/* ============================================
   锐报研究所 SharpPost Institute
   Design System v0.1 — Prototype
   ============================================ */

:root {
  /* === Color: Light === */
  --inst-bg: #fafaf7;
  --inst-bg-card: #ffffff;
  --inst-bg-tertiary: #ebe8dd;
  --inst-bg-elevated: #ffffff;
  --inst-text: #0d1b2a;
  --inst-text-2: #3d4757;
  --inst-text-3: #7a8290;
  --inst-text-inverse: #f5f3ec;

  /* Institute primary: deep ink blue (Foreign Affairs / Brookings) */
  --inst-accent: #0d1b2a;
  --inst-accent-hover: #1a2b40;
  --inst-accent-light: rgba(13, 27, 42, 0.07);
  --inst-accent-glow: rgba(13, 27, 42, 0.16);

  /* Secondary: champagne gold for highlights, version numbers, accents */
  --inst-gold: #b8956a;
  --inst-gold-light: rgba(184, 149, 106, 0.14);

  /* Borders */
  --inst-border: #d4cfbf;
  --inst-border-light: #e6e1d0;
  --inst-border-strong: #a8a190;

  /* Reference to main 锐报 brand for crosslinks */
  --rb-blue: #1e3a5f;

  /* Typography */
  --font-display: 'Cormorant SC', 'Noto Serif SC', Georgia, serif;
  --font-serif: 'Noto Serif SC', 'Source Han Serif SC', Georgia, serif;
  --font-sans: 'Inter', -apple-system, 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;

  /* Spacing — generous, academic */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  /* Sharper corners — academic feel */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(13, 27, 42, 0.05);
  --shadow-md: 0 2px 12px rgba(13, 27, 42, 0.08);
  --shadow-lg: 0 8px 32px rgba(13, 27, 42, 0.12);

  /* Reading column */
  --read-width: 680px;
  --content-width: 1200px;
}

[data-theme="dark"] {
  --inst-bg: #080d14;
  --inst-bg-card: #111722;
  --inst-bg-tertiary: #161d2a;
  --inst-bg-elevated: #1a2030;
  --inst-text: #e8e4d6;
  --inst-text-2: #a8aebc;
  --inst-text-3: #6a7280;
  --inst-text-inverse: #080d14;

  --inst-accent: #c9a875;
  --inst-accent-hover: #dcbe8c;
  --inst-accent-light: rgba(201, 168, 117, 0.1);
  --inst-accent-glow: rgba(201, 168, 117, 0.18);

  --inst-gold: #c9a875;
  --inst-gold-light: rgba(201, 168, 117, 0.12);

  --inst-border: #232b3a;
  --inst-border-light: #1a2030;
  --inst-border-strong: #3a4458;

  --rb-blue: #5a9fe6;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--inst-text);
  background: var(--inst-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'kern', 'liga', 'tnum';
}

a { color: var(--inst-accent); text-decoration: none; }
a:hover { color: var(--inst-accent-hover); }

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* ============================================
   Top Bar — institute sub-brand
   ============================================ */
.inst-topbar {
  background: var(--inst-bg-card);
  border-bottom: 1px solid var(--inst-border-light);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(247, 246, 241, 0.92);
}

[data-theme="dark"] .inst-topbar {
  background: rgba(12, 14, 13, 0.92);
}

.inst-topbar-meta {
  border-bottom: 1px solid var(--inst-border-light);
  font-size: 11px;
  color: var(--inst-text-3);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.inst-topbar-meta-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 6px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.inst-topbar-meta a {
  color: var(--inst-text-3);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.inst-topbar-meta a:hover { color: var(--rb-blue); }
.inst-topbar-meta-sep { opacity: 0.4; }

.inst-nav {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.inst-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.inst-brand-mark {
  width: 42px;
  height: 42px;
  background: var(--inst-accent);
  color: var(--inst-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  letter-spacing: -0.02em;
}
[data-theme="dark"] .inst-brand-mark {
  color: #0c0e0d;
}
.inst-brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.inst-brand-cn {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 18px;
  color: var(--inst-text);
  letter-spacing: 0.01em;
}
.inst-brand-en {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--inst-text-3);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-top: 2px;
}

.inst-nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.inst-nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--inst-text-2);
  font-family: var(--font-sans);
  position: relative;
  padding: 4px 0;
  letter-spacing: 0.02em;
}
.inst-nav-link:hover { color: var(--inst-accent); }
.inst-nav-link.active { color: var(--inst-text); }
.inst-nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--inst-accent);
}

.inst-nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.inst-icon-btn {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--inst-text-2);
  border-radius: var(--radius-md);
  transition: all 0.15s;
}
.inst-icon-btn:hover {
  background: var(--inst-accent-light);
  color: var(--inst-accent);
}

.inst-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--inst-accent);
  color: var(--inst-text-inverse);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--radius-md);
  transition: all 0.15s;
}
[data-theme="dark"] .inst-cta-btn { color: #0c0e0d; }
.inst-cta-btn:hover {
  background: var(--inst-accent-hover);
  color: var(--inst-text-inverse);
  transform: translateY(-1px);
}
[data-theme="dark"] .inst-cta-btn:hover { color: #0c0e0d; }

/* ============================================
   Layout containers
   ============================================ */
.inst-container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}
.inst-container-narrow {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}
.inst-container-read {
  max-width: var(--read-width);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: var(--space-8) 0; }

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4 { font-family: var(--font-serif); color: var(--inst-text); font-weight: 900; }

.inst-eyebrow {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--inst-accent);
}
[data-theme="dark"] .inst-eyebrow { color: var(--inst-accent); }

.inst-section-label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--inst-text-3);
  margin-bottom: var(--space-5);
}
.inst-section-label::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--inst-accent);
}

.display-1 {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--inst-text);
}

.display-2 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.lede {
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.6;
  color: var(--inst-text-2);
  font-weight: 400;
}

/* ============================================
   Hero — institute manifesto
   ============================================ */
.inst-hero {
  padding: var(--space-9) 0 var(--space-8);
  border-bottom: 1px solid var(--inst-border-light);
  background: var(--inst-bg);
  position: relative;
  overflow: hidden;
}

.inst-hero-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-7);
  align-items: end;
}

.inst-hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: var(--space-5);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--inst-accent);
}
.inst-hero-eyebrow::before {
  content: '';
  width: 48px;
  height: 1px;
  background: var(--inst-accent);
}

.inst-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.025em;
  color: var(--inst-text);
  margin-bottom: var(--space-5);
}
.inst-hero-title em {
  font-style: italic;
  color: var(--inst-accent);
  font-weight: 500;
}

.inst-hero-lede {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--inst-text-2);
  max-width: 580px;
  margin-bottom: var(--space-6);
}

.inst-hero-stats {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 28px 32px;
  background: var(--inst-bg-card);
  border: 1px solid var(--inst-border-light);
  border-left: 3px solid var(--inst-accent);
}

.stat-item .stat-num {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 500;
  color: var(--inst-accent);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-item .stat-label {
  font-size: 11px;
  color: var(--inst-text-3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 6px;
}
.stat-divider {
  height: 1px;
  background: var(--inst-border-light);
}

/* ============================================
   Featured report block
   ============================================ */
.featured-report {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-7);
  padding: var(--space-7) 0;
  border-top: 1px solid var(--inst-border);
  border-bottom: 1px solid var(--inst-border);
  margin: var(--space-7) 0;
}

.featured-report-cover {
  background: var(--inst-bg-card);
  border: 1px solid var(--inst-border);
  aspect-ratio: 3/4;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  padding: 28px 24px;
  color: var(--inst-text-inverse);
  background: linear-gradient(160deg, #0d1b2a 0%, #050b14 100%);
}
[data-theme="dark"] .featured-report-cover {
  background: linear-gradient(160deg, #1a3329 0%, #08161e 100%);
}
.featured-report-cover::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--inst-gold);
}
.cover-vol {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 8px;
}
.cover-issue {
  font-family: var(--font-display);
  font-size: 64px;
  font-weight: 500;
  line-height: 0.9;
  color: var(--inst-gold);
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.cover-period {
  font-family: var(--font-serif);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: auto;
}
.cover-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 900;
  color: #fff;
  line-height: 1.25;
  margin-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding-top: 16px;
}
.cover-brand {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 12px;
}

.featured-report-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.report-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  font-size: 12px;
  color: var(--inst-text-3);
  letter-spacing: 0.04em;
}
.report-meta .meta-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  background: var(--inst-accent-light);
  color: var(--inst-accent);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 10px;
  border-radius: var(--radius-sm);
}
.report-meta .meta-dot { width: 3px; height: 3px; background: var(--inst-text-3); border-radius: 50%; }

.featured-report-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin-bottom: 16px;
  color: var(--inst-text);
}

.featured-report-abstract {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.7;
  color: var(--inst-text-2);
  margin-bottom: 24px;
  max-width: 620px;
}

.featured-report-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.inst-read-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--inst-accent);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.inst-read-link::after {
  content: '→';
  transition: transform 0.2s;
}
.inst-read-link:hover::after { transform: translateX(4px); }

.inst-btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--inst-border-strong);
  color: var(--inst-text-2);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: all 0.15s;
}
.inst-btn-ghost:hover {
  border-color: var(--inst-accent);
  color: var(--inst-accent);
  background: var(--inst-accent-light);
}

/* ============================================
   Report cards grid
   ============================================ */
.reports-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}

.report-card {
  background: var(--inst-bg-card);
  border: 1px solid var(--inst-border-light);
  padding: 28px 28px 32px;
  display: flex;
  flex-direction: column;
  transition: all 0.2s;
  position: relative;
  border-top: 3px solid var(--inst-accent);
}
.report-card:hover {
  border-color: var(--inst-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.report-card-num {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--inst-text-3);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.report-card-num strong {
  color: var(--inst-accent);
  font-weight: 500;
}
.report-card-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 900;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--inst-text);
  margin-bottom: 14px;
}
.report-card-excerpt {
  font-size: 14px;
  line-height: 1.65;
  color: var(--inst-text-2);
  margin-bottom: 20px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.report-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--inst-border-light);
  font-size: 11px;
  color: var(--inst-text-3);
  letter-spacing: 0.04em;
}

/* ============================================
   Datasets
   ============================================ */
.datasets-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
}

.dataset-card {
  background: var(--inst-bg-card);
  border: 1px solid var(--inst-border-light);
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  transition: all 0.15s;
  position: relative;
}
.dataset-card:hover {
  border-color: var(--inst-accent);
  background: var(--inst-bg-elevated);
}
.dataset-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.dataset-format {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: var(--inst-bg-tertiary);
  color: var(--inst-text-3);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}
.dataset-card-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1.35;
  color: var(--inst-text);
  margin-bottom: 8px;
}
.dataset-card-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--inst-text-2);
  margin-bottom: 18px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.dataset-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 11px;
  color: var(--inst-text-3);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.dataset-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* ============================================
   Subscribe / Membership CTA
   ============================================ */
.member-cta {
  background: var(--inst-bg-card);
  border: 1px solid var(--inst-border);
  border-top: 3px solid var(--inst-accent);
  padding: var(--space-7) var(--space-7);
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-7);
  align-items: center;
}
.member-cta-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}
.member-cta-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--inst-text-2);
  margin-bottom: 24px;
}
.member-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.member-features li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14px;
  color: var(--inst-text-2);
  line-height: 1.5;
}
.member-features li svg {
  color: var(--inst-accent);
  flex-shrink: 0;
  margin-top: 3px;
}

/* ============================================
   Report detail page
   ============================================ */
.report-hero {
  padding: var(--space-8) 0 var(--space-7);
  border-bottom: 1px solid var(--inst-border);
}
.inst-breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  color: var(--inst-text-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-5);
  font-family: var(--font-display);
}
.inst-breadcrumb a { color: var(--inst-text-3); }
.inst-breadcrumb a:hover { color: var(--inst-accent); }
.inst-breadcrumb-sep { opacity: 0.4; }

.report-hero-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: var(--space-5);
}
.vol-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--inst-accent);
  padding: 5px 12px;
  border: 1px solid var(--inst-accent);
}

.report-hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 880px;
  margin-bottom: 20px;
}
.report-hero-subtitle {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  line-height: 1.55;
  color: var(--inst-text-2);
  max-width: 760px;
  margin-bottom: var(--space-6);
  font-weight: 400;
}

.author-row {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: var(--space-5);
  border-top: 1px solid var(--inst-border-light);
}
.author-block {
  display: flex;
  align-items: center;
  gap: 12px;
}
.inst-author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--inst-accent);
  color: var(--inst-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
}
[data-theme="dark"] .inst-author-avatar { color: #0c0e0d; }
.author-info { display: flex; flex-direction: column; line-height: 1.3; }
.author-name { font-size: 14px; font-weight: 600; color: var(--inst-text); }
.author-title { font-size: 12px; color: var(--inst-text-3); }

.pub-meta {
  margin-left: auto;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  font-size: 12px;
  color: var(--inst-text-3);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* Report body two-column */
.report-body {
  display: grid;
  grid-template-columns: 240px 1fr 240px;
  gap: var(--space-7);
  padding: var(--space-8) 0;
}

.report-toc {
  position: sticky;
  top: 100px;
  align-self: start;
  font-size: 13px;
}
.report-toc-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--inst-text-3);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--inst-border-light);
}
.report-toc ol {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  counter-reset: toc;
}
.report-toc li {
  counter-increment: toc;
  display: flex;
  gap: 10px;
  line-height: 1.5;
}
.report-toc li::before {
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--inst-text-3);
  flex-shrink: 0;
}
.report-toc a { color: var(--inst-text-2); }
.report-toc a:hover { color: var(--inst-accent); }
.report-toc li.active a { color: var(--inst-accent); font-weight: 600; }

.report-content { font-family: var(--font-serif); }
.report-content h2 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 900;
  margin: var(--space-7) 0 var(--space-4);
  letter-spacing: -0.01em;
  scroll-margin-top: 100px;
}
.report-content h2:first-child { margin-top: 0; }
.report-content h3 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 900;
  margin: var(--space-6) 0 var(--space-3);
}
.report-content p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--inst-text);
  margin-bottom: var(--space-4);
}
.report-content p + p { text-indent: 0; }
.report-content em { font-style: italic; }
.report-content strong { font-weight: 700; }

.abstract {
  background: var(--inst-bg-tertiary);
  border-left: 3px solid var(--inst-accent);
  padding: 28px 32px;
  margin-bottom: var(--space-7);
}
.abstract-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--inst-accent);
  margin-bottom: 12px;
  display: block;
}
.abstract-body {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.75;
  color: var(--inst-text-2);
  margin: 0;
}

.callout {
  border-left: 3px solid var(--inst-gold);
  background: var(--inst-gold-light);
  padding: 20px 26px;
  margin: var(--space-5) 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.7;
  color: var(--inst-text);
}
.callout-label {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--inst-gold);
  margin-bottom: 8px;
  display: block;
  font-weight: 600;
}

.figure {
  margin: var(--space-6) 0;
}
.figure-chart {
  background: var(--inst-bg-card);
  border: 1px solid var(--inst-border-light);
  padding: 32px 28px 24px;
}
.figure-caption {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--inst-text-3);
  line-height: 1.5;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--inst-border-light);
  display: flex;
  gap: 10px;
}
.figure-num {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--inst-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

.report-aside {
  position: sticky;
  top: 100px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.aside-card {
  background: var(--inst-bg-card);
  border: 1px solid var(--inst-border-light);
  padding: 22px 24px;
}
.aside-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--inst-text-3);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--inst-border-light);
}
.download-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.download-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  font-size: 13px;
  color: var(--inst-text-2);
  border-bottom: 1px dotted var(--inst-border-light);
}
.download-list a:last-child { border-bottom: none; }
.download-list a:hover { color: var(--inst-accent); }
.dl-format {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--inst-text-3);
  letter-spacing: 0.06em;
}

.cite-block {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--inst-text-3);
  background: var(--inst-bg-tertiary);
  padding: 12px 14px;
  line-height: 1.6;
  border-left: 2px solid var(--inst-accent);
  user-select: all;
}

/* ============================================
   Datasets list page
   ============================================ */
.dataset-page-hero {
  padding: var(--space-8) 0 var(--space-6);
  border-bottom: 1px solid var(--inst-border);
}
.filter-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: var(--space-4) 0 var(--space-6);
  flex-wrap: wrap;
}
.filter-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--inst-text-3);
  margin-right: 4px;
}
.filter-chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border: 1px solid var(--inst-border);
  font-size: 12px;
  color: var(--inst-text-2);
  border-radius: 16px;
  background: var(--inst-bg-card);
  cursor: pointer;
  transition: all 0.15s;
}
.filter-chip:hover { border-color: var(--inst-accent); color: var(--inst-accent); }
.filter-chip.active {
  background: var(--inst-accent);
  border-color: var(--inst-accent);
  color: var(--inst-text-inverse);
}
[data-theme="dark"] .filter-chip.active { color: #0c0e0d; }

.datasets-list-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

/* ============================================
   Dataset detail page
   ============================================ */
.dataset-detail-hero {
  padding: var(--space-8) 0 var(--space-6);
  border-bottom: 1px solid var(--inst-border);
}
.dataset-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin-bottom: 16px;
}
.dataset-stats {
  display: flex;
  gap: var(--space-7);
  margin-top: var(--space-6);
  padding-top: var(--space-5);
  border-top: 1px solid var(--inst-border-light);
}
.dataset-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.dataset-stat-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 500;
  color: var(--inst-accent);
  line-height: 1;
}
.dataset-stat-label {
  font-size: 10px;
  color: var(--inst-text-3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.dataset-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-7);
  padding: var(--space-7) 0;
}

.schema-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
  font-size: 13px;
}
.schema-table th {
  text-align: left;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--inst-text-3);
  padding: 12px 16px 10px 0;
  border-bottom: 1px solid var(--inst-border);
}
.schema-table td {
  padding: 14px 16px 14px 0;
  border-bottom: 1px solid var(--inst-border-light);
  color: var(--inst-text-2);
  vertical-align: top;
}
.schema-table .col-field {
  font-family: var(--font-mono);
  color: var(--inst-text);
  font-weight: 500;
}
.schema-table .col-type {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--inst-accent);
}

.h2-section {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 900;
  margin: var(--space-7) 0 var(--space-3);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--inst-border);
}
.h2-section:first-child { margin-top: 0; }

.preview-chart {
  background: var(--inst-bg-card);
  border: 1px solid var(--inst-border-light);
  padding: 24px;
  margin-top: 12px;
}

.source-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  margin-top: 12px;
}
.source-list li {
  padding-left: 20px;
  position: relative;
  color: var(--inst-text-2);
  line-height: 1.6;
}
.source-list li::before {
  content: '§';
  position: absolute;
  left: 0;
  color: var(--inst-accent);
  font-weight: 600;
}

/* ============================================
   Footer
   ============================================ */
.inst-footer {
  border-top: 1px solid var(--inst-border);
  background: var(--inst-bg-card);
  padding: var(--space-7) 0 var(--space-6);
  margin-top: var(--space-9);
}
.inst-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-6);
}
.foot-brand-cn {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 900;
  color: var(--inst-text);
  margin-bottom: 6px;
}
.foot-brand-en {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--inst-text-3);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.foot-tagline {
  font-size: 13px;
  line-height: 1.6;
  color: var(--inst-text-2);
  max-width: 320px;
}
.foot-heading {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--inst-text-3);
  margin-bottom: 14px;
}
.foot-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.foot-links a {
  font-size: 13px;
  color: var(--inst-text-2);
}
.foot-links a:hover { color: var(--inst-accent); }
.foot-bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 1px solid var(--inst-border-light);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--inst-text-3);
  letter-spacing: 0.04em;
}

/* ============================================
   Mobile
   ============================================ */
@media (max-width: 900px) {
  .inst-hero-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .featured-report { grid-template-columns: 1fr; gap: var(--space-5); padding: var(--space-6) 0; }
  .featured-report-cover { aspect-ratio: 16/10; max-width: 320px; }
  .reports-grid { grid-template-columns: 1fr; }
  .datasets-grid { grid-template-columns: 1fr; }
  .datasets-list-grid { grid-template-columns: 1fr; }
  .member-cta { grid-template-columns: 1fr; padding: var(--space-6); }
  .report-body { grid-template-columns: 1fr; gap: var(--space-5); }
  .report-toc, .report-aside { position: static; }
  .report-toc { display: none; }
  .dataset-content { grid-template-columns: 1fr; }
  .inst-footer-grid { grid-template-columns: 1fr 1fr; gap: var(--space-5); }
  .inst-nav-links { display: none; }
  section { padding: var(--space-6) 0; }
  .inst-container, .inst-container-narrow, .inst-container-read { padding: 0 16px; }
  .inst-hero { padding: var(--space-7) 0 var(--space-6); }
  .inst-nav { padding: 14px 16px; }
}

@media (max-width: 600px) {
  .author-row { gap: 16px; }
  .pub-meta { margin-left: 0; align-items: flex-start; }
  .featured-report-cover { aspect-ratio: 4/3; }
  .dataset-stats { gap: var(--space-5); flex-wrap: wrap; }
  .report-content p { font-size: 16px; }
}

/* ============================================
   v3.8.0 — Ghost integration additions
   ============================================ */

/* 子栏目品牌条 (在主刊 nav 下方显示) */
/* Subbar — quiet secondary nav matching the main header style.
   Drops the prominent brand block so it doesn't compete with the
   primary nav above. Just a thin label + right-aligned links. */
.inst-subbar {
  background: #ffffff;
  border-bottom: 1px solid var(--border, #e5e7eb);
  position: relative;
  z-index: 5;
}
.inst-subbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 24px;
  gap: 24px;
  flex-wrap: wrap;
  max-width: 1280px;
  margin: 0 auto;
}
/* hide the big brand mark + serif title — keep only the CN label as a quiet text */
.inst-subbar .inst-brand-mark,
.inst-subbar .inst-brand-en { display: none !important; }
.inst-subbar .inst-brand {
  display: flex;
  align-items: center;
  gap: 0;
  text-decoration: none;
  color: var(--text-secondary, #64748b);
}
.inst-subbar .inst-brand-cn {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary, #64748b);
  letter-spacing: 0.02em;
}
.inst-subbar .inst-nav-links {
  display: flex;
  list-style: none;
  gap: 24px;
  margin: 0;
  padding: 0;
}
.inst-subbar .inst-nav-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary, #64748b);
  letter-spacing: 0.02em;
  text-decoration: none;
  position: relative;
  padding: 4px 0;
}
.inst-subbar .inst-nav-link.active {
  color: var(--accent, #1e3a5f);
}
[data-theme="dark"] .inst-subbar {
  background: var(--bg-primary);
  border-bottom-color: var(--border);
}

/* dataset detail meta row */
.dataset-meta-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

/* public/会员 indicator badge in dataset cards */
.dataset-meta-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--inst-border);
}
.dataset-meta-badge.public {
  color: var(--inst-accent);
  border-color: var(--inst-accent);
  background: var(--inst-accent-light);
}
.dataset-meta-badge.member {
  color: var(--inst-gold);
  border-color: var(--inst-gold);
  background: var(--inst-gold-light);
}

/* report card title link */
.report-card-title a { color: inherit; text-decoration: none; }
.report-card-title a:hover { color: var(--inst-accent); }

/* small mobile nav adjust */
@media (max-width: 600px) {
  .inst-subbar-inner { padding: 10px 16px; gap: 12px; }
  .inst-subbar .inst-nav-links { gap: 14px; }
  .inst-subbar .inst-nav-link { font-size: 12px; }
}

/* respect main theme dark mode toggle so /institute uses the same theme switch */
html[data-theme="dark"] .inst-page,
[data-theme="dark"] .inst-page {
  --inst-bg: #080d14;
  --inst-bg-card: #111722;
  --inst-bg-tertiary: #161d2a;
  --inst-bg-elevated: #1a2030;
  --inst-text: #e8e4d6;
  --inst-text-2: #a8aebc;
  --inst-text-3: #6a7280;
  --inst-text-inverse: #080d14;
  --inst-accent: #c9a875;
  --inst-accent-hover: #dcbe8c;
  --inst-accent-light: rgba(201, 168, 117, 0.1);
  --inst-accent-glow: rgba(201, 168, 117, 0.18);
  --inst-gold: #c9a875;
  --inst-gold-light: rgba(201, 168, 117, 0.12);
  --inst-border: #232b3a;
  --inst-border-light: #1a2030;
  --inst-border-strong: #3a4458;
}