:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #1a1d2e;
  --muted: #5c6178;
  --faint: #8b90a5;
  --border: #e4e7f0;
  --accent: #4f6ef7;
  --accent2: #a855f7;
  --chip: #eef1fd;
  --warn-bg: #fff6e5;
  --warn-border: #f5c96b;
  --warn-text: #6b4a05;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1018;
    --surface: #171a26;
    --text: #eceef6;
    --muted: #a2a8c0;
    --faint: #757b93;
    --border: #262b3d;
    --chip: #1e2333;
    --warn-bg: #2a2210;
    --warn-border: #6b5417;
    --warn-text: #f0d9a0;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

.banner {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  padding: 34px 24px 30px;
}

.banner-inner { max-width: 760px; margin: 0 auto; }

.eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  opacity: .82;
  margin-bottom: 8px;
}

.banner h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -.02em;
}

.banner .sub { margin-top: 8px; font-size: 14.5px; opacity: .9; }

main {
  max-width: 760px;
  margin: -18px auto 0;
  padding: 0 24px 64px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 30px 30px 34px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 26px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.chip {
  background: var(--chip);
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 12.5px;
  font-weight: 600;
}

h2 {
  font-size: 19px;
  font-weight: 750;
  letter-spacing: -.01em;
  margin: 34px 0 10px;
  scroll-margin-top: 16px;
}

h2:first-of-type { margin-top: 0; }

h3 {
  font-size: 15px;
  font-weight: 700;
  margin: 22px 0 6px;
  color: var(--text);
}

p { margin: 0 0 14px; color: var(--muted); }

li { color: var(--muted); margin-bottom: 7px; }

ul { padding-left: 22px; margin: 0 0 16px; }

strong { color: var(--text); font-weight: 650; }

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

code {
  background: var(--chip);
  border-radius: 5px;
  padding: 2px 6px;
  font-size: 13.5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--text);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 6px 0 20px;
  font-size: 14.5px;
  display: block;
  overflow-x: auto;
}

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

th {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--faint);
  font-weight: 700;
}

td { color: var(--muted); }

.todo {
  background: var(--warn-bg);
  border: 1px dashed var(--warn-border);
  color: var(--warn-text);
  border-radius: 6px;
  padding: 1px 8px;
  font-weight: 700;
  font-size: 14px;
}

.toc {
  background: var(--chip);
  border-radius: 12px;
  padding: 18px 22px;
  margin-bottom: 30px;
}

.toc-title {
  font-size: 11.5px;
  font-weight: 750;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 10px;
}

.toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 28px; }
.toc li { margin-bottom: 4px; font-size: 14px; }

footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 60px;
  color: var(--faint);
  font-size: 13.5px;
}

footer .links { margin-bottom: 10px; display: flex; gap: 18px; flex-wrap: wrap; }

.home-grid { display: grid; gap: 16px; grid-template-columns: 1fr 1fr; margin-top: 4px; }

.home-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px 22px;
  color: var(--text);
  transition: border-color .15s ease, transform .15s ease;
}

.home-card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.home-card .ico { font-size: 26px; }
.home-card h3 { margin: 12px 0 4px; font-size: 17px; }
.home-card p { margin: 0; font-size: 14px; }

@media (max-width: 600px) {
  .banner h1 { font-size: 24px; }
  .card { padding: 24px 20px 28px; border-radius: 14px; }
  main { padding: 0 14px 48px; }
  .banner { padding: 28px 18px 26px; }
  .toc ol { columns: 1; }
  .home-grid { grid-template-columns: 1fr; }
  footer { padding: 0 14px 44px; }
}

@media print {
  body { background: #fff; }
  .banner { background: none; color: #000; border-bottom: 2px solid #000; }
  .card { border: none; padding: 0; }
  .toc { display: none; }
}