/* T106 主站共享样式 — 干净清爽 + fancy */
:root {
  --bg: #fafbfc;
  --surface: #ffffff;
  --ink: #1c1e21;
  --ink-2: #5f6368;
  --ink-3: #9aa0a6;
  --line: #e8eaed;
  --accent: #2563eb;
  --accent-2: #7c3aed;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);
  --shadow-hover: 0 2px 4px rgba(0,0,0,.05), 0 16px 40px rgba(37,99,235,.12);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 导航栏 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  background: rgba(250,251,252,.75);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 24px;
  height: 60px; display: flex; align-items: center; gap: 28px;
}
.nav-brand {
  font-weight: 700; font-size: 17px; color: var(--ink); text-decoration: none;
  letter-spacing: .5px;
}
.nav-brand span { color: var(--accent); }
.nav-links { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav-links a {
  color: var(--ink-2); text-decoration: none; font-size: 14.5px;
  padding: 6px 12px; border-radius: 8px;
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--ink); background: rgba(0,0,0,.05); }
.nav-links a.active { color: var(--accent); font-weight: 600; }

/* ---------- 布局 ---------- */
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; }

/* ---------- 入场动画 ---------- */
@keyframes rise {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: none; }
}
.rise { animation: rise .7s cubic-bezier(.22,1,.36,1) both; }
.rise-1 { animation-delay: .08s; }
.rise-2 { animation-delay: .16s; }
.rise-3 { animation-delay: .24s; }
.rise-4 { animation-delay: .32s; }
.rise-5 { animation-delay: .40s; }

/* ---------- 主页 Hero ---------- */
.hero { padding: 96px 0 64px; text-align: center; }
.hero .kicker {
  display: inline-block; font-size: 13px; letter-spacing: 2px;
  color: var(--accent); font-weight: 600; text-transform: uppercase;
  padding: 4px 14px; border: 1px solid rgba(37,99,235,.25); border-radius: 999px;
  background: rgba(37,99,235,.05);
}
.hero h1 {
  margin-top: 24px; font-size: clamp(34px, 6vw, 56px); line-height: 1.2;
  font-weight: 800; letter-spacing: -1px;
  background: linear-gradient(120deg, var(--ink) 30%, var(--accent) 70%, var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.sub {
  margin: 20px auto 0; max-width: 560px;
  color: var(--ink-2); font-size: 17px;
}

/* ---------- 版块卡片 ---------- */
.grid {
  display: grid; gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.card {
  display: block; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 28px; text-decoration: none; color: inherit;
  box-shadow: var(--shadow);
  transition: transform .25s cubic-bezier(.22,1,.36,1), box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: rgba(37,99,235,.35); }
.card .icon { font-size: 30px; }
.card h3 { margin-top: 14px; font-size: 19px; font-weight: 700; }
.card p { margin-top: 8px; color: var(--ink-2); font-size: 14.5px; }
.card .go {
  margin-top: 16px; display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent); font-size: 14px; font-weight: 600;
}
.card .go::after { content: "→"; transition: transform .2s; }
.card:hover .go::after { transform: translateX(4px); }

/* ---------- 版块页 ---------- */
.page-hero { padding: 64px 0 40px; }
.page-hero .crumb { font-size: 13.5px; color: var(--ink-3); }
.page-hero .crumb a { color: var(--ink-2); text-decoration: none; }
.page-hero .crumb a:hover { color: var(--accent); }
.page-hero h1 { margin-top: 12px; font-size: clamp(28px, 4vw, 40px); font-weight: 800; letter-spacing: -.5px; }
.page-hero .lede { margin-top: 12px; color: var(--ink-2); max-width: 640px; }

/* 目录条目 */
.entry {
  display: flex; gap: 20px; align-items: baseline;
  padding: 22px 24px; background: var(--surface);
  border: 1px solid var(--line); border-radius: var(--radius);
  text-decoration: none; color: inherit; box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.entry:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); border-color: rgba(37,99,235,.35); }
.entry + .entry { margin-top: 14px; }
.entry .no { color: var(--ink-3); font-variant-numeric: tabular-nums; font-size: 14px; min-width: 28px; }
.entry h3 { font-size: 16.5px; font-weight: 650; }
.entry .desc { color: var(--ink-2); font-size: 14px; margin-top: 2px; }
.entry .date { margin-left: auto; color: var(--ink-3); font-size: 13px; white-space: nowrap; }

/* 占位提示 */
.placeholder {
  border: 1.5px dashed var(--line); border-radius: var(--radius);
  padding: 40px; text-align: center; color: var(--ink-3); font-size: 14.5px;
}

/* ---------- 内容页 ---------- */
.article { max-width: 720px; margin: 0 auto; padding: 56px 24px 96px; }
.article h1 { font-size: clamp(26px, 4vw, 36px); font-weight: 800; letter-spacing: -.5px; }
.article .meta { margin-top: 10px; color: var(--ink-3); font-size: 14px; }
.article .body { margin-top: 32px; font-size: 16.5px; }
.article .body p + p { margin-top: 1em; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--line); padding: 32px 0;
  text-align: center; color: var(--ink-3); font-size: 13px;
}
.footer a { color: var(--ink-2); text-decoration: none; }
.footer a:hover { color: var(--accent); }

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .nav-inner { height: auto; padding: 12px 16px; flex-direction: column; align-items: flex-start; gap: 8px; }
  .nav-links { margin-left: 0; }
  .section { padding: 48px 0; }
  .hero { padding: 56px 0 40px; }
  .entry { flex-wrap: wrap; }
  .entry .date { margin-left: 0; width: 100%; }
}