:root {
  color-scheme: light;
  --bg: #f5f5f7;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-solid: #ffffff;
  --ink: #171717;
  --muted: #6e6e73;
  --line: rgba(17, 17, 17, 0.09);
  --accent: #0b6e69;
  --accent-soft: #e6f3f1;
  --max: 920px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.site-header {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  padding: 24px 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: .02em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  background: var(--accent);
  color: white;
  font-size: 15px;
  font-weight: 800;
}

.brand small {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.2;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px 16px;
  font-size: 13px;
}

.site-nav a { color: var(--muted); }
.site-nav a[aria-current="page"] { color: var(--ink); font-weight: 700; }

.main {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  padding: 54px 0 86px;
}

.hero,
.document,
.support-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: 0 18px 50px rgba(20, 25, 25, 0.06);
  backdrop-filter: blur(18px);
}

.hero {
  padding: clamp(28px, 6vw, 64px);
  margin-bottom: 22px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .15em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.2; letter-spacing: -.025em; }
h1 { margin: 0; max-width: 720px; font-size: clamp(36px, 7vw, 64px); }
h2 { margin: 0 0 14px; font-size: clamp(24px, 4vw, 34px); }
h3 { margin: 28px 0 8px; font-size: 19px; }

.lead {
  max-width: 650px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2.4vw, 20px);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.button:hover { color: #fff; text-decoration: none; filter: brightness(.95); }
.button.secondary { background: var(--accent-soft); color: var(--accent); }

.document { padding: clamp(24px, 5vw, 48px); }
.document > :first-child { margin-top: 0; }
.document p, .document li { color: #414145; }
.document ul { padding-left: 1.3em; }
.document strong { color: var(--ink); }
.meta { color: var(--muted); font-size: 13px; }

.notice {
  margin: 22px 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  border-radius: 12px;
  background: var(--accent-soft);
  color: #285b58;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.support-card { padding: 22px; }
.support-card h3 { margin-top: 0; }
.support-card p { margin-bottom: 0; color: var(--muted); }

.site-footer {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  padding: 0 0 30px;
  color: var(--muted);
  font-size: 12px;
}

.footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 8px; }

@media (max-width: 640px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  .site-nav { justify-content: flex-start; }
  .main { padding-top: 28px; }
  .hero, .document, .support-card { border-radius: 22px; }
  .support-grid { grid-template-columns: 1fr; }
}