/* Tianche legal centre — locked to main-site light system (cold white / ice cyan). */
:root {
  color-scheme: light;
  --bg: #f7fbfd;
  --bg-soft: #eef7fb;
  --panel: rgba(255, 255, 255, 0.82);
  --text: #102033;
  --muted: #587086;
  --faint: #74899c;
  --line: rgba(44, 80, 118, 0.14);
  --accent: #1498aa;
  --accent-soft: rgba(20, 152, 170, 0.1);
  --shadow: 0 14px 40px rgba(40, 79, 118, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(70% 42% at 50% 0%, rgba(24, 167, 200, 0.1), transparent 64%),
    linear-gradient(180deg, #ffffff 0%, var(--bg-soft) 42%, var(--bg) 100%);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

.hero {
  max-width: 1280px;
  margin: 0 auto;
  padding: clamp(56px, 8vw, 112px) max(24px, calc((100% - 1280px) / 2 + 24px)) clamp(38px, 5vw, 70px);
  position: relative;
}

.mark {
  font: 600 11px/1.2 ui-monospace, Consolas, monospace;
  letter-spacing: 0.13em;
  color: var(--accent);
}

.lang {
  position: absolute;
  right: max(24px, calc((100% - 1280px) / 2 + 24px));
  top: 38px;
  display: flex;
  gap: 6px;
}

.lang a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 10px;
  color: var(--muted);
  font-size: 12px;
  text-decoration: none;
  background: var(--panel);
}

.lang a:hover,
.lang a:focus-visible {
  color: var(--text);
  border-color: rgba(20, 152, 170, 0.35);
}

.lang a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.hero h1 {
  font-size: clamp(38px, 6vw, 82px);
  line-height: 0.96;
  letter-spacing: -0.05em;
  max-width: 900px;
  margin: 18px 0;
  color: var(--text);
}

.hero > p {
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(16px, 1.6vw, 21px);
  line-height: 1.65;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.meta span {
  font: 11px/1.2 ui-monospace, Consolas, monospace;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 11px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.72);
}

.layout {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 max(24px, calc((100% - 1280px) / 2 + 24px)) 80px;
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  gap: clamp(34px, 6vw, 88px);
}

.sticky {
  position: sticky;
  top: 24px;
  border-top: 1px solid var(--accent);
  padding-top: 18px;
  border-radius: 0;
  background: transparent;
}

.sticky strong {
  font-size: 13px;
  color: var(--text);
}

.sticky nav {
  display: grid;
  gap: 2px;
  margin-top: 14px;
}

.sticky a {
  color: var(--muted);
  text-decoration: none;
  font-size: 12px;
  padding: 7px 0;
  border-radius: 6px;
}

.sticky a:hover,
.sticky a:focus-visible,
.sticky a[aria-current="page"] {
  color: var(--text);
}

.sticky a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sticky a[aria-current="page"]::before {
  content: "— ";
  color: var(--accent);
}

main {
  min-width: 0;
}

main section {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 18px;
  padding: 30px 0;
  border-top: 1px solid var(--line);
}

.num {
  font: 11px/1.5 ui-monospace, Consolas, monospace;
  color: var(--accent);
}

h2 {
  font-size: clamp(18px, 2vw, 24px);
  margin: 0 0 14px;
  letter-spacing: -0.015em;
  color: var(--text);
}

p {
  font-size: 15px;
  line-height: 1.85;
  margin: 0;
  color: #2a3d52;
  max-width: 78ch;
}

.secondary {
  color: var(--faint);
  font-size: 13px;
  margin-top: 12px;
}

.notice {
  border: 1px solid rgba(20, 152, 170, 0.28);
  border-radius: 14px;
  padding: 22px;
  margin-top: 28px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
}

.notice strong {
  color: var(--text);
}

.notice p {
  margin-top: 10px;
  color: var(--muted);
}

@media (max-width: 800px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sticky {
    position: static;
  }

  .sticky nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero {
    padding-top: 72px;
  }
}

@media (max-width: 520px) {
  .sticky nav {
    grid-template-columns: 1fr;
  }

  main section {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 8px;
  }

  .lang {
    top: 20px;
  }

  .hero,
  .layout {
    padding-inline: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    animation: none !important;
    transition: none !important;
  }
}