/* DSH-flavoured dark surface: semantic tokens named after the harness theme
   (--dsw-alias-*), values approximated from the desktop dark palette. */
:root {
  --bg-base: #0b0e14;
  --bg-layer-1: #121722;
  --bg-layer-2: #171d2b;
  --border-l1: #232b3d;
  --border-l2: #2e3850;
  --label-primary: #e8ecf6;
  --label-secondary: #93a0b8;
  --brand: #4d6bfe;
  --brand-soft: #7c93ff;
  --radius-lg: 14px;
  --radius-md: 10px;
  --font: "Montserrat", "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-weight: 400;
  color: var(--label-primary);
  background:
    radial-gradient(900px 420px at 15% -10%, #1b2748 0%, transparent 60%),
    radial-gradient(700px 380px at 85% 0%, #16233a 0%, transparent 55%),
    var(--bg-base);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
  line-height: 1.6;
}
main { width: 100%; max-width: 620px; }
header { margin-bottom: 22px; }
h1 {
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}
h1::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(77, 107, 254, 0.18);
}
.sub { margin: 0; color: var(--label-secondary); font-size: 13px; }
section {
  background: linear-gradient(180deg, var(--bg-layer-2), var(--bg-layer-1));
  border: 1px solid var(--border-l1);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  margin-bottom: 16px;
}
h2 { margin: 0 0 6px; font-size: 14px; font-weight: 500; }
.hint { margin: 0 0 10px; color: var(--label-secondary); font-size: 12px; }
pre {
  margin: 0;
  background: var(--bg-base);
  border: 1px solid var(--border-l2);
  border-radius: var(--radius-md);
  padding: 11px 13px;
  overflow-x: auto;
}
code {
  font-family: ui-monospace, "Cascadia Code", "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  color: var(--brand-soft);
}
nav { display: flex; flex-wrap: wrap; gap: 8px; }
nav a {
  flex: 1 1 auto;
  text-align: center;
  text-decoration: none;
  font-size: 12.5px;
  color: var(--label-primary);
  background: var(--bg-layer-1);
  border: 1px solid var(--border-l1);
  border-radius: 999px;
  padding: 8px 14px;
  transition: border-color 0.15s ease, background 0.15s ease;
}
nav a:hover { border-color: var(--brand); background: var(--bg-layer-2); }
@media (max-width: 420px) {
  h1 { font-size: 22px; }
  section { padding: 15px 16px; }
}