:root{
  --bg:#040711;--panel:rgba(7,12,23,.74);--line:rgba(145,181,230,.16);--line-strong:rgba(145,181,230,.34);
  --text:#eef5ff;--muted:#8796aa;--faint:#45536a;--primary:#7ab1ff;--secondary:#a58bff;--accent:#5ddbd4;
  --warm:#f3aa72;--success:#78dcb0;--danger:#f08a82;
}
*{box-sizing:border-box}html,body{width:100%;height:100%;margin:0;overflow:hidden;background:var(--bg)}
body{color:var(--text);font-family:"Space Grotesk","Inter",system-ui,sans-serif;-webkit-font-smoothing:antialiased;user-select:none;transition:background-color .6s ease}
button,a,input{font:inherit}#stage{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}.fx{position:fixed;inset:0;pointer-events:none}
.fx-aurora{opacity:.92;background:radial-gradient(ellipse 44% 34% at 54% 42%,color-mix(in srgb,var(--primary) 18%,transparent),transparent 68%),radial-gradient(ellipse 34% 27% at 68% 36%,color-mix(in srgb,var(--secondary) 14%,transparent),transparent 72%),radial-gradient(ellipse 24% 20% at 40% 57%,color-mix(in srgb,var(--accent) 9%,transparent),transparent 74%);filter:blur(22px) saturate(1.16);transform:scale(1.08);transition:background .65s ease}
.fx-stars{opacity:.42;background-image:radial-gradient(circle at 12% 18%,rgba(255,255,255,.6) 0 1px,transparent 1.4px),radial-gradient(circle at 72% 24%,rgba(126,180,255,.55) 0 1px,transparent 1.5px),radial-gradient(circle at 44% 76%,rgba(181,154,255,.45) 0 1px,transparent 1.5px),radial-gradient(circle at 86% 68%,rgba(103,225,214,.45) 0 1px,transparent 1.4px);background-size:173px 173px,241px 241px,311px 311px,397px 397px;animation:starDrift 55s linear infinite}
@keyframes starDrift{to{transform:translate3d(-90px,40px,0)}}
.fx-grid{opacity:.17;background-image:linear-gradient(rgba(113,151,201,.032) 1px,transparent 1px),linear-gradient(90deg,rgba(113,151,201,.032) 1px,transparent 1px);background-size:42px 42px;mask-image:radial-gradient(circle at 54% 46%,#000 0,rgba(0,0,0,.82) 35%,transparent 84%)}
.fx-vignette{background:radial-gradient(circle at 54% 46%,transparent 0 30%,rgba(4,7,17,.15) 61%,rgba(4,7,17,.9) 100%)}
.fx-grain{opacity:.03;mix-blend-mode:soft-light;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.75'/%3E%3C/svg%3E")}
body[data-mode="streams"],body[data-mode="constellation"]{--primary:#6ccaff;--secondary:#908cff;--accent:#58e0d0}
body[data-mode="boundary"],body[data-mode="orbital"]{--primary:#8bb7ff;--secondary:#b58cff;--accent:#79d8b1;--warm:#f1a46d}
body[data-mode="return"],body[data-mode="comets"]{--primary:#79b0ff;--secondary:#a68aff;--accent:#69d7c7}
body[data-mode="polaris"],body[data-mode="stellar"]{--primary:#9ec8ff;--secondary:#bda7ff;--accent:#83eee3}
body[data-mode="nebula"]{--primary:#8e9cff;--secondary:#c08eff;--accent:#69d2df}
.topbar{position:fixed;z-index:20;top:0;left:0;right:0;display:flex;align-items:center;justify-content:space-between;padding:18px clamp(16px,3vw,48px);pointer-events:none}.brand,.main-link,.language-toggle{pointer-events:auto}.brand{display:flex;align-items:baseline;gap:12px;text-decoration:none;color:var(--text);font:700 14px/1 "JetBrains Mono",monospace;letter-spacing:.22em;text-shadow:0 0 26px color-mix(in srgb,var(--primary) 24%,transparent)}.brand small{font-size:10px;color:var(--muted);letter-spacing:.14em}.accent{color:var(--primary)}.top-actions{display:flex;align-items:center;gap:10px}.build-tag{color:var(--faint);font:600 9px/1 "JetBrains Mono",monospace;letter-spacing:.12em}.main-link{padding:9px 13px;border:1px solid var(--line);border-radius:999px;color:var(--muted);text-decoration:none;font-size:11px;background:rgba(7,11,19,.48);backdrop-filter:blur(14px)}
.language-toggle{display:flex;padding:3px;border:1px solid var(--line);border-radius:999px;background:rgba(7,11,19,.55);backdrop-filter:blur(14px)}.language-toggle button{border:0;border-radius:999px;padding:6px 9px;background:transparent;color:var(--faint);font:600 9px/1 "JetBrains Mono",monospace;cursor:pointer}.language-toggle button.active{background:color-mix(in srgb,var(--primary) 16%,transparent);color:var(--text);box-shadow:0 0 18px color-mix(in srgb,var(--primary) 14%,transparent)}
.rail{position:fixed;z-index:12;left:clamp(14px,2.5vw,42px);top:82px;bottom:72px;width:min(290px,23vw);display:grid;gap:6px;overflow-y:auto;padding:4px 7px 4px 0;scrollbar-width:thin;scrollbar-color:var(--line) transparent}.experiment{position:relative;display:grid;grid-template-columns:30px 1fr;gap:9px;align-items:start;width:100%;padding:10px 11px;border:1px solid transparent;border-radius:11px;background:transparent;color:var(--faint);text-align:left;cursor:pointer;transition:.22s ease}.experiment::before{content:"";position:absolute;inset:0 auto 0 0;width:2px;opacity:0;background:linear-gradient(var(--primary),var(--secondary));box-shadow:0 0 18px var(--primary)}.experiment:hover,.experiment.active{color:var(--text);background:linear-gradient(90deg,rgba(20,31,48,.72),rgba(10,16,26,.44));border-color:var(--line);backdrop-filter:blur(15px)}.experiment.active::before{opacity:1}.experiment .num{padding-top:2px;color:var(--primary);font:600 10px/1 "JetBrains Mono",monospace}.experiment .label{display:grid;gap:3px}.experiment b{font-size:11.5px}.experiment small{color:var(--muted);font:400 9.5px/1.4 "Inter",sans-serif}
.scene-copy{position:fixed;z-index:9;left:50%;bottom:clamp(70px,9vh,104px);width:min(760px,55vw);transform:translateX(-34%);text-align:center;pointer-events:none}.eyebrow{margin:0 0 11px;color:var(--primary);font:600 10px/1 "JetBrains Mono",monospace;letter-spacing:.18em}.scene-copy h1{margin:0;font-size:clamp(24px,3vw,44px);letter-spacing:-.045em;line-height:1.12;text-wrap:balance}.description{max-width:660px;margin:13px auto 0;color:var(--muted);font:400 13px/1.62 "Inter",sans-serif;text-wrap:balance}.instruction{margin-top:15px;color:#a9b8cb;font:500 10px/1 "JetBrains Mono",monospace;letter-spacing:.08em}.instruction kbd{margin-right:7px;padding:4px 6px;border:1px solid color-mix(in srgb,var(--primary) 34%,transparent);border-radius:5px;background:color-mix(in srgb,var(--primary) 10%,transparent);color:var(--primary)}
.control-panel{position:fixed;z-index:13;right:clamp(14px,2.5vw,42px);top:50%;transform:translateY(-50%);width:214px;padding:14px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(145deg,rgba(11,18,30,.82),rgba(7,11,18,.67));backdrop-filter:blur(18px);box-shadow:0 20px 80px rgba(0,0,0,.28)}.control-row{display:grid;gap:8px}.control-row+.control-row{margin-top:14px;padding-top:14px;border-top:1px solid rgba(136,169,211,.1)}.metrics{grid-template-columns:repeat(3,1fr)}.metrics span{display:grid;gap:4px}.metrics i{color:var(--faint);font:600 8px/1 "JetBrains Mono",monospace}.metrics b{color:#bccde1;font:600 10px/1 "JetBrains Mono",monospace}.sliders label{display:grid;grid-template-columns:58px 1fr;align-items:center;gap:8px;color:var(--faint);font:600 8px/1 "JetBrains Mono",monospace}.sliders input{width:100%;accent-color:var(--primary)}.buttons{grid-template-columns:1fr 1fr}.buttons button:last-child{grid-column:1/-1}.buttons button{padding:8px;border:1px solid var(--line);border-radius:7px;background:color-mix(in srgb,var(--primary) 4%,transparent);color:var(--muted);font:600 8px/1 "JetBrains Mono",monospace;cursor:pointer}.buttons button:hover{color:var(--text);border-color:var(--line-strong)}
.mode-indicator{position:fixed;z-index:9;left:50%;top:82px;transform:translateX(-22%);display:flex;align-items:center;gap:10px;color:var(--faint);font:600 9px/1 "JetBrains Mono",monospace;letter-spacing:.12em}.mode-indicator span{color:var(--primary)}.mode-indicator i{width:42px;height:1px;background:linear-gradient(90deg,var(--primary),transparent)}.quality-badge{position:fixed;z-index:9;right:clamp(14px,2.5vw,42px);bottom:22px;display:flex;align-items:center;gap:7px;color:var(--faint);font:600 8px/1 "JetBrains Mono",monospace}.quality-dot{width:5px;height:5px;border-radius:50%;background:var(--success);box-shadow:0 0 10px var(--success)}.transitioning .scene-copy,.transitioning .mode-indicator{opacity:.18;filter:blur(4px)}.scene-copy,.mode-indicator{transition:.35s ease}
@media(max-width:1100px){.build-tag{display:none}.rail{width:245px}.scene-copy{width:52vw}}
@media(max-width:980px){.rail{top:auto;left:12px;right:12px;bottom:10px;width:auto;height:58px;display:flex;overflow-x:auto;overflow-y:hidden;gap:5px;padding:0 2px 4px;scroll-snap-type:x proximity}.experiment{flex:0 0 116px;grid-template-columns:1fr;padding:8px;text-align:center;scroll-snap-align:start}.experiment .num,.experiment small{display:none}.experiment::before{inset:auto 12% 0;width:auto;height:2px}.control-panel{right:14px;top:74px;transform:none;width:186px}.scene-copy{bottom:86px;width:calc(100vw - 52px);transform:translateX(-50%)}.mode-indicator{left:18px;top:76px;transform:none}.quality-badge{display:none}}
@media(max-width:640px){.topbar{padding:13px}.brand small{display:none}.main-link{display:none}.language-toggle button{padding:6px 8px}.control-panel{top:auto;right:10px;bottom:76px;width:160px;padding:10px}.sliders{display:none}.scene-copy{bottom:112px;width:calc(100vw - 24px)}.scene-copy h1{font-size:clamp(20px,7vw,29px)}.description{font-size:11.5px;line-height:1.5;max-width:390px}.instruction{margin-top:10px;font-size:9px}.mode-indicator{display:none}.rail{height:54px}.experiment{flex-basis:108px;padding:7px 5px}.fx-grid{display:none}}
@media(prefers-reduced-motion:reduce){.fx-stars{animation:none}.fx-grain{display:none}}