:root {
  --canvas: #f5f6fa;
  --surface: #ffffff;
  --ink: #1b1f2a;
  --muted: #5d6475;
  --line: #e2e5ee;
  --accent: #4b5bdc;
  --accent-soft: #eceefd;
  --success: #1f8a5b;
  --hero: linear-gradient(135deg, #e9ecff 0%, #f1e9ff 55%, #e7f3ff 100%);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #11131a;
    --surface: #1a1d27;
    --ink: #eef0f6;
    --muted: #a3a9b8;
    --line: #2b2f3c;
    --accent: #8e9bff;
    --accent-soft: #23284a;
    --success: #4cc38a;
    --hero: linear-gradient(135deg, #1d2140 0%, #261d3d 55%, #172437 100%);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 860px; margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 650; font-size: 18px; }
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
nav a { margin-left: 18px; color: var(--muted); font-size: 15px; }
nav a:first-child { margin-left: 0; }
nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }

.hero {
  background: var(--hero);
  border-radius: 24px;
  margin: 32px 0;
  padding: 48px 32px;
  display: flex; gap: 28px; align-items: center; flex-wrap: wrap;
}
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 10px 30px rgba(40, 50, 120, 0.18); }
.hero h1 { margin: 0 0 8px; font-size: 36px; line-height: 1.15; letter-spacing: -0.02em; }
.hero p { margin: 0; color: var(--muted); font-size: 18px; max-width: 560px; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 0 0 32px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

.notice {
  background: var(--accent-soft);
  border-radius: 16px;
  padding: 20px 22px;
  margin: 0 0 32px;
}
.notice strong { color: var(--ink); }

article { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 32px; margin: 32px 0; }
article h1 { margin-top: 0; font-size: 30px; letter-spacing: -0.01em; }
article h2 { font-size: 20px; margin-top: 32px; }
article .meta { color: var(--muted); margin-top: -8px; }
article li { margin: 6px 0; }
table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: var(--canvas); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.92em; background: var(--canvas); padding: 1px 5px; border-radius: 5px; }

footer.site { color: var(--muted); font-size: 14px; padding: 24px 0 48px; }
footer.site a { color: var(--muted); margin-right: 16px; }

@media (max-width: 600px) {
  .hero { padding: 32px 22px; }
  .hero h1 { font-size: 28px; }
  article { padding: 22px; }
}