:root {
  --bg: #eef5fd;
  --surface: #ffffff;
  --surface-2: #f5f9ff;
  --line: #dce8f7;
  --text: #0f2a4a;
  --text-2: #4e5f78;
  --primary: #1565d8;
  --danger: #dc3a3f;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a1526;
    --surface: #12223a;
    --surface-2: #172a46;
    --line: #22385a;
    --text: #e8f0fb;
    --text-2: #b4c2d8;
    --primary: #6aa8ff;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}
header {
  color: #fff;
  background: linear-gradient(160deg, #2a84f5, #0b53c6);
  border-radius: 0 0 50% 50% / 0 0 36px 36px;
  padding: 20px 16px 72px;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 800; font-size: 1.1rem; }
.brand img { width: 32px; height: 35px; }
header h1 { margin: 28px 0 6px; font-size: clamp(1.7rem, 4vw, 2.3rem); letter-spacing: -0.02em; line-height: 1.2; }
header p { margin: 0; opacity: 0.9; }
main { margin-top: -44px; }
.card { background: var(--surface); border-radius: 20px; box-shadow: 0 4px 14px rgba(16, 64, 140, 0.09); padding: 28px; }
@media (max-width: 560px) { .card { padding: 20px; } }
h2 { font-size: 1.25rem; margin: 32px 0 8px; letter-spacing: -0.01em; scroll-margin-top: 16px; }
h2:first-child { margin-top: 0; }
h3 { font-size: 1.02rem; margin: 20px 0 6px; }
p, li { color: var(--text-2); }
strong { color: var(--text); }
a { color: var(--primary); text-underline-offset: 3px; overflow-wrap: anywhere; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
.summary { background: var(--surface-2); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; margin: 0 0 8px; }
.summary ul { margin: 6px 0 0; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 0.93rem; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { color: var(--text); background: var(--surface-2); }
td { color: var(--text-2); }
.table-wrap { overflow-x: auto; }
.toc { columns: 2; column-gap: 24px; margin: 0; }
@media (max-width: 560px) { .toc { columns: 1; } }
.muted { font-size: 0.88rem; }
.btn { display: inline-flex; align-items: center; gap: 8px; min-height: 46px; padding: 10px 20px; border-radius: 14px; font-weight: 700; color: #fff; background: linear-gradient(160deg, #2a84f5, #0b53c6); text-decoration: none; }
footer { text-align: center; padding: 28px 16px 48px; font-size: 0.88rem; color: var(--text-2); }
footer a { margin: 0 8px; }
@media print { header { border-radius: 0; } .card { box-shadow: none; } }