/* Dark-reference chapter system: diagram-first, dense, technical, coherent. */
*{box-sizing:border-box;margin:0;padding:0}:root{color-scheme:dark;--bg:#020617;--panel:rgba(15,23,42,.62);--panel-solid:#0f172a;--panel-2:#0b1220;--line:#1e293b;--line-2:#334155;--ink:#f8fafc;--body:#a8b3c7;--muted:#94a3b8;--cyan:#22d3ee;--green:#34d399;--violet:#a78bfa;--orange:#fb923c;--rose:#fb7185;--amber:#fbbf24}:root[data-theme="light"]{color-scheme:light;--bg:#f8fafc;--panel:rgba(255,255,255,.82);--panel-solid:#fff;--panel-2:#f1f5f9;--line:#cbd5e1;--line-2:#94a3b8;--ink:#0f172a;--body:#475569;--muted:#64748b}.chapter-page{font-family:'JetBrains Mono','IBM Plex Mono',monospace;background:var(--bg);color:var(--ink);min-height:100vh;padding:30px}.chapter-container{max-width:1280px;margin:auto}.chapter-header{margin-bottom:22px}.title-row{display:flex;align-items:center;gap:13px}.pulse{width:11px;height:11px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 5px color-mix(in srgb,var(--cyan) 12%,transparent);animation:cpulse 2s ease-in-out infinite}.chapter-index{display:block;color:var(--cyan);font-size:9px;font-weight:700;letter-spacing:.1em;margin-bottom:5px}.chapter-header h1{font-size:25px;line-height:1.25;letter-spacing:-.035em}.chapter-header>p{color:var(--muted);font-size:13px;line-height:1.6;margin:8px 200px 0 24px}.scale-line{color:var(--amber);font-size:10px;margin:8px 0 0 24px}.chapter-actions{margin-left:auto;display:flex;gap:8px}.chapter-actions a,.chapter-actions button{font:600 10px inherit;color:var(--body);background:var(--panel);border:1px solid var(--line-2);border-radius:7px;padding:9px 11px;text-decoration:none;cursor:pointer}.chapter-actions a:hover,.chapter-actions button:hover{color:var(--cyan);border-color:var(--cyan)}.diagram-panel{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px;overflow:auto;margin:0 0 20px}.diagram-panel .panel-title{color:var(--ink);font-size:14px;font-weight:700;margin:0 0 12px 3px}.diagram-panel svg{display:block;width:100%;min-width:1050px}.decision-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:20px 0}.decision-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:15px}.decision-head{display:flex;align-items:center;gap:9px;margin-bottom:10px}.dot{width:8px;height:8px;border-radius:50%}.dot.cyan{background:var(--cyan)}.dot.green{background:var(--green)}.dot.violet{background:var(--violet)}.dot.orange{background:var(--orange)}.decision-card h3{font-size:12px}.decision-card ul{list-style:none;color:var(--muted);font-size:10px;line-height:1.65}.decision-card li:before{content:'• ';color:var(--cyan)}.chapter-toc{position:sticky;top:10px;z-index:10;margin:22px 0;padding:14px 16px;background:color-mix(in srgb,var(--panel-solid) 95%,transparent);backdrop-filter:blur(14px);border:1px solid var(--line-2);border-radius:12px;display:flex;gap:8px;flex-wrap:wrap;align-items:center;box-shadow:0 12px 35px rgba(0,0,0,.28)}.chapter-toc strong{font-size:11px;color:var(--ink);margin-right:3px}.chapter-toc a{color:var(--muted);text-decoration:none;font-size:10px;padding:5px 8px;border:1px solid var(--line);border-radius:6px}.chapter-toc a:hover{color:var(--cyan);border-color:var(--cyan)}.tutorial{margin-top:25px}.tutorial>h2{font-size:22px;margin-bottom:7px}.tutorial-lead{color:var(--muted);font-size:12px;line-height:1.7;margin-bottom:17px;max-width:1000px}.chapter{scroll-margin-top:90px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px;margin:16px 0}.chapter h2{font-size:16px;margin-bottom:14px}.chapter h3{font-size:12px;color:var(--cyan);margin:18px 0 8px}.chapter p,.chapter li{color:var(--body);font-size:11.5px;line-height:1.75}.chapter p+p{margin-top:10px}.chapter ul,.chapter ol{padding-left:22px;margin:8px 0}.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.mini{border:1px solid color-mix(in srgb,var(--line-2) 80%,transparent);background:var(--panel-2);border-radius:10px;padding:15px}.mini h3{margin-top:0}.callout{padding:13px 16px;border-left:3px solid var(--cyan);background:color-mix(in srgb,var(--cyan) 10%,var(--panel-2));border-radius:0 8px 8px 0;margin:14px 0;color:var(--body);font-size:11.5px;line-height:1.7}.callout.warn{border-color:var(--amber);background:color-mix(in srgb,var(--amber) 9%,var(--panel-2))}.callout.good{border-color:var(--green);background:color-mix(in srgb,var(--green) 9%,var(--panel-2))}.table-wrap{overflow:auto;margin:12px 0}table{width:100%;border-collapse:collapse;font-size:10.5px;color:var(--body)}th,td{padding:10px 12px;border:1px solid color-mix(in srgb,var(--line-2) 70%,transparent);text-align:left;vertical-align:top}th{background:color-mix(in srgb,var(--panel-2) 88%,var(--cyan) 3%);color:var(--ink)}code{font-family:inherit;color:#7dd3fc;background:var(--panel-2);border:1px solid var(--line-2);padding:2px 5px;border-radius:4px}pre{background:#07101f;color:#cbd5e1;border:1px solid #263449;border-radius:10px;padding:15px;overflow:auto;font:10.5px/1.65 'JetBrains Mono',monospace;margin:12px 0;white-space:pre-wrap}:root[data-theme="light"] pre{background:#0f172a;color:#e2e8f0}.endpoint-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0}.endpoint{display:grid;gap:7px;background:var(--panel-2);border:1px solid var(--line-2);border-radius:9px;padding:13px}.endpoint code{width:max-content;max-width:100%;overflow-wrap:anywhere}.endpoint span{color:var(--muted);font-size:10px}.flow-list{display:grid;gap:8px}.flow-step{display:grid;grid-template-columns:42px 1fr;align-items:start;border:1px solid var(--line);background:var(--panel-2);border-radius:8px;padding:11px}.flow-step span{color:var(--cyan);font-weight:700;font-size:10px}.flow-step p{margin:0}.chapter details{border:1px solid var(--line-2);border-radius:8px;margin:9px 0;background:var(--panel-2)}.chapter summary{cursor:pointer;padding:12px 14px;color:var(--ink);font-size:11px;font-weight:700}.chapter details>div{padding:0 14px 13px}.back{display:inline-block;margin-top:13px;color:var(--muted);font-size:9px;text-decoration:none}.back:hover{color:var(--cyan)}.badge{display:inline-block;font-size:8px;background:var(--green);color:#020617;padding:3px 6px;border-radius:4px;margin-right:7px;font-weight:800}footer{text-align:center;color:#475569;font-size:9px;padding:18px}.page-links{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding:15px 2px;color:var(--muted);font-size:10px}.page-links a{color:inherit}.node,.diagram-title{font-family:'JetBrains Mono',monospace}.diagram-title{fill:#f8fafc;font-size:12px;font-weight:700}.diagram-note{fill:#94a3b8;font:500 8px 'JetBrains Mono',monospace}.node{fill:#f8fafc;font-size:11px;font-weight:700}.node-sub{fill:#94a3b8;font:500 8px 'JetBrains Mono',monospace}.node-kind{fill:#94a3b8;font:600 7px 'JetBrains Mono',monospace;letter-spacing:.08em}.step{fill:#020617;font:800 8px 'JetBrains Mono',monospace}.layer-label{font:700 10px 'JetBrains Mono',monospace;letter-spacing:.08em}.arch-edge{fill:none;stroke:#64748b;stroke-width:1.3}.arch-control{fill:none;stroke:#c4b5fd;stroke-width:1.3;stroke-dasharray:5 5}.arch-async,.seq-failure{fill:none;stroke:#fb923c;stroke-width:1.4;stroke-dasharray:7 6}.edge-label{fill:#94a3b8;font:500 8px 'JetBrains Mono',monospace}.edge-label.warm{fill:#fdba74}.seq-head{fill:#0f172a;stroke:#64748b;stroke-width:1}.life{stroke:#334155;stroke-width:1;stroke-dasharray:4 4}.seq-arrow{fill:none;stroke:#34d399;stroke-width:1.4}.seq-return{fill:none;stroke:#22d3ee;stroke-width:1.4}.message-badge{fill:#172033;stroke:#334155}.message-step{fill:#67e8f9;font:700 7px 'JetBrains Mono',monospace;letter-spacing:.08em}.sequence-label{fill:#cbd5e1;font:500 8px 'JetBrains Mono',monospace}.arch-node rect:first-of-type{fill:#0f172a}.arch-node[data-kind="external"] rect{fill:rgba(30,41,59,.9);stroke:#94a3b8}.arch-node[data-kind="edge"] rect{fill:rgba(120,53,15,.55);stroke:#fbbf24}.arch-node[data-kind="service"] rect{fill:rgba(6,78,59,.66);stroke:#34d399}.arch-node[data-kind="data"] rect{fill:rgba(76,29,149,.64);stroke:#a78bfa}.arch-node[data-kind="stream"] rect{fill:rgba(124,45,18,.7);stroke:#fb923c}.arch-node[data-kind="security"] rect{fill:rgba(136,19,55,.62);stroke:#fb7185}.arch-node[data-kind="ops"] rect{fill:rgba(8,51,68,.65);stroke:#22d3ee}.deployment-boundary{fill:rgba(251,191,36,.02);stroke:#fbbf24;stroke-dasharray:8 5}.boundary-label{fill:#fbbf24;font:700 9px 'JetBrains Mono',monospace}.legend-label{fill:#94a3b8;font:500 8px 'JetBrains Mono',monospace}@keyframes cpulse{50%{opacity:.35;transform:scale(.85)}}
@media(max-width:900px){.chapter-page{padding:16px}.chapter-header>p{margin-right:0}.decision-grid{grid-template-columns:1fr 1fr}.grid2,.endpoint-grid{grid-template-columns:1fr}.chapter-toc{top:4px}.chapter-actions a{display:none}.diagram-panel{padding:11px}.chapter{padding:17px}}
@media(max-width:520px){.chapter-page{padding:10px}.chapter-header h1{font-size:17px;padding-right:0;overflow-wrap:anywhere}.title-row{align-items:flex-start;padding-right:48px}.title-row>div:not(.chapter-actions){min-width:0;max-width:100%}.chapter-actions{position:absolute;right:10px;top:10px}.chapter-actions button{font-size:0;width:40px;height:38px}.chapter-actions button:after{content:'◐';font-size:17px}.chapter-header>p,.scale-line{margin-left:0}.decision-grid{grid-template-columns:1fr}.chapter-toc{overflow-x:auto;flex-wrap:nowrap;scrollbar-width:none}.chapter-toc>*{flex:none}.tutorial>h2{font-size:18px}.chapter h2{font-size:14px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important}}@media print{.chapter-page{background:#fff;color:#111;padding:0}.chapter-actions,.chapter-toc,.back,.page-links{display:none}.chapter,.diagram-panel,.decision-card{break-inside:avoid;box-shadow:none}.chapter{background:#fff}.tutorial p,.tutorial li{color:#333}}
