@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;700&family=Noto+Sans+SC:wght@400;500&display=swap');

:root {
  --paper: #F7F4EE;
  --paper-dark: #EDE8DC;
  --ink: #1A1714;
  --ink-mid: #4A4540;
  --ink-light: #8A8278;
  --ink-faint: #C4BFB5;
  --vermilion: #C0392B;
  --vermilion-light: #FAEAE8;
  --vermilion-mid: #E8897F;
  --gold: #A0732A;
  --gold-light: #FAF0DC;
  --serif: 'Noto Serif SC', 'STSong', 'SimSun', serif;
  --sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 15px; line-height: 1.8; min-height: 100vh; }

/* NAV */
.site-nav { position: sticky; top: 0; z-index: 100; background: var(--paper); border-bottom: 1px solid var(--ink-faint); display: flex; align-items: center; justify-content: space-between; padding: 0 2rem; height: 56px; }
.nav-brand { font-family: var(--serif); font-size: 15px; color: var(--ink-light); letter-spacing: 0.15em; text-decoration: none; }
.nav-tabs { display: flex; gap: 0; }
.nav-tab { font-family: var(--serif); font-size: 14px; padding: 0 1.25rem; height: 56px; display: flex; align-items: center; cursor: pointer; border: none; background: none; color: var(--ink-light); letter-spacing: 0.08em; border-bottom: 2px solid transparent; transition: color 0.2s, border-color 0.2s; text-decoration: none; }
.nav-tab:hover { color: var(--ink); }
.nav-tab.active { color: var(--vermilion); border-bottom-color: var(--vermilion); }
.nav-tab.active-gold { color: var(--gold); border-bottom-color: var(--gold); }
.nav-right { display: flex; align-items: center; gap: 1.5rem; }
.nav-current { font-size: 13px; color: var(--ink-light); text-decoration: none; letter-spacing: 0.06em; transition: color 0.2s; }
.nav-current:hover { color: var(--ink); }
.nav-title { font-family: var(--serif); font-size: 15px; color: var(--ink-mid); letter-spacing: 0.1em; }
@media (max-width: 480px) { .nav-title { display: none; } }

/* HERO */
.poem-hero { background: var(--paper-dark); border-bottom: 1px solid var(--ink-faint); padding: 3.5rem 2rem 3rem; text-align: center; }
.hero-dynasty { font-size: 12px; letter-spacing: 0.3em; color: var(--ink-light); margin-bottom: 0.75rem; font-family: var(--sans); }
.hero-title { font-family: var(--serif); font-size: clamp(2rem, 5vw, 3.2rem); font-weight: 700; color: var(--ink); letter-spacing: 0.15em; margin-bottom: 0.5rem; }
.hero-author { font-family: var(--serif); font-size: 16px; color: var(--ink-mid); letter-spacing: 0.12em; }
.hero-tags { margin-top: 1.25rem; display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.tag { font-size: 12px; padding: 3px 12px; border-radius: 20px; letter-spacing: 0.05em; font-family: var(--sans); }
.tag-vermilion { background: var(--vermilion-light); color: var(--vermilion); }
.tag-gold { background: var(--gold-light); color: var(--gold); }

/* LAYOUT */
.content-wrap { max-width: 820px; margin: 0 auto; padding: 0 2rem 4rem; overflow-x: clip; }

/* SECTION */
.sec { padding: 2.5rem 0 0; border-top: 1px solid var(--ink-faint); margin-top: 2.5rem; }
.sec:first-child { border-top: none; margin-top: 0; padding-top: 2.5rem; }
.sec-label { font-size: 11px; letter-spacing: 0.25em; color: var(--ink-light); font-family: var(--sans); font-weight: 500; display: flex; align-items: center; gap: 10px; margin-bottom: 1.5rem; }
.sec-label::after { content: ''; flex: 1; height: 1px; background: var(--ink-faint); }

/* STATS */
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--ink-faint); border: 1px solid var(--ink-faint); border-radius: 4px; overflow: hidden; margin-bottom: 2rem; }
.stat-cell { background: var(--paper); padding: 1rem 1.25rem; text-align: center; }
.stat-cell .label { font-size: 11px; color: var(--ink-light); letter-spacing: 0.08em; margin-bottom: 4px; }
.stat-cell .value { font-family: var(--serif); font-size: 17px; font-weight: 700; color: var(--ink); }

/* POEM DISPLAY */
.poem-display { background: var(--paper-dark); border: 1px solid var(--ink-faint); border-radius: 4px; padding: 2.8rem 2rem 2.5rem; text-align: center; overflow-x: clip; }
.poem-preface { font-size: 13px; color: var(--ink-light); margin-bottom: 2rem; font-style: italic; letter-spacing: 0.03em; padding: 0 1rem; line-height: 1.7; }
.verse-block { display: flex; flex-direction: column; gap: 12px; }
.verse-stanza { display: flex; flex-direction: column; gap: 12px; }
.stanza-gap { height: 10px; }
.verse-line { display: flex; flex-wrap: wrap; justify-content: center; align-items: flex-start; gap: 0; padding-top: 4px; max-width: 100%; }
.char-unit { display: flex; flex-direction: column; align-items: center; width: 2.4rem; overflow: visible; }
.char-pinyin { font-size: 12px; color: var(--ink-light); line-height: 1; height: 22px; display: flex; align-items: flex-end; justify-content: center; font-family: Georgia, "Times New Roman", serif !important; letter-spacing: 0; overflow: visible; }
.char-hanzi { font-family: var(--serif); font-size: 22px; font-weight: 500; color: var(--ink); line-height: 1.4; }
.char-punct { font-family: var(--serif); font-size: 22px; color: var(--ink-faint); line-height: 1.4; width: 1.2rem; margin-top: 22px; }

/* PROSE PINYIN FLOW — full character-by-character pinyin for long-form prose; wraps naturally unlike fixed-width .verse-line */
.prose-pinyin-flow { display: flex; flex-wrap: wrap; align-items: flex-start; row-gap: 10px; margin-bottom: 1.9rem; padding-top: 4px; max-width: 100%; }
.prose-pinyin-flow:last-child { margin-bottom: 0; }
.poem-display .prose-pinyin-flow { justify-content: flex-start; text-align: left; }
.flow-indent { width: 2.4rem; flex-shrink: 0; }

/* PROSE ORIGINAL TEXT — for 骈文/古文长篇, pinyin annotated only on hard or polyphonic characters */
.prose-orig { font-family: var(--serif); font-size: 17px; line-height: 2.3; color: var(--ink); text-align: justify; letter-spacing: 0.02em; }
.prose-orig p { text-indent: 2em; margin-bottom: 1.15rem; }
.prose-orig p:last-child { margin-bottom: 0; }
.gloss { display: inline-flex; flex-direction: column; align-items: center; vertical-align: bottom; margin: 0 1px; }
.gloss-py { font-size: 11px; color: var(--ink-light); line-height: 1.1; font-family: Georgia, "Times New Roman", serif; }
.gloss-zi { font-family: var(--serif); font-size: 17px; color: var(--ink); line-height: 1.3; }
.prose-orig-poem { margin-top: 1.7rem; padding-top: 1.4rem; border-top: 1px dashed var(--ink-faint); text-align: center; }
.prose-orig-poem p { text-indent: 0; margin-bottom: 0.4rem; font-size: 17px; font-family: var(--serif); color: var(--ink); }

/* TRANSLATION */
.trans-table { width: 100%; border-collapse: collapse; table-layout: fixed; }
.trans-table tr { border-bottom: 1px solid var(--ink-faint); }
.trans-table tr:last-child { border-bottom: none; }
.trans-table td { padding: 0.85rem 0; vertical-align: top; font-size: 14px; }
.trans-orig { font-family: var(--serif); color: var(--ink); white-space: normal; overflow-wrap: break-word; word-break: break-word; padding-right: 20px; width: 38%; font-size: 15px; line-height: 1.85; }
.trans-zh { color: var(--ink-mid); line-height: 1.75; overflow-wrap: break-word; word-break: break-word; }

/* PROSE TRANSLATION — paragraph-paired layout for long 古文/骈文, avoids nowrap overflow */
.prose-trans { display: flex; flex-direction: column; gap: 1.15rem; }
.trans-pair { padding-bottom: 1.1rem; border-bottom: 1px solid var(--ink-faint); }
.trans-pair:last-child { border-bottom: none; padding-bottom: 0; }
.trans-pair-orig { font-family: var(--serif); font-size: 15.5px; color: var(--ink); line-height: 1.85; margin-bottom: 0.55rem; overflow-wrap: break-word; word-break: break-word; }
.trans-pair-zh { font-size: 13.5px; color: var(--ink-mid); line-height: 1.8; overflow-wrap: break-word; word-break: break-word; }

/* PROSE */
.prose { font-size: 14px; line-height: 1.95; color: var(--ink-mid); }
.prose p { margin-bottom: 0.9rem; }
.prose p:last-child { margin-bottom: 0; }
.prose em { color: var(--ink); font-style: normal; font-weight: 500; }

/* GRID */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.card { background: var(--paper-dark); border: 1px solid var(--ink-faint); border-radius: 4px; padding: 1rem 1.1rem; }
.card-title { font-size: 12px; font-weight: 500; color: var(--ink-light); margin-bottom: 7px; display: flex; align-items: center; gap: 6px; letter-spacing: 0.05em; }
.card-body { font-size: 13px; color: var(--ink-mid); line-height: 1.75; }
.card-body em { color: var(--ink); font-style: normal; font-weight: 500; }

/* PRONUNCIATION — 多音字与通假字 */
.pron-intro { font-size: 13px; line-height: 1.8; color: var(--ink-mid); margin-bottom: 1.5rem; padding: 0.85rem 1rem; border-radius: 4px; border-left: 3px solid var(--accent, var(--ink-light)); background: var(--paper-dark); }
.pron-group { margin-bottom: 1.75rem; }
.pron-group:last-child { margin-bottom: 0; }
.pron-group-title { font-size: 12px; font-weight: 600; letter-spacing: 0.12em; color: var(--accent, var(--ink)); margin-bottom: 0.85rem; }
.pron-list { display: flex; flex-direction: column; gap: 10px; }
.pron-item { display: grid; grid-template-columns: 42px 1fr; gap: 14px; align-items: start; padding: 0.95rem 1.05rem; background: var(--paper-dark); border: 1px solid var(--ink-faint); border-radius: 4px; }
.pron-char { font-family: var(--serif); font-size: 26px; font-weight: 700; color: var(--accent, var(--ink)); line-height: 1.2; text-align: center; padding-top: 2px; }
.pron-reading { font-size: 14px; color: var(--ink); margin-bottom: 6px; }
.pron-reading strong { font-family: var(--sans); font-size: 15px; font-weight: 600; color: var(--accent, var(--ink)); letter-spacing: 0.04em; }
.pron-tag { display: inline-block; font-size: 11px; color: var(--ink-light); background: var(--paper); border: 1px solid var(--ink-faint); border-radius: 3px; padding: 1px 7px; margin-left: 6px; letter-spacing: 0.04em; }
.pron-quote { font-family: var(--serif); font-size: 14px; color: var(--ink); line-height: 1.7; margin-bottom: 4px; }
.pron-quote em { font-style: normal; font-weight: 700; color: var(--accent, var(--ink)); }
.pron-desc { font-size: 12px; color: var(--ink-mid); line-height: 1.65; }

/* TEACHER */
.teacher-card { background: var(--paper); border: 1px solid var(--ink-faint); border-radius: 4px; padding: 1.1rem 1.2rem; }
.teacher-name { font-family: var(--serif); font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 2px; }
.teacher-role { font-size: 11px; color: var(--ink-light); letter-spacing: 0.06em; margin-bottom: 10px; }
.teacher-desc { font-size: 13px; color: var(--ink-mid); line-height: 1.75; }
.teacher-desc em { color: var(--ink); font-style: normal; font-weight: 500; }

/* TIMELINE */
.timeline { position: relative; padding-left: 22px; }
.timeline::before { content: ''; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 1px; background: var(--ink-faint); }
.tl-item { position: relative; margin-bottom: 1.5rem; }
.tl-item:last-child { margin-bottom: 0; }
.tl-dot { position: absolute; left: -19px; top: 5px; width: 9px; height: 9px; border-radius: 50%; border: 2px solid var(--paper); }
.dot-rise { background: #5DCAA5; }
.dot-peak { background: #E8B84A; }
.dot-fall { background: #D0674A; }
.dot-end  { background: #A0A098; }
.tl-year { font-size: 11px; color: var(--ink-light); letter-spacing: 0.06em; margin-bottom: 3px; }
.tl-title { font-size: 15px; font-weight: 500; color: var(--ink); font-family: var(--serif); margin-bottom: 4px; }
.tl-desc { font-size: 13px; color: var(--ink-mid); line-height: 1.75; }
.tl-desc em { color: var(--ink); font-style: normal; font-weight: 500; }

/* PROFILE */
.profile-row { display: flex; gap: 1.25rem; align-items: flex-start; margin-bottom: 1.75rem; }
.avatar { width: 60px; height: 60px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-family: var(--serif); font-size: 24px; font-weight: 700; flex-shrink: 0; border: 1px solid; }
.avatar-li { background: #EEF5FA; color: #0C447C; border-color: #B5D4F4; }
.avatar-su { background: var(--gold-light); color: var(--gold); border-color: #FAC775; }
.profile-name { font-family: var(--serif); font-size: 24px; font-weight: 700; color: var(--ink); letter-spacing: 0.1em; }
.profile-sub { font-size: 13px; color: var(--ink-light); margin-top: 4px; line-height: 1.6; }

/* LEGEND */
.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px solid var(--ink-faint); }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-light); }
.legend-dot { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; }

/* ANALYSIS */
.analysis-intro { border-left: 3px solid var(--vermilion); padding: 0.75rem 1.25rem; margin-bottom: 1.25rem; background: var(--vermilion-light); border-radius: 0 4px 4px 0; }
.analysis-intro p { font-size: 14px; color: var(--ink-mid); line-height: 1.85; margin: 0; }
.analysis-intro em { color: var(--ink); font-style: normal; font-weight: 500; }

/* INDEX SIDEBAR */
.index-sidebar { position: fixed; right: 1.5rem; top: 50%; transform: translateY(-50%); z-index: 200; display: flex; flex-direction: column; gap: 6px; background: var(--paper); border: 1px solid var(--ink-faint); border-radius: 8px; padding: 10px 8px; box-shadow: 0 2px 12px rgba(0,0,0,0.07); }
.index-sidebar-title { font-size: 10px; letter-spacing: 0.12em; color: var(--ink-faint); text-align: center; padding-bottom: 6px; border-bottom: 1px solid var(--ink-faint); margin-bottom: 2px; font-family: var(--sans); white-space: nowrap; }
.index-item { display: flex; align-items: center; gap: 7px; cursor: pointer; padding: 5px 8px; border-radius: 5px; transition: background 0.15s; text-decoration: none; white-space: nowrap; }
.index-item:hover { background: var(--paper-dark); }
.index-item.active { background: var(--paper-dark); }
.index-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ink-faint); flex-shrink: 0; transition: background 0.15s, transform 0.15s; }
.index-item.active .index-dot, .index-item:hover .index-dot { background: var(--accent, var(--vermilion)); transform: scale(1.3); }
.index-text { font-size: 11px; color: var(--ink-light); font-family: var(--sans); letter-spacing: 0.04em; }
.index-item.active .index-text, .index-item:hover .index-text { color: var(--ink); }
@media (max-width: 900px) { .index-sidebar { display: none; } }

/* INDEX TOOLBAR — 检索 + 排序 */
.index-toolbar { max-width: 820px; margin: 0 auto; padding: 2rem 2rem 0; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.index-search { flex: 1 1 240px; display: flex; align-items: center; gap: 8px; background: var(--paper); border: 1px solid var(--ink-faint); border-radius: 8px; padding: 0.55rem 0.9rem; transition: border-color 0.2s, box-shadow 0.2s; }
.index-search:focus-within { border-color: var(--vermilion); box-shadow: 0 0 0 3px var(--vermilion-light); }
.index-search-icon { color: var(--ink-light); font-size: 16px; line-height: 1; flex-shrink: 0; }
.index-search input { flex: 1; min-width: 0; border: none; background: none; outline: none; font-family: var(--sans); font-size: 14px; color: var(--ink); letter-spacing: 0.04em; }
.index-search input::placeholder { color: var(--ink-faint); }
.index-seg { display: inline-flex; border: 1px solid var(--ink-faint); border-radius: 8px; overflow: hidden; flex-shrink: 0; }
.seg-btn { font-family: var(--serif); font-size: 13px; padding: 0.5rem 1.1rem; border: none; background: var(--paper); color: var(--ink-light); cursor: pointer; letter-spacing: 0.08em; transition: color 0.2s, background 0.2s; }
.seg-btn + .seg-btn { border-left: 1px solid var(--ink-faint); }
.seg-btn:hover { color: var(--ink); }
.seg-btn.active { background: var(--vermilion); color: #fff; }
.index-empty { max-width: 820px; margin: 0 auto; text-align: center; color: var(--ink-light); font-family: var(--serif); font-size: 15px; letter-spacing: 0.08em; padding: 3rem 2rem 0; }

@media (max-width: 600px) {
  .index-toolbar { padding: 1.5rem 1rem 0; flex-direction: column; align-items: stretch; }
  .index-seg { justify-content: stretch; }
  .index-seg .seg-btn { flex: 1; }
}

/* FOOTER */
.site-footer { background: var(--paper-dark); border-top: 1px solid var(--ink-faint); text-align: center; padding: 2rem; font-size: 12px; color: var(--ink-faint); letter-spacing: 0.1em; font-family: var(--sans); }

/* RESPONSIVE */
@media (max-width: 600px) {
  .site-nav { padding: 0 1rem; }
  .poem-hero { padding: 2.5rem 1rem 2rem; }
  .content-wrap { padding: 0 1rem 3rem; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .grid2, .teacher-row-grid { grid-template-columns: 1fr; }
  .char-unit { width: 2rem; }
  .flow-indent { width: 2rem; }
  .char-hanzi { font-size: 19px; }
  .char-pinyin { font-size: 10px; font-family: Georgia, "Times New Roman", serif !important; }
  .trans-table tr { display: block; padding-bottom: 0.85rem; margin-bottom: 0.85rem; }
  .trans-table tr:last-child { margin-bottom: 0; padding-bottom: 0; }
  .trans-table td { display: block; width: 100% !important; padding: 0; }
  .trans-orig { padding-right: 0; padding-bottom: 0.45rem; }
  .profile-row { flex-direction: column; gap: 0.75rem; }
  .nav-brand { display: none; }
  .prose-orig { font-size: 15px; line-height: 2.1; }
  .gloss-zi { font-size: 15px; }
}