:root {
  color-scheme: light;
  --ink: #1b1b18;
  --muted: #706b62;
  --soft: #f6f3ed;
  --paper: #fbfaf7;
  --panel: #ffffff;
  --line: #ded8cd;
  --accent: #1f5f5b;
  --accent-2: #8d5132;
  --accent-soft: #e4f0ed;
  --shadow: 0 18px 50px rgba(42, 35, 25, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}
a { color: inherit; }
.site {
  display: grid;
  grid-template-columns: 304px minmax(0, 1fr);
  min-height: 100vh;
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 22px;
  border-right: 1px solid var(--line);
  background: rgba(251, 250, 247, 0.95);
  backdrop-filter: blur(18px);
  overflow-y: auto;
}
.brand {
  display: block;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}
.brand span {
  display: block;
  font-size: 23px;
  font-weight: 760;
  line-height: 1.2;
  letter-spacing: 0;
}
.brand small {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}
.nav {
  display: grid;
  gap: 8px;
  margin-top: 24px;
}
.nav a {
  display: block;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
}
.nav a:hover,
.nav a:focus,
.nav a.active {
  border-color: #bdd3ce;
  background: var(--accent-soft);
  outline: none;
}
.main {
  min-width: 0;
  padding: 42px min(5vw, 72px) 78px;
}
.hero,
.article-shell {
  max-width: 980px;
  margin: 0 auto;
}
.kicker {
  margin: 0 0 10px;
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 700;
}
h1 {
  margin: 0;
  font-size: clamp(30px, 4.2vw, 56px);
  line-height: 1.12;
  letter-spacing: 0;
}
.lede {
  max-width: 780px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}
.summary-grid {
  display: grid;
  gap: 18px;
  max-width: 980px;
  margin: 34px auto 0;
}
.summary-card {
  display: grid;
  gap: 16px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.summary-card h2 {
  margin: 0;
  font-size: 23px;
  line-height: 1.35;
  letter-spacing: 0;
}
.summary-card p {
  margin: 0;
  color: #34302a;
}
.summary-card ul {
  margin: 0;
  padding-left: 20px;
  color: #34302a;
}
.summary-card li + li { margin-top: 6px; }
.card-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 4px;
}
.read-link {
  flex: 0 0 auto;
  padding: 8px 13px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}
.read-link:hover,
.read-link:focus {
  background: var(--accent);
  color: #fff;
  outline: none;
}
.article-head {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.article-head h1 {
  max-width: 940px;
  font-size: clamp(27px, 3.4vw, 44px);
}
.article-body {
  margin: 26px 0 0;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  box-shadow: var(--shadow);
  white-space: pre-wrap;
  word-break: break-word;
  overflow-wrap: anywhere;
  color: #24211c;
  font: 16px/1.88 "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  letter-spacing: 0;
}
.article-body a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.article-body a:hover,
.article-body a:focus {
  color: var(--accent-2);
  outline: none;
}
.back-row {
  margin-top: 24px;
}
.back-row a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
@media (max-width: 880px) {
  .site { display: block; }
  .sidebar {
    position: relative;
    height: auto;
    padding: 20px 18px 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .brand { padding-bottom: 16px; }
  .nav { margin-top: 16px; }
  .main { padding: 28px 14px 46px; }
  .summary-card { padding: 20px 18px; }
  .summary-card h2 { font-size: 20px; }
  .card-actions {
    display: grid;
    justify-content: stretch;
  }
  .read-link { text-align: center; }
  .article-body {
    padding: 20px 18px 26px;
    font-size: 15px;
    line-height: 1.84;
  }
}

.article-summary {
  max-width: 820px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
}