:root {
  --bg: #f4f7f9;
  --surface: #ffffff;
  --surface-2: #eef3f7;
  --text: #142433;
  --muted: #5a6d7d;
  --faint: #8a9bab;
  --border: #d8e3ec;
  --brand: #1a5f7a;
  --brand-2: #0e3d52;
  --accent: #c9a227;
  --accent-soft: #f5ecd4;
  --teal: #2a9d8f;
  --teal-soft: #d4f0ec;
  --shadow: 0 1px 2px rgba(20,36,51,.05), 0 8px 28px -10px rgba(20,36,51,.16);
  --radius: 14px;
  --maxw: 1100px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1218;
    --surface: #121c26;
    --surface-2: #182430;
    --text: #e8eef4;
    --muted: #9aadb8;
    --faint: #6d8290;
    --border: #243442;
    --brand: #4db8d4;
    --brand-2: #7dd3e8;
    --accent: #e0c060;
    --accent-soft: #2a2410;
    --teal: #3ecfb8;
    --teal-soft: #123530;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 32px -12px rgba(0,0,0,.55);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Topbar */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
@media (prefers-color-scheme: dark) {
  .topbar { background: rgba(18,28,38,.92); }
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto; padding: 12px 22px; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 15px; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 32px; height: 32px; border-radius: 8px; background: linear-gradient(135deg, #1a5f7a, #0e3d52); display: grid; place-items: center; color: #c9a227; font-size: 14px; font-weight: 800; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 13.5px; }
.nav a { color: var(--muted); text-decoration: none; white-space: nowrap; }
.nav a:hover { color: var(--brand); text-decoration: none; }
.nav-toggle { display: none; background: none; border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; cursor: pointer; color: var(--text); }
@media (max-width: 768px) {
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--surface); border-bottom: 1px solid var(--border); padding: 12px 22px; flex-direction: column; }
  .nav.open { display: flex; }
  .nav-toggle { display: block; }
  .topbar { position: relative; }
}

/* Hero */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(900px 400px at 90% -20%, rgba(42,157,143,.25), transparent 55%),
    radial-gradient(700px 350px at 0% 100%, rgba(201,162,39,.18), transparent 50%),
    linear-gradient(160deg, #0e3d52 0%, #1a5f7a 45%, #164a63 100%);
  color: #eaf4f8;
  padding: 56px 0 48px;
}
.hero-inner { position: relative; z-index: 1; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.badge {
  display: inline-flex; align-items: center;
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px; padding: 5px 13px; font-size: 12.5px; font-weight: 500;
}
.badge-gold { background: rgba(201,162,39,.25); border-color: rgba(201,162,39,.4); color: #f5e6b8; }
.hero-title { font-size: clamp(32px, 5vw, 52px); line-height: 1.12; margin: 0 0 10px; font-weight: 800; letter-spacing: -.3px; }
.hero-title em { font-style: normal; color: #7dd3e8; }
.hero-sub { margin: 0 0 8px; font-size: clamp(15px, 2vw, 18px); color: #b8d8e8; font-weight: 400; }
.hero-en { margin: 0 0 24px; font-size: 14px; color: #8ec4d8; letter-spacing: .04em; }
.hero-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 14px; margin-top: 28px; }
.stat {
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14);
  border-radius: 12px; padding: 16px 18px;
}
.stat-num { font-size: 28px; font-weight: 800; color: #fff; line-height: 1.1; }
.stat-num span { font-size: 16px; font-weight: 600; color: #c9a227; }
.stat-label { font-size: 12.5px; color: #9ec8dc; margin-top: 4px; }

/* Sections */
main { padding: 40px 0 64px; }
.section { margin-bottom: 48px; }
.section-head { margin-bottom: 22px; }
.section-head h2 { font-size: 24px; font-weight: 750; margin: 0 0 6px; letter-spacing: -.2px; }
.section-head .en { font-size: 13px; color: var(--faint); font-weight: 500; }
.section-head p { margin: 8px 0 0; color: var(--muted); font-size: 15px; max-width: 720px; }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 26px 28px;
}
.card + .card { margin-top: 16px; }
.card h3 { margin: 0 0 12px; font-size: 17px; font-weight: 700; color: var(--brand-2); }
.card p { margin: 0 0 12px; font-size: 15px; }
.card p:last-child { margin-bottom: 0; }
.card ul { margin: 8px 0 0; padding-left: 20px; font-size: 14.5px; }
.card li { margin-bottom: 6px; }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }

/* Timeline */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px;
  width: 2px; background: var(--border);
}
.tl-item { position: relative; margin-bottom: 22px; }
.tl-item::before {
  content: ""; position: absolute; left: -24px; top: 7px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--brand); border: 2px solid var(--surface);
  box-shadow: 0 0 0 2px var(--brand);
}
.tl-item.highlight::before { background: var(--accent); box-shadow: 0 0 0 2px var(--accent); }
.tl-year { font-weight: 800; font-size: 14px; color: var(--brand); margin-bottom: 2px; }
.tl-text { font-size: 14.5px; color: var(--text); }

/* Tags */
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.tag {
  display: inline-block; background: var(--teal-soft); color: var(--brand-2);
  border-radius: 6px; padding: 4px 10px; font-size: 12.5px; font-weight: 500;
}

/* Quote */
.quote {
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 18px 22px; margin: 20px 0;
  font-size: 15.5px; font-style: italic; color: var(--text);
}
.quote cite { display: block; margin-top: 10px; font-style: normal; font-size: 13px; color: var(--muted); }

/* News cards */
.news-card { padding: 20px 22px; }
.news-date { font-size: 12px; color: var(--faint); margin-bottom: 6px; }
.news-title { font-size: 15.5px; font-weight: 650; margin: 0 0 8px; line-height: 1.4; }
.news-title a { color: var(--text); }
.news-snippet { font-size: 14px; color: var(--muted); margin: 0; }

/* Sources */
.sources { font-size: 13.5px; }
.sources li { margin-bottom: 8px; word-break: break-all; }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  padding: 28px 0;
  font-size: 13px; color: var(--muted);
}
.foot-inner { display: flex; flex-direction: column; gap: 8px; }

/* WeChat article feature */
.article-feature { border-left: 4px solid var(--accent); }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 14px; }
.article-tag {
  background: var(--accent); color: #1a1206; font-size: 11px; font-weight: 700;
  padding: 3px 10px; border-radius: 4px; letter-spacing: .06em; text-transform: uppercase;
}
.article-date { font-size: 13px; color: var(--muted); }
.article-title { font-size: 20px; font-weight: 750; margin: 0 0 12px; line-height: 1.35; }
.article-lead { font-size: 15.5px; margin: 0 0 20px; }
.article-highlights {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px;
}
.ah-item {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px;
  padding: 14px; text-align: center;
}
.ah-item strong { display: block; font-size: 18px; color: var(--brand-2); margin-bottom: 2px; }
.ah-item span { font-size: 12px; color: var(--muted); }

.office-items { display: flex; flex-direction: column; gap: 16px; margin-top: 16px; }
.office-item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 16px; background: var(--surface-2); border-radius: 10px; border: 1px solid var(--border);
}
.office-icon {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 10px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; display: grid; place-items: center; font-size: 18px; font-weight: 800;
}
.office-item strong { display: block; margin-bottom: 4px; font-size: 15px; }
.office-item p { margin: 0; font-size: 14px; color: var(--muted); }

.pillar-card { position: relative; }
.pillar-num {
  position: absolute; top: 18px; right: 20px;
  font-size: 28px; font-weight: 900; color: var(--border); line-height: 1;
}
@media (prefers-color-scheme: dark) {
  .pillar-num { color: var(--surface-2); }
  .article-tag { color: #1a1206; }
}

/* Collaboration section */
.collab-thesis { border-left: 4px solid var(--teal); }
.collab-priority-label {
  font-size: 13px; font-weight: 700; color: var(--brand);
  margin: 28px 0 14px; letter-spacing: .04em;
}
.collab-card { position: relative; padding-top: 22px; }
.collab-card.p0 { border-top: 3px solid var(--accent); }
.collab-card.p1 { border-top: 3px solid var(--border); }
.collab-badge {
  display: inline-block; font-size: 11px; font-weight: 700;
  background: var(--accent-soft); color: var(--brand-2);
  padding: 3px 10px; border-radius: 4px; margin-bottom: 10px;
}
.p1-badge { background: var(--surface-2); color: var(--muted); }
.collab-fit {
  margin: 12px 0 0; padding: 10px 14px;
  background: var(--teal-soft); border-radius: 8px;
  font-size: 13.5px; color: var(--brand-2);
}
.collab-entry { border: 2px solid var(--brand); background: linear-gradient(135deg, var(--surface) 0%, var(--surface-2) 100%); }
.entry-steps { margin: 0; padding-left: 22px; }
.entry-steps li { margin-bottom: 16px; font-size: 14.5px; }
.entry-steps li strong { display: block; color: var(--brand-2); margin-bottom: 4px; }
.entry-steps li span { color: var(--muted); }