:root {
  --bg: #f7f7f4;
  --ink: #1f2420;
  --muted: #5c655e;
  --line: #d8dbd4;
  --card: #ffffff;
  --accent: #2f6f4e;
  --warn-bg: #fff7e8;
  --warn-ink: #7a4e00;
  --radius: 14px;
  --max: 720px;
  font-family: "PingFang SC", "Noto Sans SC", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem 3rem; }
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 0 0.5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}
.brand { font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: 0.02em; }
.nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--muted); }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }

h1 { font-size: clamp(1.6rem, 4vw, 2.1rem); line-height: 1.25; margin: 0 0 0.75rem; }
h2 { font-size: 1.15rem; margin: 1.75rem 0 0.5rem; }
p, li { color: var(--ink); }
.lead { color: var(--muted); font-size: 1.05rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  margin: 1.25rem 0;
}
.meta { list-style: none; padding: 0; margin: 0; }
.meta li { padding: 0.35rem 0; border-bottom: 1px solid var(--line); }
.meta li:last-child { border-bottom: 0; }
.meta strong { display: inline-block; min-width: 7.5rem; color: var(--muted); font-weight: 600; }
.lang-block { margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--line); }
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: #e8f3ec;
  color: var(--accent);
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}
.todo {
  background: var(--warn-bg);
  color: var(--warn-ink);
  border: 1px dashed #e0b45a;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  margin: 0.85rem 0;
  font-size: 0.95rem;
}
.todo strong { color: #5c3a00; }
.site-footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}
.small { font-size: 0.92rem; color: var(--muted); }