:root {
  --accent: #0d6173;
  --ink: #16202a;
  --muted: #5b6670;
  --paper: #f7f8f7;
  --card: #ffffff;
  --line: #e2e5e3;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #4da3b3;
    --ink: #eef1f2;
    --muted: #a3adb4;
    --paper: #101416;
    --card: #181e21;
    --line: #273035;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }

.wrap { max-width: 860px; margin: 0 auto; padding: 0 24px; }

nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 20px;
  padding-bottom: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 650;
  text-decoration: none;
}

.brand img { width: 32px; height: 32px; border-radius: 8px; }

.links { display: flex; gap: 20px; font-size: 15px; }
.links a { color: var(--muted); text-decoration: none; }
.links a:hover { color: var(--ink); }

.hero { padding: 56px 0 40px; }
.hero h1 { margin: 0 0 16px; font-size: clamp(36px, 6vw, 56px); line-height: 1.1; letter-spacing: -0.02em; }
.hero p { margin: 0 0 28px; max-width: 34em; color: var(--muted); font-size: 20px; }
.note { display: block; margin-top: 12px; color: var(--muted); font-size: 15px; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  padding: 24px 0 56px;
}

.feature {
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.feature h2 { margin: 0 0 6px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); font-size: 16px; }

.doc { padding-bottom: 56px; }
.doc h1 { font-size: 36px; line-height: 1.2; letter-spacing: -0.01em; }
.doc h2 { margin-top: 40px; font-size: 22px; }
.doc li { margin: 4px 0; }

footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; padding-top: 24px; padding-bottom: 32px; }