:root {
  --bg: #f6f4ef;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #687385;
  --line: #e6e1d7;
  --accent: #6f4e37;
  --accent-2: #8a6a50;
  --nav-bg: #f1ede5;
  --code-bg: #f7f7f5;
  --shadow: 0 18px 50px rgba(31, 41, 51, 0.08);
  --max: 1240px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
  line-height: 1.75;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-overview {
  background:
    radial-gradient(circle at 10% 0%, rgba(138, 106, 80, .16), transparent 32%),
    linear-gradient(135deg, #fffaf2, #f2ebdf 58%, #e8ded0);
  border-bottom: 1px solid var(--line);
}
.overview-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 42px clamp(20px, 5vw, 56px) 34px;
}
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  background: rgba(255,255,255,.72);
  border: 1px solid #deceb9;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .06em;
  margin-bottom: 16px;
}
.hero-title {
  margin: 0;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1.12;
  letter-spacing: -.035em;
  color: #1f2933;
}
.hero-subtitle {
  margin: 12px 0 0;
  font-size: clamp(17px, 2.2vw, 24px);
  line-height: 1.5;
  color: #4d5664;
  font-weight: 700;
}
.hero-judgement {
  margin: 24px 0 0;
  max-width: 980px;
  background: rgba(255,255,255,.76);
  border: 1px solid #dfd1c0;
  border-left: 5px solid var(--accent-2);
  border-radius: 18px;
  padding: 18px 22px;
  color: #2f3944;
  font-size: 16px;
  line-height: 1.85;
  box-shadow: 0 12px 36px rgba(31,41,51,.06);
}
.content-shell {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 28px;
  padding: 28px clamp(20px, 5vw, 56px) 54px;
}
.sidebar {
  position: sticky;
  top: 22px;
  height: calc(100vh - 44px);
  overflow-y: auto;
  background: var(--nav-bg);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 12px 34px rgba(31,41,51,.05);
}
.nav-head { margin-bottom: 18px; }
.nav-title { font-size: 18px; font-weight: 900; color: var(--ink); }
.nav-subtitle { font-size: 12px; color: var(--muted); margin-top: 5px; line-height: 1.55; }
.nav-scroll { flex: 1 1 auto; }
.nav-group { margin: 16px 0 22px; }
.nav-group-title { color: var(--muted); font-size: 12px; font-weight: 800; letter-spacing: 0.08em; margin: 0 0 8px; }
.nav-link {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--ink);
  padding: 10px 12px;
  border-radius: 12px;
  margin: 4px 0;
  font-size: 14px;
  line-height: 1.45;
  border: 1px solid transparent;
}
.nav-link:hover { background: rgba(255,255,255,.65); text-decoration: none; border-color: var(--line); }
.nav-link.active { background: var(--panel); color: var(--accent); border-color: #dacdbf; box-shadow: 0 8px 20px rgba(31,41,51,.06); font-weight: 800; }
.nav-no { color: var(--accent-2); min-width: 22px; }
.sidebar-copyright {
  flex: 0 0 auto;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}
.main { min-width: 0; }
.article-wrap { max-width: 900px; margin: 0 auto; }
.article-toolbar {
  position: sticky;
  top: 12px;
  z-index: 5;
  display: flex;
  justify-content: flex-end;
  padding: 0 0 14px;
  background: linear-gradient(to bottom, var(--bg) 70%, rgba(246,244,239,0));
}
.pdf-button {
  appearance: none;
  border: 1px solid #cbbba9;
  background: var(--panel);
  color: var(--accent);
  border-radius: 999px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(31,41,51,.08);
}
.pdf-button:hover { background: #fffaf4; }
.article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: clamp(26px, 4vw, 58px);
  margin-bottom: 34px;
}
.article h1 { font-size: clamp(28px, 4vw, 42px); line-height: 1.24; margin: 0 0 16px; letter-spacing: -0.02em; }
.article h2 { font-size: 24px; line-height: 1.35; margin: 48px 0 18px; padding-top: 8px; border-top: 1px solid var(--line); }
.article h3 { font-size: 19px; line-height: 1.45; margin: 32px 0 12px; }
.article h4 { font-size: 16px; margin: 24px 0 10px; color: var(--muted); }
.article p { margin: 14px 0; }
.article blockquote {
  margin: 22px 0;
  padding: 16px 20px;
  border-left: 5px solid var(--accent-2);
  background: #fbf8f2;
  border-radius: 0 14px 14px 0;
  color: #2f3944;
}
.article blockquote p { margin: 0.35em 0; }
.article hr { border: none; border-top: 1px solid var(--line); margin: 24px 0; }
.article ul, .article ol { padding-left: 1.5em; }
.article li { margin: 6px 0; }
.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 22px 0;
  overflow: hidden;
  border-radius: 14px;
  display: table;
}
.article th, .article td { border: 1px solid var(--line); padding: 10px 12px; vertical-align: top; }
.article th { background: #f5f0e8; font-weight: 800; }
.article code { background: var(--code-bg); padding: 2px 5px; border-radius: 5px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .92em; }
.article pre { background: var(--code-bg); padding: 16px; border-radius: 14px; overflow: auto; }
.footer-note { color: var(--muted); font-size: 12px; text-align: center; margin: 12px 0 0; }
.mobile-nav { display: none; margin-bottom: 16px; }
.mobile-nav select { width: 100%; padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); font-size: 15px; }

/* Topbar */
.topbar {
  background: rgba(255, 253, 248, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
.topbar-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 56px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.topbar-brand {
  font-weight: 800;
  color: var(--accent);
  font-size: 15px;
  letter-spacing: 0.02em;
}
.topbar-nav {
  display: flex;
  gap: 12px;
}
.topbar-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  transition: all 0.2s ease;
}
.topbar-nav a:hover {
  background: var(--nav-bg);
  border-color: rgba(111, 78, 55, 0.4);
  color: var(--accent);
  text-decoration: none;
}
@media (max-width: 560px) {
  .topbar-brand { display: none; }
  .topbar-inner { justify-content: center; }
}

@media (max-width: 980px) {
  .content-shell { display: block; padding: 20px 18px 42px; }
  .sidebar { display: none; }
  .mobile-nav { display: block; }
  .article { border-radius: 18px; padding: 24px 18px; }
  .article-toolbar { top: 0; }
  .overview-inner { padding: 32px 18px 26px; }
  .hero-judgement { font-size: 15px; padding: 16px 18px; }
}
@media print {
  @page { margin: 18mm; }
  body { background: #fff; }
  .site-overview, .sidebar, .mobile-nav, .article-toolbar, .footer-note { display: none !important; }
  .content-shell { display: block; padding: 0; max-width: none; }
  .main { padding: 0; }
  .article-wrap { max-width: none; margin: 0; }
  .article { border: none; box-shadow: none; border-radius: 0; padding: 0; }
  .article h1 { font-size: 26pt; }
  .article h2 { break-after: avoid; page-break-after: avoid; }
  .article table, .article blockquote, .article pre { break-inside: avoid; page-break-inside: avoid; }
  a { color: #000; text-decoration: none; }
}