/* ===== 手帐拟物风 ===== */
@font-face {
  font-family: "LXGW WenKai Screen";
  src: url("fonts/LXGWWenKaiScreen-subset.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
:root {
  --bg: #F5F0E8;          /* 暖米白纸底 */
  --card: #FAF7F2;        /* 卡片纸 */
  --kraft: #D9C7B0;       /* 牛皮纸 */
  --ink: #3A322B;         /* 深灰褐墨字 */
  --ink-2: #5D534A;       /* 次级文字 */
  --muted: #8A7F72;       /* 弱文字 */
  --accent: #A8553D;      /* 锈红强调 */
  --accent-soft: #F0E4DE; /* 锈红浅底 */
  --line: #E0D8CF;        /* 分隔线 */
  --dot: #D5C9B8;         /* 噪点 */
  --tape: #F2D9A8;        /* 胶带黄 */
  --note: #F9F0D9;        /* 便签黄 */
  --shadow: rgba(58, 50, 43, 0.08);
  --sans: "LXGW WenKai Screen", "霞鹜文楷 屏幕阅读版", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }

body {
  background-color: var(--bg);
  background-image:
    radial-gradient(rgba(140, 120, 90, 0.035) 1px, transparent 1px),
    repeating-linear-gradient(0deg, transparent, transparent 4px, rgba(150, 130, 100, 0.018) 5px);
  background-size: 5px 5px, 100% 5px;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  min-height: 100vh;
  padding: 0 20px 60px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button { font-family: var(--sans); cursor: pointer; }
[hidden] { display: none !important; }

/* ---------- 头部 ---------- */
.site-header {
  position: relative;
  text-align: center;
  padding: 64px 0 20px;
}
.top-actions {
  position: absolute;
  top: 24px;
  right: 0;
  display: flex;
  gap: 10px;
}
.top-btn {
  background: var(--card);
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 15px;
  letter-spacing: 0.04em;
  transition: background-color 0.16s ease, border-color 0.16s ease;
}
.top-btn:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.site-title {
  font-size: clamp(24px, 4.8vw, 44px);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--ink);
  position: relative;
  display: inline-block;
}
.site-title::after {
  content: '';
  position: absolute;
  left: 4%;
  bottom: -8px;
  width: 92%;
  height: 7px;
  background: var(--accent);
  border-radius: 3px;
  opacity: 0.45;
  transform: rotate(-0.6deg);
}
.site-sub {
  margin-top: 12px;
  font-size: 15px;
  color: var(--muted);
  letter-spacing: 0.08em;
}
.site-stat {
  margin-top: 10px;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.12em;
}

/* ---------- 书架视图（默认） ---------- */
.shelf-view {
  max-width: 2000px;
  margin: 40px auto 0;
  padding: 0 8px;
}
.shelf-layout {
  display: flex;
  gap: 28px;
  align-items: flex-start;
}
.shelf-main {
  flex: 1;
  min-width: 0;
}
.filter-toggle {
  display: none;
}
.filter-sidebar-head {
  display: none;
}
.filter-mask {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 46, 0.4);
  z-index: 250;
}
.filter-sidebar {
  width: 220px;
  flex: 0 0 auto;
  position: sticky;
  top: 20px;
  align-self: flex-start;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  padding-right: 4px;
}
.filter-group {
  margin-bottom: 22px;
}
.filter-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.06em;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
  margin-bottom: 10px;
}
.depth-bar {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.cat-bar {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.cat-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--ink);
  border: none;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 14px;
  letter-spacing: 0.02em;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.cat-btn:hover { background: var(--accent-soft); color: var(--accent); }
.cat-btn.active {
  background: var(--accent);
  color: #fff;
}

.shelf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 14px;
}
@media (min-width: 900px) {
  .shelf-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 18px;
  }
}
.shelf-book {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  transform: rotate(var(--tilt, 0deg));
  box-shadow: 0 2px 6px rgba(58, 50, 43, 0.06), 0 8px 20px rgba(58, 50, 43, 0.08);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.shelf-book:nth-child(4n) { --tilt: -0.8deg; }
.shelf-book:nth-child(4n+1) { --tilt: 0.6deg; }
.shelf-book:nth-child(4n+3) { --tilt: 0.3deg; }
.shelf-book:hover {
  transform: rotate(var(--tilt, 0deg)) translateY(-4px);
  box-shadow: 0 4px 10px rgba(58, 50, 43, 0.1), 0 14px 32px rgba(58, 50, 43, 0.14);
  border-color: var(--accent);
}
.shelf-book::before {
  content: '';
  position: absolute;
  top: -9px;
  left: 50%;
  transform: translateX(-50%) rotate(-2deg);
  width: 56px;
  height: 20px;
  background: linear-gradient(to right, rgba(242, 217, 168, 0.65), rgba(232, 208, 176, 0.9), rgba(242, 217, 168, 0.65));
  box-shadow: 0 1px 2px rgba(58, 50, 43, 0.12);
  z-index: 2;
}
.shelf-book.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.shelf-cover-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background: #f0ece5;
  border-radius: 9px 9px 0 0;
}
.shelf-hover {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.92);
  opacity: 0;
  transition: opacity 0.22s ease;
  display: flex;
  align-items: center;
  padding: 16px 14px;
}
.shelf-book:hover .shelf-hover {
  opacity: 1;
}
.shelf-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.shelf-info {
  padding: 14px 16px 16px;
}
.shelf-book .b-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.shelf-book .b-author {
  font-size: 14px;
  color: var(--muted);
  margin-top: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.shelf-book .b-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
}
.shelf-book .b-cat {
  display: inline-block;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 5px;
  padding: 2px 8px;
}
.shelf-book .b-count {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.shelf-hover .b-intro {
  font-size: 14px;
  color: var(--ink);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 9;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- 书摘视图 ---------- */
.quotes-view {
  max-width: 2000px;
  margin: 28px auto 0;
}
.book-intro {
  position: relative;
  margin-bottom: 28px;
}
.book-intro .top-btn {
  position: absolute;
  top: 0;
}
.book-intro #back-shelf { left: 0; }
.book-intro #btn-demo-book { right: 0; }
.bi-body {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  padding-top: 42px;
}
.bi-cover {
  width: 130px;
  height: 180px;
  border-radius: 8px;
  object-fit: cover;
  flex: 0 0 auto;
  box-shadow: 0 6px 20px rgba(58, 50, 43, 0.2);
  background: #eef3f8;
}
.bi-info { flex: 1; min-width: 0; }
.bi-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
  margin-bottom: 6px;
}
.bi-author {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}
.bi-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.bi-count { font-size: 12px; color: var(--muted); }
.bi-intro {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.quotes-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.q-title {
  font-size: 17px;
  color: var(--ink);
  letter-spacing: 0.03em;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chapter-group { margin-bottom: 36px; }
.chapter-group:last-child { margin-bottom: 0; }
.chapter-title {
  display: inline-block;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  background: var(--note);
  padding: 6px 18px;
  border-radius: 4px;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
  line-height: 1.4;
  transform: rotate(-1deg);
  box-shadow: 0 2px 5px rgba(58, 50, 43, 0.12);
}
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  grid-auto-flow: dense;
}
.card.wide2 {
  grid-column: span 2;
}
.card.wide3 {
  grid-column: span 3;
}
.card.wide4 {
  grid-column: span 4;
}

.chapter-toggle {
  display: none;
}
.chapter-index-head {
  display: none;
}
.chapter-mask {
  position: fixed;
  inset: 0;
  background: rgba(26, 26, 46, 0.4);
  z-index: 250;
}
.chapter-layout {
  display: flex;
  gap: 28px;
  align-items: flex-start;
}
.chapter-main { flex: 1; min-width: 0; }
.chapter-index {
  width: 200px;
  flex: 0 0 auto;
  position: sticky;
  top: 20px;
  align-self: flex-start;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  padding-right: 4px;
}
.ch-link {
  display: block;
  padding: 5px 12px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border-radius: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ch-link:hover { background: var(--accent-soft); color: var(--accent); }
.chapter-group { scroll-margin-top: 20px; }

/* ---------- 主卡片 ---------- */
.card {
  position: relative;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 26px 28px;
  background-image:
    radial-gradient(circle 2px at 14px 14px, var(--dot) 98%, transparent),
    radial-gradient(circle 2px at calc(100% - 14px) 14px, var(--dot) 98%, transparent),
    radial-gradient(circle 2px at 14px calc(100% - 14px), var(--dot) 98%, transparent),
    radial-gradient(circle 2px at calc(100% - 14px) calc(100% - 14px), var(--dot) 98%, transparent);
  box-shadow: 0 2px 6px rgba(58, 50, 43, 0.05), 0 8px 18px rgba(58, 50, 43, 0.07);
  transition: box-shadow 0.25s ease, background-color 0.25s ease, border-color 0.25s ease;
}
.card:hover {
  background-color: var(--accent-soft);
  border-color: var(--accent);
  box-shadow: 0 4px 10px rgba(58, 50, 43, 0.08), 0 12px 26px rgba(58, 50, 43, 0.12);
}

.chapter {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}
.quote-text {
  font-size: 20px;
  line-height: 1.75;
  color: var(--ink);
  font-weight: 400;
  text-align: left;
  letter-spacing: 0.01em;
}
.quote-text::before { content: "\201C"; color: var(--accent); }
.quote-text::after  { content: "\201D"; color: var(--accent); }

.divider {
  border: 0;
  border-top: 1px solid var(--line);
  width: 58%;
  margin: 20px auto 18px;
}
.card-foot { display: flex; align-items: center; gap: 12px; }
.cover {
  width: 40px; height: 40px;
  border-radius: 6px;
  object-fit: cover;
  flex: 0 0 auto;
  background: var(--accent-soft);
}
.meta { min-width: 0; }
.book {
  font-size: 15px;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sub {
  font-size: 12px;
  color: var(--muted);
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.read-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 12px;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.05em;
  opacity: 0.7;
}
.read-link:hover { opacity: 1; text-decoration: underline; }

/* ---------- 演示模式 ---------- */
.demo-mask {
  position: fixed;
  inset: 0;
  background: var(--bg);
  background-image: radial-gradient(rgba(58, 50, 43, 0.04) 1px, transparent 1px);
  background-size: 6px 6px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 24px 28px 20px;
}
.demo-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: 0 0 auto;
}
.demo-title {
  font-size: 16px;
  color: var(--ink);
  letter-spacing: 0.06em;
}
.demo-close {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 14px;
}
.demo-close:hover { background: var(--accent-soft); color: var(--accent); }

.demo-stage {
  flex: 1 1 auto;
  display: grid;
  gap: 22px;
  align-content: center;
  margin: 18px 0;
  min-height: 0;
  transition: opacity 0.5s ease;
}
.demo-stage.fading { opacity: 0; }

/* 布局模板：3 张大小不一自由组合 */
.demo-stage.layout-a { grid-template-columns: 1.5fr 1fr; grid-template-rows: 1fr 1fr; }
.demo-stage.layout-a .demo-card:first-child { grid-row: 1 / 3; }
.demo-stage.layout-b { grid-template-columns: 1fr 1.6fr 1fr; }
.demo-stage.layout-c { grid-template-columns: 1fr 1fr 1fr; }
.demo-stage.layout-d { grid-template-columns: 1fr 1fr; grid-template-rows: 1.4fr 1fr; }
.demo-stage.layout-d .demo-card:first-child { grid-column: 1 / 3; }
/* 1 / 2 张时的兜底布局 */
.demo-stage.single { grid-template-columns: minmax(0, 720px); justify-content: center; }
.demo-stage.double { grid-template-columns: 1fr 1fr; }

.demo-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 32px 34px;
  overflow: hidden;
  background-image:
    radial-gradient(circle 2px at 16px 16px, var(--dot) 98%, transparent),
    radial-gradient(circle 2px at calc(100% - 16px) 16px, var(--dot) 98%, transparent),
    radial-gradient(circle 2px at 16px calc(100% - 16px), var(--dot) 98%, transparent),
    radial-gradient(circle 2px at calc(100% - 16px) calc(100% - 16px), var(--dot) 98%, transparent);
}
.demo-card .d-quote {
  font-size: clamp(20px, 2.6vw, 32px);
  line-height: 1.6;
  color: var(--ink);
  display: -webkit-box;
  -webkit-line-clamp: 10;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.demo-card .d-quote.demo-md { font-size: clamp(18px, 2.2vw, 26px); }
.demo-card .d-quote.demo-sm { font-size: clamp(16px, 1.9vw, 22px); }
.demo-card .d-quote.demo-xs { font-size: clamp(14px, 1.6vw, 18px); }
.demo-card .d-quote::before { content: "\201C"; color: var(--accent); }
.demo-card .d-quote::after  { content: "\201D"; color: var(--accent); }
.demo-card .d-foot-mini {
  justify-content: flex-start;
}
.demo-card .d-date {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.05em;
}
.demo-card .d-divider {
  border: 0;
  border-top: 1px solid var(--line);
  width: 50%;
  margin: 20px 0 16px;
}
.demo-card .d-foot { display: flex; align-items: center; gap: 12px; }
.demo-card .d-cover {
  width: 40px; height: 40px;
  border-radius: 5px;
  object-fit: cover;
  background: var(--accent-soft);
}
.demo-card .d-book {
  font-size: 15px;
  color: var(--accent);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.demo-card .d-sub {
  font-size: 12px;
  color: var(--muted);
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 演示范围选择 */
.demo-scope {
  flex: 0 0 auto;
  max-height: 34vh;
  overflow-y: auto;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  margin-bottom: 12px;
}
.demo-scope .scope-hint {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.05em;
  margin-bottom: 10px;
  text-align: center;
}
.demo-scope .shelf-grid { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
.demo-scope .shelf-book { flex-direction: row; align-items: center; }
.demo-scope .shelf-cover-wrap { width: 44px; height: 62px; aspect-ratio: auto; flex: 0 0 auto; }
.demo-scope .shelf-info { padding: 8px 10px; border-top: none; flex: 1; min-width: 0; }
.demo-scope .b-meta { display: none; }
.demo-scope .b-author { display: none; }
.demo-scope .shelf-hover { display: none; }

.demo-controls {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding-top: 6px;
}
.demo-btn {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 14px;
}
.demo-btn:hover { background: var(--accent-soft); color: var(--accent); }
.demo-btn.demo-play { width: 44px; padding: 7px 0; font-size: 16px; }
.demo-speed-label { font-size: 13px; color: var(--muted); }
.demo-speed-val { font-size: 13px; color: var(--accent); min-width: 34px; }
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 180px;
  height: 4px;
  border-radius: 2px;
  background: var(--line);
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--card);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--card);
  cursor: pointer;
}

/* ---------- 演示倒计时 ---------- */
.demo-countdown {
  position: absolute;
  right: 16px;
  bottom: 16px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cd-ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}
.cd-bg {
  fill: none;
  stroke: var(--line);
  stroke-width: 3;
}
.cd-fg {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 163.36;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1s linear;
}
.cd-text {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  z-index: 1;
}

/* ---------- 加载 / 错误 ---------- */
.loading, .error {
  text-align: center;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: 0.1em;
  padding: 40px 0;
  grid-column: 1 / -1;
}
.error { color: var(--accent); }

/* ---------- 页脚 ---------- */
.site-footer {
  text-align: center;
  margin-top: 40px;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
}
.stamp {
  display: inline-block;
  border: 2px solid var(--accent);
  border-radius: 50%;
  padding: 4px 14px;
  color: var(--accent);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.15em;
  transform: rotate(-8deg);
  opacity: 0.65;
  margin-right: 12px;
}
.dot-sep { margin: 0 8px; color: var(--dot); }

/* ---------- 堆叠开关 ---------- */
.filter-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}
.filter-title-row .filter-title {
  margin-bottom: 0;
  border-left: 4px solid var(--accent);
  padding-left: 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.06em;
}
.stack-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.stack-switch input { display: none; }
.switch-track {
  position: relative;
  width: 34px;
  height: 18px;
  background: var(--line);
  border-radius: 9px;
  transition: background 0.2s;
}
.switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 2px rgba(58, 50, 43, 0.25);
  transition: left 0.2s;
}
.stack-switch input:checked + .switch-track { background: var(--accent); }
.stack-switch input:checked + .switch-track .switch-thumb { left: 18px; }
.switch-label { font-size: 12px; color: var(--muted); }

/* ---------- 堆叠书架 ---------- */
.shelf-grid.stack-mode {
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 52px 34px;
}
.stack-group {
  cursor: pointer;
  animation: stackIn 0.35s ease backwards;
}
@keyframes stackIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.stack {
  position: relative;
  aspect-ratio: 3 / 4;
  margin-bottom: 8px;
}
.st-cover {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 4px;
  box-shadow: 0 2px 6px rgba(58, 50, 43, 0.14);
  transition: transform 0.2s ease;
}
.st-cover:nth-child(1) { transform: rotate(-5deg) translate(-8px, 3px); }
.st-cover:nth-child(2) { transform: rotate(3deg) translate(7px, 2px); }
.st-cover:nth-child(3) { transform: rotate(-1deg); z-index: 3; }
.stack-group:hover .st-cover:nth-child(1) { transform: rotate(-8deg) translate(-13px, 5px); }
.stack-group:hover .st-cover:nth-child(2) { transform: rotate(5deg) translate(10px, 3px); }
.stack-group:hover .st-cover:nth-child(3) { transform: rotate(-2deg) translateY(-2px); }
.stack-info { text-align: center; }
.stack-cat {
  font-size: 13px;
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.stack-count {
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}

/* ---------- 堆叠内联展开 ---------- */
.stack-expand {
  grid-column: 1 / -1;
  background: rgba(250, 247, 242, 0.85);
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 8px;
}
.stack-expand-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 26px;
}

/* ---------- 更新进度弹窗 ---------- */
.upd-mask {
  position: fixed;
  inset: 0;
  background: rgba(58, 50, 43, 0.4);
  z-index: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.upd-modal {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  width: 420px;
  max-width: 92vw;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 12px 40px rgba(58, 50, 43, 0.25);
}
.upd-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.upd-head button {
  border: none;
  background: transparent;
  font-size: 20px;
  cursor: pointer;
  color: var(--muted);
  line-height: 1;
  padding: 2px 6px;
}
.upd-list {
  overflow-y: auto;
  flex: 1;
  min-height: 100px;
}
.upd-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--muted);
  border-bottom: 1px dashed var(--line);
}
.upd-item:last-child { border-bottom: none; }
.upd-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex: 0 0 auto;
  background: var(--line);
}
.upd-item.doing { color: var(--ink); }
.upd-item.doing .upd-dot {
  background: var(--accent);
  animation: updPulse 1s ease infinite;
}
.upd-item.done { color: var(--muted); }
.upd-item.done .upd-dot { background: var(--accent); opacity: 0.45; }
.upd-item.error { color: var(--accent); }
.upd-item.error .upd-dot { background: var(--accent); }
@keyframes updPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
.upd-foot {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 12px;
}
.upd-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 13px;
  cursor: pointer;
}
.upd-btn:hover { opacity: 0.9; }

/* ---------- 创意生成弹窗 ---------- */
.gen-mask {
  position: fixed;
  inset: 0;
  background: rgba(58, 50, 43, 0.45);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.gen-modal {
  position: relative;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  width: 900px;
  max-width: 94vw;
  height: 82vh;
  max-height: 820px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 16px 50px rgba(58, 50, 43, 0.3);
  overflow: hidden;
}
.gen-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}
.gen-head button {
  border: none;
  background: transparent;
  font-size: 20px;
  cursor: pointer;
  color: var(--muted);
  line-height: 1;
  padding: 2px 6px;
}
.gen-tabs {
  display: flex;
  gap: 4px;
  padding: 0 20px;
  border-bottom: 1px solid var(--line);
}
.gen-tab {
  border: none;
  background: transparent;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}
.gen-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}
.gen-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.gen-toolbar {
  padding: 12px 20px;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 10px;
}
.gen-toolbar input {
  flex: 1;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  background: var(--card);
  color: var(--ink);
}
.gen-toolbar input:focus { border-color: var(--accent); }
.gen-body {
  flex: 1;
  display: flex;
  min-height: 0;
}
.gen-books {
  width: 240px;
  flex: 0 0 auto;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  padding: 8px;
}
.gen-book {
  padding: 8px 12px;
  font-size: 14px;
  color: var(--ink);
  cursor: pointer;
  border-radius: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.gen-book:hover { background: var(--accent-soft); }
.gen-book.active { background: var(--accent); color: #fff; }
.gen-quotes {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}
.gen-quote {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  color: var(--ink);
  line-height: 1.6;
}
.gen-quote.checked { border-color: var(--accent); background: var(--accent-soft); }
.gq-check {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border: 1px solid var(--line);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #fff;
  margin-top: 3px;
}
.gen-quote.checked .gq-check { background: var(--accent); border-color: var(--accent); }
.gq-text { flex: 1; min-width: 0; }
.gen-foot {
  padding: 12px 20px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--muted);
}
.gen-btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 8px 22px;
  font-size: 14px;
  cursor: pointer;
}
.gen-btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
.gen-hint {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  padding: 30px 0;
}
.gen-gallery {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 18px;
  align-content: start;
}
.gen-img-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.gen-img-card img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 9px 9px 0 0;
  cursor: zoom-in;
}
.gen-img-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  font-size: 12px;
}
.gen-img-actions a { color: var(--accent); text-decoration: none; }
.gen-img-actions button {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
}
.gen-progress {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px 24px;
  box-shadow: 0 8px 30px rgba(58, 50, 43, 0.2);
  z-index: 10;
  min-width: 240px;
}
.gen-progress-text {
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 10px;
  text-align: center;
}
.gen-progress-bar {
  height: 6px;
  background: var(--line);
  border-radius: 3px;
  overflow: hidden;
}
#gen-progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.3s ease;
}

/* ---------- 风格选择 ---------- */
.gen-styles {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px 22px;
  box-shadow: 0 12px 40px rgba(58, 50, 43, 0.25);
  z-index: 12;
  width: 480px;
  max-width: 90%;
}
.gen-styles-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  text-align: center;
  margin-bottom: 16px;
}
.gen-styles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.gen-style {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 10px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.gen-style:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.gs-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}
.gs-desc {
  font-size: 11px;
  color: var(--muted);
  margin-top: 4px;
  line-height: 1.4;
}
.gen-styles-cancel {
  display: block;
  margin: 14px auto 0;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
}
.gen-styles-cancel:hover { color: var(--ink); }

/* ---------- 图片预览 lightbox ---------- */
.lb-mask {
  position: fixed;
  inset: 0;
  background: rgba(30, 26, 22, 0.88);
  z-index: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
}
.lb-mask img {
  max-width: 90vw;
  max-height: 82vh;
  border-radius: 8px;
  box-shadow: 0 12px 50px rgba(0, 0, 0, 0.5);
}
.lb-bar {
  display: flex;
  gap: 14px;
  align-items: center;
}
.lb-bar a {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 999px;
  padding: 8px 22px;
  font-size: 14px;
}
.lb-bar button {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 999px;
  padding: 8px 22px;
  font-size: 14px;
  cursor: pointer;
}

/* ---------- 右键菜单 ---------- */
.ctx-menu {
  position: fixed;
  z-index: 1000;
  min-width: 128px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
  padding: 6px;
}
.ctx-item {
  padding: 9px 14px;
  font-size: 14px;
  color: var(--ink);
  cursor: pointer;
  border-radius: 6px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.ctx-item:hover {
  background: var(--accent);
  color: #fff;
}

/* ---------- 划线操作浮层 ---------- */
.qa-mask {
  position: fixed;
  inset: 0;
  background: rgba(30, 26, 22, 0.5);
  z-index: 700;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.qa-sheet {
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border-radius: 16px 16px 0 0;
  padding: 20px 20px 24px;
  box-shadow: 0 -8px 40px rgba(58, 50, 43, 0.25);
  animation: qaUp 0.25s ease;
}
@keyframes qaUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}
.qa-quote {
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  padding: 12px 14px;
  background: var(--bg);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  margin-bottom: 16px;
  max-height: 140px;
  overflow-y: auto;
}
.qa-actions {
  display: flex;
  gap: 12px;
}
.qa-btn {
  flex: 1;
  padding: 11px 0;
  border-radius: 999px;
  font-size: 15px;
  cursor: pointer;
  border: 1px solid var(--line);
}
.qa-gen {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.qa-copy {
  background: var(--card);
  color: var(--ink);
}
.qa-cancel {
  display: block;
  width: 100%;
  margin-top: 12px;
  padding: 11px 0;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 15px;
  cursor: pointer;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .shelf-layout { flex-direction: column; }
  .filter-toggle {
    display: block;
    margin-bottom: 14px;
    background: var(--card);
    color: var(--accent);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 7px 18px;
    font-size: 14px;
    letter-spacing: 0.04em;
  }
  .filter-sidebar {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    max-width: 85vw;
    background: var(--card);
    z-index: 300;
    padding: 16px 20px;
    transform: translateX(100%);
    transition: transform 0.25s ease;
    box-shadow: -4px 0 20px rgba(26, 26, 46, 0.12);
    overflow-y: auto;
    max-height: none;
  }
  .filter-sidebar.open { transform: translateX(0); }
  .filter-sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
    font-size: 16px;
    font-weight: 700;
    color: var(--ink);
  }
  .filter-sidebar-head button {
    border: none;
    background: transparent;
    font-size: 20px;
    cursor: pointer;
    color: var(--muted);
    line-height: 1;
    padding: 2px 6px;
  }
  .filter-group { margin-bottom: 18px; }
  .depth-bar, .cat-bar { flex-direction: column; gap: 2px; }
  .cat-btn { width: 100%; text-align: left; }
  .chapter-layout { flex-direction: column; }
  .chapter-toggle {
    display: block;
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 200;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    border: none;
    font-size: 13px;
    box-shadow: 0 4px 14px rgba(58, 50, 43, 0.3);
  }
  .chapter-index {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 260px;
    max-width: 80vw;
    background: var(--card);
    z-index: 300;
    padding: 16px 18px;
    transform: translateX(100%);
    transition: transform 0.25s ease;
    box-shadow: -4px 0 20px rgba(26, 26, 46, 0.12);
    overflow-y: auto;
    max-height: none;
    display: block;
  }
  .chapter-index.open { transform: translateX(0); }
  .chapter-index-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
    font-size: 16px;
    font-weight: 700;
    color: var(--ink);
  }
  .chapter-close {
    border: none;
    background: transparent;
    font-size: 20px;
    cursor: pointer;
    color: var(--muted);
    line-height: 1;
    padding: 2px 6px;
  }
  .ch-link {
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}
@media (max-width: 600px) {
  .shelf-info { padding: 10px 10px 12px; }
  .shelf-book .b-title { font-size: 13px; }
  .shelf-book .b-author { display: none; }
  .shelf-hover { display: none; }
  .shelf-book .b-cat { display: none; }
  .shelf-book .b-meta { margin-top: 6px; }
  .shelf-book .b-count { font-size: 10px; }
}
@media (max-width: 1500px) { .chapter-grid { grid-template-columns: repeat(3, 1fr); } .card.wide4 { grid-column: span 3; } }
@media (max-width: 1100px) { .chapter-grid { grid-template-columns: repeat(2, 1fr); } .card.wide3, .card.wide4 { grid-column: span 2; } }
@media (max-width: 800px) {
  .chapter-grid { grid-template-columns: repeat(2, 1fr); }
  .demo-stage.layout-b { grid-template-columns: 1fr 1fr; }
  .demo-stage.layout-b .demo-card:first-child { grid-column: 1 / 3; }
  .demo-stage.layout-c { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .chapter-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .card.wide2, .card.wide3, .card.wide4 { grid-column: span 2; }
  .quote-text { font-size: 15px; }
  .card { padding: 16px 14px; }
  .demo-card { padding: 20px 18px; }
  .demo-card .d-quote { -webkit-line-clamp: 7; }
  .top-actions { position: static; justify-content: center; margin-bottom: 18px; }
  .demo-stage.layout-a,
  .demo-stage.layout-b,
  .demo-stage.layout-c,
  .demo-stage.layout-d,
  .demo-stage.double { grid-template-columns: repeat(2, 1fr); grid-template-rows: auto; }
  .demo-stage.layout-a .demo-card:first-child,
  .demo-stage.layout-b .demo-card:first-child,
  .demo-stage.layout-d .demo-card:first-child { grid-row: auto; grid-column: auto; }
  .demo-card { grid-column: span 1; }
  .demo-card.demo-wide { grid-column: span 2; }
  .demo-stage.single { grid-template-columns: 1fr; }
  .demo-stage { gap: 12px; }
  .demo-controls { flex-wrap: wrap; }
  input[type="range"] { width: 120px; }
}

/* ---------- 登录遮罩 ---------- */
.login-mask {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.login-box {
  background: var(--card);
  border-radius: 12px;
  padding: 36px 32px;
  text-align: center;
  box-shadow: 0 10px 40px rgba(0,0,0,0.08);
  max-width: 360px;
  width: 100%;
}
.login-title {
  font-size: 15px;
  color: var(--ink);
  margin-bottom: 20px;
  letter-spacing: 0.03em;
  line-height: 1.6;
}
.login-box input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  margin-bottom: 14px;
  outline: none;
}
.login-box input:focus { border-color: var(--accent); }
.login-err { color: var(--accent); font-size: 13px; margin-top: 10px; min-height: 18px; }

/* ---------- 洞察视图 ---------- */
.insight-view { max-width: 860px; margin: 28px auto 0; }
.insight-head { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }

/* 4 大数字 */
.insight-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 26px;
}
.stat-num {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 22px 16px;
  text-align: center;
}
.stat-num .n {
  display: block;
  font-size: 36px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.1;
}
.stat-num .l {
  display: block;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.05em;
  margin-top: 5px;
}

/* 洞察区块 */
.insight-block {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 26px 28px;
  margin-bottom: 18px;
}
.insight-block h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 18px;
  padding-left: 12px;
  border-left: 6px solid var(--accent);
  letter-spacing: 0.03em;
}

/* 条形图 */
.bars { display: flex; flex-direction: column; gap: 10px; }
.bar-row { display: flex; align-items: center; gap: 12px; }
.bar-label {
  flex: 0 0 56px;
  font-size: 13px;
  color: var(--muted);
  text-align: right;
  white-space: nowrap;
}
.bar-track {
  flex: 1;
  height: 14px;
  background: var(--bg);
  border-radius: 7px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--tape), var(--accent));
  border-radius: 7px;
  min-width: 2px;
}
.bar-val {
  flex: 0 0 44px;
  font-size: 13px;
  color: var(--ink);
  font-weight: 600;
}

/* 深度分布 */
.depth-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.depth-item {
  text-align: center;
  padding: 18px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg);
}
.depth-item .d-n {
  display: block;
  font-size: 30px;
  font-weight: 700;
  color: var(--accent);
}
.depth-item .d-l {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

/* TOP 列表 */
.rank { list-style: none; }
.rank li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
}
.rank li:last-child { border-bottom: none; }
.rank .rk-t {
  flex: 1;
  font-size: 14px;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.rank .rk-cat {
  font-size: 11px;
  color: var(--accent);
  background: var(--bg);
  border-radius: 5px;
  padding: 2px 8px;
}
.rank .rk-n {
  font-size: 13px;
  color: var(--muted);
  font-weight: 600;
  white-space: nowrap;
}

/* 画像 */
.portrait .p-item { margin-bottom: 20px; }
.portrait .p-item:last-child { margin-bottom: 0; }
.portrait h3 {
  font-size: 16px;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 8px;
}
.portrait p { font-size: 14px; color: var(--ink); line-height: 1.8; }

/* 建议 */
.advice { list-style: none; counter-reset: adv; }
.advice li {
  position: relative;
  padding: 12px 0 12px 36px;
  font-size: 14px;
  color: var(--ink);
  line-height: 1.8;
  border-bottom: 1px dashed var(--line);
}
.advice li:last-child { border-bottom: none; }
.advice li::before {
  content: counter(adv);
  counter-increment: adv;
  position: absolute;
  left: 0;
  top: 12px;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 600px) {
  .insight-stats { grid-template-columns: repeat(2, 1fr); }
  .depth-row { grid-template-columns: 1fr; }
}

/* ---------- thinking timeline ---------- */
.thinking .t-item { margin-bottom: 26px; }
.thinking .t-item:last-child { margin-bottom: 0; }
.thinking .t-question {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}
.timeline {
  position: relative;
  border-left: 2px solid var(--line);
  margin-left: 6px;
}
.tl-item { position: relative; padding: 0 0 16px 16px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
}
.tl-year {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}
.tl-note {
  font-size: 14px;
  color: var(--ink);
  line-height: 1.8;
  margin-top: 2px;
}