:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #16202c;
  --muted: #5a6878;
  --accent: #2f6fde;
  --border: #dde3ea;
  --warn-bg: #fff6e0;
  --warn-border: #f0c96a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141b;
    --surface: #161d27;
    --text: #e6ebf1;
    --muted: #9aa7b6;
    --accent: #7fa8ff;
    --border: #273241;
    --warn-bg: #2b2414;
    --warn-border: #6b5622;
  }
}

* {
  box-sizing: border-box;
}

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

header,
footer {
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 16px;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  color: var(--text);
  font-weight: 800;
  font-size: 1.25rem;
  text-decoration: none;
}

nav a {
  color: var(--muted);
  margin-left: 14px;
  text-decoration: none;
  font-size: 0.95rem;
}

nav a:hover,
footer a:hover {
  color: var(--accent);
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 8px 16px 32px;
}

article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
}

h1 {
  margin-top: 0;
  line-height: 1.25;
}

h2 {
  margin-top: 2rem;
  font-size: 1.2rem;
}

h3 {
  font-size: 1.02rem;
}

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

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.note {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: 10px;
  padding: 12px 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93rem;
  display: block;
  overflow-x: auto;
}

th,
td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--bg);
}

footer {
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

footer a {
  color: var(--muted);
  margin: 0 8px;
}

.hero {
  text-align: center;
  padding: 40px 0 24px;
}

.hero p {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 8px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
}

.card h2 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}