:root {
  --bg: #f6f3ee;
  --ink: #1c1917;
  --muted: #57534e;
  --card: #fffdf9;
  --line: #e7e0d5;
  --accent: #0f766e;
  --accent-soft: #ccfbf1;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, #ddf4ef 0, transparent 42%),
    linear-gradient(180deg, #f8f5f0, var(--bg));
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(960px, calc(100% - 2rem)); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  backdrop-filter: blur(10px);
  background: rgba(246, 243, 238, 0.88);
  border-bottom: 1px solid var(--line);
  z-index: 10;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
}
.logo {
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 0.02em;
}
nav { display: flex; flex-wrap: wrap; gap: 0.85rem; }
nav a { color: var(--muted); font-size: 0.95rem; }

.hero { padding: 2.8rem 0 1.5rem; }
.eyebrow {
  display: inline-block;
  margin: 0 0 0.8rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
}
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.25; margin: 0 0 1rem; }
.lead { font-size: 1.08rem; color: var(--muted); max-width: 42rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin: 1rem 0 2rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.2rem;
  box-shadow: 0 10px 30px rgba(28, 25, 23, 0.04);
}
.card h2 { font-size: 1.15rem; margin: 0 0 0.6rem; }
.card p { margin: 0; color: var(--muted); }

.prose {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}
.prose h2 { margin-top: 0; }
.prose ul { padding-left: 1.2rem; }
code {
  background: #f5f0e8;
  padding: 0.1rem 0.35rem;
  border-radius: 6px;
  font-size: 0.92em;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 640px) {
  .site-header .wrap { flex-direction: column; align-items: flex-start; }
}