:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --text: #11131a;
  --text-secondary: #54596b;
  --text-tertiary: #8a8f9e;
  --accent: #2880ff;
  --stroke: rgba(0, 0, 0, 0.08);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 22px 80px;
}

.hero { text-align: center; margin-bottom: 36px; }
.hero h1 {
  font-size: 40px;
  font-weight: 800;
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}
.tagline { color: var(--text-secondary); margin: 0; font-size: 17px; }

.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 560px) { .cards { grid-template-columns: 1fr; } }

.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 22px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(0, 0, 0, 0.08); }
.card h2 { margin: 0 0 6px; font-size: 19px; }
.card p { margin: 0; color: var(--text-secondary); font-size: 14px; }

.doc {
  background: var(--surface);
  border: 1px solid var(--stroke);
  border-radius: 18px;
  padding: 32px 30px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);
}
.doc h1 { font-size: 28px; margin: 0 0 4px; letter-spacing: -0.01em; }
.doc .updated { color: var(--text-tertiary); font-size: 14px; margin: 0 0 24px; }
.doc h2 {
  font-size: 18px;
  margin: 28px 0 8px;
  padding-top: 8px;
}
.doc p, .doc li { color: var(--text-secondary); font-size: 15.5px; }
.doc a { color: var(--accent); }
.doc ul { padding-left: 20px; }

.back {
  display: inline-block;
  margin-bottom: 22px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
}

.foot { text-align: center; margin-top: 40px; color: var(--text-tertiary); font-size: 14px; }
.foot a { color: var(--accent); }