:root {
  --bg: #f7f7f4;
  --text: #202124;
  --muted: #6b7280;
  --line: #e5e7eb;
  --soft: #f1f2ee;
  --accent: #0f766e;
  --max: 1120px;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 4px; }

.page {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  padding: 34px 0 58px;
}

.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.brand { font-weight: 760; letter-spacing: -0.03em; font-size: 22px; }
.nav { display: flex; gap: 16px; color: var(--muted); font-size: 14px; }
.nav a.active { color: var(--text); font-weight: 650; }

header.hero { padding: 42px 0 30px; }
.school { margin: 0 0 8px; color: var(--muted); font-size: 15px; }
h1 { margin: 0; font-size: clamp(34px, 7vw, 56px); line-height: 1.1; letter-spacing: -0.045em; }
.intro { margin: 16px 0 0; max-width: 620px; color: var(--muted); font-size: 17px; }

section { padding: 28px 0; border-top: 1px solid var(--line); }
h2 { margin: 0 0 16px; font-size: 20px; letter-spacing: -0.03em; }
h3 { margin: 0; font-size: 17px; letter-spacing: -0.02em; }
p { margin: 0 0 16px; }

.post-list { margin: 0; padding: 0; list-style: none; }
.post-list li { padding: 18px 0; border-bottom: 1px solid var(--line); }
.meta { display: flex; gap: 10px; flex-wrap: wrap; margin: 6px 0 8px; color: var(--muted); font-size: 13px; }
.summary { margin: 0; color: var(--muted); font-size: 15px; }

.link-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.link-list li { display: grid; grid-template-columns: 180px 1fr; gap: 18px; padding: 10px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.desc { color: var(--muted); font-size: 14px; }

.group-note { margin: -6px 0 16px; color: var(--muted); font-size: 14px; }
.tag { color: var(--muted); font-size: 12px; }

.home-layout {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 28px;
  align-items: start;
  padding-top: 34px;
}

.home-intro {
  position: sticky;
  top: 24px;
  padding: 24px;
  border: 1px solid var(--line);
  background: #ffffff;
}

.home-intro h1 { font-size: clamp(40px, 5vw, 58px); }
.home-intro .intro { font-size: 16px; }

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.quick-links a {
  padding: 6px 10px;
  border: 1px solid var(--line);
  background: var(--soft);
  font-size: 13px;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.nav-card {
  padding: 20px;
  border: 1px solid var(--line);
  background: #ffffff;
}

.nav-card h2 {
  margin-bottom: 4px;
  font-size: 18px;
}

.nav-card .group-note {
  margin: 0 0 14px;
}

.card-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.card-links li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 7px 0;
  border-top: 1px solid var(--line);
}

.card-links li:first-child { border-top: 0; }

.card-links .desc {
  flex: 0 0 auto;
  max-width: 190px;
  text-align: right;
}

.note {
  margin-top: 18px;
  padding: 16px 18px;
  background: var(--soft);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.article { padding-top: 36px; }
.article h1 { margin-bottom: 12px; }
.article h2 { margin-top: 34px; }
.article ul { padding-left: 1.25em; }
.article li { margin: 8px 0; }

footer { margin-top: 30px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }

@media (max-width: 620px) {
  .page { padding-top: 28px; }
  .top { display: block; }
  .nav { margin-top: 12px; }
  .link-list li { grid-template-columns: 1fr; gap: 0; padding: 12px 0; }
}

@media (max-width: 900px) {
  .home-layout { grid-template-columns: 1fr; }
  .home-intro { position: static; }
}

@media (max-width: 720px) {
  .nav-grid { grid-template-columns: 1fr; }
  .card-links li { display: block; }
  .card-links .desc { display: block; max-width: none; text-align: left; }
}