:root {
    --bg: #0a0a0a;
    --panel: #161616;
    --panel-2: #1f1f1f;
    --line: #2a2a2a;
    --text: #e8e8e8;
    --muted: #9a9a9a;
    --fire: #ff6a1a;
    --fire-2: #ffb347;
    --ember: #ff3b1f;
    --accent: #6dd3ff;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body {
    font-family: 'Segoe UI', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    padding: 40px 20px;
  }
  .wrap { max-width: 1100px; margin: 0 auto; }
  header {
    text-align: center;
    margin-bottom: 60px;
    padding: 50px 30px;
    background: linear-gradient(135deg, #1a0a05 0%, #0a0a0a 100%);
    border: 1px solid var(--line);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
  }
  header::before {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(255,106,26,0.08) 0%, transparent 60%);
    animation: pulse 4s ease-in-out infinite;
  }
  @keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.1)} }
  h1 {
    font-size: 2.6em;
    color: var(--fire-2);
    margin-bottom: 12px;
    letter-spacing: -1px;
    position: relative;
  }
  header p { color: var(--muted); font-size: 1.05em; position: relative; }
  h2 {
    font-size: 1.7em;
    color: var(--fire);
    margin: 50px 0 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--line);
    display: flex;
    align-items: center;
    gap: 10px;
  }
  h2 .num {
    background: var(--fire);
    color: #000;
    padding: 2px 12px;
    border-radius: 4px;
    font-size: 0.55em;
    font-weight: 800;
  }
  h3 { color: var(--fire-2); margin: 25px 0 12px; font-size: 1.25em; }
  h4 { color: var(--accent); margin: 20px 0 10px; font-size: 1.05em; }
  p, li { color: var(--text); }
  .panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 20px;
  }
  .panel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
  }
  .card {
    background: var(--panel-2);
    border: 1px solid var(--line);
    border-left: 3px solid var(--fire);
    padding: 18px;
    border-radius: 6px;
  }
  .card h4 { margin-top: 0; }
  table {
    width: 100%;
    border-collapse: collapse;
    margin: 18px 0;
    background: var(--panel-2);
    border-radius: 6px;
    overflow: hidden;
  }
  th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--line); }
  th { background: #1a1a1a; color: var(--fire-2); font-weight: 700; font-size: 0.9em; text-transform: uppercase; letter-spacing: 0.5px; }
  tr:last-child td { border-bottom: none; }
  tr:hover td { background: rgba(255,106,26,0.04); }
  ul, ol { margin-left: 24px; margin-bottom: 14px; }
  li { margin-bottom: 6px; }
  .math {
    background: #0d0d0d;
    border: 1px solid var(--line);
    border-left: 3px solid var(--accent);
    padding: 14px 18px;
    margin: 14px 0;
    border-radius: 4px;
    font-family: 'Cambria Math', Georgia, serif;
    overflow-x: auto;
    color: var(--accent);
  }
  .warn {
    background: linear-gradient(90deg, rgba(255,59,31,0.12) 0%, rgba(255,59,31,0.04) 100%);
    border: 1px solid var(--ember);
    border-left: 4px solid var(--ember);
    padding: 18px 22px;
    margin: 20px 0;
    border-radius: 6px;
  }
  .warn h4 { color: var(--ember); margin-top: 0; }
  .info {
    background: rgba(109,211,255,0.06);
    border: 1px solid var(--accent);
    border-left: 4px solid var(--accent);
    padding: 16px 20px;
    margin: 16px 0;
    border-radius: 6px;
  }
  .badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
  .badge {
    background: var(--panel-2);
    border: 1px solid var(--fire);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85em;
    color: var(--fire-2);
  }
  .diagram {
    background: #0d0d0d;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    text-align: center;
  }
  .diagram svg { max-width: 100%; height: auto; }
  .stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 14px;
    margin: 20px 0;
  }
  .stat {
    background: var(--panel-2);
    border: 1px solid var(--line);
    padding: 18px;
    border-radius: 6px;
    text-align: center;
  }
  .stat .v { font-size: 1.6em; color: var(--fire-2); font-weight: 700; }
  .stat .l { font-size: 0.85em; color: var(--muted); margin-top: 4px; }
  code {
    background: #0d0d0d;
    padding: 2px 6px;
    border-radius: 3px;
    color: var(--accent);
    font-family: 'Consolas', monospace;
    font-size: 0.92em;
  }
  .two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 16px 0;
  }
  @media (max-width: 700px) {
    .two-col { grid-template-columns: 1fr; }
    h1 { font-size: 1.9em; }
  }
  footer {
    margin-top: 60px;
    padding: 30px;
    text-align: center;
    color: var(--muted);
    font-size: 0.9em;
    border-top: 1px solid var(--line);
  }