:root {
  --bg: #f6f7fc;
  --card: #ffffff;
  --text: #1d2130;
  --muted: #5d6376;
  --border: #e3e5ef;
  --accent: #5b6cf0;
  --accent-2: #6d4ae6;
  --accent-text: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151c;
    --card: #1d1f29;
    --text: #e8e9f0;
    --muted: #a0a4b6;
    --border: #2d3040;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--accent); }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 16px; }
header.top { padding: 20px 0; }
header.top .wrap { display: flex; align-items: center; gap: 10px; }
header.top img { width: 32px; height: 32px; }
header.top a.brand { font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; display: flex; align-items: center; gap: 10px; }
.hero { text-align: center; padding: 40px 0 24px; }
.hero img { width: 96px; height: 96px; }
.hero h1 { font-size: clamp(30px, 6vw, 44px); margin: 16px 0 8px; line-height: 1.15; }
.hero p.lead { font-size: 18px; color: var(--muted); max-width: 600px; margin: 0 auto 28px; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 26px; border-radius: 12px; font-weight: 600; font-size: 17px; text-decoration: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: var(--accent-text);
  box-shadow: 0 8px 24px rgba(91, 108, 240, 0.3);
}
.btn:hover { filter: brightness(1.06); }
.sub { margin-top: 12px; font-size: 14px; color: var(--muted); }
.note {
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px 18px; margin: 28px auto 0; max-width: 640px; font-size: 14px; color: var(--muted); text-align: left;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; padding: 32px 0; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 18px 20px; }
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.doc { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 8px 28px 24px; margin: 16px 0 40px; }
.doc h1 { font-size: 30px; line-height: 1.2; }
.doc h2 { font-size: 20px; margin-top: 28px; }
.doc li { margin: 4px 0; }
.muted { color: var(--muted); }
footer { border-top: 1px solid var(--border); padding: 20px 0 32px; font-size: 14px; color: var(--muted); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; }