:root {
  --bg-paper: #f6f2e8;
  --bg-paper-dark: #ece6d8;
  --bg-card: rgba(252, 250, 245, 0.88);
  --ink-black: #121210;
  --ink-charcoal: #2c2b28;
  --ink-grey: #5a5751;
  --ink-faint: #8e8a80;
  --ink-border: rgba(18, 18, 16, 0.14);
  --ink-border-strong: rgba(18, 18, 16, 0.32);
  --vermilion: #a8241c;
  --vermilion-soft: rgba(168, 36, 28, 0.10);
  --vermilion-border: rgba(168, 36, 28, 0.35);
  --jade-accent: #2b4c3f;
  --jade-soft: rgba(43, 76, 63, 0.10);
  --gold-accent: #8c6a32;

  --font-serif: "Cormorant Garamond", "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --font-calligraphy: "Ma Shan Zheng", "Zhi Mang Xing", "Liu Jian Mao Cao", "Kaiti SC", STKaiti, serif;
}

[data-theme="dark"] {
  --bg-paper: #0f0f0e;
  --bg-paper-dark: #171715;
  --bg-card: rgba(26, 26, 23, 0.88);
  --ink-black: #f0ece1;
  --ink-charcoal: #d6d1c4;
  --ink-grey: #9c978b;
  --ink-faint: #666259;
  --ink-border: rgba(240, 236, 225, 0.14);
  --ink-border-strong: rgba(240, 236, 225, 0.28);
  --vermilion: #d13b31;
  --vermilion-soft: rgba(209, 59, 49, 0.14);
  --vermilion-border: rgba(209, 59, 49, 0.42);
  --jade-accent: #4c856f;
  --jade-soft: rgba(76, 133, 111, 0.15);
  --gold-accent: #c49a52;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-paper);
  color: var(--ink-black);
  font-family: var(--font-sans);
  line-height: 1.58;
  overflow-x: hidden;
  transition: background-color 0.4s ease, color 0.4s ease;
  position: relative;
}

/* Subtle Xuan paper grain & ink wash backdrop */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    radial-gradient(circle at 15% 12%, rgba(18, 18, 16, 0.05) 0%, transparent 48%),
    radial-gradient(circle at 88% 28%, rgba(168, 36, 28, 0.035) 0%, transparent 40%),
    radial-gradient(circle at 50% 85%, rgba(18, 18, 16, 0.045) 0%, transparent 55%);
}

#ink-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
}

/* Layout & Container */
.container {
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 2;
}

/* Top Navigation Bar — Single-Line Compact Header */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg-paper) 86%, transparent);
  border-bottom: 1px solid var(--ink-border);
  height: 60px;
  display: flex;
  align-items: center;
}

.navbar-inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: nowrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink-black);
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: var(--vermilion);
  color: #f9f6f0;
  font-family: var(--font-calligraphy);
  font-size: 1.22rem;
  border-radius: 3px;
  box-shadow: inset 0 0 0 1.5px rgba(255, 255, 255, 0.28);
  letter-spacing: -1px;
  flex-shrink: 0;
}

.brand-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.28rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.brand-subtitle {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-grey);
  padding-left: 0.55rem;
  border-left: 1px solid var(--ink-border-strong);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.35rem;
  list-style: none;
  flex-wrap: nowrap;
}

.nav-links li {
  white-space: nowrap;
}

.nav-links a {
  position: relative;
  text-decoration: none;
  color: var(--ink-charcoal);
  font-family: var(--font-serif);
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.035em;
  padding: 0.2rem 0;
  white-space: nowrap;
  transition: color 0.25s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1.5px;
  background: var(--vermilion);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-links a:hover {
  color: var(--vermilion);
}

.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--ink-border-strong);
  color: var(--ink-charcoal);
  padding: 0.34rem 0.78rem;
  border-radius: 4px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 0.86rem;
  letter-spacing: 0.025em;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  border-color: var(--vermilion);
  color: var(--vermilion);
  background: var(--vermilion-soft);
}

/* Hero Section — Equal-Height Two-Column Stage */
.hero {
  position: relative;
  padding: 2.75rem 0 3rem;
  border-bottom: 1px solid var(--ink-border);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 0.96fr 1.04fr;
  gap: 2.5rem;
  align-items: stretch;
}

/* Left Column: Calligraphic Masterpiece */
.hero-calligraphy-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem 1.4rem 1.5rem;
  border: 1px solid var(--ink-border);
  background: linear-gradient(145deg, var(--bg-card) 0%, color-mix(in srgb, var(--bg-paper-dark) 60%, transparent) 100%);
  border-radius: 6px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.04);
}

.hero-calligraphy-stage::before,
.hero-calligraphy-stage::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border-color: var(--ink-border-strong);
  border-style: solid;
}

.hero-calligraphy-stage::before {
  top: 10px;
  left: 10px;
  border-width: 1.5px 0 0 1.5px;
}

.hero-calligraphy-stage::after {
  bottom: 10px;
  right: 10px;
  border-width: 0 1.5px 1.5px 0;
}

.vertical-inscription {
  position: absolute;
  top: 1.35rem;
  left: 1.15rem;
  writing-mode: vertical-rl;
  font-family: var(--font-serif);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  user-select: none;
}

.ink-character-wrap {
  position: relative;
  width: 236px;
  height: 236px;
  margin: auto 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ink-ensou-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.85;
  filter: url(#ink-bleed);
}

.hanzi-jue {
  position: relative;
  z-index: 2;
  font-family: var(--font-calligraphy);
  font-size: 11.4rem;
  line-height: 1;
  color: var(--ink-black);
  filter: url(#ink-brush);
  user-select: none;
  transform: translateY(-4px);
  text-shadow: 2px 4px 12px rgba(0, 0, 0, 0.08);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.ink-character-wrap:hover .hanzi-jue {
  transform: translateY(-6px) scale(1.03);
}

/* Traditional Vermilion Seal (印章) */
.vermilion-chop {
  position: absolute;
  bottom: 14px;
  right: 16px;
  z-index: 3;
  width: 48px;
  height: 48px;
  background-color: var(--vermilion);
  color: #f6f2e8;
  border: 2px solid var(--vermilion);
  border-radius: 3px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  padding: 2px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.84rem;
  line-height: 1;
  text-align: center;
  align-items: center;
  box-shadow: 0 3px 10px rgba(168, 36, 28, 0.25), inset 0 0 0 1px rgba(246, 242, 232, 0.35);
  transform: rotate(-3deg);
}

.vermilion-chop span {
  display: block;
}

/* Phonetic & Etymology Plaque (Pinyin + IPA) */
.phonetic-plaque {
  margin-top: 0.85rem;
  width: 100%;
  border-top: 1px solid var(--ink-border);
  padding-top: 0.95rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
}

.phonetic-badges {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  gap: 0.45rem;
  align-items: center;
  width: 100%;
}

.phonetic-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.58rem;
  background: var(--bg-paper);
  border: 1px solid var(--ink-border-strong);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  white-space: nowrap;
}

.phonetic-pill .label {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-grey);
}

.phonetic-pill .value {
  font-weight: 600;
  color: var(--ink-black);
  font-size: 0.82rem;
}

.phonetic-pill.ipa .value {
  color: var(--vermilion);
}

.audio-btn {
  background: var(--vermilion-soft);
  border: 1px solid var(--vermilion-border);
  color: var(--vermilion);
  padding: 0.3rem 0.62rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.audio-btn:hover {
  background: var(--vermilion);
  color: #fff;
}

.etymology-caption {
  font-family: var(--font-serif);
  font-size: 0.92rem;
  line-height: 1.45;
  color: var(--ink-charcoal);
  text-align: center;
  max-width: 460px;
  font-style: italic;
}

/* Right Column: Hero Copy & Brothers Introduction */
.hero-content {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: var(--vermilion);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 1.5px;
  background: var(--vermilion);
}

.hero-headline {
  font-family: var(--font-serif);
  font-size: clamp(2.15rem, 3.4vw, 2.95rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink-black);
}

.hero-headline em {
  font-style: italic;
  font-weight: 600;
  color: var(--vermilion);
}

.hero-lead {
  font-size: 0.94rem;
  color: var(--ink-charcoal);
  line-height: 1.58;
}

/* Quick Dual-Brother Mini Cards in Hero — Strict Equal-Height & Aligned Rows */
.hero-brothers-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
  align-items: stretch;
}

.mini-brother {
  padding: 0.9rem 1rem;
  border: 1px solid var(--ink-border-strong);
  background: var(--bg-card);
  border-radius: 5px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.mini-brother:hover {
  transform: translateY(-2px);
  border-color: var(--vermilion);
}

.mini-brother-tag {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--vermilion);
  margin-bottom: 0.3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}

.mini-brother.flash .mini-brother-tag {
  color: var(--jade-accent);
}

.mini-brother h3 {
  font-family: var(--font-serif);
  font-size: 1.28rem;
  line-height: 1.2;
  margin-bottom: 0.3rem;
}

.mini-brother p {
  font-size: 0.79rem;
  color: var(--ink-grey);
  line-height: 1.45;
  flex: 1;
}

.hero-cta-row {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.65rem;
  margin-top: 0.15rem;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.62rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 4px;
  white-space: nowrap;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--ink-black);
  color: var(--bg-paper);
  border: 1px solid var(--ink-black);
}

.btn-primary:hover {
  background: var(--vermilion);
  border-color: var(--vermilion);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--ink-black);
  border: 1px solid var(--ink-border-strong);
}

.btn-secondary:hover {
  border-color: var(--ink-black);
  background: var(--bg-paper-dark);
}

/* Section Headers & Global Vertical Rhythm */
.section {
  padding: 3.4rem 0;
  border-bottom: 1px solid var(--ink-border);
}

.section-header {
  max-width: 840px;
  margin-bottom: 1.85rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 2.7vw, 2.3rem);
  font-weight: 700;
  line-height: 1.16;
  margin-top: 0.3rem;
  margin-bottom: 0.6rem;
}

.section-desc {
  color: var(--ink-charcoal);
  font-size: 0.93rem;
  line-height: 1.58;
}

/* Section 1: The Two Models (Jue & Jue-Flash) — Row-Synchronized Cards */
.brothers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  align-items: stretch;
}

.brother-card {
  background: var(--bg-card);
  border: 1px solid var(--ink-border-strong);
  border-radius: 6px;
  padding: 1.75rem 1.85rem;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.brother-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.brother-card::before {
  content: attr(data-watermark);
  position: absolute;
  top: -12px;
  right: 14px;
  font-family: var(--font-calligraphy);
  font-size: 6.8rem;
  color: var(--ink-black);
  opacity: 0.045;
  pointer-events: none;
  user-select: none;
}

.brother-card.elder {
  border-top: 4px solid var(--vermilion);
}

.brother-card.younger {
  border-top: 4px solid var(--jade-accent);
}

.brother-header {
  margin-bottom: 1rem;
}

.brother-role {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.22rem 0.6rem;
  border-radius: 3px;
  margin-bottom: 0.55rem;
  white-space: nowrap;
}

.elder .brother-role {
  background: var(--vermilion-soft);
  color: var(--vermilion);
  border: 1px solid var(--vermilion-border);
}

.younger .brother-role {
  background: var(--jade-soft);
  color: var(--jade-accent);
  border: 1px solid rgba(43, 76, 63, 0.35);
}

.brother-name {
  font-family: var(--font-serif);
  font-size: 1.95rem;
  font-weight: 700;
  line-height: 1.15;
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
}

.brother-name span.cn {
  font-family: var(--font-calligraphy);
  font-size: 1.55rem;
  font-weight: 400;
  color: var(--ink-grey);
}

.brother-tagline {
  margin-top: 0.35rem;
  font-size: 0.88rem;
  line-height: 1.48;
  color: var(--ink-charcoal);
  min-height: 2.65rem;
}

.spec-list {
  list-style: none;
  margin: 0.5rem 0 0.85rem;
  border-top: 1px dashed var(--ink-border-strong);
}

.spec-list li {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 0.85rem;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--ink-border);
  font-size: 0.83rem;
  line-height: 1.42;
  align-items: baseline;
}

.spec-key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-grey);
  text-transform: uppercase;
  white-space: nowrap;
}

.spec-val {
  color: var(--ink-black);
  font-weight: 500;
}

.brother-Metrics-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.65rem;
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid var(--ink-border);
}

.metric-box {
  background: var(--bg-paper);
  padding: 0.6rem 0.45rem;
  border-radius: 4px;
  border: 1px solid var(--ink-border);
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.metric-box .num {
  font-family: var(--font-serif);
  font-size: 1.38rem;
  font-weight: 700;
  color: var(--ink-black);
  display: block;
  line-height: 1.1;
}

.elder .metric-box .num {
  color: var(--vermilion);
}

.younger .metric-box .num {
  color: var(--jade-accent);
}

.metric-box .lbl {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--ink-grey);
  margin-top: 0.22rem;
  display: block;
  white-space: nowrap;
}

/* Section 2: Primitives Strip (Choice / Score / Noul) — Sub-Row Aligned */
.primitives-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.35rem;
  align-items: stretch;
}

.primitive-card {
  background: var(--bg-card);
  border: 1px solid var(--ink-border);
  border-radius: 5px;
  padding: 1.25rem 1.3rem;
  min-width: 0;
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 4.8rem 106px 1fr;
  gap: 0.55rem;
  align-items: start;
}

.primitive-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.primitive-name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--ink-black);
  white-space: nowrap;
}

.primitive-cn {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  color: var(--vermilion);
  padding: 0.12rem 0.45rem;
  background: var(--vermilion-soft);
  border-radius: 3px;
  white-space: nowrap;
}

.primitive-desc {
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--ink-charcoal);
}

.primitive-math {
  font-size: 0.78rem;
  background: var(--bg-paper);
  padding: 0.45rem 0.55rem;
  border-radius: 4px;
  border: 1px solid var(--ink-border);
  color: var(--ink-black);
  width: 100%;
  height: 106px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: auto;
  overflow-y: hidden;
  text-align: center;
}

.primitive-math .katex-display {
  margin: 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.primitive-foot {
  font-size: 0.76rem;
  line-height: 1.44;
  color: var(--ink-grey);
  align-self: start;
}

/* Section 3: Leaderboard Section — Single-Line Controls & Compact Table Rows */
.leaderboard-controls {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.85rem;
  margin-bottom: 0.9rem;
}

.tab-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.sandbox-tabs {
  margin-bottom: 1rem;
}

.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--ink-border-strong);
  color: var(--ink-charcoal);
  padding: 0.46rem 0.88rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  border-color: var(--vermilion);
  color: var(--vermilion);
}

.tab-btn.active {
  background: var(--ink-black);
  color: var(--bg-paper);
  border-color: var(--ink-black);
}

.leaderboard-search {
  padding: 0.45rem 0.8rem;
  background: var(--bg-card);
  border: 1px solid var(--ink-border-strong);
  border-radius: 4px;
  color: var(--ink-black);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  width: 250px;
  flex-shrink: 0;
}

.suite-desc {
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--ink-charcoal);
  margin-bottom: 0.95rem;
}

.table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--ink-border-strong);
  border-radius: 6px;
  overflow-x: auto;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
}

.benchmark-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  text-align: left;
}

.benchmark-table th,
.benchmark-table td {
  padding: 0.48rem 0.52rem;
  border-bottom: 1px solid var(--ink-border);
  vertical-align: middle;
}

.benchmark-table th {
  background: var(--bg-paper-dark);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--ink-charcoal);
  white-space: nowrap;
  user-select: none;
  padding: 0.58rem 0.52rem;
}

.benchmark-table td:first-child {
  width: 27%;
  min-width: 195px;
}

.bench-name {
  font-weight: 600;
  color: var(--ink-black);
  line-height: 1.26;
  font-size: 0.8rem;
}

.bench-note {
  font-size: 0.68rem;
  color: var(--ink-grey);
  line-height: 1.28;
  margin-top: 2px;
}

.benchmark-table tbody tr:hover {
  background: color-mix(in srgb, var(--vermilion-soft) 35%, transparent);
}

.col-model-jue {
  background: rgba(168, 36, 28, 0.04);
  font-weight: 600;
  white-space: nowrap;
}

.col-model-flash {
  background: rgba(43, 76, 63, 0.05);
  font-weight: 600;
  white-space: nowrap;
}

.badge-domain {
  display: inline-block;
  padding: 0.12rem 0.38rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  border-radius: 3px;
  background: var(--bg-paper-dark);
  color: var(--ink-charcoal);
  border: 1px solid var(--ink-border);
  white-space: nowrap;
}

.score-bar-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
}

.score-bar {
  width: 34px;
  height: 6px;
  background: var(--ink-border);
  border-radius: 3px;
  overflow: hidden;
  flex-shrink: 0;
}

.score-bar-fill {
  height: 100%;
  border-radius: 3px;
}

.score-bar-fill.jue {
  background: var(--vermilion);
}

.score-bar-fill.flash {
  background: var(--jade-accent);
}

.score-bar-fill.base {
  background: var(--ink-faint);
}

.win-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  padding: 0.06rem 0.32rem;
  border-radius: 3px;
  margin-left: 0.15rem;
  white-space: nowrap;
}

.win-pill.gold {
  background: var(--vermilion-soft);
  color: var(--vermilion);
  border: 1px solid var(--vermilion-border);
}

.win-pill.jade {
  background: var(--jade-soft);
  color: var(--jade-accent);
  border: 1px solid rgba(43, 76, 63, 0.35);
}

/* Section 4: Architectural Innovations (3×2 Balanced Grid) */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.15rem;
  align-items: stretch;
}

/* Section 5: Interactive SystemOne Sandbox — Matched Height Without Clipping */
.sandbox-grid {
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  gap: 1.35rem;
  align-items: stretch;
}

.code-panel {
  background: var(--bg-card);
  border: 1px solid var(--ink-border-strong);
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.code-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.62rem 1rem;
  background: var(--bg-paper-dark);
  border-bottom: 1px solid var(--ink-border);
  font-family: var(--font-mono);
  font-size: 0.73rem;
  flex-shrink: 0;
}

.code-panel-body {
  padding: 0.9rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  line-height: 1.38;
  overflow-x: auto;
  flex: 1;
}

pre.code-panel-body {
  white-space: pre-wrap;
  margin: 0;
}

div.code-panel-body {
  white-space: normal;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.55rem;
}

.sandbox-models-bar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px dashed var(--ink-border-strong);
}

.sandbox-model-meta {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.sandbox-q-card {
  background: var(--bg-paper);
  border: 1px solid var(--ink-border);
  border-radius: 4px;
  padding: 0.55rem 0.75rem;
}

.sandbox-q-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  margin-bottom: 0.45rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--ink-border);
}

.sandbox-q-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.dist-row {
  margin-bottom: 0.24rem;
}

.dist-row:last-child {
  margin-bottom: 0;
}

.dist-label-line {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.69rem;
  margin-bottom: 0.1rem;
}

.dist-track {
  height: 5px;
  background: var(--bg-paper-dark);
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--ink-border);
}

.dist-fill {
  height: 100%;
  background: var(--vermilion);
  transition: width 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.dist-fill.secondary {
  background: var(--jade-accent);
}

/* Section 6: 16 Security Domains Matrix (4×4 Equal-Height Grid) */
.domains-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.95rem;
  align-items: stretch;
}

.domain-card {
  background: var(--bg-card);
  border: 1px solid var(--ink-border);
  border-radius: 5px;
  padding: 0.95rem 1.05rem;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.domain-card:hover {
  border-color: var(--ink-border-strong);
  transform: translateY(-2px);
}

.domain-num {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--vermilion);
  letter-spacing: 0.06em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.domain-card h4 {
  font-family: var(--font-serif);
  font-size: 1.08rem;
  line-height: 1.22;
  margin: 0.18rem 0 0.32rem;
}

.domain-card p {
  font-size: 0.79rem;
  color: var(--ink-grey);
  line-height: 1.44;
  flex: 1;
}

/* Footer */
.footer {
  padding: 2.5rem 0;
  font-size: 0.84rem;
  color: var(--ink-grey);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
}

@media (max-width: 1080px) {
  .domains-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .arch-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .leaderboard-controls {
    flex-wrap: wrap;
  }
}

@media (max-width: 960px) {
  .hero-grid,
  .brothers-grid,
  .primitives-grid,
  .sandbox-grid,
  .arch-grid,
  .domains-grid {
    grid-template-columns: 1fr;
  }
  .primitive-card {
    grid-template-rows: auto auto auto auto;
  }
  .nav-links {
    display: none;
  }
  .hero-cta-row,
  .phonetic-badges {
    flex-wrap: wrap;
  }
}