/* 《滕王阁序》逐字解析 — 古典中文阅读体验 */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600;700;900&family=ZCOOL+XiaoWei&family=Ma+Shan+Zheng&family=Long+Cang&display=swap');

:root {
  --font-serif: "Noto Serif SC", "Songti SC", "STSong", "宋体", serif;
  --font-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-brush: "Ma Shan Zheng", "Long Cang", "Noto Serif SC", serif;
  --seal-red: #a83232;
  --char-scale: 1;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  font-family: var(--font-serif);
  background: #1a1410;
  color: #2a1f15;
  font-feature-settings: "palt";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ============== PAPER TEXTURE (shared subtle noise) ============== */
.paper-noise {
  position: absolute; inset: 0;
  pointer-events: none;
  opacity: .35;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.4  0 0 0 0 0.3  0 0 0 0 0.2  0 0 0 0.18 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

/* ============== COVER ============== */
.cover {
  position: relative;
  min-height: 100vh;
  background: linear-gradient(180deg, #1d1812 0%, #2a1f15 40%, #3a2a1a 100%);
  color: #e8d8b8;
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  justify-items: center;
  overflow: hidden;
  padding: 80px 40px;
  /* decorative — don't let a long-press select it into an odd blue block */
  user-select: none;
  -webkit-user-select: none;
}
.cover::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 70% 30%, rgba(218,165,99,0.18), transparent 55%),
    radial-gradient(ellipse at 20% 80%, rgba(168,50,50,0.12), transparent 55%);
  pointer-events: none;
}
.cover-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 36px;
}
.cover-title {
  font-family: var(--font-display);
  /* the title itself should be selectable/copyable */
  user-select: text;
  -webkit-user-select: text;
  font-size: clamp(72px, 11vw, 168px);
  font-weight: 400;
  letter-spacing: 0.15em;
  margin: 0;
  color: #f3e3c3;
  text-shadow: 0 4px 30px rgba(0,0,0,0.5);
  writing-mode: vertical-rl;
  /* keep all four glyphs in one vertical column — never wrap to a 2nd column,
     even when the window is wide-but-short */
  white-space: nowrap;
  line-height: 1.05;
  /* +0.15em on top mirrors the trailing letter-spacing below the last
     glyph, so the column sits truly centred in its box (no bottom drift) */
  padding: calc(24px + 0.15em) 0 24px;
}
.cover-subtitle {
  font-family: var(--font-serif);
  font-size: 18px;
  letter-spacing: 0.6em;
  color: #c9a878;
  margin: 0;
  padding-left: 0.6em;
}
.cover-author {
  font-size: 16px;
  color: #b9966a;
  letter-spacing: 0.3em;
}
.cover-author span { color: #d9bc8e; margin: 0 0.4em; }
.cover-rule {
  width: 1px; height: 60px; background: linear-gradient(180deg, transparent, #c9a878, transparent);
}
.cover-meta {
  font-size: 13px; color: #8a7350;
  letter-spacing: 0.4em;
  margin-top: 8px;
}
.cover-seal {
  display: inline-block;
  width: 64px; height: 64px;
  border: 2px solid var(--seal-red);
  border-radius: 4px;
  color: var(--seal-red);
  font-family: var(--font-display);
  writing-mode: vertical-rl;
  text-align: center;
  font-size: 18px;
  line-height: 30px;
  padding: 6px 0;
  letter-spacing: 0;
  background: rgba(168,50,50,0.04);
  box-shadow: inset 0 0 0 1px rgba(168,50,50,0.4);
  transform: rotate(-2deg);
}

/* ============== SECTIONS ============== */
.section {
  position: relative;
  padding: 120px 0 100px;
  overflow: hidden;
}

.section-head {
  max-width: 1240px;
  margin: 0 auto 60px;
  padding: 0 60px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: end;
  gap: 32px;
}
.section-label {
  font-family: var(--font-display);
  font-size: 96px;
  font-weight: 400;
  line-height: 0.85;
  color: var(--ink-strong, #2a1f15);
  opacity: 0.55;
}
.section-titles { 
  border-bottom: 1px solid var(--rule, rgba(0,0,0,0.18));
  padding-bottom: 18px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 400;
  letter-spacing: 0.08em;
  margin: 0 0 8px;
  color: var(--ink-strong, #2a1f15);
}
.section-subtitle {
  font-size: 14px;
  letter-spacing: 0.4em;
  color: var(--ink-muted, rgba(0,0,0,0.55));
  margin: 0;
}
.section-num {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.5em;
  color: var(--ink-muted, rgba(0,0,0,0.5));
  padding-top: 8px;
}

/* ============== ITEM (one sentence) ============== */
.items {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 60px;
  display: flex;
  flex-direction: column;
  gap: 72px;
}
.item {
  display: grid;
  grid-template-columns: 52px 1fr;
  column-gap: 20px;
  align-items: start;
  border-radius: 4px;
  transition: background-color 0.45s ease;
}
.item.is-reading {
  background: color-mix(in srgb, var(--hover-bg, rgba(0,0,0,0.06)) 40%, transparent);
}

/* Per-item meta column (number) */
.item-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 8px;
  gap: 14px;
}
.item-num {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--accent, var(--seal-red));
  border: 1px solid var(--accent, var(--seal-red));
  padding: 4px 7px 5px;
  border-radius: 2px;
  background: var(--num-bg, rgba(255,255,255,0.25));
  line-height: 1;
}
.item-meta::after {
  content: "";
  display: block;
  width: 1px;
  flex: 1;
  background: linear-gradient(180deg, var(--rule-soft, rgba(0,0,0,0.12)), transparent 85%);
  min-height: 80px;
}

.item-body {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Word-by-word alignment grid */
.word-grid {
  display: grid;
  grid-template-columns: 76px 1fr;
  column-gap: 28px;
  row-gap: 2px;
  position: relative;
}
.word-grid::before {
  /* hairline rule sitting between the two columns */
  content: "";
  position: absolute;
  top: 8px; bottom: 8px;
  left: 76px;
  margin-left: 14px;
  width: 1px;
  background: linear-gradient(180deg,
    transparent,
    var(--rule, rgba(0,0,0,0.22)) 8%,
    var(--rule, rgba(0,0,0,0.22)) 92%,
    transparent);
  pointer-events: none;
}

/* Each <div class="row"> wraps a pair; display: contents lets its children
   participate in the parent grid while the wrapper still receives :hover. */
.row { display: contents; }

.row-vert {
  font-family: var(--font-brush);
  font-size: calc(40px * var(--char-scale));
  line-height: 1.05;
  color: var(--ink-strong);
  text-align: center;
  padding: 6px 6px 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  transition: background-color .25s ease, color .25s ease, transform .25s ease;
  border-radius: 3px;
  position: relative;
  min-height: 1px;
}
.row-vert .char {
  display: block;
  padding: 0;
}
.row-vert .char.punct {
  color: var(--ink-muted);
  font-size: 0.5em;
  line-height: 0.6;
  margin: -0.15em 0 0.2em;
  opacity: 0.7;
}

/* Trivial rows (之/于/而/其/以/兮 + punctuation): no hover, slightly faded */
.row-trivial .row-vert {
  font-size: calc(30px * var(--char-scale));
  color: var(--ink-muted);
  opacity: 0.7;
  padding: 4px 6px 4px;
}
.row-trivial:hover .row-vert,
.row-trivial:hover .row-def {
  background: transparent;
  border-left-color: transparent;
  color: var(--ink-muted);
}
.row-trivial .row-def::before { display: none !important; }
.row-trivial .row-vert .char.punct {
  font-size: 0.6em;
}

.row-def {
  padding: 10px 16px 10px 18px;
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
  transition: background-color .25s ease, border-color .25s ease;
  align-self: start;
  position: relative;
  min-height: 1px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.row-def.is-empty { padding: 0; min-height: 0; }
.row-def .d {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-body);
}
.row-def .w-py {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 17px;
  color: var(--accent);
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}
.row-def .w-py ruby rb {
  font-family: var(--font-brush);
  font-size: 20px;
  color: var(--ink-strong);
}
.row-def .w-py ruby rt {
  font-family: var(--font-serif);
  font-size: 11px;
  color: var(--accent);
  font-weight: 400;
  letter-spacing: 0;
  opacity: 0.95;
}

/* Meaningful rows are interactive (tap / click to pin a pair) */
.row:not(.row-trivial) .row-vert,
.row:not(.row-trivial) .row-def {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

/* Highlight the paired left+right.
   Hover is gated to real pointers so touch devices don't get a stuck
   :hover after tapping; touch relies on the .is-active class instead. */
.row:not(.row-trivial).is-active .row-vert {
  background: var(--hover-bg, rgba(0,0,0,0.06));
  color: var(--ink-emph);
}
.row:not(.row-trivial).is-active .row-def {
  background: var(--hover-bg, rgba(0,0,0,0.06));
  border-left-color: var(--accent);
}
.row:not(.row-trivial).is-active .row-def .w { color: var(--accent); }
/* active pair reads as "pinned": ring on the chars + bolder connector */
.row:not(.row-trivial).is-active .row-vert {
  box-shadow: inset 0 0 0 1px var(--accent);
}
.row:not(.row-trivial).is-active .row-def::before {
  opacity: 0.95;
  transform: translateX(0) scale(1.1);
}

@media (hover: hover) and (pointer: fine) {
  .row:not(.row-trivial):hover .row-vert {
    background: var(--hover-bg, rgba(0,0,0,0.06));
    color: var(--ink-emph);
  }
  .row:not(.row-trivial):hover .row-def {
    background: var(--hover-bg, rgba(0,0,0,0.06));
    border-left-color: var(--accent);
  }
  .row:not(.row-trivial):hover .row-def .w {
    color: var(--accent);
  }
  .row:not(.row-trivial):hover .row-def::before {
    opacity: 0.85;
    transform: translateX(0);
  }
}
/* connector dot at the rule line on hover/active */
.row-def::before {
  content: "";
  position: absolute;
  left: -15px;
  top: 22px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0;
  transform: translateX(-3px);
  transition: opacity .25s ease, transform .25s ease;
}

/* The 题 (preface title) item — large display, no alignment grid */
.item-title .word-grid { display: block; }
.item-title .word-grid::before { display: none; }
.item-title .preface-display {
  display: flex;
  gap: 56px;
  align-items: stretch;
}
.item-title .preface-vert {
  font-family: var(--font-display);
  font-size: 56px;
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: 0.12em;
  color: var(--ink-emph);
  padding: 12px 18px;
  border-right: 1px solid var(--rule);
  line-height: 1.1;
}
.item-title .preface-defs {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 36px;
  align-content: center;
}
.item-title .preface-def {
  padding: 8px 4px;
  border-bottom: 1px dotted var(--rule-soft);
}
.item-title .preface-def .w {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--ink-strong);
  margin-bottom: 2px;
}
.item-title .preface-def .d {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-body);
}

/* Combined summary (meaning + allusion + note) — placed inside the LAST
   def's right cell so it tucks up under the def text rather than waiting
   for the (possibly tall) chars column to end. */
.summary {
  margin: 12px 0 0;
  padding: 10px 0 0 0;
  border-top: 1px dashed var(--rule, rgba(0,0,0,0.2));
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-body);
}
.summary .sect {
  display: block;
  padding: 6px 0;
}
.summary .sect + .sect {
  border-top: 1px dotted var(--rule-soft, rgba(0,0,0,0.12));
}
.summary .tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 2px;
  padding: 2px 6px 2px 9px;
  margin-right: 10px;
  vertical-align: 2px;
  line-height: 1;
}
.summary .sect.meaning { color: var(--ink-strong); }
.summary .sect.note {
  font-size: 13px;
  color: var(--ink-muted);
  font-style: italic;
}
.summary .sect.note .tag {
  color: var(--ink-muted);
  border-color: var(--ink-muted);
}

/* Allusion: detailed multi-row layout */
.summary .sect.allusion .tag {
  color: var(--accent-2);
  border-color: var(--accent-2);
}
.summary .a-head {
  display: inline;
  font-family: var(--font-display);
  font-size: 16px;
  letter-spacing: 0.05em;
  color: var(--ink-strong);
  margin-right: 12px;
}
.summary .a-meta {
  display: inline;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  margin-right: 4px;
}
.summary .a-meta + .a-meta::before {
  content: "·";
  margin: 0 6px;
  color: var(--ink-muted);
  opacity: 0.5;
}
.summary .a-body {
  display: grid;
  grid-template-columns: max-content 1fr;
  column-gap: 12px;
  row-gap: 3px;
  margin-top: 4px;
  padding-left: 4px;
  font-size: 13.5px;
  line-height: 1.75;
}
.summary .a-body dt {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--accent-2);
  padding-top: 2px;
  white-space: nowrap;
}
.summary .a-body dd {
  margin: 0;
  color: var(--ink-body);
}



/* ============== MOOD: parchment (Section I) ============== */
.section.mood-parchment {
  background: 
    radial-gradient(ellipse at 80% 10%, rgba(180,120,60,0.12), transparent 60%),
    radial-gradient(ellipse at 10% 90%, rgba(120,80,40,0.1), transparent 60%),
    linear-gradient(180deg, #f1e3c4 0%, #e8d4ad 60%, #ddc596 100%);
  --ink-strong: #3a2614;
  --ink-body: #4a3823;
  --ink-emph: #6b2c1f;
  --ink-muted: rgba(58,38,20,0.55);
  --rule: rgba(58,38,20,0.25);
  --rule-soft: rgba(58,38,20,0.15);
  --accent: #a83232;
  --accent-2: #8b5a2b;
  --block-bg: rgba(255,250,235,0.55);
  --block-bg-2: rgba(245,225,195,0.55);
  --hover-bg: rgba(168,50,50,0.10);
  --num-bg: rgba(255,250,235,0.4);
}

/* ============== MOOD: celadon (Section II) ============== */
.section.mood-celadon {
  background:
    radial-gradient(ellipse at 20% 20%, rgba(180,210,180,0.4), transparent 60%),
    radial-gradient(ellipse at 90% 80%, rgba(140,180,160,0.3), transparent 60%),
    linear-gradient(180deg, #d8e3d2 0%, #c4d4c0 60%, #aec5b0 100%);
  --ink-strong: #1f3a2c;
  --ink-body: #2c4a3a;
  --ink-emph: #5a3826;
  --ink-muted: rgba(31,58,44,0.55);
  --rule: rgba(31,58,44,0.25);
  --rule-soft: rgba(31,58,44,0.12);
  --accent: #8b3a2e;
  --accent-2: #4a6b5e;
  --block-bg: rgba(255,255,250,0.45);
  --block-bg-2: rgba(220,235,220,0.45);
  --hover-bg: rgba(139,58,46,0.10);
  --num-bg: rgba(255,255,250,0.4);
}

/* ============== MOOD: autumn-purple (Section III) ============== */
.section.mood-autumn-purple {
  background:
    radial-gradient(ellipse at 30% 0%, rgba(244,200,140,0.45), transparent 55%),
    radial-gradient(ellipse at 100% 60%, rgba(120,80,130,0.35), transparent 55%),
    linear-gradient(170deg, #f7e6c4 0%, #e9c8b2 30%, #b89bb5 70%, #6b4a7a 100%);
  --ink-strong: #2a1838;
  --ink-body: #3a2548;
  --ink-emph: #6a2a4a;
  --ink-muted: rgba(42,24,56,0.55);
  --rule: rgba(42,24,56,0.22);
  --rule-soft: rgba(42,24,56,0.12);
  --accent: #b03a3a;
  --accent-2: #6a2a4a;
  --block-bg: rgba(255,250,240,0.5);
  --block-bg-2: rgba(235,220,230,0.5);
  --hover-bg: rgba(176,58,58,0.10);
  --num-bg: rgba(255,250,240,0.42);
}

/* ============== MOOD: vermilion (Section IV) ============== */
.section.mood-vermilion {
  background:
    radial-gradient(ellipse at 80% 20%, rgba(200,80,50,0.18), transparent 55%),
    radial-gradient(ellipse at 10% 100%, rgba(150,60,40,0.12), transparent 55%),
    linear-gradient(180deg, #ecd4b4 0%, #e2bf99 60%, #c89878 100%);
  --ink-strong: #4a1f14;
  --ink-body: #5a2c1a;
  --ink-emph: #8b2a1a;
  --ink-muted: rgba(74,31,20,0.55);
  --rule: rgba(74,31,20,0.25);
  --rule-soft: rgba(74,31,20,0.13);
  --accent: #9a2a1a;
  --accent-2: #7a4a28;
  --block-bg: rgba(255,250,240,0.5);
  --block-bg-2: rgba(245,225,200,0.5);
  --hover-bg: rgba(154,42,26,0.10);
  --num-bg: rgba(255,250,240,0.42);
}

/* ============== MOOD: sunset (Section V — 落霞秋水) ============== */
.section.mood-sunset {
  background:
    radial-gradient(ellipse at 70% 25%, rgba(255,200,100,0.55), transparent 50%),
    radial-gradient(ellipse at 25% 70%, rgba(220,110,80,0.35), transparent 50%),
    linear-gradient(170deg, #f6d27a 0%, #e9a672 25%, #d97e6a 50%, #a87890 75%, #6b8db5 100%);
  --ink-strong: #2a1a0a;
  --ink-body: #3a2a18;
  --ink-emph: #7a2a1a;
  --ink-muted: rgba(42,26,10,0.55);
  --rule: rgba(42,26,10,0.25);
  --rule-soft: rgba(42,26,10,0.13);
  --accent: #a82a1a;
  --accent-2: #6b4a2a;
  --block-bg: rgba(255,248,225,0.5);
  --block-bg-2: rgba(248,225,190,0.5);
  --hover-bg: rgba(168,42,26,0.10);
  --num-bg: rgba(255,248,225,0.45);
}

/* ============== MOOD: wine (Section VI) ============== */
.section.mood-wine {
  background:
    radial-gradient(ellipse at 20% 10%, rgba(180,120,60,0.18), transparent 55%),
    radial-gradient(ellipse at 90% 90%, rgba(100,40,80,0.3), transparent 55%),
    linear-gradient(180deg, #3a1d28 0%, #2a1424 60%, #1a0e1c 100%);
  --ink-strong: #f1d9b5;
  --ink-body: #d8bf99;
  --ink-emph: #f4c361;
  --ink-muted: rgba(241,217,181,0.55);
  --rule: rgba(241,217,181,0.22);
  --rule-soft: rgba(241,217,181,0.12);
  --accent: #d9a44a;
  --accent-2: #b8806a;
  --block-bg: rgba(255,240,210,0.06);
  --block-bg-2: rgba(255,220,180,0.08);
  --hover-bg: rgba(217,164,74,0.14);
  --num-bg: rgba(255,240,210,0.06);
}

/* ============== MOOD: deep-night (Section VII) ============== */
.section.mood-deep-night {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(150,170,220,0.18), transparent 50%),
    radial-gradient(ellipse at 20% 100%, rgba(80,100,170,0.18), transparent 55%),
    linear-gradient(180deg, #1a2440 0%, #11192c 60%, #07091a 100%);
  --ink-strong: #e8dcc0;
  --ink-body: #c9bea0;
  --ink-emph: #f4e6b8;
  --ink-muted: rgba(232,220,192,0.55);
  --rule: rgba(232,220,192,0.22);
  --rule-soft: rgba(232,220,192,0.1);
  --accent: #c9a878;
  --accent-2: #8ba0c4;
  --block-bg: rgba(240,230,200,0.05);
  --block-bg-2: rgba(180,200,240,0.06);
  --hover-bg: rgba(201,168,120,0.14);
  --num-bg: rgba(240,230,200,0.05);
}
.section.mood-deep-night::after {
  /* subtle star field */
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 14% 22%, rgba(255,250,220,0.7), transparent 60%),
    radial-gradient(1px 1px at 28% 48%, rgba(255,250,220,0.5), transparent 60%),
    radial-gradient(1px 1px at 44% 18%, rgba(255,250,220,0.6), transparent 60%),
    radial-gradient(1px 1px at 62% 62%, rgba(255,250,220,0.5), transparent 60%),
    radial-gradient(1px 1px at 76% 32%, rgba(255,250,220,0.6), transparent 60%),
    radial-gradient(1px 1px at 88% 78%, rgba(255,250,220,0.5), transparent 60%),
    radial-gradient(1px 1px at 8% 78%, rgba(255,250,220,0.5), transparent 60%),
    radial-gradient(1px 1px at 36% 88%, rgba(255,250,220,0.4), transparent 60%),
    radial-gradient(1px 1px at 92% 12%, rgba(255,250,220,0.6), transparent 60%);
}

/* ============== MOOD: stormy-grey (Section VIII) ============== */
.section.mood-stormy-grey {
  background:
    radial-gradient(ellipse at 60% 20%, rgba(180,180,190,0.12), transparent 55%),
    radial-gradient(ellipse at 10% 80%, rgba(80,80,100,0.18), transparent 55%),
    linear-gradient(180deg, #4d525e 0%, #3a3e48 60%, #2a2d36 100%);
  --ink-strong: #e4e2da;
  --ink-body: #c4c2bc;
  --ink-emph: #f0c878;
  --ink-muted: rgba(228,226,218,0.55);
  --rule: rgba(228,226,218,0.22);
  --rule-soft: rgba(228,226,218,0.1);
  --accent: #d9a878;
  --accent-2: #a8b0c4;
  --block-bg: rgba(240,238,220,0.05);
  --block-bg-2: rgba(200,200,220,0.06);
  --hover-bg: rgba(217,168,120,0.14);
  --num-bg: rgba(240,238,220,0.05);
}

/* ============== MOOD: dawn-bronze (Section IX) ============== */
.section.mood-dawn-bronze {
  background:
    radial-gradient(ellipse at 70% 10%, rgba(255,210,140,0.4), transparent 55%),
    radial-gradient(ellipse at 10% 80%, rgba(200,140,80,0.2), transparent 55%),
    linear-gradient(180deg, #f4dfb5 0%, #ecc78f 60%, #d4a872 100%);
  --ink-strong: #3a2410;
  --ink-body: #4a341d;
  --ink-emph: #7a2a1a;
  --ink-muted: rgba(58,36,16,0.55);
  --rule: rgba(58,36,16,0.25);
  --rule-soft: rgba(58,36,16,0.13);
  --accent: #a83828;
  --accent-2: #7a5a2a;
  --block-bg: rgba(255,250,235,0.55);
  --block-bg-2: rgba(248,230,200,0.5);
  --hover-bg: rgba(168,56,40,0.10);
  --num-bg: rgba(255,250,235,0.45);
}

/* ============== MOOD: twilight (Section X) ============== */
.section.mood-twilight {
  background:
    radial-gradient(ellipse at 80% 30%, rgba(220,180,180,0.3), transparent 55%),
    radial-gradient(ellipse at 20% 80%, rgba(120,110,150,0.3), transparent 55%),
    linear-gradient(180deg, #b8a0a8 0%, #8e7a92 50%, #4e4258 100%);
  --ink-strong: #f0e6d4;
  --ink-body: #d4c6b0;
  --ink-emph: #f4d098;
  --ink-muted: rgba(240,230,212,0.55);
  --rule: rgba(240,230,212,0.22);
  --rule-soft: rgba(240,230,212,0.1);
  --accent: #d99878;
  --accent-2: #c4a8c0;
  --block-bg: rgba(255,245,225,0.07);
  --block-bg-2: rgba(220,210,230,0.08);
  --hover-bg: rgba(217,152,120,0.16);
  --num-bg: rgba(255,245,225,0.06);
}

/* ============== Highlight banner for famous lines ============== */
.item.is-highlight .row-vert {
  font-family: var(--font-brush);
  font-size: calc(48px * var(--char-scale));
  color: var(--ink-emph);
}
.item.is-highlight .word-grid::after {
  content: "千古名句";
  position: absolute;
  top: -28px;
  right: 0;
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 4px 10px 4px 14px;
}

/* ============== Section divider (between sections) ============== */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0,0,0,0.4), transparent);
}

/* ============== Index / Nav ============== */
.toc {
  position: fixed;
  top: 50%;
  left: 18px;
  transform: translateY(-50%);
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: rgba(20,15,10,0.65);
  backdrop-filter: blur(8px);
  padding: 16px 12px;
  border-radius: 3px;
  border: 1px solid rgba(200,170,120,0.2);
}
.toc a {
  width: 22px; height: 22px;
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-size: 12px;
  color: rgba(220,200,170,0.55);
  text-decoration: none;
  border-radius: 2px;
  transition: all .2s ease;
}
.toc a:hover, .toc a.is-active {
  color: #f3e3c3;
  background: rgba(168,50,50,0.45);
}

/* ============== Footer ============== */
.colophon {
  background: #14100a;
  color: #8a7350;
  padding: 64px 40px 80px;
  text-align: center;
  font-size: 13px;
  letter-spacing: 0.3em;
  line-height: 2;
}
.colophon .seal {
  display: inline-block;
  margin: 16px 0;
  width: 56px; height: 56px;
  border: 2px solid var(--seal-red);
  color: var(--seal-red);
  font-family: var(--font-display);
  writing-mode: vertical-rl;
  font-size: 15px;
  line-height: 26px;
  padding: 4px 0;
  border-radius: 3px;
}

/* ============== Responsive ============== */
@media (max-width: 960px) {
  .section { padding: 80px 0 60px; }
  .section-head { padding: 0 28px; gap: 18px; grid-template-columns: auto 1fr; }
  .section-num { display: none; }
  .section-label { font-size: 64px; }
  .items { padding: 0 28px; gap: 56px; }
  .item { grid-template-columns: 40px 1fr; column-gap: 14px; }
  .word-grid { grid-template-columns: 60px 1fr; column-gap: 18px; }
  .word-grid::before { left: 60px; margin-left: 9px; }
  .row-vert { font-size: calc(28px * var(--char-scale)); padding: 6px 4px; }
  .item.is-highlight .row-vert { font-size: calc(32px * var(--char-scale)); }
  .item-extras { margin-left: 78px; }
  .item-title .preface-display { flex-direction: column; gap: 24px; }
  .item-title .preface-vert { border-right: none; border-bottom: 1px solid var(--rule); padding: 8px 0; font-size: 44px; }
  .item-title .preface-defs { grid-template-columns: 1fr; }
  .cover-title { font-size: 80px; }
}

/* --- Phones: tighter rhythm, bigger reading text, comfortable tap targets --- */
@media (max-width: 600px) {
  .section { padding: 64px 0 48px; }
  .section-head { padding: 0 18px; gap: 14px; margin-bottom: 40px; }
  .section-label { font-size: 50px; }
  .section-title { letter-spacing: 0.04em; }
  .section-subtitle { letter-spacing: 0.2em; font-size: 13px; }

  .items { padding: 0 16px; gap: 40px; }
  .item { grid-template-columns: 30px 1fr; column-gap: 10px; }
  .item-meta { padding-top: 6px; gap: 10px; }
  .item-meta::after { min-height: 40px; }
  .item-num { font-size: 11px; padding: 3px 5px 4px; }

  .word-grid { grid-template-columns: 50px 1fr; column-gap: 13px; }
  .word-grid::before { left: 50px; margin-left: 6px; }
  .row-vert { font-size: calc(25px * var(--char-scale)); padding: 7px 3px 5px; }
  .item.is-highlight .row-vert { font-size: calc(29px * var(--char-scale)); }

  /* a little more breathing room + larger gloss text for thumb reading */
  .row-def { padding: 9px 8px 9px 13px; }
  .row-def .d { font-size: 15px; line-height: 1.85; }
  .row-def .w-py { font-size: 16px; }
  .row-def .w-py ruby rb { font-size: 19px; }

  .summary { font-size: 13.5px; line-height: 1.8; }
  .summary .a-head { font-size: 15px; }
  .item.is-highlight .word-grid::after { top: -22px; font-size: 10px; letter-spacing: 0.3em; }

  /* keep the active ring from being clipped against the tight column */
  .row:not(.row-trivial).is-active .row-vert { box-shadow: inset 0 0 0 1px var(--accent); }

  .cover { padding: 64px 28px; }
  .cover-title { font-size: 72px; }
  .colophon { padding: 48px 24px 96px; letter-spacing: 0.2em; }
}

/* ============== Mobile section nav (bottom strip) ============== */
@media (max-width: 960px) {
  .toc {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    transform: none;
    flex-direction: row;
    justify-content: flex-start;
    gap: 4px;
    padding: 8px 12px calc(8px + env(safe-area-inset-bottom, 0px));
    border-radius: 0;
    border: none;
    border-top: 1px solid rgba(200,170,120,0.25);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .toc::-webkit-scrollbar { display: none; }
  .toc a {
    flex: 0 0 auto;
    width: 32px;
    height: 32px;
    font-size: 14px;
  }
  /* let the bottom nav clear the final content */
  .colophon { padding-bottom: 96px; }
}

/* ============== Font size control ============== */
.font-ctrl {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(20,15,10,0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  padding: 5px 6px;
  border-radius: 3px;
  border: 1px solid rgba(200,170,120,0.2);
}
.font-ctrl button {
  -webkit-appearance: none;
  appearance: none;
  background: none;
  border: none;
  color: rgba(220,200,170,0.65);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  cursor: pointer;
  border-radius: 2px;
  transition: color .15s, background .15s;
  padding: 0;
}
.font-ctrl button:hover:not(:disabled) {
  color: #f3e3c3;
  background: rgba(168,50,50,0.45);
}
.font-ctrl button:disabled {
  opacity: 0.25;
  cursor: default;
}