:root {
    --bg: #0c1018;
    --bg2: #131924;
    --bg3: #1a2233;
    --bg4: #212d42;
    --border: rgba(255,255,255,0.07);
    --border2: rgba(255,255,255,0.13);
    --text: #dde3ee;
    --muted: #7a8499;
    --accent: #7c5ce4;
    --accent-lt: #a78bf0;
    --green: #3dc98d;
    --red: #e05c6b;
    --amber: #f0a832;
    --blue: #4ca3e8;
    --teal: #2dd4bf;
    --pink: #e879a2;
    --mono: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', monospace;
    --sans: 'Inter', system-ui, sans-serif;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 14px;
    line-height: 1.7;
    display: flex;
    min-height: 100vh;
  }

  /* ── SIDEBAR ── */
  .sidebar {
    width: 256px;
    min-width: 256px;
    background: var(--bg2);
    border-right: 1px solid var(--border);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    padding: 0 0 48px;
    flex-shrink: 0;
  }
  .sidebar::-webkit-scrollbar { width: 3px; }
  .sidebar::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

  .sb-logo {
    padding: 22px 20px 18px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 12px;
    background: linear-gradient(135deg, rgba(124,92,228,0.12), rgba(61,201,141,0.06));
  }
  .sb-logo-title { font-size: 13px; font-weight: 700; color: var(--accent-lt); letter-spacing: 0.06em; }
  .sb-logo-sub { font-size: 11px; color: var(--muted); margin-top: 2px; }

  .nav-section { margin-bottom: 2px; }
  .nav-group {
    font-size: 10px; font-weight: 700; color: var(--muted);
    text-transform: uppercase; letter-spacing: 0.12em;
    padding: 12px 20px 4px;
  }
  .nav-link {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 20px;
    color: var(--muted);
    text-decoration: none;
    font-size: 12.5px;
    transition: color 0.15s, background 0.15s;
    border-left: 2px solid transparent;
  }
  .nav-link:hover { color: var(--text); background: var(--bg3); }
  .nav-link.active { color: var(--accent-lt); border-left-color: var(--accent); background: rgba(124,92,228,0.07); }
  .nav-dot {
    width: 5px; height: 5px; border-radius: 50%;
    background: currentColor; flex-shrink: 0; opacity: 0.5;
  }

  /* ── MAIN ── */
  .main { flex: 1; max-width: 960px; padding: 40px 52px 100px; overflow-x: hidden; }

  /* ── HERO ── */
  .hero {
    border-radius: 12px;
    padding: 28px 32px;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
    background: linear-gradient(130deg, rgba(124,92,228,0.1) 0%, rgba(61,201,141,0.05) 60%, rgba(76,163,232,0.06) 100%);
    border: 1px solid rgba(124,92,228,0.25);
  }
  .hero::after {
    content: '.NET';
    position: absolute; right: 28px; top: 50%; transform: translateY(-50%);
    font-size: 96px; font-weight: 900; color: rgba(124,92,228,0.07);
    letter-spacing: -4px; pointer-events: none; user-select: none;
    font-family: var(--sans);
  }
  .hero h1 { font-size: 24px; font-weight: 700; margin-bottom: 6px; color: var(--text); }
  .hero-desc { font-size: 14px; color: var(--muted); max-width: 560px; margin-bottom: 16px; }
  .badge-row { display: flex; flex-wrap: wrap; gap: 8px; }
  .badge {
    font-size: 11px; font-weight: 600; padding: 3px 11px;
    border-radius: 20px; white-space: nowrap; letter-spacing: 0.02em;
  }
  .b-purple { background: rgba(124,92,228,0.18); color: #b49cf5; border: 1px solid rgba(124,92,228,0.3); }
  .b-green  { background: rgba(61,201,141,0.13); color: #4fd49a; border: 1px solid rgba(61,201,141,0.25); }
  .b-blue   { background: rgba(76,163,232,0.13); color: #7abbf0; border: 1px solid rgba(76,163,232,0.25); }
  .b-amber  { background: rgba(240,168,50,0.13); color: #f5be60; border: 1px solid rgba(240,168,50,0.25); }

  /* ── TYPOGRAPHY ── */
  h2 {
    font-size: 19px; font-weight: 700; color: var(--text);
    margin: 40px 0 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border);
    display: flex; align-items: center; gap: 10px;
  }
  h2 .h2-icon { font-size: 18px; opacity: 0.85; }
  h3 { font-size: 14.5px; font-weight: 600; color: var(--text); margin: 26px 0 10px; }
  h4 { font-size: 11px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 0.1em; margin: 20px 0 8px; }
  p { color: var(--muted); margin-bottom: 10px; line-height: 1.75; font-size: 13.5px; }
  p strong { color: var(--text); font-weight: 600; }
  a { color: var(--accent-lt); text-decoration: none; }
  a:hover { text-decoration: underline; }
  ul, ol { margin: 8px 0 12px 20px; }
  li { color: var(--muted); font-size: 13.5px; margin-bottom: 4px; line-height: 1.65; }
  li strong { color: var(--text); font-weight: 600; }
  section { margin-bottom: 56px; scroll-margin-top: 24px; }

  /* ── CODE ── */
  pre {
    background: #090e18;
    border: 1px solid var(--border);
    border-radius: 9px;
    padding: 18px 22px;
    overflow-x: auto;
    margin: 12px 0;
    font-family: var(--mono);
    font-size: 12.5px;
    line-height: 1.7;
    position: relative;
  }
  pre::before {
    content: attr(data-label);
    position: absolute; top: 10px; right: 14px;
    font-size: 10px; font-family: var(--sans);
    color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase;
  }
  pre::-webkit-scrollbar { height: 3px; }
  pre::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }
  code {
    font-family: var(--mono); font-size: 12px;
    background: rgba(124,92,228,0.12);
    padding: 1px 6px; border-radius: 4px; color: var(--accent-lt);
  }
  pre code { background: none; padding: 0; border-radius: 0; font-size: 12.5px; }

  /* Syntax tokens */
  .kw  { color: #c792ea; }
  .str { color: #c3e88d; }
  .cm  { color: #4a5568; font-style: italic; }
  .fn  { color: #82aaff; }
  .tp  { color: #ffcb6b; }
  .nu  { color: #f78c6c; }
  .at  { color: var(--teal); }
  .op  { color: #89ddff; }
  .nb  { color: var(--teal); }
  .hl  { background: rgba(124,92,228,0.1); display: block; margin: 0 -22px; padding: 0 22px; border-left: 2px solid var(--accent); }

  /* ── DO / DON'T ── */
  .diff-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 12px 0; }
  @media (max-width: 720px) { .diff-grid { grid-template-columns: 1fr; } }
  .diff-block { border-radius: 8px; overflow: hidden; }
  .diff-header {
    font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
    padding: 6px 14px; display: flex; align-items: center; gap: 6px;
  }
  .diff-do .diff-header   { background: rgba(61,201,141,0.15); color: #3dc98d; border: 1px solid rgba(61,201,141,0.25); border-bottom: none; }
  .diff-dont .diff-header { background: rgba(224,92,107,0.12); color: #e05c6b; border: 1px solid rgba(224,92,107,0.2); border-bottom: none; }
  .diff-do pre   { border-top-left-radius: 0; border-top-right-radius: 0; border-color: rgba(61,201,141,0.2); margin: 0; }
  .diff-dont pre { border-top-left-radius: 0; border-top-right-radius: 0; border-color: rgba(224,92,107,0.15); margin: 0; }

  /* ── TABLES ── */
  .tw { overflow-x: auto; margin: 12px 0; border-radius: 9px; border: 1px solid var(--border); }
  table { width: 100%; border-collapse: collapse; font-size: 13px; }
  th {
    text-align: left; padding: 9px 14px;
    background: var(--bg3);
    color: var(--text); font-weight: 600; font-size: 11.5px;
    text-transform: uppercase; letter-spacing: 0.07em;
    border-bottom: 1px solid var(--border2);
  }
  td { padding: 9px 14px; border-bottom: 1px solid var(--border); color: var(--muted); vertical-align: top; }
  tr:last-child td { border-bottom: none; }
  tr:hover td { background: rgba(255,255,255,0.017); }
  .ok  { color: var(--green); font-weight: 600; }
  .no  { color: var(--red); font-weight: 600; }
  .na  { color: var(--muted); }

  /* ── CALLOUT ── */
  .callout {
    display: flex; gap: 12px; border-radius: 8px;
    padding: 13px 16px; margin: 14px 0; font-size: 13.5px; line-height: 1.65;
  }
  .callout-icon { flex-shrink: 0; font-size: 15px; margin-top: 1px; }
  .callout-body { color: var(--muted); }
  .callout-body strong { color: var(--text); }
  .tip    { background: rgba(61,201,141,0.07); border: 1px solid rgba(61,201,141,0.2); }
  .warn   { background: rgba(240,168,50,0.07);  border: 1px solid rgba(240,168,50,0.22); }
  .info   { background: rgba(76,163,232,0.07);  border: 1px solid rgba(76,163,232,0.2); }
  .danger { background: rgba(224,92,107,0.07);  border: 1px solid rgba(224,92,107,0.2); }

  /* ── RULE CARDS ── */
  .rule-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; margin: 14px 0; }
  .rule-card {
    background: var(--bg2); border: 1px solid var(--border);
    border-radius: 9px; padding: 16px 18px;
    transition: border-color 0.18s;
    position: relative;
  }
  .rule-card:hover { border-color: var(--border2); }
  .rule-num {
    font-size: 10px; font-weight: 700; color: var(--accent-lt);
    background: rgba(124,92,228,0.14); padding: 1px 7px;
    border-radius: 10px; margin-bottom: 8px; display: inline-block;
    letter-spacing: 0.05em;
  }
  .rule-title { font-size: 13.5px; font-weight: 600; color: var(--text); margin-bottom: 5px; }
  .rule-body  { font-size: 12.5px; color: var(--muted); line-height: 1.6; }

  /* ── NAMING TABLE ── */
  .nt-token { font-family: var(--mono); font-size: 12px; color: var(--teal); }
  .nt-example { font-family: var(--mono); font-size: 12px; color: var(--amber); }

  /* ── SEVERITY BADGE ── */
  .sev {
    font-size: 10px; font-weight: 700; padding: 2px 8px;
    border-radius: 10px; letter-spacing: 0.04em; white-space: nowrap;
  }
  .sev-must   { background: rgba(224,92,107,0.18); color: #e87d89; border: 1px solid rgba(224,92,107,0.3); }
  .sev-should { background: rgba(240,168,50,0.15);  color: #f5be5a; border: 1px solid rgba(240,168,50,0.3); }
  .sev-avoid  { background: rgba(61,201,141,0.12);  color: #4fd49a; border: 1px solid rgba(61,201,141,0.25); }

  /* ── TOOL ROW ── */
  .tool-row {
    display: flex; align-items: flex-start; gap: 14px;
    padding: 12px 16px; background: var(--bg2);
    border: 1px solid var(--border); border-radius: 8px; margin-bottom: 8px;
    transition: border-color 0.15s;
  }
  .tool-row:hover { border-color: var(--border2); }
  .tool-icon { font-size: 22px; flex-shrink: 0; margin-top: 2px; }
  .tool-name { font-size: 13.5px; font-weight: 600; color: var(--text); }
  .tool-desc { font-size: 12.5px; color: var(--muted); margin-top: 2px; line-height: 1.5; }
  .tool-pkg  { font-family: var(--mono); font-size: 11px; color: var(--accent-lt); margin-top: 4px; }

  /* ── QUICK REFERENCE ── */
  .qr-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 10px; margin: 12px 0; }
  .qr-card {
    background: var(--bg2); border: 1px solid var(--border);
    border-radius: 8px; padding: 14px 16px;
  }
  .qr-title { font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 8px; }

  /* ── SCROLLBAR ── */
  ::-webkit-scrollbar { width: 5px; height: 5px; }
  ::-webkit-scrollbar-track { background: transparent; }
  ::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.09); border-radius: 3px; }

  @media (max-width: 768px) { .sidebar { display: none; } .main { padding: 24px 18px 60px; } }