:root{color-scheme:dark;--bg:#0b191e;--card:#14282f;--line:#30474d;--muted:#aec2c8;--accent:#8ae6bd}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:#eef7f8;font:16px/1.5 system-ui,-apple-system,sans-serif}header{position:sticky;top:0;z-index:3;background:#102b32f5;border-bottom:1px solid var(--line);padding:12px max(16px,calc((100% - 1060px)/2));display:flex;gap:16px;align-items:center;justify-content:space-between}h1{font-size:20px;margin:0}header small{color:var(--muted)}main{max-width:1100px;margin:auto;padding:24px 20px 80px}h2{font-size:21px;margin:0 0 12px}h3{font-size:17px;margin:18px 0 8px}p{margin:8px 0 16px}.muted,small{color:var(--muted)}.grid{display:grid;grid-template-columns:1.25fr 1fr;gap:20px}.card{padding:22px;background:var(--card);border:1px solid var(--line);border-radius:18px;margin-bottom:20px}.card>summary{font-weight:650;cursor:pointer;font-size:19px}.card[open]>summary{margin-bottom:16px}.status{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0}.metric{padding:14px;border:1px solid var(--line);border-radius:12px}.metric strong{display:block;font-size:18px}.metric span{font-size:13px;color:var(--muted)}label{display:block;font-size:14px;color:#d3e4e8;margin:12px 0 5px}input,select,textarea{font:inherit;color:inherit;background:#0b1d23;border:1px solid #496067;border-radius:9px;padding:11px;width:100%;min-height:46px}input[type=checkbox]{width:20px;min-height:20px;vertical-align:middle;margin-right:8px}button,a.link{font:inherit;font-weight:600;border:1px solid #476168;border-radius:10px;background:#23424b;color:#f2fcff;padding:11px 15px;min-height:46px;cursor:pointer;text-decoration:none;display:inline-block}button:hover,a.link:hover{filter:brightness(1.2)}button:disabled{opacity:.45;cursor:not-allowed}.primary{background:var(--accent);color:#102a22;border:0}.danger{background:#973f46;border-color:#dd7276;color:white}.row{display:flex;gap:10px;align-items:end;flex-wrap:wrap}.row>*{flex:1}.row button{flex:0 0 auto}.waypoint{background:#102329;border:1px solid var(--line);border-radius:12px;padding:14px;margin:14px 0}.waypoint h3{margin:0}.waypoint .row .field{min-width:110px}.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.toolbar button{font-size:14px;padding:8px 12px}.notice{border-left:3px solid var(--accent);padding:10px 14px;background:#1d383a;margin:12px 0;overflow-wrap:anywhere}.error{border-color:#ed8588;background:#3c272b}.badge{display:inline-block;border-radius:20px;padding:3px 10px;background:#29494f;font-size:13px}.steps{padding-left:20px}.steps li{padding:5px 0}.hidden{display:none!important}dialog{max-width:520px;width:calc(100% - 32px);background:var(--card);color:inherit;border:1px solid var(--line);border-radius:18px;padding:24px}dialog::backdrop{background:#000b}a{color:var(--accent)}footer{color:var(--muted);font-size:13px;margin-top:20px}#message{position:sticky;top:83px;z-index:2}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:2px}@media(max-width:780px){.grid{display:block}.status{grid-template-columns:1fr 1fr}main{padding:16px 12px 70px}.card{padding:17px}header{padding:10px 14px}h1{font-size:18px}.row>*{min-width:120px}.row button{flex:1}header button{min-width:90px}.metric{padding:11px}}

/* RoamThinker brand and simulation presentation */
:root{--bg:#101319;--card:#19212d;--line:#35445b;--muted:#b2bdcf;--accent:#72a7ff}body{background:radial-gradient(ellipse at 85% 0,#1c2d48,transparent 55%),var(--bg)}header{background:#111821f5;max-width:none;gap:12px}header>div{min-width:0}.primary{background:#155eef;color:#fff}button,a.link{background:#223750;border-color:#4c6383}.primary{background:#155eef}.danger{background:#913942;border-color:#d77982}input,select,textarea{background:#101a27;border-color:#536681}.waypoint{background:#101a27}.notice{background:#21314a}.error{background:#3c272b}.badge{background:#2b4160}.sim-badge{display:inline-block;font-size:11px;letter-spacing:.1em;color:#a7c9ff;border:1px solid #5072a4;border-radius:5px;padding:3px 7px;vertical-align:middle;margin-left:8px}.simulation-intro{padding:22px 0 26px;max-width:850px}.simulation-intro h2{font-size:clamp(1.8rem,4vw,2.6rem);letter-spacing:-.04em}.simulation-intro p{color:#bdc9dc}.sim-eyebrow{font:12px monospace;letter-spacing:.14em}.back-link{display:inline-block;font-size:14px;margin-bottom:10px}.simulation-intro .toolbar button{background:transparent}.card{border-radius:14px}#message{top:90px}#previewContent{white-space:pre-wrap;overflow-wrap:anywhere;max-height:55vh;overflow:auto}summary:focus-visible,a:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:3px}.metric strong{font-variant-numeric:tabular-nums}.metric span{font-size:14px}.status{grid-template-columns:repeat(4,minmax(0,1fr))}.metric{min-width:0;overflow-wrap:anywhere}input[readonly]{color:#aebbd0}footer a{display:inline-block;margin-top:12px}.grid>*{min-width:0}.row>div{min-width:0}dialog .toolbar{gap:12px}@media(max-width:780px){.status{grid-template-columns:repeat(2,minmax(0,1fr))}.sim-badge{display:block;width:max-content;margin:3px 0}header{align-items:center}.row>div{min-width:120px}#message{top:115px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}