:root {
  --bg: #f6f3ec;
  --bg2: #efe9dc;
  --ink: #1c1a16;
  --muted: #5c574c;
  --line: #d9d1bf;
  --accent: #0f6a5a;
  --accent2: #b45309;
  --card: #fffcf6;
  --shadow: 0 10px 30px rgba(28, 26, 22, 0.06);
  --radius: 18px;
  --mono: "IBM Plex Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  --sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #e7f2ee 0%, transparent 55%),
    radial-gradient(900px 420px at 100% 0%, #f7e7d2 0%, transparent 50%),
    var(--bg);
  line-height: 1.7;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent2); }
.wrap { width: min(1080px, calc(100% - 2rem)); margin: 0 auto; }
.top {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(246, 243, 236, 0.86);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.9rem 0;
}
.brand { display: flex; align-items: center; gap: 0.7rem; color: inherit; text-decoration: none; }
.brand svg { width: 34px; height: 34px; }
.brand strong { font-size: 1.05rem; letter-spacing: 0.02em; }
.brand span { display: block; font-size: 0.75rem; color: var(--muted); }
.menu { display: flex; flex-wrap: wrap; gap: 0.85rem 1.1rem; font-size: 0.95rem; }
.menu a { color: var(--ink); text-decoration: none; }
.menu a:hover { color: var(--accent); }
.hero {
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 1.5rem;
  padding: 2.4rem 0 1.2rem;
}
@media (max-width: 860px) { .hero { grid-template-columns: 1fr; } .menu { justify-content: flex-end; } }
.hero-card, .panel {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.hero-card { padding: 1.6rem 1.7rem; }
.kicker {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-family: var(--mono); font-size: 0.78rem; color: var(--accent);
  background: #e8f4f0; border: 1px solid #c7e3da; border-radius: 999px;
  padding: 0.18rem 0.65rem;
}
h1 { font-size: clamp(1.7rem, 3vw, 2.35rem); line-height: 1.25; margin: 0.85rem 0 0.7rem; }
.lead { color: var(--muted); font-size: 1.05rem; margin: 0 0 1.2rem; }
.cta { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  border-radius: 999px; padding: 0.55rem 1rem; border: 1px solid var(--ink);
  color: var(--ink); text-decoration: none; background: #fff;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn:hover { transform: translateY(-1px); }
.side {
  padding: 1.2rem 1.3rem; display: grid; gap: 0.9rem; align-content: start;
}
.meter { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); }
.meter b { color: var(--ink); }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; padding: 0.4rem 0 2rem; }
@media (max-width: 860px) { .grid { grid-template-columns: 1fr; } }
.card { padding: 1.15rem 1.2rem; }
.card h3 { margin: 0.2rem 0 0.45rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.meta { font-family: var(--mono); font-size: 0.75rem; color: var(--muted); margin-bottom: 0.35rem; }
.section { padding: 0.5rem 0 2rem; }
.section h2 { margin: 0 0 0.9rem; font-size: 1.35rem; }
.list { display: grid; gap: 0.8rem; }
.item {
  display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem;
  padding: 1rem 1.1rem; background: var(--card); border: 1px solid var(--line);
  border-radius: 14px;
}
@media (max-width: 640px) { .item { grid-template-columns: 1fr; } }
.item time { font-family: var(--mono); font-size: 0.78rem; color: var(--muted); }
.item h3 { margin: 0 0 0.3rem; font-size: 1.05rem; }
.item p { margin: 0; color: var(--muted); }
.footer {
  border-top: 1px solid var(--line); padding: 1.4rem 0 2.2rem; color: var(--muted); font-size: 0.9rem;
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.prose { max-width: 72ch; padding: 1.6rem 0 2.4rem; }
.prose h1 { margin-top: 0; }
.prose h2 { margin-top: 1.8rem; }
.prose code, .mono { font-family: var(--mono); font-size: 0.9em; }
.note {
  border-left: 3px solid var(--accent); background: #eef7f4;
  padding: 0.8rem 1rem; border-radius: 0 12px 12px 0; margin: 1.2rem 0;
}
.tag { display: inline-block; font-size: 0.75rem; border: 1px solid var(--line); border-radius: 999px; padding: 0.1rem 0.55rem; margin-right: 0.3rem; color: var(--muted); }
.illu { width: 100%; height: auto; display: block; border-radius: 14px; border: 1px solid var(--line); background: #fff; }
.err { text-align: center; padding: 4rem 1rem 5rem; }
.err code { font-family: var(--mono); }