:root {
  --bg: #f6f6f8;
  --surface: #ffffff;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --accent: #0a6cff;
  --border: #e3e3e8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --text: #f2f2f7;
    --muted: #a1a1a8;
    --accent: #4c9dff;
    --border: #2c2c2e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 24px;
}

h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.25rem; margin: 32px 0 8px; }
h3 { font-size: 1.05rem; margin: 20px 0 6px; }
.card > h2:first-child { margin-top: 0; }

p, li { overflow-wrap: anywhere; }
ul { padding-left: 1.25rem; }
a { color: var(--accent); }
.muted { color: var(--muted); }

nav.lang {
  display: flex;
  gap: 8px;
  margin: 16px 0 24px;
}
nav.lang a {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  text-decoration: none;
  background: var(--surface);
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}