:root {
  --bg: #ffffff;
  --surface: #f5f7fa;
  --text: #1f2328;
  --muted: #59636e;
  --border: #d8dee4;
  --accent: #4a7ab5;
  --accent-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --surface: #181c22;
    --text: #e6e9ed;
    --muted: #9aa4af;
    --border: #2d333b;
    --accent: #7aa5d9;
    --accent-text: #0f1216;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  padding-bottom: 16px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--text); }
nav .brand { color: var(--text); font-weight: 700; margin-right: auto; }

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.35rem; margin: 40px 0 8px; }
h3 { font-size: 1.05rem; margin: 24px 0 4px; }

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

.lead { font-size: 1.15rem; color: var(--muted); margin: 0 0 24px; }
.meta { color: var(--muted); font-size: 0.9rem; }

.lang-switch { font-size: 0.9rem; margin-bottom: 24px; }

.button {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-text);
  text-decoration: none;
  font-weight: 600;
}

.button[aria-disabled="true"] { opacity: 0.55; pointer-events: none; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}

.feature h3 { margin-top: 0; }
.feature p { margin: 0; color: var(--muted); font-size: 0.95rem; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 56px 0 8px;
}

footer {
  margin-top: 56px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}