*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

  @media print {
    @page { size: A4; margin: 8mm; }
  }

  :root {
    --bg:         #0A0F1E;
    --surface:    rgba(26,32,53,0.82);
    --border:     rgba(99,102,241,0.18);
    --dim:        #5B6478;
    --muted:      #94A3B8;
    --text:       #C9D1D9;
    --text-bright:#F0EDE6;

    --blue:       #58A6FF;
    --blue-dim:   #1F3A5F;
    --green:      #3FB950;
    --green-dim:  #1A3A1A;
    --amber:      #E3B341;
    --amber-dim:  #3D2E0A;
    --purple:     #BC8CFF;
    --purple-dim: #2A1A4A;
    --cyan:       #39D4C4;
    --cyan-dim:   #0D2E2B;
    --red:        #F85149;
    --red-dim:    #3A0D0D;
    --accent:     #6366F1;
    --accent2:    #14B8A6;
  }

  html { scroll-behavior: smooth; }

  html, body {
    background: var(--bg);
    color: var(--text);
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 13.5px;
    line-height: 1.6;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  body {
    background:
      radial-gradient(circle at 85% 0%, rgba(99,102,241,0.10) 0%, transparent 45%),
      radial-gradient(circle at 0% 30%, rgba(20,184,166,0.06) 0%, transparent 40%),
      var(--bg);
    background-attachment: fixed;
  }

  ::selection { background: rgba(99,102,241,0.35); color: var(--text-bright); }
  ::-webkit-scrollbar { width: 10px; height: 10px; }
  ::-webkit-scrollbar-track { background: var(--bg); }
  ::-webkit-scrollbar-thumb { background: rgba(99,102,241,0.35); border-radius: 6px; }
  ::-webkit-scrollbar-thumb:hover { background: rgba(99,102,241,0.55); }

  .page { max-width: 1180px; margin: 0 auto; padding: 22px 20px 80px; }
  a { color: var(--blue); }
  a:hover { color: var(--accent2); }

  /* ── HEADER ──────────────────────────────────────────── */
  .header { border-bottom: 2px solid var(--border); padding-bottom: 14px; margin-bottom: 16px; }
  .header-top { display: flex; align-items: baseline; gap: 10px; justify-content: space-between; flex-wrap: wrap; }
  .header-left { display: flex; align-items: baseline; gap: 10px; }
  .prompt { color: var(--green); font-weight: 700; font-size: 20px; }
  .title { font-size: 24px; font-weight: 800; color: var(--text-bright); letter-spacing: -0.3px; }
  .subtitle { color: var(--muted); font-size: 12.5px; margin-top: 4px; padding-left: 18px; }
  .toc { font-size: 11px; color: var(--dim); text-align: right; line-height: 1.7; max-width: 320px; }
  .toc b { color: var(--muted); }

  /* ── NAV / JUMP BAR ──────────────────────────────────── */
  .navbar { display:flex; flex-wrap:wrap; gap:6px; background:var(--surface); backdrop-filter: blur(10px); border:1px solid var(--border); border-radius:10px; padding:10px 14px; margin-bottom:16px; position: sticky; top: 0; z-index: 10; }
  .navbar a { font-size:11px; color:var(--blue); background:var(--blue-dim); padding:3px 8px; border-radius:20px; text-decoration:none; font-weight:600; transition: transform .18s; }
  .navbar a:hover { transform: translateY(-1px); color: var(--blue); }

  .section-label {
    font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--text-bright); margin: 22px 0 8px 0; padding: 6px 10px;
    background: var(--surface); backdrop-filter: blur(10px); border-left: 4px solid var(--accent); border-radius: 6px;
    scroll-margin-top: 50px;
  }
  .section-label.first { margin-top: 0; }
  .sub-label { font-size: 10.6px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--dim); margin: 10px 0 6px; }

  /* ── QUICK REF CARDS ─────────────────────────────────── */
  .cards-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 14px; }
  .cards-grid.c6 { grid-template-columns: repeat(6, 1fr); }
  .cards-grid.c3 { grid-template-columns: repeat(3, 1fr); }
  .card { background: var(--surface); backdrop-filter: blur(10px); border: 1px solid var(--border); border-radius: 10px; padding: 9px 11px; border-left-width: 3px; transition: transform .22s, border-color .22s, box-shadow .22s; }
  .card:hover { transform: translateY(-3px); box-shadow: 0 12px 26px rgba(0,0,0,0.28); }
  .card-name { font-weight: 700; font-size: 13.5px; margin-bottom: 3px; }
  .card-desc { font-size: 11.2px; color: var(--muted); line-height: 1.5; }

  .c-bl { border-left-color: var(--blue); }   .c-bl .card-name { color: var(--blue); }
  .c-gr { border-left-color: var(--green); }  .c-gr .card-name { color: var(--green); }
  .c-am { border-left-color: var(--amber); }  .c-am .card-name { color: var(--amber); }
  .c-pu { border-left-color: var(--purple); } .c-pu .card-name { color: var(--purple); }
  .c-cy { border-left-color: var(--cyan); }   .c-cy .card-name { color: var(--cyan); }
  .c-rd { border-left-color: var(--red); }    .c-rd .card-name { color: var(--red); }

  /* ── LEGEND ──────────────────────────────────────────── */
  .legend { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; background: var(--surface); backdrop-filter: blur(10px); border: 1px solid var(--border); border-radius: 10px; padding: 9px 16px; margin-bottom: 16px; }
  .legend-label { font-size: 9.5px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); margin-right: 4px; }
  .legend-items { display: flex; flex-wrap: wrap; gap: 14px; }
  .legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; }
  .dot { width: 9px; height: 9px; border-radius: 50%; flex-shrink: 0; }
  .dot-bl { background: var(--blue); } .dot-gr { background: var(--green); } .dot-am { background: var(--amber); }
  .dot-pu { background: var(--purple); } .dot-cy { background: var(--cyan); } .dot-rd { background: var(--red); }

  /* ── NAMING / KEY POINTS ─────────────────────────────── */
  .naming-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-bottom: 14px; }
  .naming-grid.c1 { grid-template-columns: 1fr; }
  .naming-card { background: var(--surface); backdrop-filter: blur(10px); border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px; display: flex; align-items: center; gap: 8px; transition: transform .2s, border-color .2s; }
  .naming-card:hover { transform: translateY(-2px); border-color: rgba(99,102,241,0.4); }
  .naming-prefix { font-weight: 700; font-size: 12.5px; color: var(--text-bright); background: rgba(99,102,241,0.16); border-radius: 5px; padding: 2px 7px; white-space: nowrap; }
  .naming-arrow { color: var(--dim); font-size: 12.5px; }
  .naming-meaning { font-size: 11.4px; color: var(--muted); }

  /* ── PANELS ──────────────────────────────────────────── */
  .tree-panel, .table-panel, .flow-panel, .cmp-panel { background: var(--surface); backdrop-filter: blur(10px); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; margin-bottom: 10px; overflow: hidden; transition: border-color .22s; }
  .tree-panel:hover, .table-panel:hover, .flow-panel:hover, .cmp-panel:hover { border-color: rgba(99,102,241,0.4); }
  .tree-title { font-size: 11px; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--dim); margin-bottom: 8px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }

  .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
  .three-col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
  .bottom-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px; }

  /* ── API TABLE (definition-style rows) ──────────────── */
  .api-table { width: 100%; border-collapse: collapse; font-size: 12.1px; }
  .api-table td { padding: 4px 6px; vertical-align: top; border-bottom: 1px solid var(--border); }
  .api-table tr:last-child td { border-bottom: none; }
  .api-code { font-weight: 700; white-space: nowrap; }
  .api-code.bl { color: var(--blue); } .api-code.am { color: var(--amber); } .api-code.pu { color: var(--purple); }
  .api-code.cy { color: var(--cyan); } .api-code.rd { color: var(--red); } .api-code.gr { color: var(--green); }
  .api-desc { color: var(--muted); }
  .api-desc code, .tree-body code { color: var(--text); background: var(--bg); padding: 0 4px; border-radius: 4px; }

  /* ── REGULAR TABLES ──────────────────────────────────── */
  table.grid-table { width: 100%; border-collapse: collapse; font-size: 12px; }
  table.grid-table th { text-align: left; color: var(--dim); font-size: 10.6px; letter-spacing: 0.06em; text-transform: uppercase; padding: 5px 7px; border-bottom: 1px solid var(--border); background: rgba(10,15,30,0.4); }
  table.grid-table td { padding: 5px 7px; border-bottom: 1px solid var(--border); color: var(--text); vertical-align: top; }
  table.grid-table tr:last-child td { border-bottom: none; }
  table.grid-table td.yes { color: var(--green); font-weight: 700; }
  table.grid-table td.no { color: var(--red); font-weight: 700; }
  table.grid-table td.cell-hl { color: var(--amber); font-weight: 600; }
  table.grid-table td.k { color: var(--blue); font-weight: 600; white-space: nowrap; }
  table.grid-table td.k2 { color: var(--purple); font-weight: 600; white-space: nowrap; }

  /* ── FLOW DIAGRAM ─────────────────────────────────────── */
  .flow-row { display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
  .flow-row.vertical { flex-direction: column; }
  .flow-box { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 5px 11px; font-size: 12px; color: var(--text-bright); text-align: center; font-weight: 500; white-space: nowrap; }
  .flow-box.source { border-color: var(--cyan);  color: var(--cyan); font-weight: 700; }
  .flow-box.inter  { border-color: var(--blue);  color: var(--blue); }
  .flow-box.term   { border-color: var(--amber); color: var(--amber); font-weight: 700; }
  .flow-box.warn   { border-color: var(--red); color: var(--red); font-weight: 700; }
  .flow-box.ok     { border-color: var(--green); color: var(--green); font-weight: 700; }
  .flow-arrow { color: var(--dim); font-size: 15px; }
  .flow-arrow.down { display:block; text-align:center; }
  .flow-sub-title { font-size: 10.6px; color: var(--muted); text-align: center; margin-top: 8px; margin-bottom: 3px; letter-spacing: 0.05em; text-transform: uppercase; }

  /* ── COMPARISON PANEL ─────────────────────────────────── */
  .cmp-panel { display: flex; flex-direction: column; gap: 8px; }
  .cmp-card { background: rgba(10,15,30,0.55); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; }
  .cmp-header { display: flex; align-items: center; gap: 8px; margin-bottom: 5px; }
  .cmp-name { font-weight: 700; font-size: 13.5px; }
  .cmp-name.bl { color: var(--blue); } .cmp-name.pu { color: var(--purple); } .cmp-name.gr { color: var(--green); } .cmp-name.am { color: var(--amber); }
  .cmp-rows { display: flex; flex-direction: column; gap: 3px; }
  .cmp-row { display: flex; gap: 6px; font-size: 11.4px; align-items: baseline; }
  .cmp-key { color: var(--dim); white-space: nowrap; min-width: 76px; }
  .cmp-val { color: var(--text); }
  .cmp-val.code { color: var(--amber); font-weight: 600; }
  .cmp-val.green { color: var(--green); } .cmp-val.purple { color: var(--purple); }
  .cmp-divider { height: 1px; background: var(--border); }

  /* pillar / category grid (ACID, metrics, security layers) */
  .pillar-panel { background: var(--surface); backdrop-filter: blur(10px); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; margin-bottom: 10px; }
  .pillar-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
  .pillar-grid.c5 { grid-template-columns: repeat(5, 1fr); }
  .pillar-card { background: rgba(10,15,30,0.55); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; border-top-width: 3px; transition: transform .2s; }
  .pillar-card:hover { transform: translateY(-2px); }
  .pillar-card.p-bl { border-top-color: var(--blue); } .pillar-card.p-gr { border-top-color: var(--green); }
  .pillar-card.p-am { border-top-color: var(--amber); } .pillar-card.p-pu { border-top-color: var(--purple); }
  .pillar-card.p-cy { border-top-color: var(--cyan); } .pillar-card.p-rd { border-top-color: var(--red); }
  .pillar-name { font-weight: 700; font-size: 12.5px; margin-bottom: 4px; }
  .pillar-name.bl{color:var(--blue);} .pillar-name.gr{color:var(--green);} .pillar-name.am{color:var(--amber);}
  .pillar-name.pu{color:var(--purple);} .pillar-name.cy{color:var(--cyan);} .pillar-name.rd{color:var(--red);}
  .pillar-def { font-size: 10.8px; color: var(--muted); line-height: 1.45; }
  .pillar-example { font-size: 10.4px; color: var(--text); margin-top: 4px; border-top: 1px dashed var(--border); padding-top: 4px; }
  .pillar-example b { color: var(--text-bright); }

  /* ── PROBLEM / SCENARIO CARDS ─────────────────────────── */
  .problem-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
  .problem-card { background: var(--surface); backdrop-filter: blur(10px); border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px; border-left: 3px solid var(--green); transition: transform .2s; page-break-inside: avoid; }
  .problem-card:hover { transform: translateY(-2px); }
  .problem-title { font-size: 12px; font-weight: 700; color: var(--green); margin-bottom: 4px; }
  .problem-body { font-size: 11px; color: var(--muted); line-height: 1.5; }
  .problem-body b { color: var(--text); }

  .code-block { font-size: 11.2px; color: var(--text); background: var(--bg); border-radius: 6px; padding: 6px 8px; white-space: pre; overflow: hidden; line-height: 1.5; border: 1px solid var(--border); }
  .code-block .kw { color: var(--purple); } .code-block .mt { color: var(--blue); } .code-block .cl { color: var(--amber); }
  .code-block .an { color: var(--green); } .code-block .cm { color: var(--muted); }

  /* ── REVISION SUMMARY ─────────────────────────────────── */
  .revision-panel { background: var(--surface); backdrop-filter: blur(10px); border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; }
  .revision-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 5px 20px; }
  .revision-item { font-size: 11.8px; color: var(--text); display: flex; gap: 6px; }
  .revision-item .chk { color: var(--green); font-weight: 700; }

  footer { text-align:center; color: var(--dim); font-size: 11px; margin-top: 26px; padding-top: 12px; border-top: 1px solid var(--border); }

  @media (max-width: 900px) {
    .cards-grid, .cards-grid.c6, .cards-grid.c3 { grid-template-columns: repeat(2, 1fr); }
    .naming-grid, .naming-grid.c1 { grid-template-columns: 1fr; }
    .two-col, .three-col, .bottom-grid, .problem-grid { grid-template-columns: 1fr; }
    .pillar-grid, .pillar-grid.c5 { grid-template-columns: repeat(2, 1fr); }
    .revision-grid { grid-template-columns: 1fr; }
    .navbar { position: static; }
    .toc { text-align: left; max-width: none; }
  }

  @media print {
    html, body { width: 210mm; font-size: 9.5px; background: #0D1117; }
    .page { padding: 0; }
    .card:hover, .naming-card:hover, .problem-card:hover, .pillar-card:hover,
    .tree-panel:hover, .table-panel:hover, .flow-panel:hover, .cmp-panel:hover { transform: none; box-shadow: none; }
    .tree-panel, .table-panel, .flow-panel, .cmp-panel, .pillar-panel, .problem-card { page-break-inside: avoid; }
    .navbar { display:none; }
  }