:root {
  --accent: #1f4fb8;
  --accent-2: #0b6e59;
  --ink: #1a1a1a;
  --muted: #5f5f66;
  --bg: #f6f7fb;
  --card: #ffffff;
  --border: rgba(0, 0, 0, 0.08);
  --radius: 16px;
  --maxw: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f2f7;
    --muted: #a0a0a8;
    --bg: #000000;
    --card: #121214;
    --border: rgba(255, 255, 255, 0.1);
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(31, 79, 184, 0.14), transparent 55%),
    var(--bg);
  line-height: 1.6;
  min-height: 100vh;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 24px 20px 64px;
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 20px;
  text-decoration: none;
  color: var(--ink);
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  object-fit: cover;
  display: block;
}

.lang {
  display: inline-flex;
  gap: 4px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px;
}

.lang button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
}

.lang button[aria-pressed="true"] {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
}

.hero h1 {
  font-size: clamp(28px, 6vw, 44px);
  line-height: 1.1;
  margin: 8px 0 12px;
}

.hero p.tagline {
  font-size: clamp(17px, 3.5vw, 20px);
  color: var(--muted);
  margin: 0 0 24px;
}

.features {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 28px 0;
}

@media (min-width: 560px) {
  .features { grid-template-columns: 1fr 1fr; }
}

.feature {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.feature h3 { margin: 0 0 4px; font-size: 16px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 12px;
  border: 1px solid var(--border);
  color: var(--ink);
  background: var(--card);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  border-color: transparent;
}

main.doc h1 { font-size: clamp(26px, 5vw, 36px); margin: 4px 0 4px; }
main.doc .updated { color: var(--muted); font-size: 14px; margin: 0 0 28px; }
main.doc h2 { font-size: 20px; margin: 32px 0 8px; }
main.doc p, main.doc li { color: var(--ink); }
main.doc a { color: var(--accent); }
main.doc ul { padding-left: 20px; }

footer.site {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  align-items: center;
  justify-content: space-between;
}

footer.site a { color: var(--accent); text-decoration: none; }

[hidden] { display: none !important; }