:root {
  --bg-base: #0A0B10;
  --bg-surface: #12141C;
  --text-primary: #E8EAF0;
  --text-secondary: #9BA1B0;
  --neon-primary: #4DA6FF;
  --neon-secondary: #B845FF;
  --border-subtle: rgba(255, 255, 255, 0.12);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-base: #F5F6FA;
    --bg-surface: #FFFFFF;
    --text-primary: #12141C;
    --text-secondary: #5B6172;
    --neon-primary: #0091EA;
    --neon-secondary: #8A2BE2;
    --border-subtle: rgba(0, 0, 0, 0.1);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.8;
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--neon-primary), var(--neon-secondary));
  flex-shrink: 0;
}

header.top .brand {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
}

h1 {
  font-size: 26px;
  font-weight: 700;
  margin: 32px 0 4px;
}

.updated {
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 32px;
}

h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 40px 0 12px;
  padding-top: 8px;
  border-top: 1px solid var(--border-subtle);
}

h2:first-of-type { border-top: none; padding-top: 0; }

p, li { color: var(--text-primary); font-size: 15px; }

ul { padding-left: 1.2em; }
li { margin-bottom: 6px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 20px;
  font-size: 14px;
}

th, td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
}

th { color: var(--text-secondary); font-weight: 600; width: 34%; }

a { color: var(--neon-primary); }

.notice {
  background: color-mix(in srgb, var(--neon-primary) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--neon-primary) 30%, transparent);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 13px;
  color: var(--text-secondary);
  margin: 24px 0;
}

footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 12px;
  color: var(--text-secondary);
}

.nav-links {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  font-size: 13px;
}