:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --accent: #7c3aed;
  --ink: #111827;
  --muted: #64748b;
  --line: #e5e7eb;
  --surface: #f7f8fc;
  --card: #ffffff;
  --link: #4f46e5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e5e7eb;
    --muted: #94a3b8;
    --line: #283041;
    --surface: #0f131c;
    --card: #161b26;
    --link: #a5b4fc;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font: 16px/1.65 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

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

.top {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--accent));
  color: #fff;
}

.top .bar {
  max-width: 820px;
  margin: 0 auto;
  padding: 14px 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 20px;
  margin-right: auto;
}

.mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: #fff;
  color: var(--primary);
  display: grid;
  place-items: center;
  font: 600 22px/1 Georgia, "Times New Roman", serif;
}

.top nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
.top nav a { color: #fff; opacity: .9; text-decoration: none; font-size: 15px; }
.top nav a:hover, .top nav a[aria-current] { opacity: 1; text-decoration: underline; }

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 28px 16px 48px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px 20px;
}

@media (min-width: 640px) {
  .card { padding: 36px 40px; }
}

h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 22px 0 6px; }
p, li { overflow-wrap: anywhere; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }

.meta { color: var(--muted); font-size: 14px; margin: 0 0 20px; }

.note {
  border-left: 4px solid var(--primary);
  background: color-mix(in srgb, var(--primary) 8%, transparent);
  padding: 12px 16px;
  border-radius: 8px;
  margin: 16px 0;
}

.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { font-weight: 600; }

.hero { text-align: center; padding: 24px 0 8px; }
.hero h1 { font-size: 34px; }
.hero p { color: var(--muted); max-width: 560px; margin: 8px auto 0; }

.links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.links a {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px 18px;
  text-decoration: none;
  color: var(--ink);
}

.links a strong { display: block; color: var(--link); margin-bottom: 2px; }
.links a span { color: var(--muted); font-size: 14px; }

footer {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 16px 32px;
  color: var(--muted);
  font-size: 14px;
}

footer a { color: var(--muted); }