/* AI Thesis Research — Academic Trust Design System */

/* === Design tokens === */
:root {
  /* Color: Academic Navy + Crimson accent (트러스트 + 학술적 진중함) */
  --color-bg: oklch(0.985 0.004 250);           /* Warm off-white */
  --color-surface: #ffffff;
  --color-surface-2: oklch(0.975 0.004 250);
  --color-border: oklch(0.91 0.008 255);
  --color-border-strong: oklch(0.84 0.01 255);

  --color-text: oklch(0.23 0.022 265);
  --color-text-muted: oklch(0.45 0.018 265);
  --color-text-soft: oklch(0.56 0.015 265);

  --color-primary: oklch(0.23 0.022 265);       /* Deep navy */
  --color-primary-dark: oklch(0.17 0.02 265);
  --color-primary-light: oklch(0.40 0.02 265);

  --color-accent: #8b1538;        /* Crimson (KU 색) */
  --color-accent-light: #b91c52;

  --color-success: #2d6a4f;
  --color-warning: #b8860b;
  --color-info: #3a6080;

  /* School brand accents */
  --school-korea: #8b1538;
  --school-snu: #003a70;
  --school-yonsei: #00205b;
  --school-hanyang: #0e4d92;
  --school-skku: #00563f;
  --school-sogang: #6a1b9a;
  --school-cau: #002855;
  --school-khu: #8b0000;
  --school-uos: #1d3557;

  /* Typography */
  --font-sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --font-serif: "Source Serif Pro", "Noto Serif KR", Georgia, serif;
  --font-mono: "JetBrains Mono", "SF Mono", Monaco, Consolas, monospace;

  /* Spacing (8px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Radius */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Shadow */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 2px 8px rgba(20,20,20,0.06);
  --shadow-md: 0 4px 16px rgba(20,20,20,0.08);
  --shadow-lg: 0 12px 32px rgba(20,20,20,0.12);

  /* Transitions */
  --tx-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --tx: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-weight: 600;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "ss02";
}

img { max-width: 100%; display: block; }

/* === Container === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* === Header === */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.92);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  gap: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-primary);
}

.brand-mark {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: -0.02em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-title {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  line-height: 1;
}

.brand-sub {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--space-1);
  align-items: center;
}

.nav-list a {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--tx-fast);
}

.nav-list a:hover {
  color: var(--color-primary);
  background: var(--color-surface-2);
}

.nav-list a.active {
  color: var(--color-primary);
  background: var(--color-surface-2);
  font-weight: 600;
}

/* === Hero (landing — asymmetric) === */
.hero {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0 clamp(2rem, 4vw, 3rem);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.hero-lead { min-width: 0; }

.hero-title {
  font-size: clamp(1.9rem, 4.2vw, 3rem);
  font-weight: 820;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: var(--space-5);
  color: var(--color-text);
  text-wrap: balance;
  word-break: keep-all;
}

.hero-title .accent { color: var(--color-accent); }

.hero-subtitle {
  font-size: 1.06rem;
  color: var(--color-text-muted);
  max-width: 60ch;
  margin: 0 0 var(--space-6);
  line-height: 1.65;
  word-break: keep-all;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-5);
  font-size: 0.82rem;
  color: var(--color-text-soft);
}

.hero-meta-item { white-space: nowrap; }
.hero-meta-item--wrap { white-space: normal; min-width: 0; overflow-wrap: anywhere; }
.hero-meta strong {
  color: var(--color-text);
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.86rem;
}

/* Hero figures — one lead figure + two supporting (asymmetric, not a card grid) */
.hero-figures {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 0;
}

.hero-figure {
  background: var(--color-surface);
  padding: var(--space-5);
}

.hero-figure--lead {
  grid-column: 1 / -1;
  padding: var(--space-6) var(--space-5);
  background: var(--color-surface-2);
}

.hero-figure dt {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-text-soft);
  margin-bottom: var(--space-2);
}

.hero-figure dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.hero-figure-num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--color-primary);
  font-size: clamp(1.6rem, 2.4vw, 2rem);
}

.hero-figure--lead .hero-figure-num {
  font-size: clamp(2.4rem, 4vw, 3.25rem);
  color: var(--color-accent);
}

.hero-figure-unit {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.hero-figure--lead p {
  margin: var(--space-2) 0 0;
  font-size: 0.84rem;
  color: var(--color-text-muted);
}

/* Hero (sub-pages — left-aligned, single column) */
.hero--sub {
  padding: clamp(2.25rem, 5vw, 3.5rem) 0 clamp(1.5rem, 3vw, 2.25rem);
}

.hero-sub-inner { max-width: 820px; }

.hero--sub .hero-title {
  font-size: clamp(1.7rem, 3.6vw, 2.5rem);
  margin-bottom: var(--space-4);
}

.school-kind {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-accent);
  background: rgba(139, 21, 56, 0.08);
  border: 1px solid rgba(139, 21, 56, 0.18);
  padding: 3px var(--space-3);
  border-radius: 999px;
  margin-bottom: var(--space-4);
}

/* === Section === */
.section {
  padding: var(--space-12) 0;
}

.section-head {
  margin-bottom: var(--space-8);
  max-width: 720px;
}

.section-title {
  font-size: clamp(1.4rem, 2.6vw, 1.85rem);
  font-weight: 760;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-3);
  color: var(--color-text);
  text-wrap: balance;
  word-break: keep-all;
}

.section-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 65ch;
  line-height: 1.65;
  word-break: keep-all;
}
.section-desc a { color: var(--color-accent); text-underline-offset: 3px; }

/* === Charts === */
.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.chart-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.chart-box-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-border);
}

.chart-box h3 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.chart-box-sub {
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.chart-canvas-wrap {
  position: relative;
  height: 320px;
}

/* === School cards === */
.school-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.school-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: all var(--tx);
  position: relative;
  overflow: hidden;
}

.school-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--brand-color, var(--color-primary));
  transition: width var(--tx);
}

.school-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.school-card:hover::before {
  width: 6px;
}

.school-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.school-name {
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.school-type {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.school-count {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--color-primary);
  white-space: nowrap;
}

.school-count em {
  font-size: 0.65rem;
  font-style: normal;
  color: var(--color-text-muted);
}

.school-depts {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.school-tags {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.school-tag {
  font-size: 0.72rem;
  padding: 3px var(--space-2);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.school-note {
  font-size: 0.82rem;
  color: var(--color-text-soft);
  line-height: 1.5;
  font-style: italic;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-3);
}

/* === Recommendation cards === */
.rec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-4);
}

.rec-subhead {
  font-size: 1.05rem;
  font-weight: 760;
  letter-spacing: -0.01em;
  margin: var(--space-8) 0 var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}
.rec-subhead:first-of-type { margin-top: var(--space-2); }
.rec-subhead--general { color: var(--color-primary); }
.rec-subhead--special { color: var(--color-accent); }

.rec-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: all var(--tx);
}

.rec-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
}

.rec-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.rec-school {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 3px var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: white;
  white-space: nowrap;
}

.rec-year {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-weight: 600;
}

.rec-title {
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.4;
  letter-spacing: -0.005em;
}

.rec-author {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.rec-reason {
  font-size: 0.85rem;
  color: var(--color-text);
  background: var(--color-surface-2);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-accent);
  line-height: 1.5;
}

/* === Block (summary / reason 통합 스타일) === */
.rec-block {
  font-size: 0.85rem;
  background: var(--color-surface-2);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  line-height: 1.55;
}
.rec-block-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
  margin-bottom: 4px;
  text-transform: uppercase;
}
.rec-block-text { color: var(--color-text); }
.rec-summary { border-left: 3px solid var(--color-primary-light); }
.rec-block.rec-reason { border-left: 3px solid var(--color-accent); }

/* === Action button (원본 단일) === */
.rec-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-2);
}
.rec-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--tx-fast);
  text-align: center;
  white-space: nowrap;
}
.rec-btn-icon { font-size: 0.95rem; line-height: 1; }
.rec-btn-meta {
  font-size: 0.65rem;
  font-weight: 500;
  opacity: 0.85;
  margin-left: 4px;
}
.rec-btn-original {
  background: var(--color-primary);
  color: white;
}
.rec-btn-original:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.rec-btn-cloud {
  background: var(--color-accent);
  color: white;
}
.rec-btn-cloud:hover {
  background: var(--color-accent-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.rec-btn-cloud-disabled {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--color-border);
  color: var(--color-text-muted);
  cursor: not-allowed;
  text-align: center;
  white-space: nowrap;
}
@media (max-width: 480px) {
  .rec-actions { grid-template-columns: 1fr; }
  .rec-btn-meta { display: none; }
}

/* === 객관 점수 배지 === */
.rec-head-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.rec-score-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  padding: 4px var(--space-2);
  border-radius: var(--radius-sm);
  background: var(--score-color, var(--color-primary));
  color: white;
  line-height: 1;
}
.rec-score-tier {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  opacity: 0.85;
  margin-bottom: 2px;
}
.rec-score-value {
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

/* === DeptType 배지 === */
.dept-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px var(--space-2);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  white-space: nowrap;
}
.dept-general {
  background: rgba(30, 42, 74, 0.08);
  color: var(--color-primary);
  border-color: rgba(30, 42, 74, 0.2);
}
.dept-special {
  background: rgba(139, 21, 56, 0.08);
  color: var(--color-accent);
  border-color: rgba(139, 21, 56, 0.2);
}
.dept-phd {
  background: rgba(184, 134, 11, 0.12);
  color: #6b4e00;
  border-color: rgba(184, 134, 11, 0.35);
}

/* === 객관 지표 pill === */
.rec-metrics-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: var(--space-2) 0;
}
.rec-metrics-empty {
  font-size: 0.78rem;
  color: var(--color-text-soft);
  font-style: italic;
  padding: var(--space-2) 0;
}
.metric-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--tx-fast);
}
.metric-pill:hover { background: var(--color-bg); }
.metric-pill b { font-weight: 800; padding: 0 3px; border-radius: 3px; }
.metric-venue { background: #fff7e6; border-color: #ffd591; color: #874d00; }
.metric-venue.tier-s b { background: #d4380d; color: white; }
.metric-venue.tier-a b { background: #fa8c16; color: white; }
.metric-venue.tier-b b { background: #fadb14; color: #614700; }
.metric-cite { background: #e6f4ff; border-color: #91caff; color: #002c8c; }
.metric-code { background: #f0f5ff; border-color: #adc6ff; color: #061178; }
.metric-award { background: #fff0f6; border-color: #ffadd2; color: #780650; font-weight: 600; }
.metric-arxiv { background: #f6ffed; border-color: #b7eb8f; color: #1f5408; font-family: var(--font-mono); font-size: 0.7rem; }

/* === 점수 분해 === */
.rec-breakdown {
  font-size: 0.72rem;
  color: var(--color-text-soft);
  background: var(--color-surface-2);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  text-align: center;
  margin-top: 4px;
}
.rec-breakdown span { padding: 0 3px; }

/* === 검증 노트 (접힘 가능) === */
.rec-notes {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px var(--space-2);
}
.rec-notes summary {
  cursor: pointer;
  font-weight: 500;
  user-select: none;
}
.rec-notes-body {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
  line-height: 1.5;
}

.rec-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-2);
}

.rec-cats {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.cat-badge {
  font-size: 0.7rem;
  padding: 2px var(--space-2);
  border-radius: var(--radius-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.cat-llm { background: #dbeafe; color: #1e40af; }
.cat-ai4sci { background: #d1fae5; color: #065f46; }
.cat-rl { background: #fef3c7; color: #92400e; }
.cat-mm { background: #fce7f3; color: #9d174d; }
.cat-cv { background: #e0e7ff; color: #3730a3; }
.cat-sec { background: #fee2e2; color: #991b1b; }
.cat-other { background: #f3f4f6; color: #4b5563; }

.rec-pdf {
  font-size: 0.85rem;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.rec-pdf:hover {
  text-decoration: underline;
}

.rec-pdf::before { content: "↓"; }

/* === Filters === */
.filter-bar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.filter-label {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin-right: var(--space-1);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--tx-fast);
  user-select: none;
}

.chip:hover {
  background: var(--color-surface-2);
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.chip.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.chip-count {
  font-size: 0.7rem;
  background: rgba(255,255,255,0.2);
  padding: 1px 6px;
  border-radius: 999px;
  font-weight: 600;
}

.chip:not(.active) .chip-count {
  background: var(--color-surface-2);
  color: var(--color-text-muted);
}

.search-input {
  flex: 1;
  min-width: 200px;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  font-size: 0.92rem;
  font-family: inherit;
  background: var(--color-surface);
  transition: border-color var(--tx-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* === Markdown content === */
.markdown-body {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  max-width: 920px;
  margin: 0 auto;
  font-size: 0.95rem;
  line-height: 1.75;
}

.markdown-body h1 {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-primary);
}

.markdown-body h2 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: var(--space-8) 0 var(--space-3);
  color: var(--color-primary);
  padding-left: var(--space-3);
  border-left: 4px solid var(--color-accent);
}

.markdown-body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: var(--space-5) 0 var(--space-2);
}

.markdown-body p { margin: var(--space-3) 0; }

.markdown-body ul, .markdown-body ol {
  margin: var(--space-3) 0 var(--space-3) var(--space-6);
}

.markdown-body li { margin: var(--space-1) 0; }

.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.markdown-body th {
  background: var(--color-primary);
  color: white;
  padding: var(--space-3);
  text-align: left;
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.markdown-body td {
  padding: var(--space-3);
  border-top: 1px solid var(--color-border);
  vertical-align: top;
}

.markdown-body tr:nth-child(even) td { background: var(--color-surface-2); }

.markdown-body code {
  background: var(--color-surface-2);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--color-accent);
}

.markdown-body pre {
  background: #1a1a1a;
  color: #f0f0f0;
  padding: var(--space-4);
  border-radius: var(--radius);
  overflow-x: auto;
  margin: var(--space-4) 0;
  font-size: 0.85rem;
}

.markdown-body pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.markdown-body blockquote {
  border-left: 4px solid var(--color-accent);
  padding: var(--space-3) var(--space-4);
  margin: var(--space-4) 0;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.markdown-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: rgba(139,21,56,0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--tx-fast);
}

.markdown-body a:hover {
  text-decoration-color: var(--color-accent);
}

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--tx-fast);
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: var(--color-surface-2);
  border-color: var(--color-border-strong);
}

/* === Action plan — ordered timeline === */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 760px;
}

.timeline-step {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: var(--space-5);
  position: relative;
  padding: 0 0 var(--space-6) var(--space-5);
  margin-left: 0.25rem;
  border-left: 2px solid var(--color-border);
}

.timeline-step:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.timeline-step::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 2px solid var(--color-accent);
}
.timeline-step:last-child::before { background: var(--color-accent); }

.timeline-when {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.01em;
  padding-top: 1px;
  white-space: nowrap;
}

.timeline-body strong {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-1);
  color: var(--color-text);
}
.timeline-body p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.6;
  word-break: keep-all;
}

@media (max-width: 560px) {
  .timeline-step {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }
}

/* === Footer === */
.site-footer {
  margin-top: var(--space-16);
  padding: var(--space-10) 0;
  background: var(--color-primary);
  color: rgba(255,255,255,0.85);
  font-size: 0.85rem;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.footer-meta { line-height: 1.8; }
.footer-meta strong { color: white; }
.footer-meta a { color: rgba(255,255,255,0.85); text-decoration: underline; }

.footer-credit {
  text-align: right;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
}

/* === Responsive === */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 768px) {
  .container { padding: 0 var(--space-4); }
  .header-inner { flex-direction: column; align-items: flex-start; gap: var(--space-3); }
  .nav-list { flex-wrap: wrap; }
  .hero { padding: var(--space-10) 0 var(--space-8); }
  .section { padding: var(--space-8) 0; }
  .markdown-body { padding: var(--space-5); }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-credit { text-align: left; }
  .chart-grid { grid-template-columns: 1fr; }
}

@media (max-width: 420px) {
  .hero-figures { grid-template-columns: 1fr; }
}

/* === Motion === */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* === Utilities === */
.text-muted { color: var(--color-text-muted); }
.text-accent { color: var(--color-accent); }
.center { text-align: center; }

/* === 코어 / 도메인 학과 라벨 === */
.dept-core-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(30, 42, 74, 0.1);
  color: var(--color-primary);
  margin-right: 4px;
}
.dept-domain-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(139, 21, 56, 0.1);
  color: var(--color-accent);
  margin-right: 4px;
}

/* === 파인만식 해석 === */
.rec-feynman {
  background: linear-gradient(135deg, #fff7e6 0%, #fefae0 100%);
  border: 1px solid #ffd591;
  border-left: 4px solid #fa8c16;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  line-height: 1.6;
}
.rec-feynman-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #874d00;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.rec-feynman-short {
  color: #1a1a1a;
  white-space: pre-line;
}
.rec-feynman-more {
  margin-top: 8px;
  border-top: 1px dashed #ffd591;
  padding-top: 8px;
}
.rec-feynman-more summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.78rem;
  color: #d4380d;
  user-select: none;
}
.rec-feynman-more summary:hover { color: #ad2102; }
.rec-feynman-long {
  margin-top: 8px;
  color: #1a1a1a;
  font-size: 0.85rem;
  line-height: 1.7;
  white-space: pre-line;
}
.rec-feynman-long h4 {
  font-size: 0.85rem;
  font-weight: 700;
  margin: 8px 0 4px;
  color: #874d00;
}
.rec-feynman-long ul, .rec-feynman-long ol {
  margin: 4px 0 4px 20px;
}

/* === 2026-11 갱신: 새로 등록된 논문 === */
.update-schools {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}
.update-schools a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.9rem;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--tx-fast), color var(--tx-fast);
}
.update-schools a:hover { border-color: var(--color-accent); color: var(--color-accent); }
.update-schools a:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.update-schools b { font-variant-numeric: tabular-nums; font-weight: 700; }
.update-note { margin-top: var(--space-4); color: var(--color-text-muted); font-size: 0.9rem; max-width: 70ch; }

.recent-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}
.recent-item {
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}
.recent-title {
  color: var(--color-text);
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  overflow-wrap: anywhere;
}
.recent-title:hover { color: var(--color-accent); text-decoration: underline; text-underline-offset: 3px; }
.recent-alt { display: block; color: var(--color-text-muted); font-size: 0.88rem; margin-top: 2px; overflow-wrap: anywhere; }
.recent-meta { display: block; color: var(--color-text-soft); font-size: 0.85rem; margin-top: 4px; font-variant-numeric: tabular-nums; }
.recent-more summary {
  cursor: pointer;
  padding: var(--space-3) 0;
  font-weight: 600;
  color: var(--color-accent);
  user-select: none;
}
.recent-more summary:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }