/* ============================================================
   经典讲读 · 目录页视觉
   与《史记》讲读对齐：宣纸、墨色、朱砂印章、楷书
   ============================================================ */

:root {
  --paper:       #f6efde;
  --paper-deep:  #ece1c5;
  --paper-edge:  #d8c896;
  --ink:         #1d1916;
  --ink-soft:    #4a4036;
  --ink-light:   #6b6258;
  --ink-fade:    #8a7e6f;

  --vermilion:   #b3322a;
  --indigo:      #2c5a8a;
  --purple:      #6f4c89;
  --ochre:       #ad7e1a;
  --jade:        #4d7a4b;
  --crimson:     #8a1f1f;

  --gold-line:   #c0982b;
  --gold-bg:     #fbeeb888;

  --shadow-1:    0 2px 8px rgba(60, 40, 10, 0.08);
  --shadow-2:    0 8px 28px rgba(60, 40, 10, 0.14);

  --serif-zh:    "Noto Serif SC", "Songti SC", "STSong", "SimSun", "Source Han Serif SC", "Source Han Serif CN", serif;
  --kai-zh:      "Ma Shan Zheng", "STKaiti", "KaiTi", "Kaiti SC", "楷体", var(--serif-zh);
  --sans-zh:     "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body {
  margin: 0; padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-zh);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

body {
  background-image:
    radial-gradient(circle at 20% 30%, rgba(180, 140, 60, 0.05) 0, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(140, 90, 30, 0.04) 0, transparent 40%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
  min-height: 100vh;
}

a { color: var(--crimson); text-decoration: none; border-bottom: 1px dotted transparent; transition: 0.15s; }
a:hover { border-bottom-color: var(--crimson); color: #5a1010; }

::selection { background: var(--gold-bg); color: var(--ink); }

ruby { ruby-align: center; }
rt {
  font-family: var(--sans-zh);
  font-size: 0.55em;
  color: var(--ink-light);
  letter-spacing: 0;
  font-weight: 400;
  user-select: none;
}

/* ---------- 导航 ---------- */
.nav-bar {
  display: flex; justify-content: space-between; align-items: center;
  gap: 18px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 8px 24px;
  background: rgba(255, 250, 232, 0.85);
  border-bottom: 1px solid var(--paper-edge);
  font-family: var(--kai-zh);
  letter-spacing: 0.2em;
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(6px);
}
.nav-bar a { color: var(--ink-soft); padding: 2px 4px; }
.nav-bar a:hover { color: var(--crimson); }
.nav-bar .home { font-size: 16px; color: var(--crimson); }
.nav-bar .center { font-size: 14px; color: var(--ink-fade); }

/* ---------- 页眉 ---------- */
.hero {
  text-align: center;
  padding: 56px 24px 28px;
  background:
    radial-gradient(ellipse at center, rgba(179, 50, 42, 0.06), transparent 60%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
  border-bottom: 2px solid var(--paper-edge);
  position: relative;
}
.hero .top-seal {
  display: inline-block;
  width: 80px; height: 80px;
  background: var(--crimson);
  color: var(--paper);
  line-height: 1.2;
  padding: 14px;
  border-radius: 4px;
  font-family: var(--kai-zh);
  font-size: 22px;
  letter-spacing: 0.1em;
  box-shadow: var(--shadow-2);
  transform: rotate(-3deg);
  margin-bottom: 20px;
}
.hero h1 {
  font-family: var(--serif-zh);
  font-size: 56px;
  letter-spacing: 0.5em;
  margin: 12px 0 4px 0.5em;
  color: var(--ink);
  font-weight: 600;
}
.hero .h-sub {
  font-family: var(--kai-zh);
  font-size: 17px;
  letter-spacing: 0.4em;
  color: var(--ink-soft);
  margin: 6px 0;
}
.hero .h-author {
  font-size: 14px;
  color: var(--ink-light);
  letter-spacing: 0.5em;
  margin-top: 10px;
}
.hero .h-tagline {
  margin: 18px auto 0;
  max-width: 600px;
  font-family: var(--kai-zh);
  font-size: 15px;
  color: var(--ink-light);
  line-height: 2;
  letter-spacing: 0.1em;
}

.stats {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 28px;
  margin: 24px auto 6px;
  font-family: var(--kai-zh);
}
.stat { text-align: center; min-width: 90px; }
.stat .num {
  display: block;
  font-family: var(--serif-zh);
  font-size: 32px;
  color: var(--crimson);
  font-weight: 600;
  line-height: 1;
}
.stat .label {
  font-size: 13px;
  color: var(--ink-fade);
  letter-spacing: 0.3em;
  margin-top: 4px;
}

/* ---------- 序言 ---------- */
.intro {
  max-width: 920px;
  margin: 32px auto 24px;
  padding: 0 24px;
  font-family: var(--serif-zh);
  font-size: 16px;
  line-height: 2;
  color: var(--ink-soft);
  text-align: justify;
}
.intro p { margin: 12px 0; }
.intro strong { color: var(--crimson); }

/* ---------- 速览目录 ---------- */
.quick-nav {
  max-width: 920px;
  margin: 22px auto 0;
  padding: 14px 22px;
  background:
    linear-gradient(180deg, rgba(255, 250, 232, 0.7), rgba(236, 225, 197, 0.45));
  border: 1px solid var(--paper-edge);
  border-radius: 6px;
  box-shadow: 0 1px 4px rgba(60, 30, 10, 0.05);
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}
.quick-nav .qn-title {
  font-family: var(--serif-zh);
  font-size: 16px;
  letter-spacing: 0.45em;
  color: var(--crimson);
  border-right: 1px dashed var(--paper-edge);
  padding-right: 18px;
  padding-left: 4px;
  flex-shrink: 0;
  font-weight: 600;
  position: relative;
}
.quick-nav .qn-title::before {
  content: "❖";
  margin-right: 8px;
  color: var(--ochre);
  font-size: 13px;
}
.quick-nav .qn-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  flex: 1;
}
.quick-nav .qn-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 14px;
  border: 1px solid var(--paper-edge);
  border-radius: 20px;
  background: rgba(255, 250, 232, 0.85);
  font-family: var(--kai-zh);
  font-size: 14px;
  letter-spacing: 0.18em;
  color: var(--ink-soft);
  text-decoration: none;
  transition: all 0.18s ease;
}
.quick-nav .qn-list a:hover {
  background: var(--crimson);
  border-color: var(--crimson);
  color: var(--paper);
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(138, 31, 31, 0.22);
}
.quick-nav .qn-no {
  font-family: var(--serif-zh);
  font-size: 12px;
  color: var(--ink-fade);
  font-weight: 600;
  letter-spacing: 0;
}
.quick-nav .qn-list a:hover .qn-no { color: rgba(255, 250, 232, 0.78); }
.quick-nav .qn-num {
  font-family: var(--serif-zh);
  font-size: 12px;
  color: var(--crimson);
  margin-left: 1px;
  letter-spacing: 0;
}
.quick-nav .qn-list a:hover .qn-num { color: var(--paper); }

/* ---------- 全书总叙 ---------- */
.book-summary {
  max-width: 920px;
  margin: 26px auto 30px;
  padding: 28px 32px 24px;
  background:
    linear-gradient(180deg, rgba(255, 250, 232, 0.55), rgba(236, 225, 197, 0.35));
  border: 1px solid var(--paper-edge);
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(60, 30, 10, 0.05);
  font-family: var(--serif-zh);
  color: var(--ink);
  line-height: 1.95;
}
.book-summary h2 {
  font-family: var(--serif-zh);
  text-align: center;
  font-size: 24px;
  letter-spacing: 0.5em;
  margin: 0 0 6px 0.5em;
  color: var(--crimson);
  font-weight: 600;
}
.book-summary .bs-sub {
  text-align: center;
  font-family: var(--kai-zh);
  font-size: 13px;
  color: var(--ink-fade);
  letter-spacing: 0.4em;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--paper-edge);
}
.book-summary h3 {
  font-family: var(--kai-zh);
  font-size: 17px;
  color: var(--crimson);
  letter-spacing: 0.2em;
  margin: 22px 0 8px;
  padding-left: 10px;
  border-left: 4px solid var(--crimson);
}
.book-summary p {
  font-size: 15px;
  margin: 8px 0;
  text-align: justify;
  text-indent: 2em;
}
.book-summary blockquote {
  margin: 10px 0 10px 1.5em;
  padding: 6px 14px;
  border-left: 3px solid var(--ochre);
  background: rgba(173, 126, 26, 0.06);
  font-family: var(--kai-zh);
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.85;
}
.book-summary blockquote .who {
  display: block;
  font-size: 12.5px;
  color: var(--ink-fade);
  letter-spacing: 0.2em;
  margin-bottom: 2px;
}
.book-summary b { color: var(--crimson); }
.book-summary .closing {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--paper-edge);
  text-align: center;
  font-family: var(--kai-zh);
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: 0.25em;
  text-indent: 0;
}

/* ---------- 筛选栏 ---------- */
.filter-bar {
  max-width: 1200px;
  margin: 8px auto 16px;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}
.filter-bar .tabs {
  display: flex; gap: 6px; flex-wrap: wrap;
}
.filter-bar .tab {
  font-family: var(--kai-zh);
  font-size: 14px;
  letter-spacing: 0.2em;
  padding: 6px 14px;
  background: rgba(255, 250, 232, 0.6);
  border: 1px solid var(--paper-edge);
  color: var(--ink-soft);
  border-radius: 20px;
  cursor: pointer;
}
.filter-bar .tab.active {
  background: var(--crimson);
  color: var(--paper);
  border-color: var(--crimson);
}
.filter-bar input.search {
  font-family: var(--serif-zh);
  font-size: 14px;
  padding: 6px 12px;
  border: 1px solid var(--paper-edge);
  border-radius: 4px;
  background: rgba(255, 250, 232, 0.7);
  color: var(--ink);
  width: 220px;
}
.filter-bar input.search:focus { outline: 2px solid var(--ochre); }

/* ---------- 章节区块 ---------- */
.section-block {
  max-width: 1200px;
  margin: 36px auto;
  padding: 0 24px;
}
.section-block.hidden { display: none; }

.section-title {
  font-family: var(--serif-zh);
  font-size: 28px;
  letter-spacing: 0.4em;
  color: var(--crimson);
  text-align: center;
  margin: 24px 0 6px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--crimson);
  position: relative;
}
.section-title small {
  display: block;
  font-family: var(--kai-zh);
  font-size: 14px;
  letter-spacing: 0.3em;
  color: var(--ink-fade);
  margin-top: 6px;
}

.chap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.chap-card {
  display: block;
  padding: 14px 16px;
  background: rgba(255, 250, 232, 0.7);
  border: 1px solid var(--paper-edge);
  border-left: 4px solid var(--crimson);
  border-radius: 4px;
  transition: 0.2s;
  position: relative;
}
.chap-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  background: rgba(255, 248, 220, 0.95);
  border-left-color: var(--crimson);
}
.chap-card.hidden { display: none; }
.chap-card .no {
  font-family: var(--kai-zh);
  font-size: 11px;
  color: var(--ink-fade);
  letter-spacing: 0.15em;
}
.chap-card .ti {
  display: block;
  margin: 4px 0 2px;
  font-family: var(--serif-zh);
  font-size: 17px;
  color: var(--ink);
  letter-spacing: 0.08em;
}
.chap-card .meta {
  display: block;
  font-family: var(--sans-zh);
  font-size: 11.5px;
  color: var(--ink-fade);
  line-height: 1.7;
}

/* ---------- 页脚 ---------- */
footer, .site-foot {
  text-align: center;
  padding: 32px 24px;
  font-family: var(--kai-zh);
  font-size: 13px;
  color: var(--ink-fade);
  letter-spacing: 0.3em;
  border-top: 1px solid var(--paper-edge);
}

/* ============================================================
   总门户（经典讲读首页）
   ============================================================ */
.lobby-hero {
  text-align: center;
  padding: 78px 24px 38px;
  background:
    radial-gradient(ellipse at top, rgba(173, 126, 26, 0.10), transparent 65%),
    linear-gradient(180deg, var(--paper) 0%, var(--paper-deep) 100%);
  border-bottom: 2px solid var(--paper-edge);
}
.lobby-hero .top-seal {
  display: inline-block;
  width: 92px; height: 92px;
  background: var(--crimson);
  color: var(--paper);
  line-height: 1.15;
  padding: 14px 8px;
  border-radius: 4px;
  font-family: var(--kai-zh);
  font-size: 26px;
  letter-spacing: 0.12em;
  box-shadow: var(--shadow-2);
  transform: rotate(-3deg);
  margin-bottom: 22px;
}
.lobby-hero h1 {
  font-family: var(--serif-zh);
  font-size: 64px;
  letter-spacing: 0.6em;
  margin: 12px 0 6px 0.6em;
  color: var(--ink);
  font-weight: 600;
}
.lobby-hero .h-sub {
  font-family: var(--kai-zh);
  font-size: 18px;
  letter-spacing: 0.5em;
  color: var(--ink-soft);
  margin: 8px 0;
}
.lobby-hero .h-tagline {
  margin: 24px auto 0;
  max-width: 700px;
  font-family: var(--kai-zh);
  font-size: 15.5px;
  color: var(--ink-light);
  line-height: 2;
  letter-spacing: 0.1em;
}

.shelf {
  max-width: 1180px;
  margin: 48px auto 24px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}
.book-card {
  position: relative;
  background:
    linear-gradient(180deg, rgba(255, 250, 232, 0.85), rgba(236, 225, 197, 0.55));
  border: 1px solid var(--paper-edge);
  border-radius: 6px;
  padding: 32px 26px 28px;
  box-shadow: var(--shadow-1);
  transition: transform 0.2s, box-shadow 0.2s;
  text-decoration: none;
  color: var(--ink);
  border-bottom: none;
  display: flex;
  flex-direction: column;
  min-height: 360px;
}
.book-card.available:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
  border-color: var(--gold-line);
}
.book-card .seal {
  display: inline-block;
  width: 56px; height: 56px;
  background: var(--crimson);
  color: var(--paper);
  line-height: 1.1;
  padding: 10px 6px;
  border-radius: 3px;
  font-family: var(--kai-zh);
  font-size: 18px;
  letter-spacing: 0.1em;
  text-align: center;
  box-shadow: var(--shadow-1);
  transform: rotate(-2deg);
  margin-bottom: 14px;
}
.book-card[data-book="易经"] .seal { background: #2f6f5e; }
.book-card[data-book="道德经"] .seal { background: var(--ochre); }
.book-card[data-book="庄子"] .seal { background: var(--indigo); }
.book-card[data-book="金刚经"] .seal { background: var(--purple); }
.book-card[data-book="诗经"] .seal { background: #3a6b5e; }
.book-card[data-book="唐诗"] .seal { background: #9a6a2e; }
.book-card[data-book="论语"] .seal { background: var(--vermilion); }
.book-card h2 {
  font-family: var(--serif-zh);
  font-size: 30px;
  letter-spacing: 0.35em;
  color: var(--ink);
  margin: 8px 0 4px 0.35em;
  font-weight: 600;
}
.book-card .author {
  font-family: var(--kai-zh);
  font-size: 13px;
  letter-spacing: 0.35em;
  color: var(--ink-fade);
  margin-bottom: 12px;
}
.book-card p.lede {
  font-size: 14.5px;
  color: var(--ink-soft);
  line-height: 1.95;
  margin: 8px 0 14px;
}
.book-card .stats {
  display: flex;
  gap: 16px;
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--paper-edge);
  font-family: var(--kai-zh);
  font-size: 13px;
  color: var(--ink-fade);
  letter-spacing: 0.15em;
}
.book-card .stats b { color: var(--ink-soft); font-weight: 500; }
.book-card .badge-status {
  position: absolute;
  top: 14px;
  right: 14px;
  font-family: var(--kai-zh);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  padding: 3px 9px;
  border-radius: 11px;
  background: var(--ochre);
  color: var(--paper);
  border: 1px solid var(--ochre);
}

.lobby-note {
  max-width: 920px;
  margin: 56px auto 0;
  padding: 28px 32px 24px;
  background:
    linear-gradient(180deg, rgba(255, 250, 232, 0.55), rgba(236, 225, 197, 0.35));
  border: 1px solid var(--paper-edge);
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(60, 30, 10, 0.05);
  font-family: var(--serif-zh);
  color: var(--ink);
  line-height: 1.95;
}
.lobby-note h3 {
  font-family: var(--kai-zh);
  font-size: 17px;
  color: var(--crimson);
  letter-spacing: 0.3em;
  margin: 0 0 12px;
  padding-left: 10px;
  border-left: 4px solid var(--crimson);
}
.lobby-note p {
  font-size: 15px;
  margin: 8px 0;
  text-align: justify;
  text-indent: 2em;
}
.lobby-note b { color: var(--crimson); }
.lobby-note .closing {
  text-indent: 0;
  text-align: center;
  margin-top: 18px;
  font-family: var(--kai-zh);
  color: var(--ink-fade);
  letter-spacing: 0.3em;
}

.lobby-footer {
  margin-top: 56px;
  padding: 18px 0;
  text-align: center;
  font-family: var(--kai-zh);
  font-size: 13px;
  color: var(--ink-fade);
  letter-spacing: 0.3em;
  border-top: 1px dashed var(--paper-edge);
}

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .quick-nav { flex-direction: column; align-items: stretch; padding: 14px; }
  .quick-nav .qn-title {
    border-right: none;
    border-bottom: 1px dashed var(--paper-edge);
    padding: 0 0 8px;
    text-align: center;
  }
  .hero h1 { font-size: 40px; letter-spacing: 0.35em; margin-left: 0.35em; }
  .lobby-hero h1 { font-size: 44px; letter-spacing: 0.4em; margin-left: 0.4em; }
}