:root {
  --bg: #0e1420;
  --panel: #151d2e;
  --panel2: #1b2740;
  --text: #e8edf5;
  --muted: #8b98ad;
  --accent: #66c0f4;
  --up: #7ed957;
  --hot: #ffb347;
  --border: #26334d;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  min-height: 100vh;
}
.dsf-header {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 14px 22px; background: var(--panel); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
}
.dsf-brand { font-size: 19px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.dsf-logo { font-size: 21px; }
.dsf-ver {
  font-size: 11px; font-weight: 600; color: var(--bg);
  background: var(--accent); border-radius: 20px; padding: 2px 9px;
}
.dsf-nav { display: flex; gap: 8px; flex-wrap: wrap; }
.dsf-nav a {
  color: var(--text); text-decoration: none; font-size: 13px; font-weight: 600;
  border: 1px solid var(--border); border-radius: 20px; padding: 5px 13px;
  background: var(--panel2); transition: border-color .15s;
}
.dsf-nav a:hover { border-color: var(--accent); }
.dsf-main {
  max-width: 960px; margin: 0 auto; padding: 26px 22px 60px; line-height: 1.75;
}
.dsf-crumb {
  font-size: 12px; color: var(--muted); font-family: ui-monospace, Consolas, monospace;
  margin-bottom: 18px; border-bottom: 1px dashed var(--border); padding-bottom: 8px;
}
.dsf-toc {
  background: var(--panel2); border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 16px; margin: 0 0 22px; font-size: 14px;
}
.dsf-toc summary { cursor: pointer; font-weight: 700; color: var(--accent); }
.dsf-toc ul { list-style: none; margin: 8px 0 0; padding-left: 6px; }
.dsf-toc li { margin: 2px 0; }
.dsf-toc a { color: var(--muted); text-decoration: none; }
.dsf-toc a:hover { color: var(--accent); }
.dsf-main h1 {
  font-size: 27px; margin: 8px 0 18px; color: var(--accent);
  border-bottom: 2px solid var(--border); padding-bottom: 10px;
}
.dsf-main h2 { font-size: 21px; margin: 30px 0 12px; color: var(--hot); }
.dsf-main h3 { font-size: 17px; margin: 22px 0 8px; color: var(--text); }
.dsf-main h4 { font-size: 15px; margin: 16px 0 6px; }
.dsf-main p { margin: 8px 0; }
.dsf-main ul, .dsf-main ol { margin: 8px 0 8px 22px; }
.dsf-main li { margin: 3px 0; }
.dsf-main strong { color: #fff; }
.dsf-main a { color: var(--accent); }
.dsf-main blockquote {
  border-left: 3px solid var(--accent); background: var(--panel2);
  padding: 8px 14px; border-radius: 0 8px 8px 0; margin: 10px 0; color: var(--muted);
}
.dsf-main code {
  background: var(--panel2); border: 1px solid var(--border); border-radius: 4px;
  padding: 1px 6px; font-size: 13px; font-family: ui-monospace, Consolas, monospace;
}
.dsf-main pre {
  background: #0a0f1a; border: 1px solid var(--border); border-radius: 10px;
  padding: 14px 16px; overflow-x: auto; margin: 12px 0;
}
.dsf-main pre code { background: none; border: none; padding: 0; font-size: 13px; line-height: 1.6; }
.dsf-main table {
  border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 13.5px;
  background: var(--panel); border-radius: 8px; overflow: hidden;
}
.dsf-main th, .dsf-main td {
  border: 1px solid var(--border); padding: 7px 10px; text-align: left; vertical-align: top;
}
.dsf-main th { background: var(--panel2); color: var(--accent); font-weight: 700; white-space: nowrap; }
.dsf-main tr:nth-child(even) td { background: rgba(255,255,255,.02); }
.dsf-main hr { border: none; border-top: 1px solid var(--border); margin: 22px 0; }
.dsf-footer {
  margin-top: 40px; padding-top: 14px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 12.5px;
}

/* v0.13 refinement: consistent depth and calmer typography */
:root {
  --bg: #0b111c;
  --panel: #111a29;
  --panel2: #182538;
  --text: #e8edf5;
  --muted: #8b98ad;
  --accent: #66c0f4;
  --up: #7ed957;
  --hot: #ffb347;
  --border: #26354f;
  --panel-glass: rgba(17,26,41,.88);
  --panel-raised: linear-gradient(180deg, rgba(24,37,56,.96), rgba(17,26,41,.98));
  --shadow-soft: 0 12px 35px rgba(5,9,16,.22);
  --gradient-accent: linear-gradient(135deg, #66c0f4, #4dd0e1);
}
body {
  background:
    radial-gradient(circle at 10% 0%, rgba(102,192,244,.10), transparent 34%),
    radial-gradient(circle at 90% 5%, rgba(255,179,71,.05), transparent 28%),
    linear-gradient(180deg, #0b111c, #0a1019 55%, #0b111c);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}
.dsf-header {
  padding: 12px clamp(14px, 3vw, 30px);
  background: var(--panel-glass);
  backdrop-filter: blur(18px) saturate(150%);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  border-bottom: 1px solid rgba(102,192,244,.12);
  box-shadow: 0 10px 35px rgba(4,8,15,.20);
}
.dsf-logo {
  align-items: center;
  background: linear-gradient(145deg, rgba(102,192,244,.20), rgba(102,192,244,.04));
  border: 1px solid rgba(102,192,244,.26);
  border-radius: 12px;
  display: inline-flex;
  height: 34px;
  justify-content: center;
  width: 34px;
  font-size: 18px;
}
.dsf-ver {
  background: rgba(102,192,244,.12);
  border: 1px solid rgba(102,192,244,.24);
  color: var(--accent);
}
.dsf-nav a {
  background: linear-gradient(180deg, rgba(24,37,56,.90), rgba(17,26,41,.92));
  border-color: rgba(102,192,244,.10);
  color: #a7b3c7;
  transition: color .18s ease, border-color .18s ease, transform .18s ease, background .18s ease;
}
.dsf-nav a:hover {
  color: #fff;
  border-color: rgba(102,192,244,.36);
  transform: translateY(-1px);
}
.dsf-main { padding-top: 34px; }
.dsf-crumb {
  border-bottom-color: rgba(102,192,244,.10);
}
.dsf-toc {
  background: rgba(11,17,28,.52);
  border-color: rgba(102,192,244,.10);
  border-radius: 15px;
  box-shadow: var(--shadow-soft);
}
.dsf-main h1 {
  background: linear-gradient(90deg, #fff, #a9d9f9);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  border-bottom: 1px solid rgba(102,192,244,.12);
  letter-spacing: -.04em;
}
.dsf-main h2 {
  letter-spacing: -.025em;
}
.dsf-main blockquote {
  background: rgba(102,192,244,.06);
  border-radius: 12px;
}
.dsf-main table {
  border-radius: 14px;
  border: 1px solid rgba(102,192,244,.09);
  box-shadow: var(--shadow-soft);
}
.dsf-main th,
.dsf-main td { border-color: rgba(102,192,244,.075); }
.dsf-main th {
  background: rgba(13,20,32,.96);
  text-transform: uppercase;
  letter-spacing: .035em;
  font-size: 11.5px;
}
.dsf-main tr:nth-child(even) td { background: rgba(102,192,244,.018); }
.dsf-main pre {
  border-color: rgba(102,192,244,.10);
  border-radius: 13px;
  box-shadow: var(--shadow-soft);
}