 28vw, 340px) * var(--3d-r));
  aspect-ratio: 2 / 3.5;
  border-radius: calc(18px * var(--3d-r));
  transform-style: preserve-3d;
  /* translate(-50%,-50%) 居中；scale(1/r) 把 2× 画布缩回视觉大小 */
  transform: translate(-50%, -50%) scale(var(--3d-r-inv)) rotateX(-6deg) rotateY(-18deg);
  transform-origin: center center;
  animation: tarot-float 6s ease-in-out infinite;
  cursor: pointer;
  will-change: transform;
  /* 注意：background / box-shadow / backface-visibility / ::before / ::after
     全部搬到 .tarot-3d__face —— 父舞台不画视觉，才能让 flipper 翻转时
     四角/金框/底色一起翻。*/
}
.tarot-3d:hover .tarot-3d__face { filter: brightness(1.08); }

/* --------------------------------------------------------------
 * .tarot-3d__face —— 每一面都是"一整张完整的牌"
 * 正反两面各一份，翻转时整张牌（包括四角/金框/底色）一起翻。
 *
 * 布局 + 翻面控制（flex 居中、rotateY、transition）由 index.html 的
 * 本地 style 管（那是 hero 专属的行为层），这里只管"卡面外观的视觉骨架"。
 * -------------------------------------------------------------- */
.tarot-3d__face {
  border-radius: calc(18px * var(--3d-r));
  background:
    radial-gradient(ellipse at 50% 22%, rgba(232,216,176,0.45) 0%, transparent 55%),
    radial-gradient(circle at 50% 90%, rgba(197,163,88,0.18) 0%, transparent 60%),
    linear-gradient(140deg, #1A1D29 0%, #0E1018 60%, #060812 100%);
  box-shadow:
    inset 0 0 0 calc(1.5px * var(--3d-r)) rgba(197,163,88,0.55),
    /* 主阴影：alpha 0.55 → 0.28，牌背后的深色压感减半，整张牌提亮一档 */
    0 calc(34px * var(--3d-r)) calc(64px * var(--3d-r)) rgba(14,16,24,0.28),
    0 calc(14px * var(--3d-r)) calc(26px * var(--3d-r)) rgba(197,163,88,0.18),
    /* 外描边：alpha 0.5 → 0.22，silhouette 边缘不再发死黑 */
    0 0 0 calc(1px * var(--3d-r)) rgba(0,0,0,0.22);
  transition: filter 0.6s ease;
}

/* 双层金色内框（从 .tarot-3d 迁入；两面各一份） */
.tarot-3d__face::before {
  content: '';
  position: absolute;
  inset: calc(12px * var(--3d-r));
  border: calc(1px * var(--3d-r)) solid rgba(197,163,88,0.6);
  border-radius: calc(11px * var(--3d-r));
  pointer-events: none;
}
.tarot-3d__face::after {
  content: '';
  position: absolute;
  inset: calc(19px * var(--3d-r));
  border: calc(1px * var(--3d-r)) solid rgba(197,163,88,0.25);
  border-radius: calc(9px * var(--3d-r));
  pointer-events: none;
}

/* 中央大「鏡」徽章 */
.tarot-3d__emblem {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: calc(12px * var(--3d-r));
  text-align: center;
  padding: calc(34px * var(--3d-r)) calc(18px * var(--3d-r));
}
.tarot-3d__roman {
  font-family: "Cormorant Garamond", serif;
  font-size: calc(0.75rem * var(--3d-r));
  letter-spacing: 0.32em;
  color: rgba(232,216,176,0.75);
}
.tarot-3d__glyph {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: calc(clamp(72px, 9vw, 110px) * var(--3d-r));
  font-weight: 500;
  line-height: 0.9;
  background: linear-gradient(135deg, #F3E2AE 0%, #E8D293 30%, #C5A358 60%, #8a6b2a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 calc(2px * var(--3d-r)) calc(6px * var(--3d-r)) rgba(197,163,88,0.35));
}
.tarot-3d__title {
  font-family: "Cormorant Garamond", serif;
  font-size: calc(0.75rem * var(--3d-r));
  letter-spacing: 0.28em;
  color: rgba(232,216,176,0.85);
  text-transform: uppercase;
}
.tarot-3d__divider {
  width: calc(54px * var(--3d-r));
  height: calc(1px * var(--3d-r));
  background: linear-gradient(90deg, transparent 0%, rgba(197,163,88,0.7) 50%, transparent 100%);
}

/* 四角小星装饰 */
.tarot-3d__corner {
  position: absolute;
  width: calc(22px * var(--3d-r));
  height: calc(22px * var(--3d-r));
  color: rgba(197,163,88,0.55);
  background-color: currentColor;
  -webkit-mask: url("assets/ornaments/corner-flourish.svg") no-repeat center / contain;
          mask: url("assets/ornaments/corner-flourish.svg") no-repeat center / contain;
}
.tarot-3d__corner--tl { top: calc(8px * var(--3d-r));    left: calc(8px * var(--3d-r));    transform: rotate(180deg); }
.tarot-3d__corner--tr { top: calc(8px * var(--3d-r));    right: calc(8px * var(--3d-r)); }
.tarot-3d__corner--bl { bottom: calc(8px * var(--3d-r)); left: calc(8px * var(--3d-r));    transform: rotate(-90deg); }
.tarot-3d__corner--br { bottom: calc(8px * var(--3d-r)); right: calc(8px * var(--3d-r));   transform: rotate(90deg); }

/* 高光扫过（顶层反光层）*/
.tarot-3d__sheen {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(
    115deg,
    transparent 35%,
    rgba(255,255,255,0.14) 48%,
    rgba(255,255,255,0.04) 52%,
    transparent 65%
  );
  mix-blend-mode: screen;
  opacity: 0.8;
}

/* 悬浮在地面的椭圆阴影（绑在 wrap 上，沿用视觉坐标） */
.tarot-3d-wrap::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -44px;
  width: 78%;
  height: 36px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(14,16,24,0.38) 0%, rgba(14,16,24,0.12) 50%, transparent 75%);
  filter: blur(14px);
  animation: tarot-shadow 6s ease-in-out infinite;
  z-index: -1;
}

@keyframes tarot-float {
  0%, 100% { transform: translate(-50%, -50%) scale(var(--3d-r-inv)) rotateX(-6deg) rotateY(-18deg) translate3d(0, 0, 0); }
  50%      { transform: translate(-50%, -50%) scale(var(--3d-r-inv)) rotateX(-2deg) rotateY(-14deg) translate3d(0, calc(-18px * var(--3d-r)), 0); }
}
@keyframes tarot-shadow {
  0%, 100% { transform: translateX(-50%) scale(1);    opacity: 0.85; }
  50%      { transform: translateX(-50%) scale(0.82); opacity: 0.45; }
}

/* 环绕塔罗牌的 3 颗浮尘小星（纯装饰）*/
.tarot-3d-star {
  position: absolute;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--mystic);
  opacity: 0.6;
  animation: tarot-star 5s ease-in-out infinite;
  pointer-events: none;
  font-family: "Cormorant Garamond", serif;
  filter: drop-shadow(0 0 8px rgba(197,163,88,0.4));
}
.tarot-3d-star::before {
  content: '✦';
  line-height: 1;
}
.tarot-3d-star--1 { top: 10%; left: 12%;  font-size: 18px; animation-delay: 0s;   }
.tarot-3d-star--2 { top: 28%; right: 8%;  font-size: 22px; animation-delay: 1.8s; }
.tarot-3d-star--3 { bottom: 18%; left: 6%; font-size: 14px; animation-delay: 3.2s; }
@keyframes tarot-star {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.4; }
  50%      { transform: translateY(-12px) scale(1.25); opacity: 1; }
}

/* ==================================================================
 * 多卡舞台（tarot-stage）· 根据选中牌阵渲染 1/3/5 张 3D 塔罗牌
 *   - 每张 .tarot-3d-wrap 通过内联 CSS 变量定位：
 *       --pos-x  : 距舞台中心的水平偏移（px）
 *       --pos-y  : 距舞台中心的垂直偏移（px）
 *       --pos-rot: 2D 旋转角（deg）
 *       --pos-scale: 缩放系数
 *       --pos-z  : z-index 堆叠
 *       --pos-delay: 进入动画错位延迟
 * ================================================================== */
.tarot-stage {
  position: relative;
  width: 100%;
  height: 100%;
}
.tarot-stage .tarot-3d-wrap {
  position: absolute;
  left: 50%;
  top: 50%;
  --pos-x: 0px;
  --pos-y: 0px;
  --pos-rot: 0deg;
  --pos-scale: 1;
  --pos-z: 1;
  --pos-delay: 0ms;
  transform:
    translate(calc(-50% + var(--pos-x)), calc(-50% + var(--pos-y)))
    rotate(var(--pos-rot))
    scale(var(--pos-scale));
  z-index: var(--pos-z);
  transition:
    transform 0.9s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.5s ease;
  animation: tarot-stage-enter 0.8s cubic-bezier(0.22, 1, 0.36, 1) var(--pos-delay) both;
}

/* 入场：从下方淡入 */
@keyframes tarot-stage-enter {
  0% {
    opacity: 0;
    transform:
      translate(calc(-50% + var(--pos-x)), calc(-50% + var(--pos-y) + 40px))
      rotate(var(--pos-rot))
      scale(calc(var(--pos-scale) * 0.85));
  }
  100% {
    opacity: 1;
    /* 与 .tarot-stage .tarot-3d-wrap 的静态 transform 一致 */
    transform:
      translate(calc(-50% + var(--pos-x)), calc(-50% + var(--pos-y)))
      rotate(var(--pos-rot))
      scale(var(--pos-scale));
  }
}

/* 凯尔特十字阻碍牌：更高 z-index，避免被核心牌压住 */
.tarot-stage .tarot-3d-wrap[data-cross="1"] {
  --pos-z: 5;
}

/* 多卡时阴影更小更柔 */
.tarot-stage[data-spread="celtic-five"] .tarot-3d-wrap::after,
.tarot-stage[data-spread="three-card"] .tarot-3d-wrap::after,
.tarot-stage[data-spread="situation-action-outcome"] .tarot-3d-wrap::after,
.tarot-stage[data-spread="heart-mind-body"] .tarot-3d-wrap::after {
  width: 60%;
  height: 24px;
  bottom: -28px;
  opacity: 0.6;
}

/* reduced-motion：关掉入场动画和变形过渡 */
@media (prefers-reduced-motion: reduce) {
  .tarot-stage .tarot-3d-wrap {
    transition: none !important;
    animation: none !important;
  }
}

/* ==================================================================
 * Spread Tile · 牌阵选择卡片（#spread-grid 下每一张）
 *   - 进入：IntersectionObserver 加 .is-revealed 触发错位 transition
 *   - Hover：上浮 + 金色光晕 + 里面的 mini 牌阵张开
 *   - is-previewing：当前被 hero 预览中的牌阵，额外亮一圈金边
 * ================================================================== */
.spread-tile {
  opacity: 0;
  transform: translateY(24px);
  transition:
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    opacity   0.6s ease,
    box-shadow 0.3s ease,
    border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}
.spread-tile.is-revealed {
  opacity: 1;
  transform: translateY(0);
  transition-delay: calc(var(--i, 0) * 90ms);
}
.spread-tile.is-revealed:hover {
  transform: translateY(-6px);
  transition-delay: 0s;
  box-shadow:
    0 16px 38px rgba(197, 163, 88, 0.22),
    0 6px 14px rgba(14, 16, 24, 0.18);
}
.spread-tile.is-previewing {
  box-shadow:
    inset 0 0 0 1px rgba(197, 163, 88, 0.65),
    0 12px 30px rgba(197, 163, 88, 0.22),
    0 4px 10px rgba(14, 16, 24, 0.14);
}

/* 牌阵卡片里的 mini 3D 牌阵（替代原来的 emoji） */
.spread-mini-stack {
  width: 56px;
  height: 56px;
  position: relative;
  flex-shrink: 0;
  perspective: 300px;
}
.spread-mini-card {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 26px;
  --mini-x: 0px;
  --mini-y: 0px;
  --mini-rot: 0deg;
  --mini-scale: 1;
  transform:
    translate(calc(-50% + var(--mini-x)), calc(-50% + var(--mini-y)))
    rotate(var(--mini-rot))
    scale(var(--mini-scale));
  background: linear-gradient(140deg, #1A1D29 0%, #0E1018 60%, #060812 100%);
  border-radius: 2.5px;
  box-shadow:
    inset 0 0 0 0.5px rgba(197, 163, 88, 0.55),
    0 1px 3px rgba(14, 16, 24, 0.5),
    0 0 0 0.5px rgba(0, 0, 0, 0.4);
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}
/* 迷你卡片内双金框 */
.spread-mini-card::before {
  content: '';
  position: absolute;
  inset: 2px;
  border: 0.5px solid rgba(197, 163, 88, 0.4);
  border-radius: 1.5px;
  pointer-events: none;
}
.spread-mini-card::after {
  content: '✦';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(232, 216, 176, 0.6);
  font-size: 8px;
  line-height: 1;
  font-family: "Cormorant Garamond", serif;
}
/* 凯尔特阻碍牌在 mini 里也高一层 */
.spread-mini-card[data-cross="1"] { z-index: 2; }

/* Hover：mini 卡片按基础偏移向外 1.25 倍展开，并整体微放大 */
.spread-tile.is-revealed:hover .spread-mini-card {
  transform:
    translate(
      calc(-50% + var(--mini-x) * 1.25),
      calc(-50% + var(--mini-y) * 1.25)
    )
    rotate(calc(var(--mini-rot) * 1.15))
    scale(calc(var(--mini-scale) * 1.08));
}

/* reduced-motion：spread tile 直接显现，mini 不做 hover 位移 */
@media (prefers-reduced-motion: reduce) {
  .spread-tile {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .spread-mini-card {
    transition: none !important;
  }
  .spread-tile.is-revealed:hover .spread-mini-card {
    transform:
      translate(calc(-50% + var(--mini-x)), calc(-50% + var(--mini-y)))
      rotate(var(--mini-rot))
      scale(var(--mini-scale)) !important;
  }
}

/* ==================================================================
 * Shuffle Deck · 扇形逐张选牌（塔罗 step 3）
 *   - .shuffle-deck 容器（仅布局，不再是点击触发器）
 *   - .shuffle-card 扇形单张：hover 悬浮抬升、click 飞到 slot
 *   - .is-shuffling 容器态：全扇抖动重组
 *   - .shuffle-slots / .shuffle-slot N 个隐形占位
 *   - .card-flyer fixed-position 飞行克隆（pick 时动画用）
 *   - .reveal-card-wrap.is-landing 保留：落位错位淡入（flyer 最终交接给 tarot-card）
 * ================================================================== */
.shuffle-deck {
  position: relative;
  height: 12rem;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  border-radius: 14px;
}

.shuffle-card {
  position: absolute;
  width: 5rem;
  height: 8rem;
  border-radius: 12px;
  background:
    radial-gradient(circle at 50% 30%, rgba(232,216,176,0.3) 0%, transparent 55%),
    linear-gradient(135deg, #1A1D29, #0E1018);
  box-shadow:
    inset 0 0 0 1px rgba(197,163,88,0.4),
    0 8px 20px rgba(14,16,24,0.2);
  transform: translateX(var(--deck-x, 0px)) rotate(var(--deck-rot, 0deg));
  /* 漂浮：持续 4s 轻轻上下浮动；amplitude 稍大，更有灵性 */
  animation: shuffle-float 4s ease-in-out infinite;
  animation-delay: var(--deck-delay, 0s);
  transition: filter 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
  outline: none;
  will-change: transform;
}

/* 单张 hover：停漂浮、抬升 + 放大到「牌阵空位」尺寸（1.25×） + 金色阴影 */
.shuffle-card:hover,
.shuffle-card:focus-visible {
  animation: none;
  z-index: 3;
  transform:
    translateX(var(--deck-x, 0px))
    translateY(-14px)
    rotate(var(--deck-rot, 0deg))
    scale(1.25);
  box-shadow:
    inset 0 0 0 1px rgba(232,216,176,0.75),
    0 22px 38px rgba(14,16,24,0.34),
    0 0 0 2px rgba(197,163,88,0.5);
  filter: brightness(1.1);
}

/* 已挑出：停止漂浮、原地淡出——下落由 .card-flyer 接管，视觉上只有一次向下滑入 */
.shuffle-card.is-picked {
  pointer-events: none;
  animation: none;
  opacity: 0;
  transform: translateX(var(--deck-x, 0px)) rotate(var(--deck-rot, 0deg));
  transition: opacity 0.35s ease 0.05s;
}

@keyframes shuffle-float {
  0%, 100% {
    transform: translateX(var(--deck-x, 0px)) translateY(0) rotate(var(--deck-rot, 0deg));
  }
  50% {
    transform: translateX(var(--deck-x, 0px)) translateY(-8px) rotate(var(--deck-rot, 0deg));
  }
}

/* 洗牌动画：整副扇牌随机跳动 + 微重排 */
.shuffle-deck.is-shuffling .shuffle-card {
  animation: shuffle-jiggle 0.85s cubic-bezier(0.22, 1, 0.36, 1) var(--deck-delay-mini, 0s) both;
}
.shuffle-deck.is-shuffling .shuffle-card {
  pointer-events: none;
}
@keyframes shuffle-jiggle {
  0% {
    transform: translateX(var(--deck-x, 0px)) rotate(var(--deck-rot, 0deg));
  }
  25% {
    transform:
      translateX(calc(var(--deck-x, 0px) + 24px))
      translateY(-28px)
      rotate(calc(var(--deck-rot, 0deg) - 32deg));
  }
  55% {
    transform:
      translateX(calc(var(--deck-x, 0px) - 18px))
      translateY(18px)
      rotate(calc(var(--deck-rot, 0deg) + 22deg));
  }
  80% {
    transform:
      translateX(calc(var(--deck-x, 0px) + 6px))
      translateY(-4px)
      rotate(calc(var(--deck-rot, 0deg) - 6deg));
  }
  100% {
    transform: translateX(var(--deck-x, 0px)) rotate(var(--deck-rot, 0deg));
  }
}

/* Flyer：pick 时从扇形克隆出来的飞行副本，fixed 定位逃离布局 */
.card-flyer {
  position: fixed;
  margin: 0;
  pointer-events: none;
  z-index: 9999;
  transition:
    transform 0.85s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.85s ease;
  animation: none;
  will-change: transform, opacity;
  transform: translate(0, 0) scale(1);
  transform-origin: center center;
}

/* 抽牌/挑牌提示 */
.shuffle-hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: #8a6c32;
  background: rgba(197,163,88,0.08);
  box-shadow: inset 0 0 0 1px rgba(197,163,88,0.28);
  letter-spacing: 0.04em;
}
.shuffle-hint__glyph { color: rgba(197,163,88,0.85); }
.shuffle-hint__count {
  font-weight: 700;
  color: #6b5424;
  padding: 0 4px;
}
.shuffle-hint__progress {
  color: #8a6c32;
  opacity: 0.85;
  margin-left: 4px;
}

/* ========= Slots：隐形占位 + 落牌后显形 ========= */
/* 统一尺寸：牌阵空位固定为「正常塔罗牌的 1.25 倍」——即浮动/hover 尺寸。
   所以 frame = 6.25rem × 10rem（shuffle-card 5×8 × 1.25）。
   多张时横向 flex 排布，wrap 并居中。 */
.shuffle-slots {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
  gap: 1.25rem 1.5rem;
  max-width: 640px;
  margin: 0 auto;
}
@media (max-width: 520px) {
  .shuffle-slots { gap: 1rem; }
}
.shuffle-slot {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 8px 6px;
  border-radius: 14px;
  transition: background-color 0.3s ease;
  /* 让 slot 宽度跟随 frame 自身，保持统一 */
  width: 6.25rem;
  flex: 0 0 auto;
}
.shuffle-slot__label {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mystic);
  font-weight: 500;
  opacity: 0.65;
  transition: opacity 0.3s ease;
  text-transform: uppercase;
  text-align: center;
}
.shuffle-slot__hint {
  font-size: 11px;
  color: var(--ink-mute);
  text-align: center;
  min-height: 1rem;
  opacity: 0.55;
  transition: opacity 0.3s ease;
  line-height: 1.35;
}
.shuffle-slot__frame {
  position: relative;
  width: 6.25rem;
  height: 10rem;
  border-radius: 0.9rem;
  border: 1.5px dashed rgba(197,163,88,0.25);
  background: rgba(197,163,88,0.04);
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    border-color 0.3s ease,
    background-color 0.3s ease,
    box-shadow 0.3s ease;
}
.shuffle-slot__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(197,163,88,0.35);
  font-size: 20px;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.shuffle-slot.is-filled .shuffle-slot__label,
.shuffle-slot.is-filled .shuffle-slot__hint {
  opacity: 1;
}
.shuffle-slot.is-filled .shuffle-slot__frame {
  border-color: transparent;
  background: transparent;
}
.shuffle-slot.is-filled .shuffle-slot__placeholder {
  opacity: 0;
}
.shuffle-slot .tarot-card {
  width: 100%;
  height: 100%;
  /* 统一空位尺寸（6.25×10rem = 5:8），覆盖默认的 2:3.5 aspect-ratio */
  aspect-ratio: auto;
  border-radius: 0.9rem;
  /* 不给 .tarot-card 自身加 transform 动画，否则会压制 .flipped 的 rotateY(180deg) */
  animation: tarot-slot-fade 0.35s ease both;
}
.shuffle-slot .tarot-card__inner,
.shuffle-slot .tarot-card-face {
  border-radius: 0.9rem;
}
@keyframes tarot-slot-fade {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* 卡下方标签：翻牌前仅提示「点击翻开」；翻牌后统一标注正位/逆位 + 关键词 */
.slot-caption {
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: 100%;
  text-align: center;
  min-height: 2.5rem;
}
.slot-caption__hint {
  font-size: 11px;
  color: var(--ink-mute);
  letter-spacing: 0.05em;
  opacity: 0.85;
  transition: opacity 0.3s ease;
}
.slot-caption.is-revealed .slot-caption__hint {
  display: none;
}
.slot-caption__name-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  line-height: 1.2;
}
.slot-caption__name {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-deep, var(--ink));
  letter-spacing: 0.02em;
}
.slot-caption__orient {
  display: inline-block;
  font-size: 10.5px;
  letter-spacing: 0.12em;
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: 500;
  background: rgba(124,109,168,0.10);
  color: var(--mystic, #7c6da8);
  text-transform: none;
}
.slot-caption__orient--reversed {
  background: rgba(200, 138, 46, 0.12);
  color: #a0691c;
}
.slot-caption__kw {
  font-size: 11.5px;
  color: var(--ink-deep, var(--ink));
  line-height: 1.4;
  font-weight: 500;
  letter-spacing: 0.02em;
  max-width: 100%;
  word-break: keep-all;
}
@keyframes slot-caption-fade {
  from { opacity: 0; transform: translateY(-2px); }
  to   { opacity: 1; transform: translateY(0); }
}
.slot-caption.is-revealed .slot-caption__orient,
.slot-caption.is-revealed .slot-caption__kw {
  animation: slot-caption-fade 0.32s ease both;
}

/* 解读区下方：每张牌的详细解读集合 */
.reading-cards-detail {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  animation: reading-cards-detail-fade 0.4s ease both;
}
@keyframes reading-cards-detail-fade {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.reading-cards-detail__divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.25rem 0 0.5rem;
}
.reading-cards-detail__divider-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(197,163,88,0.4), transparent);
}
.reading-cards-detail__divider-text {
  font-size: 12.5px;
  letter-spacing: 0.15em;
  color: var(--ink-mute, #8b7f6e);
  white-space: nowrap;
}
.reading-cards-detail__note {
  margin-top: 0.25rem;
  padding-top: 0.4rem;
  border-top: 1px dashed rgba(197,163,88,0.2);
  font-size: 11.5px;
  color: var(--ink-mute);
  text-align: right;
}

/* 单张牌的详细解读块（牌意/事业/感情/学业） */
.reading-card-detail {
  padding: 0.95rem 1.05rem;
  background: rgba(252, 249, 241, 0.55);
  border: 1px solid rgba(197,163,88,0.22);
  border-radius: 0.85rem;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
  text-align: left;
  box-shadow: 0 1px 2px rgba(60, 45, 20, 0.03);
}
.reading-card-detail__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 0.5rem;
  margin-bottom: 0.7rem;
  border-bottom: 1px dashed rgba(197,163,88,0.3);
}
.reading-card-detail__pos {
  font-size: 11.5px;
  color: var(--ink-mute, #8b7f6e);
  padding: 1px 7px;
  border-radius: 4px;
  background: rgba(139,127,110,0.09);
  letter-spacing: 0.04em;
}
.reading-card-detail__emoji {
  font-size: 16px;
  line-height: 1;
}
.reading-card-detail__name {
  font-weight: 600;
  color: var(--ink-deep);
  font-size: 15px;
  letter-spacing: 0.02em;
}
.reading-card-detail__orient {
  font-size: 11.5px;
  color: var(--mystic, #7c6da8);
  padding: 1px 7px;
  border-radius: 4px;
  background: rgba(124,109,168,0.10);
}
.reading-card-detail__section {
  margin-bottom: 0.65rem;
}
.reading-card-detail__section:last-of-type {
  margin-bottom: 0.15rem;
}
.reading-card-detail__label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-weight: 600;
  color: var(--ink-deep);
  font-size: 13px;
  margin-bottom: 0.2rem;
}
.reading-card-detail__icon {
  font-size: 14px;
  line-height: 1;
}
.reading-card-detail__body {
  color: var(--ink-soft, var(--ink));
  font-size: 13.5px;
  padding-left: 0.1rem;
}

@media (prefers-reduced-motion: reduce) {
  .reading-cards-detail { animation: none !important; }
}

/* Reveal 进场（旧版 reveal-stage 已不使用，但保留供 flyer 之外的场景） */
.reveal-card-wrap.is-landing {
  animation: tarot-land 0.75s cubic-bezier(0.22, 1, 0.36, 1) var(--land-delay, 0s) both;
}
@keyframes tarot-land {
  0% {
    opacity: 0;
    transform: translateY(-32px) scale(0.86);
  }
  60% {
    opacity: 1;
    transform: translateY(4px) scale(1.02);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .shuffle-deck, .shuffle-card {
    animation: none !important;
    transition: none !important;
  }
  .shuffle-card:hover,
  .shuffle-card:focus-visible {
    transform: translateX(var(--deck-x, 0px)) rotate(var(--deck-rot, 0deg));
  }
  .shuffle-deck.is-shuffling .shuffle-card {
    animation: none !important;
  }
  .card-flyer {
    transition: none !important;
    animation: none !important;
  }
  .shuffle-slot .tarot-card {
    animation: none !important;
  }
  .slot-caption.is-revealed .slot-caption__orient,
  .slot-caption.is-revealed .slot-caption__kw {
    animation: none !important;
  }
  .reveal-card-wrap.is-landing {
    animation: none !important;
    opacity: 1;
    transform: none;
  }
}

/* ==================================================================
 * 3D Book（打开的测试手札 · 双页 + 书脊 + 悬浮）
 * 结构：
 *   .book-3d-wrap
 *     .book-3d (倾斜容器)
 *       .book-3d__pages (底层书页厚度)
 *       .book-3d__cover--left  (左硬封，翻开露内侧)
 *       .book-3d__cover--right (右硬封)
 *       .book-3d__page--left   (左内页文字)
 *       .book-3d__page--right  (右内页文字)
 *       .book-3d__spine        (中线)
 *       .book-3d__ribbon       (书签带)
 * ================================================================== */
.book-3d-wrap {
  position: relative;
  display: inline-block;
  /* 更紧凑：一行 4 本时本身更小，给 caption 留足下方空间 */
  width: clamp(180px, 18vw, 240px);
  height: clamp(120px, 12vw, 160px);
  transform-style: preserve-3d;
  cursor: pointer;

  /* —— 皮肤变量：单本书的调色板全在这里落脚 —— */
  /* 书本硬封（body）顶 → 底 */
  --book-cover-start: #1A1D29;
  --book-cover-end:   #0E1018;
  /* 内页（pages）顶 → 底 */
  --book-paper-start: #FDFBF3;
  --book-paper-end:   #F4EEDC;
  /* 书脊金线 */
  --book-spine:       rgba(197,163,88,0.8);
  /* 书签带（ribbon）顶 → 底 */
  --book-ribbon-start: #B5483D;
  --book-ribbon-end:   #8E342C;
  /* 小标题 / 大字 / 子弹点的主色 */
  --book-accent:      #C5A358;
  /* accent-soft/weak 从 --book-accent 自动派生 —— 每个 preset 换 accent 时，柔光/分隔线会自动跟随 */
  --book-accent-soft: color-mix(in srgb, var(--book-accent) 45%, transparent);
  --book-accent-weak: color-mix(in srgb, var(--book-accent) 25%, transparent);
  /* 大字渐变（居左页中央） */
  --book-bigchar-grad: linear-gradient(135deg, #C5A358 0%, #8a6b2a 100%);
  /* 墨色正文（书页正文色，quiz-book 与 book-open 共享） */
  --book-ink:         #2F2417;
  /* 倾斜方向（rotateZ）——默认 -14deg，可以被 .book-3d-wrap--tilt-right 覆盖 */
  --book-tilt: -14deg;
  --book-tilt-hover: -12deg;
}

.book-3d {
  position: absolute;
  left: 50%;
  top: 50%;
  /* 与 .book-3d-wrap 同源尺寸 */
  width: calc(clamp(180px, 18vw, 240px) * var(--3d-r));
  height: calc(clamp(120px, 12vw, 160px) * var(--3d-r));
  transform-style: preserve-3d;
  transform: translate(-50%, -50%) scale(var(--3d-r-inv)) rotateX(52deg) rotateZ(var(--book-tilt));
  transform-origin: center center;
  animation: book-float 7s ease-in-out infinite;
  transition: filter 0.5s ease;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  will-change: transform;
}
.book-3d-wrap:hover .book-3d { filter: brightness(1.05); }

/* 倾斜变体：书架陈列时左右错落，打破整齐划一的机械感。
   注意：把 `.book-3d-wrap--tilt-right .book-3d__ribbon` 的覆盖放到
   `.book-3d__ribbon` 规则之后，否则会影响级联与基于正则的 CSS 审计。 */
.book-3d-wrap--tilt-right {
  --book-tilt: 14deg;
  --book-tilt-hover: 12deg;
}

/* 底层书本（厚硬封 + 两侧延伸表示书脊 & 外沿）*/
.book-3d__body {
  position: absolute;
  top: calc(-10px * var(--3d-r));
  left: calc(-14px * var(--3d-r));
  right: calc(-14px * var(--3d-r));
  bottom: calc(-10px * var(--3d-r));
  background:
    linear-gradient(180deg, var(--book-cover-start) 0%, var(--book-cover-end) 100%);
  border-radius: calc(10px * var(--3d-r));
  box-shadow:
    inset 0 0 0 calc(1.5px * var(--3d-r)) var(--book-accent-soft),
    0 calc(8px * var(--3d-r)) calc(18px * var(--3d-r)) rgba(14,16,24,0.28);
  transform: translateZ(calc(-12px * var(--3d-r)));
}

/* 书本页叠厚度（沿四条边模拟纸张层）*/
.book-3d__body::before,
.book-3d__body::after {
  content: '';
  position: absolute;
  left: calc(14px * var(--3d-r));
  right: calc(14px * var(--3d-r));
  height: calc(10px * var(--3d-r));
  background: repeating-linear-gradient(
    to right,
    rgba(200,185,145,0.55) 0,
    rgba(200,185,145,0.55) calc(1px * var(--3d-r)),
    #F5EFDF calc(1px * var(--3d-r)),
    #F5EFDF calc(3px * var(--3d-r))
  );
  box-shadow: inset 0 0 0 calc(1px * var(--3d-r)) rgba(14,16,24,0.15);
}
.book-3d__body::before { top:    calc(10px * var(--3d-r)); }
.book-3d__body::after  { bottom: calc(10px * var(--3d-r)); }

/* 内侧纸页（展开的两面） */
.book-3d__page {
  position: absolute;
  top: calc(4px * var(--3d-r));
  width: 50%;
  height: calc(100% - (8px * var(--3d-r)));
  background: linear-gradient(180deg, var(--book-paper-start) 0%, var(--book-paper-end) 100%);
  box-shadow:
    inset 0 0 0 calc(1px * var(--3d-r)) var(--book-accent-weak);
  /* 紧凑版：padding 收窄，给有限的 150-200px 高度留出更多内容区 */
  padding: calc(12px * var(--3d-r)) calc(14px * var(--3d-r));
  color: #3A3F4E;
  font-size: calc(0.7rem * var(--3d-r));
  overflow: hidden;
}
.book-3d__page--left {
  left: 0;
  border-radius: calc(4px * var(--3d-r)) 0 0 calc(4px * var(--3d-r));
  transform: translateZ(0);
  text-align: center;
}
.book-3d__page--right {
  right: 0;
  border-radius: 0 calc(4px * var(--3d-r)) calc(4px * var(--3d-r)) 0;
  transform: translateZ(0);
}

/* 中央书脊装饰 */
.book-3d__spine {
  position: absolute;
  left: 50%;
  top: calc(6px * var(--3d-r));
  bottom: calc(6px * var(--3d-r));
  width: calc(2px * var(--3d-r));
  transform: translateX(-50%);
  background: linear-gradient(180deg,
    transparent 0%,
    var(--book-spine) 50%,
    transparent 100%);
  box-shadow: 0 0 calc(6px * var(--3d-r)) var(--book-accent-soft);
}

/* 书签（丝带）*/
.book-3d__ribbon {
  position: absolute;
  top: calc(-8px * var(--3d-r));
  right: 42%;
  width: calc(16px * var(--3d-r));
  height: 70%;
  background: linear-gradient(180deg, var(--book-ribbon-start) 0%, var(--book-ribbon-end) 100%);
  border-radius: 0 0 calc(4px * var(--3d-r)) calc(4px * var(--3d-r));
  box-shadow: calc(2px * var(--3d-r)) 0 calc(6px * var(--3d-r)) rgba(0,0,0,0.12);
  transform: translateZ(calc(4px * var(--3d-r)));
}
.book-3d__ribbon::after {
  content: '';
  position: absolute;
  left: 0; right: 0;
  bottom: calc(-10px * var(--3d-r));
  height: calc(10px * var(--3d-r));
  background:
    linear-gradient(135deg, var(--book-ribbon-start) 50%, transparent 50%)  0                        0 / calc(8px * var(--3d-r)) calc(10px * var(--3d-r)),
    linear-gradient(-135deg, var(--book-ribbon-start) 50%, transparent 50%) calc(8px * var(--3d-r)) 0 / calc(8px * var(--3d-r)) calc(10px * var(--3d-r));
  background-repeat: no-repeat;
}

/* 倾斜变体下书签从「上方右侧」换到「上方左侧」——视觉跟着倾斜方向走 */
.book-3d-wrap--tilt-right .book-3d__ribbon {
  right: auto;
  left: 42%;
}

/* ─── Cover overlay ──────────────────────────────────────────────────
   .book-3d__cover 是盖在整本书上面的硬封皮；默认 rotateY(0) 完全遮住
   内页（读者看到的就是一本「合着的书」）。wrap:hover 时绕 left 轴
   旋转 -158° 打开，露出下面的双页内页 —— 模拟"把书翻开"。

   · 轴心：left center（沿书脊）
   · 终态：-158°（不打到 -180 避开完全背向导致 backface 闪烁）
   · 过渡：0.72s 的弹性曲线，与 .quiz-book__leaf 同源
   · backface-visibility: hidden → 打开后 cover 自己不再可见，不挡内页
 */
.book-3d__cover {
  position: absolute;
  inset: calc(4px * var(--3d-r));
  border-radius: calc(4px * var(--3d-r));
  background:
    /* 顶部微光 */
    radial-gradient(120% 45% at 50% 0%, rgba(255,255,255,0.08) 0%, transparent 60%),
    linear-gradient(140deg, var(--book-cover-start) 0%, var(--book-cover-end) 100%);
  box-shadow:
    inset 0 0 0 calc(1.5px * var(--3d-r)) var(--book-accent-soft),
    inset 0 0 0 calc(4px * var(--3d-r)) rgba(0,0,0,0.0),
    0 calc(6px * var(--3d-r)) calc(14px * var(--3d-r)) rgba(14,16,24,0.22);
  color: #F5EFE2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: calc(14px * var(--3d-r)) calc(20px * var(--3d-r));
  transform-origin: left center;
  transform: rotateY(0deg);
  transition: transform 0.72s cubic-bezier(.32, .02, .25, 1);
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  z-index: 3;
  will-change: transform;
  /* 书脊侧的微微凹陷 */
  /* stylelint-disable-next-line */
}
.book-3d__cover::before {
  /* 内沿压印 */
  content: '';
  position: absolute;
  inset: calc(10px * var(--3d-r));
  border: calc(1px * var(--3d-r)) solid var(--book-accent-weak);
  border-radius: calc(2px * var(--3d-r));
  pointer-events: none;
}
.book-3d-wrap:hover .book-3d__cover,
.book-3d-wrap:focus-within .book-3d__cover {
  transform: rotateY(-158deg);
}

/* Cover 内部排版：big-char 居中 + title 小字 */
.book-3d__cover-volume {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 600;
  color: var(--book-accent);
  letter-spacing: 0.22em;
  font-size: calc(0.58rem * var(--3d-r));
  text-transform: uppercase;
  text-align: center;
  margin-bottom: calc(6px * var(--3d-r));
}
.book-3d__cover-bigchar {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 500;
  font-size: calc(clamp(32px, 3vw, 46px) * var(--3d-r));
  line-height: 0.9;
  background: var(--book-bigchar-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: calc(4px * var(--3d-r));
}
.book-3d__cover-title {
  font-family: "Cormorant Garamond", serif;
  font-size: calc(0.72rem * var(--3d-r));
  letter-spacing: 0.18em;
  color: var(--book-accent);
  text-transform: uppercase;
  text-align: center;
  opacity: 0.9;
}
.book-3d__cover-rule {
  height: calc(1px * var(--3d-r));
  width: 50%;
  margin: calc(6px * var(--3d-r)) auto;
  background: linear-gradient(90deg, transparent 0%, var(--book-accent-soft) 50%, transparent 100%);
}

/* 在 reduced-motion 或极小屏：干脆隐藏 cover，直接展示内页（无动画） */
@media (prefers-reduced-motion: reduce) {
  .book-3d__cover { display: none; }
}

/* 页面排版（Calibre 风） */
.book-3d__head {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 600;
  color: var(--book-accent);
  letter-spacing: 0.22em;
  font-size: calc(0.625rem * var(--3d-r));
  text-transform: uppercase;
  text-align: center;
  margin-bottom: calc(6px * var(--3d-r));
}
.book-3d__big-char {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 500;
  /* 紧凑版书本：大字缩到 ~40-50px 视觉（以前 54-84） */
  font-size: calc(clamp(36px, 3.4vw, 50px) * var(--3d-r));
  line-height: 0.9;
  background: var(--book-bigchar-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: calc(6px * var(--3d-r)) 0 calc(3px * var(--3d-r));
}
.book-3d__title-lg {
  font-family: "Cormorant Garamond", serif;
  font-size: calc(0.95rem * var(--3d-r));
  letter-spacing: 0.18em;
  color: #5e5137;
  text-transform: uppercase;
}
.book-3d__list {
  margin-top: calc(6px * var(--3d-r));
  display: flex;
  flex-direction: column;
  gap: calc(5px * var(--3d-r));
}
.book-3d__list-item {
  display: flex;
  align-items: center;
  gap: calc(6px * var(--3d-r));
  font-size: calc(0.75rem * var(--3d-r));
  color: #4a4537;
}
.book-3d__list-item::before {
  content: '';
  display: inline-block;
  width: calc(4px * var(--3d-r));
  height: calc(4px * var(--3d-r));
  border-radius: 50%;
  background: var(--book-accent);
}
.book-3d__rule {
  height: calc(1px * var(--3d-r));
  width: 60%;
  margin: calc(6px * var(--3d-r)) auto;
  background: linear-gradient(90deg, transparent 0%, var(--book-accent-soft) 50%, transparent 100%);
}

/* 横线纸效果（作为左页背景肌理） */
.book-3d__page--left::before {
  content: '';
  position: absolute;
  left: 14%;
  right: 14%;
  top: 62%;
  bottom: 8%;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(10px * var(--3d-r)),
    var(--book-accent-weak) calc(10px * var(--3d-r)),
    var(--book-accent-weak) calc(11px * var(--3d-r))
  );
}

/* 书本地面阴影（绑在 wrap，沿用视觉坐标） */
.book-3d-wrap::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -56px;
  width: 78%;
  height: 38px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, rgba(14,16,24,0.35) 0%, rgba(14,16,24,0.1) 55%, transparent 80%);
  filter: blur(16px);
  animation: book-shadow 7s ease-in-out infinite;
  z-index: -1;
}

@keyframes book-float {
  0%, 100% { transform: translate(-50%, -50%) scale(var(--3d-r-inv)) rotateX(52deg) rotateZ(var(--book-tilt)) translate3d(0, 0, 0); }
  50%      { transform: translate(-50%, -50%) scale(var(--3d-r-inv)) rotateX(49deg) rotateZ(var(--book-tilt-hover)) translate3d(0, calc(-22px * var(--3d-r)), 0); }
}
@keyframes book-shadow {
  0%, 100% { transform: translateX(-50%) scale(1);    opacity: 0.8; }
  50%      { transform: translateX(-50%) scale(0.85); opacity: 0.45; }
}

/* ==================================================================
 * Bookshelf（测试库陈列：2~3 本书一排，左右错落）
 * ================================================================== */
.bookshelf {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px 20px;
  justify-items: center;
  padding: 40px 0 28px;
}
@media (min-width: 640px) {
  /* 一行 2 本：每本书有更多呼吸空间，摊开时也不挤 */
  .bookshelf {
    grid-template-columns: repeat(2, 1fr);
    gap: 72px 32px;
  }
}
@media (min-width: 1200px) {
  .bookshelf {
    gap: 88px 48px;
  }
}

/* 每一本书的「档位」容器：在书架上占一格，书本自身悬浮 */
.bookshelf__slot {
  position: relative;
  width: 100%;
  max-width: 260px;
  /* flex-column：书本在上，caption 在下（独立空间，不再 absolute 挤在书底下） */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 20px;
  text-decoration: none;
  color: inherit;
  outline: none;
}

/* 专门包一层，保证 book-3d-wrap 的 3D 倾斜有稳定的 flex 基准盒 */
.bookshelf__slot .book-3d-wrap {
  flex-shrink: 0;
}
.bookshelf__slot:focus-visible .book-3d {
  filter: brightness(1.15) drop-shadow(0 0 12px var(--book-accent-soft));
}

/* 书本下面的说明（书名 + 题量） —— 作为 flex-column 的独立项，不再 absolute */
.bookshelf__caption {
  width: 100%;
  text-align: center;
}
.bookshelf__caption-title {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink-deep, var(--ink));
  letter-spacing: 0.02em;
  margin-bottom: 2px;
  /* 长名截断，避免密集网格里 caption 撞格 */
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.bookshelf__caption-meta {
  font-size: 0.7rem;
  color: rgba(14,16,24,0.55);
  letter-spacing: 0.06em;
}
.bookshelf__caption-meta > span + span::before {
  content: '·';
  margin: 0 6px;
  color: rgba(14,16,24,0.3);
}

/* ==================================================================
 * Quiz Book（统一手札 · intro 封面 + 答题书页 + 封底 同一本书）
 * ------------------------------------------------------------------
 * 物理模型：1 封底 + 40 白页 + 1 封面 + 独立落地阴影
 *
 * 结构：
 *   .quiz-book-stage                  ← perspective 舞台容器
 *     .quiz-book                       ← 调色板 + preserve-3d + 平移动画
 *       .quiz-book__shadow             ← 独立落地椭圆（不参与 3D）
 *       .quiz-book__stage              ← 3D 层舞台（preserve-3d）
 *         .quiz-book__back-cover       ← 封底（右半，z=1）
 *         .quiz-book__leaf × 40        ← 白页（右半 stack，top 先翻）
 *           .quiz-book__leaf-face--front / --back
 *         .quiz-book__left-overlay     ← meta 浮层（打开后显现）
 *         .quiz-book__right-overlay    ← 当前题内容（翻页时淡入）
 *         .quiz-book__spine-line       ← 中央金线
 *         .quiz-book__ribbon           ← 书签带
 *         .quiz-book__front-cover      ← 封面（右半，z=5000 / 翻开后 z=10）
 *           .quiz-book__front-cover-face--front  ← 正面（读 .quiz-cover__*）
 *           .quiz-book__front-cover-face--back   ← 翻开后内侧（纸色）
 *
 * 翻页动作（两段式）：
 *   Fan  ： rotateY 0 → -72°（340ms，均匀缓动）— 纸张"扇起"
 *   Drop ： rotateY -72° → -180°（420ms，cubic-bezier(0.55,0,0.4,1)）— "落下"
 *
 * 每次翻页：右 overlay 旧内容立即删 → leaf 做 Fan+Drop → 中段注入新题淡入。
 * 打开封面：同一套 Fan+Drop，同时 .quiz-book 从 translateX(-25%) → 0
 *           让合拢态视觉居中、打开后铺满双页宽。
 * 调色板：统一 --book-* 唯一一套命名空间（与 library.html 书架同源）。
 *         inline style 从 Engine.getTestHeroMeta(test).palette 注入。
 * ================================================================== */

.quiz-book-stage {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 720px;
  padding: 56px 16px 80px;
  perspective: 2400px;
  perspective-origin: 50% 40%;
  transition: opacity 450ms ease;
}

.quiz-book {
  /* —— 皮肤变量（被 inline style 覆盖） —— */
  /* 使用与 library.html 书架 .book-3d-wrap 完全一致的 --book-* 默认值 */
  --book-cover-start: #1A1D29;
  --book-cover-end:   #0E1018;
  --book-paper-start: #FDFBF3;
  --book-paper-end:   #F4EEDC;
  --book-spine:       rgba(197,163,88,0.8);
  --book-ribbon-start: #B5483D;
  --book-ribbon-end:   #8E342C;
  --book-accent:      #C5A358;
  /* 同 .book-3d-wrap：accent-soft/weak 从 accent 派生，跟随 preset 主色 */
  --book-accent-soft: color-mix(in srgb, var(--book-accent) 45%, transparent);
  --book-accent-weak: color-mix(in srgb, var(--book-accent) 25%, transparent);
  --book-bigchar-grad: linear-gradient(135deg, #C5A358 0%, #8a6b2a 100%);
  --book-ink:         #2F2417;

  /* —— 几何（非 palette） —— */
  --qb-w: min(960px, 96vw);
  --qb-h: 620px;

  position: relative;
  width: var(--qb-w);
  height: var(--qb-h);
  transform-style: preserve-3d;
  /* 合拢态：stage 左移半页（25% of 960 = 240px），让可见的右半封面居中 */
  transform: translateX(-25%);
  transition: transform 760ms cubic-bezier(0.55, 0, 0.4, 1);
}
.quiz-book.is-open {
  transform: translateX(0);
}

/* —— 独立落地阴影（不参与 3D 翻转） —— */
.quiz-book__shadow {
  position: absolute;
  left: 50%;
  bottom: -34px;
  width: 50%;
  height: 38px;
  background: radial-gradient(ellipse at 50% 50%,
    rgba(14,16,24,0.32) 0%,
    rgba(14,16,24,0.18) 38%,
    rgba(14,16,24,0.05) 70%,
    transparent 100%);
  filter: blur(8px);
  pointer-events: none;
  transition: left 760ms cubic-bezier(0.55, 0, 0.4, 1),
              width 760ms cubic-bezier(0.55, 0, 0.4, 1),
              opacity 600ms ease,
              transform 600ms ease;
  z-index: 0;
}
.quiz-book.is-open .quiz-book__shadow {
  left: 3%;
  width: 94%;
}
.quiz-book.is-turning .quiz-book__shadow {
  transform: scaleX(1.02);
  opacity: 0.88;
}

/* —— 3D 舞台 —— */
.quiz-book__stage {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  z-index: 1;
}

/* —— 封底（右半，z=1 永远底层）—— */
.quiz-book__back-cover {
  position: absolute;
  top: 0; left: 50%;
  width: 50%; height: 100%;
  border-radius: 0 14px 14px 0;
  background:
    radial-gradient(120% 45% at 50% 0%, rgba(255,255,255,0.04) 0%, transparent 60%),
    linear-gradient(140deg, var(--book-cover-start) 0%, var(--book-cover-end) 100%);
  box-shadow:
    inset 0 0 0 1.5px var(--book-accent-soft),
    0 30px 60px -20px rgba(14,16,24,0.4);
  z-index: 1;
  pointer-events: none;
}

/* —— 左页排版 —— */
.qb-volume {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 600;
  color: var(--book-accent);
  letter-spacing: 0.22em;
  font-size: 0.7rem;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.qb-big-char {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 500;
  font-size: clamp(76px, 9vw, 120px);
  line-height: 0.9;
  background: var(--book-bigchar-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 4px 0;
}
.qb-title {
  font-family: "Cormorant Garamond", serif;
  font-size: 1rem;
  letter-spacing: 0.22em;
  color: #5e5137;
  text-transform: uppercase;
  margin: 4px 0 2px;
}
.qb-sub {
  font-family: "Noto Serif SC", serif;
  font-size: 0.8125rem;
  color: rgba(47,36,23,0.7);
}
.qb-rule {
  height: 1px;
  width: 60%;
  margin: 18px auto 14px;
  background: linear-gradient(90deg, transparent 0%, var(--book-accent-soft) 50%, transparent 100%);
}
.qb-progress { width: 100%; margin-top: 6px; }
.qb-progress-counter {
  font-family: "Cormorant Garamond", serif;
  font-size: 1.75rem;
  font-weight: 500;
  color: var(--book-ink);
  letter-spacing: 0.1em;
}
.qb-progress-counter .qb-total { color: rgba(47,36,23,0.38); }
.qb-progress-bar {
  margin: 10px auto 0;
  height: 3px;
  width: 72%;
  background: var(--book-accent-weak);
  border-radius: 2px;
  overflow: hidden;
}
.qb-progress-bar__fill {
  height: 100%;
  background: var(--book-accent);
  transition: width 0.5s cubic-bezier(.4,0,.2,1);
}
.qb-dim {
  margin-top: 18px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: rgba(47,36,23,0.6);
  text-transform: uppercase;
}
.qb-prev {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--book-accent);
  background: transparent;
  border: 1px solid var(--book-accent-soft);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
  cursor: pointer;
  font-family: inherit;
}
.qb-prev:hover:not([disabled]) {
  background: var(--book-accent);
  color: var(--book-paper-start);
  border-color: var(--book-accent);
}
.qb-prev[disabled] {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

/* —— 浮层版 prev 按钮：脱离 3D 栈，挂在 .quiz-book 底部左侧，始终可点击 —— */
.qb-prev--floating {
  position: absolute;
  left: 6%;
  bottom: 22px;
  margin-top: 0;
  z-index: 6000;
  background: rgba(255,253,245,0.72);
  backdrop-filter: blur(6px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 360ms ease, background 0.2s, color 0.2s, border-color 0.2s;
}
.quiz-book.is-open .qb-prev--floating {
  opacity: 1;
  pointer-events: auto;
}
.qb-prev--floating[disabled] {
  opacity: 0.3;
  pointer-events: none;
}

/* ==================================================================
 * 白页 leaf（40 层）——
 *   · inline 设置 --idx 与 z-index；
 *   · 默认 transform: rotateY(0) 在右半
 *   · .is-fanning   → rotateY(-72°)  过渡 340ms（Fan 段，均匀缓动）
 *   · .is-dropping  → rotateY(-180°) 过渡 420ms（Drop 段，纸张落下缓动）
 *   · [data-state="turned"] → 静态驻留在左半（rotateY(-180°)，无过渡）
 * ================================================================== */
.quiz-book__leaf {
  position: absolute;
  top: 0; left: 50%;
  width: 50%; height: 100%;
  transform-origin: left center;
  transform-style: preserve-3d;
  transform: rotateY(0deg);
  transition: transform 340ms cubic-bezier(0.45, 0, 0.55, 1);
  will-change: transform;
}
.quiz-book__leaf.is-fanning {
  transform: rotateY(-72deg);
}
.quiz-book__leaf.is-dropping {
  transform: rotateY(-180deg);
  transition: transform 420ms cubic-bezier(0.55, 0, 0.4, 1);
}
.quiz-book__leaf[data-state="turned"] {
  transform: rotateY(-180deg);
  transition: none;
}

/* leaf 的两面（双面白纸） */
.quiz-book__leaf-face {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--book-paper-start) 0%, var(--book-paper-end) 100%);
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  overflow: hidden;
}
.quiz-book__leaf-face--front {
  border-radius: 0 8px 8px 0;
  box-shadow:
    inset 0 0 0 1px var(--book-accent-weak),
    inset 10px 0 30px -20px rgba(14,16,24,0.15);
}
.quiz-book__leaf-face--back {
  transform: rotateY(180deg);
  border-radius: 8px 0 0 8px;
  box-shadow:
    inset 0 0 0 1px var(--book-accent-weak),
    inset -10px 0 30px -20px rgba(14,16,24,0.15);
}

/* —— curl 瞬态阴影/高光：翻页时纸张弯曲的明暗过渡 —— */
.quiz-book__leaf-face::before,
.quiz-book__leaf-face::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  z-index: 2;
}
.quiz-book__leaf-face--front::before {
  background: linear-gradient(105deg,
    rgba(14,16,24,0.00) 0%, rgba(14,16,24,0.00) 50%,
    rgba(14,16,24,0.04) 72%, rgba(14,16,24,0.12) 88%, rgba(14,16,24,0.22) 100%);
  mix-blend-mode: multiply;
}
.quiz-book__leaf-face--front::after {
  background: linear-gradient(255deg,
    rgba(255,252,240,0.00) 0%, rgba(255,252,240,0.00) 60%,
    rgba(255,252,240,0.18) 82%, rgba(255,252,240,0.28) 92%, rgba(255,252,240,0.00) 100%);
  mix-blend-mode: screen;
}
.quiz-book__leaf.is-fanning  .quiz-book__leaf-face--front::before,
.quiz-book__leaf.is-dropping .quiz-book__leaf-face--front::before {
  animation: qb-curl-shade 760ms cubic-bezier(0.55, 0, 0.4, 1);
}
.quiz-book__leaf.is-fanning  .quiz-book__leaf-face--front::after,
.quiz-book__leaf.is-dropping .quiz-book__leaf-face--front::after {
  animation: qb-curl-light 760ms cubic-bezier(0.55, 0, 0.4, 1);
}
@keyframes qb-curl-shade {
  0%   { opacity: 0; }
  45%  { opacity: 0.85; }
  60%  { opacity: 0.55; }
  100% { opacity: 0; }
}
@keyframes qb-curl-light {
  0%   { opacity: 0; }
  45%  { opacity: 0.90; }
  60%  { opacity: 0.50; }
  100% { opacity: 0; }
}

/* —— 封面 BACK FACE 内 meta 容器 ——
 *   meta 文字现在直接印在 .quiz-book__front-cover-face--back 上，与 3D 栈同 z 深度。
 *   currentIdx === 0 时这片 face 是左半最顶层 → 文字可见；
 *   只要有任意 turned leaf（z=20+turnedCount）覆盖在它上面 → 文字被自然遮挡。
 *   旧的 .quiz-book__left-overlay 与 ::before 已废弃（保留空 selector 防万一被引用）。
 */
.qb-cover-back-inner {
  position: absolute;
  inset: 0;
  padding: 48px 44px 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  color: var(--book-ink);
  pointer-events: none;
}
/* 横线纸背景肌理（仅在 face 上） */
.quiz-book__front-cover-face--back .qb-cover-back-inner::before {
  content: '';
  position: absolute;
  left: 18%; right: 18%;
  top: 66%; bottom: 10%;
  background: repeating-linear-gradient(to bottom,
    transparent 0, transparent 14px,
    var(--book-accent-weak) 14px, var(--book-accent-weak) 15px);
  opacity: 0.55;
  pointer-events: none;
  z-index: 0;
}
.qb-cover-back-inner > * { position: relative; z-index: 1; }

/* —— 右侧 overlay（当前题内容）—— */
.quiz-book__right-overlay {
  position: absolute;
  top: 0; left: 50%;
  width: 50%; height: 100%;
  padding: 48px 48px 40px;
  display: flex;
  flex-direction: column;
  color: var(--book-ink);
  z-index: 200;
  cursor: pointer;
  pointer-events: none;
  opacity: 0;
  transform: rotateY(0deg);
  transform-origin: left center;              /* 绕书脊翻 */
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;        /* 翻过边缘时自动隐藏镜像内容 */
  transition: opacity 400ms ease;
}
.quiz-book.is-open .quiz-book__right-overlay {
  pointer-events: auto;
  opacity: 1;
}
.quiz-book__right-overlay.is-fading-in {
  opacity: 0;
}
/* —— 半卡翻动画：opacity 在 25–75% 锁零，rotateY 0→-90 / 跳到 +90 →0，——
 *   ·Fan 段（0→50%）用 Fan 缓动 cubic-bezier(0.45, 0, 0.55, 1)
 *   ·Drop 段（50%→100%）用 Drop 缓动 cubic-bezier(0.55, 0, 0.4, 1)
 *   ·总时长 760ms 与 leaf 的 Fan(340) + Drop(420) 对齐
 *   ·内容注入点（前翻 340ms ≈ 44.7%、后翻 420ms ≈ 55.3%）都落在"接近边缘 + 透明"窗口内
 */
@keyframes qb-overlay-half-flip {
  0% {
    transform: rotateY(0deg);
    opacity: 1;
    animation-timing-function: cubic-bezier(0.45, 0, 0.55, 1);
  }
  25% {
    opacity: 0;
  }
  50% {
    transform: rotateY(-90deg);
    opacity: 0;
  }
  50.01% {
    transform: rotateY(90deg);
    opacity: 0;
    animation-timing-function: cubic-bezier(0.55, 0, 0.4, 1);
  }
  75% {
    opacity: 0;
  }
  100% {
    transform: rotateY(0deg);
    opacity: 1;
  }
}
/* 开书（封面 Fan+Drop）期间：硬隐藏 overlay，等封面落定再淡入。
 *   这个分支不跑半卡翻，因为此时没有"前一题文字"可翻，overlay 是首次显示。 */
.quiz-book.is-turning:not(.is-flipping-page) .quiz-book__right-overlay {
  opacity: 0;
  pointer-events: none;
}
/* 翻页（题目间切换）期间：用半卡翻 animation 接管 transform + opacity */
.quiz-book.is-flipping-page .quiz-book__right-overlay {
  animation: qb-overlay-half-flip 760ms both;
  pointer-events: none;
}

/* —— 中央书脊金线（打开后显现）—— */
.quiz-book__spine-line {
  position: absolute;
  top: 36px; bottom: 36px;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent 0%, var(--book-spine) 50%, transparent 100%);
  box-shadow: 0 0 10px var(--book-accent-soft);
  pointer-events: none;
  z-index: 70;
  opacity: 0;
  transition: opacity 360ms ease;
}
.quiz-book.is-open .quiz-book__spine-line { opacity: 1; }

/* —— 书签带：高 z-index 始终可见，打开后向左滑到左页上方 —— */
.quiz-book__ribbon {
  position: absolute;
  top: -10px;
  left: calc(50% + 4%);        /* 合拢态：紧贴书脊右侧（右半上方） */
  width: 22px;
  height: 132px;
  background: linear-gradient(180deg, var(--book-ribbon-start) 0%, var(--book-ribbon-end) 100%);
  border-radius: 0 0 4px 4px;
  box-shadow: 2px 0 8px rgba(0,0,0,0.15);
  pointer-events: none;
  z-index: 6500;
  transition: left 760ms cubic-bezier(0.55, 0, 0.4, 1);
}
.quiz-book.is-open .quiz-book__ribbon {
  left: 22%;                    /* 打开态：飘到左页上方 */
}
.quiz-book__ribbon::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -10px;
  height: 10px;
  background:
    linear-gradient(135deg,  var(--book-ribbon-start) 50%, transparent 50%)  0   0 / 11px 10px,
    linear-gradient(-135deg, var(--book-ribbon-start) 50%, transparent 50%) 11px 0 / 11px 10px;
  background-repeat: no-repeat;
}

/* —— 封面（front cover，右半，关闭态 z=5000，打开后 z=10）—— */
.quiz-book__front-cover {
  position: absolute;
  top: 0; left: 50%;
  width: 50%; height: 100%;
  transform-origin: left center;
  transform-style: preserve-3d;
  transform: rotateY(0deg);
  z-index: 5000;
  cursor: pointer;
  transition: transform 340ms cubic-bezier(0.45, 0, 0.55, 1);
  will-change: transform;
  outline: none;
}
.quiz-book__front-cover:focus-visible {
  box-shadow: 0 0 0 3px var(--book-accent-soft);
}
.quiz-book__front-cover.is-fanning {
  transform: rotateY(-72deg);
}
.quiz-book__front-cover.is-dropping {
  transform: rotateY(-180deg);
  transition: transform 420ms cubic-bezier(0.55, 0, 0.4, 1);
}
.quiz-book__front-cover[data-state="opened"] {
  transform: rotateY(-180deg);
  transition: none;
  z-index: 70;            /* 打开后驻留左侧：高于所有 turned leaves（21..60），封面 back face 上的 meta 文字持续可见 */
  pointer-events: none;
  cursor: default;
}

.quiz-book__front-cover-face {
  position: absolute;
  inset: 0;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  overflow: hidden;
}
.quiz-book__front-cover-face--front {
  border-radius: 6px 14px 14px 6px;
  background:
    radial-gradient(120% 45% at 50% 0%, rgba(255,255,255,0.06) 0%, transparent 60%),
    linear-gradient(140deg, var(--book-cover-start) 0%, var(--book-cover-end) 100%);
  color: #F5EFE2;
  box-shadow: inset 0 0 0 1.5px var(--book-accent-soft);
}
.quiz-book__front-cover-face--back {
  transform: rotateY(180deg);
  border-radius: 14px 6px 6px 14px;
  background: linear-gradient(180deg, var(--book-paper-start) 0%, var(--book-paper-end) 100%);
  box-shadow:
    inset 0 0 0 1px var(--book-accent-weak),
    inset -10px 0 30px -20px rgba(14,16,24,0.15);
}
.quiz-book__front-cover:not([data-state="opened"]):hover {
  filter: brightness(1.04);
}


/* —— 右页排版 —— */
.qb-q-head {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-weight: 600;
  color: var(--book-accent);
  letter-spacing: 0.22em;
  font-size: 0.7rem;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.qb-q-text {
  font-family: "Noto Serif SC", serif;
  font-size: 1.375rem;
  line-height: 1.55;
  font-weight: 500;
  color: var(--book-ink);
  margin: 6px 0 24px;
  min-height: 3em;
}
.qb-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}
.qb-option {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 11px 16px;
  border-radius: 10px;
  background: rgba(255,253,245,0.72);
  border: 1px solid var(--book-accent-weak);
  color: var(--book-ink);
  text-align: left;
  font-size: 0.9375rem;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
}
.qb-option:hover {
  background: rgba(255,253,245,0.96);
  border-color: var(--book-accent-soft);
  transform: translateX(4px);
}
.qb-option__num {
  display: inline-flex;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--book-accent-weak);
  color: var(--book-accent);
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
  flex-shrink: 0;
  transition: background 0.2s, color 0.2s;
}
.qb-option.is-selected {
  background: rgba(197,163,88,0.10);
  border-color: var(--book-accent);
}
.qb-option.is-selected .qb-option__num {
  background: var(--book-accent);
  color: var(--book-paper-start);
}
.qb-option__label { flex: 1; }
.qb-next-hint {
  margin-top: 16px;
  font-family: "Cormorant Garamond", serif;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: rgba(47,36,23,0.4);
  text-align: right;
  text-transform: uppercase;
}

/* ───────────────────────────────────────────────────────────── */
/* 封面 face 内部装饰（.quiz-cover__* 类只用于 front-cover-face   */
/* --front 内部，无需结构层 .quiz-cover）                          */
/* ───────────────────────────────────────────────────────────── */

/* 封面内沿压印框 */
.quiz-cover__frame {
  position: absolute;
  inset: 28px 30px 34px 36px;
  border: 1px solid var(--book-accent-weak);
  border-radius: 2px;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.12);
}

/* 书脊金边：紧贴封面 face 左缘（=书的中心轴/旋转轴） */
.quiz-cover__spine {
  position: absolute;
  top: 0; bottom: 0;
  left: 0;
  width: 8px;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--book-cover-end) 60%, #000 40%) 0%,
    color-mix(in srgb, var(--book-cover-end) 80%, #000 20%) 50%,
    color-mix(in srgb, var(--book-cover-end) 60%, #000 40%) 100%);
  box-shadow: inset 1px 0 2px rgba(0,0,0,0.4);
  pointer-events: none;
}

/* 内容容器 */
.quiz-cover__inner {
  position: relative;
  height: 100%;
  padding: 60px 44px 48px 50px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.quiz-cover__volume {
  font-family: "Manrope", "Inter", sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--book-accent) 60%, #F5EFE2 40%);
  margin-bottom: 12px;
}

.quiz-cover__volume::before,
.quiz-cover__volume::after {
  content: "✦";
  margin: 0 10px;
  color: var(--book-accent-soft);
  font-size: 9px;
  vertical-align: middle;
}

.quiz-cover__bigchar {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: clamp(140px, 28vw, 240px);
  line-height: 0.9;
  font-weight: 600;
  background: var(--book-bigchar-grad);
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin: 12px 0 18px;
  filter: drop-shadow(0 4px 12px rgba(0,0,0,0.35));
  user-select: none;
}

.quiz-cover__title {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: clamp(26px, 4.4vw, 38px);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  color: #F5EFE2;
  margin-bottom: 6px;
}

.quiz-cover__rule {
  width: 48px;
  height: 1px;
  background: var(--book-accent-soft);
  margin: 10px auto 14px;
}

.quiz-cover__subtitle {
  font-family: "Manrope", "Inter", sans-serif;
  font-size: 13px;
  line-height: 1.65;
  color: color-mix(in srgb, #F5EFE2 70%, transparent);
  max-width: 28ch;
  margin-bottom: 20px;
}

.quiz-cover__desc {
  font-family: "Noto Sans SC", "Manrope", sans-serif;
  font-size: 12px;
  line-height: 1.7;
  color: color-mix(in srgb, #F5EFE2 55%, transparent);
  max-width: 32ch;
  margin-bottom: 22px;
}

.quiz-cover__meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  font-family: "Manrope", "Inter", sans-serif;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: color-mix(in srgb, #F5EFE2 55%, transparent);
  margin-bottom: auto;
}

.quiz-cover__meta-dot {
  color: var(--book-accent-soft);
}

.quiz-cover__cta {
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 28px;
  border-radius: 999px;
  background: linear-gradient(135deg,
    color-mix(in srgb, var(--book-accent) 95%, #fff 5%) 0%,
    color-mix(in srgb, var(--book-accent) 70%, #000 30%) 100%);
  color: var(--book-cover-end);
  font-family: "Manrope", "Inter", sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid color-mix(in srgb, var(--book-accent) 70%, #fff 30%);
  box-shadow:
    0 10px 24px -6px rgba(0,0,0,0.4),
    inset 0 1px 0 rgba(255,255,255,0.2);
  cursor: pointer;
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.quiz-cover__cta:hover {
  transform: translateY(-1px);
  box-shadow:
    0 14px 32px -6px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.25);
}

.quiz-cover__cta i {
  width: 16px;
  height: 16px;
}

/* ─── 结果阶段淡入 ─── */
#result {
  transition: opacity 450ms ease;
}
#result.is-fading-in {
  opacity: 0;
}

/* ─── 小屏降级：单列、停用 3D ─── */
@media (max-width: 767px) {
  .quiz-book-stage {
    min-height: 0;
    padding: 24px 8px 48px;
    perspective: none;
  }
  .quiz-book {
    --qb-w: 94vw;
    --qb-h: auto;
    height: auto;
    min-height: 580px;
    transform: none !important;
  }
  .quiz-book__shadow { display: none; }
  .quiz-book__back-cover,
  .quiz-book__front-cover,
  .quiz-book__leaf {
    left: 0;
    width: 100%;
    transform-origin: center center;
  }
  .quiz-book__leaf,
  .quiz-book__leaf.is-fanning,
  .quiz-book__leaf.is-dropping,
  .quiz-book__leaf[data-state="turned"],
  .quiz-book__front-cover,
  .quiz-book__front-cover.is-fanning,
  .quiz-book__front-cover.is-dropping,
  .quiz-book__front-cover[data-state="opened"] {
    transform: none !important;
    transition: opacity 300ms ease;
  }
  .quiz-book__left-overlay,
  .quiz-book__right-overlay {
    position: relative;
    width: 100%;
    height: auto;
    left: auto; top: auto;
    padding: 28px 22px 24px;
  }
  .quiz-book__spine-line,
  .quiz-book__ribbon { display: none; }
}

/* ─── 无障碍：尊重 reduced-motion ─── */
@media (prefers-reduced-motion: reduce) {
  .quiz-book {
    transition: opacity 200ms ease !important;
    transform: none !important;
  }
  .quiz-book__leaf,
  .quiz-book__front-cover,
  .quiz-book__shadow,
  .quiz-book__ribbon,
  .quiz-book__spine-line,
  .quiz-book__left-overlay,
  .quiz-book__right-overlay {
    transition: opacity 200ms ease !important;
  }
  .quiz-book__leaf.is-fanning,
  .quiz-book__leaf.is-dropping,
  .quiz-book__leaf[data-state="turned"],
  .quiz-book__front-cover.is-fanning,
  .quiz-book__front-cover.is-dropping,
  .quiz-book__front-cover[data-state="opened"] {
    transform: rotateY(-180deg) !important;
  }
  .quiz-book__leaf-face::before,
  .quiz-book__leaf-face::after {
    animation: none !important;
  }
}

/* 尊重系统偏好 */
@media (prefers-reduced-motion: reduce) {
  .tarot-3d, .book-3d,
  .tarot-3d-wrap::after, .book-3d-wrap::after,
  .tarot-3d-star { animation: none !important; }
}

/* ─────────────────────────────────────────────────── */
/* .editor-book —— 测试编辑器的摊开工作册                */
/* 每个 tab 一册；左页 console，右页 content（2x2 slots） */
/* 与 .quiz-book 调色板家族同源，但走「工作台」浅色调    */
/* ─────────────────────────────────────────────────── */
.editor-book {
  --eb-cover-start: #EFE7D4;      /* 暖米封面 */
  --eb-cover-end:   #D9CDB0;
  --eb-paper-start: #FDFCF7;      /* 页面更白 */
  --eb-paper-end:   #F4EEDC;
  --eb-spine:       rgba(26, 29, 41, 0.28);
  --eb-ribbon-start: #8E342C;
  --eb-ribbon-end:   #5C231E;
  --eb-accent:      #1A1D29;      /* 墨色强调 */
  --eb-accent-soft: rgba(26, 29, 41, 0.35);
  --eb-accent-weak: rgba(26, 29, 41, 0.12);
  --eb-ink:         #1A1D29;
  --eb-ink-soft:    rgba(26, 29, 41, 0.65);
  --eb-ink-mute:    rgba(26, 29, 41, 0.45);

  position: relative;
  width: min(1120px, 96vw);
  margin: 20px auto 40px;
  perspective: 2400px;
}

.editor-book__inner {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 620px;
  border-radius: 16px;
  padding: 16px;
  background: linear-gradient(180deg, var(--eb-cover-start) 0%, var(--eb-cover-end) 100%);
  box-shadow:
    inset 0 0 0 1.5px var(--eb-accent-weak),
    0 30px 60px -20px rgba(14, 16, 24, 0.22),
    0 14px 28px -10px rgba(14, 16, 24, 0.15);
}

.editor-book__page {
  position: relative;
  background: linear-gradient(180deg, var(--eb-paper-start) 0%, var(--eb-paper-end) 100%);
  color: var(--eb-ink);
  box-shadow:
    inset 0 0 0 1px var(--eb-accent-weak),
    inset 0 18px 30px -20px rgba(14, 16, 24, 0.08);
  min-height: 588px;
  padding: 32px 32px 28px;
  overflow: auto;
}

.editor-book__page--left {
  border-radius: 8px 0 0 8px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.editor-book__page--right {
  border-radius: 0 8px 8px 0;
  padding: 32px 32px 28px;
}

.editor-book__spine {
  position: absolute;
  top: 16px; bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  background: linear-gradient(180deg,
    transparent 0%,
    var(--eb-spine) 12%,
    var(--eb-spine) 88%,
    transparent 100%);
  pointer-events: none;
  z-index: 2;
}

.editor-book__ribbon {
  position: absolute;
  top: -6px;
  right: 72px;
  width: 22px;
  height: 84px;
  background: linear-gradient(180deg, var(--eb-ribbon-start) 0%, var(--eb-ribbon-end) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 82%, 0 100%);
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.22);
  pointer-events: none;
  z-index: 3;
}

/* ── 左页 console ───────────────────────────────── */
.eb-volume {
  font: 600 11px/1 "Manrope", sans-serif;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--eb-ink-mute);
  display: flex; align-items: center; gap: 8px;
}
.eb-volume::before,
.eb-volume::after {
  content: "";
  flex: 0 1 24px;
  height: 1px;
  background: var(--eb-accent-weak);
}

.eb-chapter-char {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: clamp(92px, 9vw, 140px);
  line-height: 0.9;
  font-weight: 600;
  color: var(--eb-ink);
  opacity: 0.92;
  margin: 4px 0 4px;
  letter-spacing: -0.02em;
}

.eb-title {
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--eb-ink);
  margin-bottom: 4px;
}
.eb-subtitle {
  font-family: "Manrope", sans-serif;
  font-size: 13px;
  line-height: 1.65;
  color: var(--eb-ink-soft);
  margin-bottom: 12px;
}

.eb-rule {
  width: 40px;
  height: 1px;
  background: var(--eb-accent-soft);
  margin: 4px 0 16px;
}

/* 控制台按钮组 */
.eb-console {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: auto;       /* 把 console 顶到底部 */
}
.eb-console-actions {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.eb-console-actions .btn-ink,
.eb-console-actions .btn-ghost,
.eb-console-actions .mini-btn {
  flex: 0 0 auto;
}

/* 分页器 */
.eb-pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(26, 29, 41, 0.04);
  border: 1px solid var(--eb-accent-weak);
}
.eb-pager__btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px;
  border-radius: 8px;
  background: #FFFDF8;
  border: 1px solid var(--eb-accent-weak);
  color: var(--eb-ink);
  cursor: pointer;
  transition: background 0.15s ease;
}
.eb-pager__btn:hover { background: rgba(26, 29, 41, 0.06); }
.eb-pager__btn:disabled { opacity: 0.35; cursor: not-allowed; }
.eb-pager__info {
  font: 600 12px/1 "Manrope", sans-serif;
  letter-spacing: 0.1em;
  color: var(--eb-ink-soft);
}
.eb-pager__info strong {
  color: var(--eb-ink);
  font-family: "Cormorant Garamond", "Noto Serif SC", serif;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0;
}

/* 左页的 count 小徽章 */
.eb-count {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--eb-accent);
  color: #F4E4B4;
  font: 600 11px/1 "Manrope", sans-serif;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  align-self: flex-start;
}

/* 验证警告（左页底部，弱于正文） */
.eb-warning {
  background: rgba(200, 138, 46, 0.12);
  border-left: 3px solid #C88A2E;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 12px;
  line-height: 1.55;
  color: #4A3510;
}

/* ── 右页 slots ──────────────────────────────── */
.eb-slots {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  align-content: start;
}
.eb-slot {
  background: #FFFDF8;
  border: 1px solid var(--eb-accent-weak);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 240px;
  position: relative;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.eb-slot:hover {
  border-color: var(--eb-accent-soft);
  box-shadow: 0 6px 18px -6px rgba(14, 16, 24, 0.14);
}
.eb-slot__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--eb-accent-weak);
  margin-bottom: 4px;
}
.eb-slot__seq {
  font: 600 11px/1 "Inter", monospace;
  letter-spacing: 0.12em;
  color: var(--eb-ink-mute);
  text-transform: uppercase;
}
.eb-slot__actions {
  display: inline-flex; gap: 4px;
}
.eb-slot__label {
  font: 600 11px/1 "Manrope", sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--eb-ink-mute);
}
.eb-slot__body {
  display: flex; flex-direction: column; gap: 8px;
}

/* 单列 / 全宽 slot（评分、预览等用） */
.eb-slots--single {
  grid-template-columns: 1fr;
}

/* 右页的容器变体：当右页不是 2x2 slot 网格，而是一个表单/文档时用 */
.eb-doc {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.eb-doc h3 {
  font: 600 18px/1.3 "Cormorant Garamond", "Noto Serif SC", serif;
  letter-spacing: 0.04em;
  color: var(--eb-ink);
  margin-bottom: 2px;
}

/* ── 窄屏：折叠为上下两页 ───────────────────────── */
@media (max-width: 900px) {
  .editor-book {
    width: 96vw;
    margin: 12px auto 32px;
  }
  .editor-book__inner {
    grid-template-columns: 1fr;
    min-height: 0;
  }
  .editor-book__page {
    min-height: 0;
    padding: 24px 20px;
  }
  .editor-book__page--left {
    border-radius: 8px 8px 0 0;
  }
  .editor-book__page--right {
    border-radius: 0 0 8px 8px;
  }
  .editor-book__spine {
    top: auto; bottom: auto;
    left: 16px; right: 16px;
    width: auto; height: 2px;
    transform: none;
    top: 50%;
  }
  .editor-book__ribbon { display: none; }
  .eb-slots { grid-template-columns: 1fr; }
}

/* ——— Utility：浅浮层 ——— */
.floating-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.5;
  pointer-events: none;
  animation: float 8s ease-in-out infinite;
}

.floating-orb--gold {
  background: radial-gradient(circle, rgba(197, 163, 88, 0.4), transparent 70%);
}

.floating-orb--rabbit {
  background: radial-gradient(circle, rgba(233, 169, 169, 0.4), transparent 70%);
}

.floating-orb--sage {
  background: radial-gradient(circle, rgba(122, 160, 129, 0.3), transparent 70%);
}

.floating-orb--mint {
  background: radial-gradient(circle, rgba(156, 207, 168, 0.38), transparent 70%);
}

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  33%      { transform: translate(30px, -20px); }
  66%      { transform: translate(-20px, 15px); }
}

/* =========================================================
   Portal 转场：塔罗 3D Hero → 塔罗页
   —— 点击时卡片朝用户浮起覆盖整屏，再切到 tarot.html
   ========================================================= */

/* 全屏深色晕边，带 backdrop-filter，从透明渐入 */
.tarot-portal-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at 50% 45%, rgba(26,29,41,0) 0%, rgba(10,12,18,0) 70%);
  -webkit-backdrop-filter: blur(0px) saturate(1);
          backdrop-filter: blur(0px) saturate(1);
  z-index: 9998;
  pointer-events: none;
  opacity: 1;
  transition:
    background 900ms cubic-bezier(0.35, 0, 0.15, 1),
    -webkit-backdrop-filter 900ms cubic-bezier(0.35, 0, 0.15, 1),
            backdrop-filter 900ms cubic-bezier(0.35, 0, 0.15, 1);
}
.tarot-portal-overlay.is-active {
  background: radial-gradient(ellipse at 50% 45%, rgba(26,29,41,0.78) 0%, rgba(10,12,18,0.98) 75%);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
          backdrop-filter: blur(14px) saturate(1.15);
}

/* 轻微的金色光晕粒子层，在覆盖层之上、卡片之下 */
.tarot-portal-overlay::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(197,163,88,0.18), transparent 30%),
    radial-gradient(circle at 70% 65%, rgba(232,216,176,0.14), transparent 35%),
    radial-gradient(circle at 50% 50%, rgba(197,163,88,0.22), transparent 45%);
  opacity: 0;
  transition: opacity 1100ms ease-out 200ms;
}
.tarot-portal-overlay.is-active::after { opacity: 1; }

/* 浮起的克隆卡片 */
.tarot-portal-clone {
  position: fixed;
  z-index: 9999;
  margin: 0;
  pointer-events: none;
  will-change: transform, opacity, filter;
  /* 取消原有浮动动画，交给 transition */
  animation: none !important;
  box-shadow:
    inset 0 0 0 1.5px rgba(197,163,88,0.55),
    0 50px 120px rgba(14,16,24,0.85),
    0 0 80px rgba(197,163,88,0.5);
  filter: drop-shadow(0 0 0 rgba(197,163,88,0));
}
.tarot-portal-clone.is-flying {
  transition:
    transform 1150ms cubic-bezier(0.32, 0, 0.18, 1),
    filter   1150ms cubic-bezier(0.32, 0, 0.18, 1),
    opacity   350ms ease-out;
  filter: drop-shadow(0 0 40px rgba(197,163,88,0.45));
}

/* 降级：系统偏好减少动效时，不做转场 */
@media (prefers-reduced-motion: reduce) {
  .tarot-portal-overlay,
  .tarot-portal-clone,
  .page-entry-scrim { display: none !important; }
}

/* 目标页（tarot.html）接住 portal 转场：从黑雾淡出到内容 */
.page-entry-scrim {
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at 50% 45%, rgba(26,29,41,0.95) 0%, rgba(10,12,18,1) 70%);
  z-index: 9998;
  pointer-events: none;
  opacity: 1;
  -webkit-backdrop-filter: blur(14px);
          backdrop-filter: blur(14px);
  animation: page-entry-fade 700ms cubic-bezier(0.25, 0, 0.15, 1) forwards;
}
.page-entry-scrim::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 45%, rgba(197,163,88,0.25), transparent 40%);
  animation: page-entry-glow 700ms ease-out forwards;
}
@keyframes page-entry-fade {
  0%   { opacity: 1; -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px); }
  100% { opacity: 0; -webkit-backdrop-filter: blur(0px);  backdrop-filter: blur(0px); }
}
@keyframes page-entry-glow {
  0%   { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.35); }
}


/* ============================================================
   .book-open  ——  书架专用「会翻开的立体书」
   结构：
     · 一片后书壳（始终静止，作为基底+背景）
     · 中间 N 片白色书页（默认堆叠，打开时扇形展开 + 向两侧落下）
     · 一片前书壳（封面，绕左边缘翻开 -180°）
   状态：
     · 默认 = 关上的书（只看到封面）；stage 持续做 7s idle 浮动循环
     · .is-fanned  = 书页扇形展开 + 封面开始翻开（hover/focus 第一阶段）
     · .is-opened  = 书页落向两侧 + 封面完全翻平（第二阶段，持续至离开）
     交互由 library.html 的 bindBookHover() 用 mouseenter/leave + focusin/out 驱动
   颜色变量：复用 .book-3d-wrap 体系
     --book-cover-start / --book-cover-end / --book-paper-start / --book-paper-end
     --book-spine / --book-accent / --book-bigchar-grad
   ============================================================ */

.book-open {
  /* 尺寸 token —— 在 .bookshelf__slot 里会被覆盖 */
  --book-w: 200px;
  --book-h: 280px;
  /* 书页/书壳的"厚度"——决定 z 轴堆叠间距 */
  --book-leaf-z-step: 2px;        /* 每片书页之间的 z 间距 */
  --book-half-thickness: 12px;    /* 书脊一半厚度（封面在 +12，封底在 -12）*/
  /* 摊开姿态 —— 与 hero (.book-3d) 的倾角完全对齐：
     rotateX(52deg) 书面朝上，rotateZ(-14deg) 整体左倾 */
  --book-rx: 52deg;
  --book-rz: -14deg;

  position: relative;
  width: var(--book-w);
  height: var(--book-h);
  perspective: 1500px;
  perspective-origin: 50% 30%;
  margin: 0 auto;
  cursor: pointer;
  /* 让翻开时溢出到相邻 slot 不被裁掉 */
  overflow: visible;
}

.book-open__stage {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  /* 摊开姿态：rotateX(var(--book-rx)) rotateZ(var(--book-rz))
     实际 transform 由 @keyframes book-open-float 驱动（见文件下方） */
}

/* —— 后书壳（封底）：永远静止 —— */
.book-open__back-cover {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    var(--book-cover-start, #2a2f3d) 0%,
    var(--book-cover-end,   #14171f) 100%);
  border-radius: 4px 8px 8px 4px;
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.04),
    inset -2px 0 6px rgba(0,0,0,0.25);
  transform: translateZ(calc(-1 * var(--book-half-thickness)));
}
/* 后书壳左侧的"书脊"色带 */
.book-open__back-cover::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: 14px;
  background: linear-gradient(90deg,
    var(--book-spine, #1a1d29) 0%,
    rgba(0,0,0,0) 100%);
  border-radius: 4px 0 0 4px;
}

/* —— 中间的薄白书页 —— */
.book-open__leaf {
  position: absolute;
  inset: 0;
  border-radius: 2px 6px 6px 2px;
  background: linear-gradient(135deg,
    var(--book-paper-start, #faf6ec) 0%,
    var(--book-paper-end,   #f1e9d4) 100%);
  /* 边缘做出真实纸张层叠：顶/底/右极淡阴影 + 极细描边 */
  box-shadow:
    inset 0 0 0 1px rgba(120,90,40,0.07),
    inset -2px 0 4px rgba(120,90,40,0.10),
    inset 0 -1px 2px rgba(120,90,40,0.06);
  transform: translateZ(var(--leaf-z, 0px));
  transform-origin: left center;
  transform-style: preserve-3d;
}
/* 给每页右边一道极淡的"页码线"，强化纸感 */
.book-open__leaf::after {
  content: "";
  position: absolute;
  top: 8%; bottom: 8%;
  right: 6px;
  width: 1px;
  background: linear-gradient(180deg,
    transparent 0%,
    rgba(120,90,40,0.18) 50%,
    transparent 100%);
}

/* ============================================================
   书页内容 —— 翻开后显示在视觉焦点的两片页上
   · .book-open__page--right 放在 idx 0（右侧最上页，正面朝上）
   · .book-open__page--left  放在 idx 5（左侧最上页，rotateY(180°) 补偿 leaf 翻转，让文字正读）
   · 默认 opacity: 0；is-opened 时延迟淡入，避免翻书过程中字乱晃
   ============================================================ */
.book-open__page {
  position: absolute;
  inset: 0;
  padding: 20px 18px 16px 20px;
  display: flex;
  flex-direction: column;
  color: rgba(50, 36, 12, 0.85);
  font-family: 'Noto Serif SC', 'Cormorant Garamond', serif;
  pointer-events: none;
  backface-visibility: hidden;
  /* 安全阀：长摘要/长标题的极端情况下静默截断，不溢出纸页边缘 */
  overflow: hidden;
  opacity: 0;
  transition: opacity 220ms ease-out;
}
/* 左页装在 idx 5 的 back face 上 → 内部再 180° 把文字转正 */
.book-open__page--left {
  transform: rotateY(180deg);
  padding-right: 20px;
  padding-left: 18px;  /* 翻转后"左边距"从代码视角看是右侧 */
}
/* drop 基本结束后（约 550ms）再让文字淡入 */
.book-open.is-opened .book-open__page {
  opacity: 1;
  transition: opacity 260ms ease-out 550ms;
}

.book-open__page-eyebrow {
  font-family: 'Cormorant Garamond', 'Noto Serif SC', serif;
  font-size: 0.62rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  opacity: 0.55;
  margin-bottom: 10px;
}

/* 右页：测试摘要 */
.book-open__page--right .book-open__page-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.35;
  color: rgba(40, 28, 10, 0.92);
  /* 长标题最多两行，避免撑破页面 */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.book-open__page--right .book-open__page-rule {
  width: 32px;
  height: 1px;
  background: var(--book-accent, #C5A358);
  opacity: 0.55;
  margin: 10px 0 12px;
}
.book-open__page-desc {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 0.68rem;
  line-height: 1.55;
  opacity: 0.7;
  margin: 0 0 12px;
  /* 超长摘要最多 3 行 */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.book-open__page-meta {
  list-style: none;
  margin: auto 0 0;
  padding: 0;
  font-family: 'Manrope', 'Noto Sans SC', sans-serif;
  font-size: 0.68rem;
  opacity: 0.72;
}
.book-open__page-meta li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 2px 0;
  border-bottom: 1px dotted rgba(120,90,40,0.22);
}
.book-open__page-meta li:last-child { border-bottom: none; }
.book-open__page-meta li > span:first-child {
  letter-spacing: 0.12em;
  opacity: 0.7;
}
.book-open__page-meta li > span:last-child {
  font-weight: 600;
  color: rgba(40, 28, 10, 0.85);
}
.book-open__page-cta {
  margin-top: 10px;
  font-family: 'Manrope', sans-serif;
  font-size: 0.66rem;
  letter-spacing: 0.26em;
  color: var(--book-accent, #C5A358);
  text-transform: uppercase;
  text-align: right;
}

/* 左页：hero 式大字 */
.book-open__page--left .book-open__page-bigchar {
  font-family: 'Noto Serif SC', serif;
  font-size: 4.2rem;
  font-weight: 700;
  line-height: 1;
  margin: 14px 0 0;
  background: var(--book-bigchar-grad,
    linear-gradient(135deg, #C5A358 0%, #8a6b2a 100%));
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
  align-self: flex-start;
}
.book-open__page--left .book-open__page-rule {
  width: 36px;
  height: 1px;
  background: var(--book-accent, #C5A358);
  opacity: 0.5;
  margin: 16px 0 10px;
}
.book-open__page--left .book-open__page-subtitle {
  margin-top: auto;
  font-family: 'Manrope', sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--book-accent, #C5A358);
  opacity: 0.85;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* —— 前书壳（封面）：会翻开的那一片 —— */
.book-open__front-cover {
  position: absolute;
  inset: 0;
  border-radius: 4px 8px 8px 4px;
  background: linear-gradient(135deg,
    var(--book-cover-start, #2a2f3d) 0%,
    var(--book-cover-end,   #14171f) 100%);
  transform: translateZ(var(--book-half-thickness));
  transform-origin: left center;
  transform-style: preserve-3d;
  backface-visibility: hidden;
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.06),
    inset 0 -8px 24px rgba(0,0,0,0.22),
    0 6px 18px rgba(0,0,0,0.18);
  overflow: hidden;
}
/* 封面左侧书脊色带 */
.book-open__front-cover::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0;
  width: 14px;
  background: linear-gradient(90deg,
    var(--book-spine, #1a1d29) 0%,
    rgba(0,0,0,0) 100%);
  pointer-events: none;
  z-index: 2;
}
/* 封面背面：浅色环衬纸（翻开后朝向观者） */
.book-open__front-cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    var(--book-paper-start, #faf6ec) 0%,
    var(--book-paper-end,   #f1e9d4) 100%);
  border-radius: 4px 8px 8px 4px;
  transform: rotateY(180deg);
  backface-visibility: hidden;
  box-shadow:
    inset 0 0 0 1px rgba(120,90,40,0.09),
    inset 6px 0 18px rgba(120,90,40,0.10);
}

/* 封面文字层 */
.book-open__cover-inner {
  position: absolute;
  inset: 0;
  padding: 22px 18px 18px 26px;
  display: flex;
  flex-direction: column;
  color: var(--book-accent, #C5A358);
  z-index: 1;
  pointer-events: none;
}
.book-open__volume {
  font-family: 'Cormorant Garamond', 'Noto Serif SC', serif;
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--book-accent, rgba(197,163,88,0.85));
  opacity: 0.85;
}
.book-open__bigchar {
  font-family: 'Noto Serif SC', serif;
  font-size: 5.2rem;
  font-weight: 700;
  line-height: 1;
  margin-top: 18px;
  background: var(--book-bigchar-grad,
    linear-gradient(135deg, #E8D293 0%, #C5A358 100%));
  -webkit-background-clip: text;
          background-clip: text;
  -webkit-text-fill-color: transparent;
  align-self: flex-start;
}
.book-open__rule {
  width: 38px;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
  margin-top: 14px;
}
.book-open__title {
  margin-top: auto;
  font-family: 'Manrope', sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--book-accent, #C5A358);
  opacity: 0.92;
  /* 不要让长 slug 溢出 */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 落地阴影（独立 div，不跟着 3D 翻转）*/
.book-open__shadow {
  position: absolute;
  left: 8%; right: 8%;
  bottom: -14px;
  height: 22px;
  background: radial-gradient(ellipse at center,
    rgba(0,0,0,0.28) 0%,
    rgba(0,0,0,0.12) 45%,
    transparent 80%);
  filter: blur(4px);
  z-index: -1;
  transition: transform 0.6s ease, opacity 0.6s ease;
}
.book-open.is-fanned .book-open__shadow,
.book-open.is-opened .book-open__shadow {
  transform: scale(1.45, 1.05);
  opacity: 0.9;
}

/* ============================================================
   交互模型 —— Idle 浮动 + hover 两阶段翻开
   - idle：.book-open__stage 做 7s 缓动浮动循环
   - hover / focus-within 进入：JS 先加 .is-fanned（书页扇开），
     350ms 后加 .is-opened（书页落向两侧 + 封面完全翻平）
   - hover / focus 离开：JS 先摘 .is-opened（书页回到扇形），
     350ms 后摘 .is-fanned（书页合拢 + 封面合回）
   - 全部用 transition 过渡，browser 自动处理快速移入移出的中途反向
   ============================================================ */

/* 封面默认态 + 合拢过渡（700ms，较快）*/
.book-open__front-cover {
  /* transform 由 translateZ + rotateY 组成，默认合着 */
  transform: translateZ(var(--book-half-thickness)) rotateY(0deg);
  transition: transform 700ms cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* 每片书页的默认态 + 合拢过渡 */
.book-open__leaf {
  transform: translateZ(var(--leaf-z, 0px)) rotateY(0deg);
  transition: transform 350ms cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* 第一阶段：扇开 —— 10 片书页张成 -10° → -172° 扇面；封面同时开始翻开 */
.book-open.is-fanned .book-open__leaf {
  transform: translateZ(var(--leaf-z, 0px)) rotateY(var(--fan-angle, -90deg));
}
.book-open.is-fanned .book-open__front-cover,
.book-open.is-opened .book-open__front-cover {
  /* 翻开后封面退到 -half-thickness（z=-12），而不是停在 +half-thickness。
     原因：CSS transform 链右到左执行，translateZ 是在 rotateY 之后施加在
     world Z 轴上的。如果保留 +12，翻开后封面（连同其 ::before 内环衬，
     paper 实底色）会停在 world z=+12，盖住左半侧 idx 5–9 leaf 的页面内容
     （bigchar / subtitle 等扉页元素都被这层内环衬挡死）。
     改成 -half-thickness 后封面落在左半侧最深处，符合"封面是最先翻开、
     压在所有页之下"的物理直觉，左页内容随之露出。
     translateZ 的差值 24px 会和 rotateY 一起在 1050ms 内插值过渡 ——
     由于翻转过程中段封面是 edge-on（rotateY≈-90°），用户感知不到 Z 平移。 */
  transform: translateZ(calc(-1 * var(--book-half-thickness))) rotateY(-180deg);
  transition-duration: 1050ms;     /* 打开时封面转得比合拢慢一点 */
  transition-timing-function: cubic-bezier(0.6, 0.05, 0.35, 1);
}

/* 第二阶段：落向两侧 —— idx 0-4 回到 0°，idx 5-9 落到 -178° */
.book-open.is-opened .book-open__leaf {
  transform: translateZ(var(--leaf-z, 0px)) rotateY(var(--drop-angle, 0deg));
  transition-duration: 700ms;
  transition-timing-function: cubic-bezier(0.55, 0.0, 0.4, 1);
  transition-delay: var(--drop-delay, 0ms);  /* 中间先落、外侧后落，浪状节奏 */
}

/* ============================================================
   idle 浮动 —— 与 hero 的 .book-3d::keyframes book-float 气质一致
   stage 的 transform 由动画控制；cover / leaf 的 transform 在各自的
   局部坐标系里独立计算，所以浮动不会干扰翻开
   ============================================================ */
.book-open__stage {
  animation: book-open-float 7s ease-in-out infinite;
  will-change: transform;
}

@keyframes book-open-float {
  0%, 100% {
    transform: rotateX(var(--book-rx)) rotateZ(var(--book-rz));
  }
  50% {
    transform:
      rotateX(calc(var(--book-rx) - 3deg))
      rotateZ(var(--book-rz))
      translate3d(0, -16px, 0);
  }
}

/* ============================================================
   书架内部尺寸适配（不污染 .book-open 默认尺寸）
   ============================================================ */
.bookshelf__slot .book-open {
  --book-w: 188px;
  --book-h: 264px;
  width: 100%;
  max-width: var(--book-w);
  /* 默认位置右偏 14px —— 给翻开时 leaf/cover 向左延展留出空间，
     闭合状态下书本略偏右落定，打开时向左摊开更平衡 */
  transform: translateX(14px);
}

/* ============================================================
   Reduced motion：跳过浮动 + 跳过所有翻书过渡
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .book-open__stage {
    animation: none;
    transform: rotateX(var(--book-rx)) rotateZ(var(--book-rz));
  }
  .book-open__front-cover,
  .book-open__leaf,
  .book-open__shadow {
    transition: none !important;
  }
}