@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');
:root{color-scheme:dark;--bg:#050c15;--panel:#0c1724;--panel2:#101f2e;--stroke:#263a4b;--soft:#8da8b7;--ink:#ebf7ff;--cyan:#61e2ff;--blue:#2d91e6;--violet:#8c9cff;font-family:'DM Sans',system-ui,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(circle at 63% -200px,#152c46 0,transparent 650px),var(--bg);font-size:14px}
button,input,select{font:inherit}button,a,select,input{outline-offset:3px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,#gravity-pad:focus-visible{outline:2px solid var(--cyan)}
button{cursor:pointer;border:1px solid var(--stroke);background:#122337;color:var(--ink);border-radius:10px;padding:11px 13px;min-height:41px;font-weight:600;transition:background .16s,border-color .16s}
button:hover:not(:disabled){border-color:#508bae;background:#19354b}button:disabled{opacity:.38;cursor:not-allowed}
a{color:inherit;text-decoration:none}a:hover{color:var(--cyan)}small{display:block}
.header{height:70px;padding:0 clamp(16px,3.7vw,60px);border-bottom:1px solid #1b3041;display:flex;align-items:center;justify-content:space-between;gap:20px}
.identity{display:flex;align-items:center;gap:13px;font-family:'Space Grotesk',sans-serif;font-size:19px;font-weight:700;letter-spacing:.08em}
.identity strong{color:var(--cyan)}.identity small{font:700 9px 'DM Sans',sans-serif;letter-spacing:.23em;color:#8aafc3;margin-top:2px}
.mark{display:grid;place-items:center;width:42px;height:42px;border:1px solid #30758f;border-radius:12px;color:var(--cyan);font-size:24px;background:#0f3141;position:relative}
.mark span{font-size:17px;color:#a2efff;position:absolute;right:4px;top:0}
.header nav{display:flex;align-items:center;gap:18px;color:var(--soft);font-size:11px;font-weight:700;letter-spacing:.06em}
.build,.edition{background:rgba(48,159,211,.12);border:1px solid #326080;padding:8px 12px;border-radius:7px;color:var(--cyan);white-space:nowrap}
.intro,.layout,.bottom{width:min(1560px,calc(100% - 2*clamp(16px,3.8vw,60px)));margin-inline:auto}
.intro{padding:40px 0 32px;display:flex;justify-content:space-between;align-items:flex-end;gap:30px}
.eyebrow,.engine-tag,.section-head span,.edition,.stage-head,.stage-legend,.control-hint,.settings-top small,.metrics span{font-size:10px;font-weight:700;letter-spacing:.13em}
.eyebrow{color:#a0c9db}.eyebrow i,.signal{display:inline-block;width:7px;height:7px;border-radius:50%;background:#53dcde;box-shadow:0 0 12px #00cfff;margin-right:9px}
h1,h2,h3,p{margin:0}h1,h2,h3{font-family:'Space Grotesk',sans-serif}h1{font-size:clamp(34px,4vw,58px);line-height:1.04;margin:11px 0 12px;letter-spacing:-.055em}
h1 em{font-style:normal;color:var(--cyan)}.intro p{max-width:680px;line-height:1.65;color:#a5bccc}
.engine-tag{border-left:1px solid #34617c;color:#91b3ca;padding-left:20px;min-width:196px;line-height:1.9}
.engine-tag strong{display:block;color:var(--ink);font-size:16px;letter-spacing:.04em}.engine-tag small{letter-spacing:.08em;color:#7dbacc}
.layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,360px);align-items:start;gap:18px}
.sim-column{min-width:0}.stage{overflow:hidden;border:1px solid #28516c;border-radius:17px;background:#071525;box-shadow:0 22px 72px #0005;position:relative}
.stage-head,.stage-legend{display:flex;align-items:center;justify-content:space-between;gap:10px;background:#0b1c2c;padding:11px 17px;color:#b6d6e6}
.stage-head{border-bottom:1px solid #234053}.stage-head span:last-child{color:#7be9ff}
#fluid{display:block;width:100%;height:clamp(410px,51vw,630px);touch-action:none;cursor:crosshair;user-select:none}
#fluid.stirring{cursor:grabbing}.stage-legend{border-top:1px solid #203a51;border-bottom:1px solid #203a51;font-size:9px;color:#6fa1b6}
.stage-controls{padding:12px;display:flex;gap:8px;flex-wrap:wrap;background:#0a1b2a}
.stage-controls button{flex:1;white-space:nowrap;font-size:12px}.stage-controls button.primary{background:linear-gradient(110deg,#2ca6db,#225abc);border-color:#3c93e5;color:#fff}
.stage-controls .tilt-button{border-color:#2b8798;color:#92e9ff}
.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:13px 0}
.metrics>div{min-width:0;padding:16px 8px;text-align:center;border:1px solid #213648;border-radius:11px;background:#0c1826}
.metrics strong{font:600 clamp(14px,2vw,24px) 'Space Grotesk',sans-serif;display:block;white-space:nowrap}
.metrics span{display:block;margin-top:6px;color:#7c9bad;letter-spacing:.1em;font-size:9px}
#status{min-height:21px;padding-left:4px;color:#8dc6ce;font-size:12px}#status.error{color:#ffa2a0}
.notes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:27px}
.notes>div{border-top:1px solid #2e526b;padding-top:15px}.notes b{font-size:12px}.cyan{color:var(--cyan);margin-right:5px}.notes p{font-size:12px;color:#89a5b7;line-height:1.65;margin-top:8px}
.settings{border-radius:17px;background:linear-gradient(165deg,#101d2b,#0b1623);border:1px solid #233b4d;overflow:hidden}
.settings-top{display:flex;align-items:center;justify-content:space-between;padding:20px;border-bottom:1px solid #2a4051}
.settings-top small{color:#73afc3}.settings-top h2{font-size:24px;margin-top:5px;letter-spacing:-.04em}
.control-group{padding:18px 20px;border-bottom:1px solid #253a49}.control-group:last-child{border-bottom:0}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:19px}
.section-head h3{font-size:14px;font-weight:600}.section-head span{color:#6b95a9;font-size:8px;white-space:nowrap}
.segmented{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;margin-bottom:16px;padding:4px;border-radius:10px;background:#071320}
.segmented button{font-size:11px;padding:8px 5px;min-height:35px;border:1px solid transparent;background:transparent;color:#9cb6c8}
.segmented button[aria-pressed=true]{background:#173953;border-color:#367a9b;color:#bcecff}
.pad-row{display:flex;align-items:center;gap:19px;margin-bottom:18px}
#gravity-pad{flex-shrink:0;width:116px;height:116px;position:relative;touch-action:none;cursor:grab;background:radial-gradient(circle,#103a51 0,#0b2134 50%,#091927 100%);border:1px solid #28546c;border-radius:50%;overflow:hidden}
#gravity-pad .pad-x,#gravity-pad .pad-y{position:absolute;background:#40647b80;pointer-events:none}
.pad-x{width:100%;height:1px;left:0;top:50%}.pad-y{height:100%;width:1px;left:50%;top:0}
#gravity-dot{position:absolute;display:block;width:19px;height:19px;left:50%;top:100%;transform:translate(-50%,-50%);background:#66e5ff;border:3px solid #d4faff;box-shadow:0 0 20px #27c8ff;border-radius:50%;pointer-events:none}
.pad-row p{font-size:11px;color:#9ab3c4;line-height:1.7}.pad-row p b{color:#b4eeff}
.slider-line{display:block;margin:0 0 19px}.slider-line:last-child{margin-bottom:0}
.slider-line>span{display:flex;justify-content:space-between;gap:8px;align-items:center;margin-bottom:9px;color:#bdd3df;font-size:12px}
.slider-line output{color:#74d9ff;font-family:'Space Grotesk',sans-serif;font-weight:600;font-variant-numeric:tabular-nums}
input[type=range]{display:block;width:100%;margin:0;accent-color:#55cfe9;cursor:pointer;min-height:20px}
.inputs-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.inputs-2 label,.wide-label{display:block;font-size:11px;color:#aac6d6;line-height:1.8}
select{color:#d2eaf8;background:#0b2233;border:1px solid #325168;border-radius:8px;padding:10px 9px;width:100%;margin-top:6px;min-height:43px}
.wide-label{margin-top:13px}.control-hint{font-weight:400;line-height:1.55;color:#83a0b2;margin-top:10px;letter-spacing:0}
.actions{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.actions button{font-size:11px;padding:10px 7px}
.micro-stats{display:grid;gap:7px;margin-top:15px;padding-top:13px;border-top:1px solid #274054}
.micro-stats>span{display:flex;justify-content:space-between;color:#839fb2;font-size:11px}.micro-stats b{color:#cce9f2;font-variant-numeric:tabular-nums}
.bottom{display:grid;grid-template-columns:1.25fr 1fr;gap:50px;padding:50px 0 65px;margin-top:36px;border-top:1px solid #263e51}
.bottom h2{margin:10px 0 15px;font-size:26px}.bottom p{max-width:680px;color:#9db8c8;line-height:1.8;font-size:13px}.bottom .disclaimer{margin-top:14px;color:#7393a8;font-size:11px}
.history-box{border-left:1px solid #284254;padding-left:30px}.history-box article{border-top:1px solid #26445a;padding:13px 0}
.history-box article h3{font-size:13px}.history-box article p{font-size:11px;margin-top:7px}.history-box>a{display:inline-block;margin-top:15px;color:var(--cyan)}
footer{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #1d3142;padding:23px clamp(16px,3.7vw,60px);font-size:10px;color:#7493a9;letter-spacing:.08em}
.skip{position:absolute;left:-999px;z-index:20}.skip:focus{left:10px;top:10px;background:#123c53;padding:10px}
@media(max-width:1100px){.layout{grid-template-columns:minmax(0,1fr) minmax(290px,330px)}.intro{padding-top:26px}#fluid{height:clamp(430px,48vw,610px)}.stage-controls button{flex-basis:40%}}
@media(max-width:820px){.header{height:56px;padding:0 15px}.identity{font-size:15px}.mark{width:34px;height:34px}.header nav{gap:9px;font-size:9px}.header nav .build{display:none}.intro{padding:22px 0}.intro .engine-tag{display:none}.layout{display:block}.sim-column{position:relative}.stage{border-radius:12px}
#fluid{height:min(56dvh,470px);min-height:270px}.stage-controls{padding:9px}.stage-controls button{flex-basis:auto;min-height:40px;padding:8px 10px}
.metrics{gap:5px;margin:9px 0}.metrics>div{padding:10px 3px}.metrics span{font-size:8px}
.settings{margin-top:18px}.notes{display:none}.bottom{grid-template-columns:1fr;gap:25px}.history-box{padding:20px 0 0;border-left:0;border-top:1px solid #284254}
}
@media(max-width:520px){.header nav a:last-of-type{display:none}.identity small{font-size:8px}
h1{font-size:clamp(29px,8vw,42px)}.intro{padding:17px 0}.intro p{font-size:12px}
.stage-head,.stage-legend{padding:9px 11px;font-size:9px}.stage-legend span:last-child{display:none}
#fluid{height:47dvh;min-height:230px}
.stage-controls{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;padding:7px}
.stage-controls button{min-width:0;white-space:normal;font-size:10px;padding:6px 3px;min-height:42px}
.settings-top{padding:18px}.control-group{padding:18px}.bottom{margin-top:10px;padding-top:32px}
footer{font-size:9px}.metrics strong{font-size:15px}.metrics span{font-size:7px}
}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}