:root{
  color-scheme:dark;
  --bg:#02040b; --glass:rgba(6,12,25,.54); --glass2:rgba(7,14,31,.72); --line:rgba(178,214,255,.22);
  --text:#f3f7ff; --muted:#9fb0c8; --blue:#7dc8ff; --violet:#a780ff; --cyan:#68f0e8; --gold:#ffc66c; --danger:#ff7c9e;
  --safe-top:env(safe-area-inset-top,0px); --safe-bottom:env(safe-area-inset-bottom,0px);
}
*{box-sizing:border-box} html,body{width:100%;height:100%;margin:0;overflow:hidden;background:var(--bg);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text)}
button,input{font:inherit} button{color:inherit} button:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.app{position:fixed;inset:0;background:#02040b;isolation:isolate}
#universeCanvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:crosshair;z-index:1}
.cinematic-backdrop{position:absolute;inset:-3%;z-index:0;background-size:cover;background-position:center;opacity:0;transform:scale(1.05);filter:saturate(1.1) contrast(1.07);transition:opacity 1.4s ease,background-image 1s ease;pointer-events:none}
.cinematic-backdrop::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 52%,transparent 0 30%,rgba(2,4,11,.12) 58%,rgba(2,4,11,.82) 100%),linear-gradient(180deg,rgba(2,4,11,.15),rgba(2,4,11,.45))}
.vignette{position:absolute;inset:0;z-index:4;pointer-events:none;background:radial-gradient(circle at 50% 46%,transparent 0 44%,rgba(0,0,0,.17) 68%,rgba(0,0,0,.6) 100%)}
.grain{position:absolute;inset:0;z-index:5;pointer-events:none;opacity:.055;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='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.6'/%3E%3C/svg%3E")}
.hidden-ui{opacity:0;pointer-events:none}.ui-ready .hidden-ui{opacity:1;pointer-events:auto}.hud-top,.target-panel,.physics-panel,.scale-rail,.nav-compass,.mission-hud,.reticle{transition:opacity .7s ease,transform .7s ease}

/* Intro is a cinematic title card, not a webpage */
.intro{position:absolute;inset:0;z-index:40;display:grid;place-items:center;background:linear-gradient(90deg,rgba(1,3,10,.72),rgba(1,3,10,.16) 54%,rgba(1,3,10,.34)),url('assets/cinematic/cosmos.png') center/cover;transition:opacity 1.15s ease,transform 1.15s ease}
.intro::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 58% 47%,transparent 0 30%,rgba(0,0,0,.1) 54%,rgba(0,0,0,.72) 100%)}
.intro.exit{opacity:0;transform:scale(1.035);pointer-events:none}.intro-space{position:absolute;inset:0;background:linear-gradient(180deg,rgba(2,4,11,.12),rgba(2,4,11,.28))}
.intro-copy{position:absolute;left:7vw;top:50%;transform:translateY(-50%);width:min(710px,80vw);text-shadow:0 4px 30px rgba(0,0,0,.75)}
.intro-orbit{width:58px;height:58px;border:1px solid rgba(190,222,255,.6);border-radius:50%;position:relative;margin-bottom:24px;box-shadow:0 0 42px rgba(94,172,255,.2)}
.intro-orbit span{position:absolute;left:-12px;right:-12px;top:27px;border-top:1px solid rgba(156,208,255,.7);transform:rotate(-18deg)}.intro-orbit i{position:absolute;width:7px;height:7px;border-radius:50%;background:#fff;box-shadow:0 0 14px #7dc8ff;left:42px;top:5px}
.eyebrow,.panel-kicker{margin:0 0 10px;color:#b6c9e5;font-size:11px;font-weight:700;letter-spacing:.28em}.intro h1{font-size:clamp(48px,7.8vw,118px);font-weight:220;letter-spacing:.17em;line-height:.9;margin:0 0 24px;white-space:nowrap}.intro h1 span{font-weight:520;text-shadow:0 0 35px rgba(107,166,255,.4)}
.intro-lede{max-width:650px;color:#e4ecf8;font-size:clamp(16px,1.45vw,22px);line-height:1.65;margin:0 0 30px}.enter-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.enter-button,.ghost-button{border:1px solid rgba(182,218,255,.38);background:rgba(7,13,25,.5);backdrop-filter:blur(18px);min-height:54px;padding:0 22px;cursor:pointer;letter-spacing:.12em;font-size:12px}.enter-button{display:flex;align-items:center;gap:30px;background:rgba(229,241,255,.94);color:#07101f;font-weight:800;border-color:white;box-shadow:0 12px 50px rgba(86,150,255,.23)}.enter-button i{font-style:normal;font-size:20px}.ghost-button:hover{background:rgba(112,171,255,.14)}.intro-hint{color:#9badc5;margin:18px 0 0;font-size:12px;letter-spacing:.07em}

/* HUD */
.hud-top{position:absolute;z-index:15;left:0;right:0;top:0;padding:calc(20px + var(--safe-top)) 28px 16px;display:grid;grid-template-columns:1fr auto 1fr;align-items:start;background:linear-gradient(180deg,rgba(2,4,11,.42),transparent);pointer-events:none}
.identity{display:flex;align-items:center;gap:12px;pointer-events:auto}.identity-mark{width:34px;height:34px;border:1px solid rgba(177,218,255,.48);border-radius:50%;position:relative;box-shadow:0 0 25px rgba(91,163,255,.18)}.identity-mark i{position:absolute;left:3px;right:3px;top:16px;border-top:1px solid rgba(199,225,255,.8);transform:rotate(-22deg)}.identity strong{display:block;font-size:12px;letter-spacing:.25em}.identity small{display:block;color:#93a9c4;margin-top:5px;font-size:9px;letter-spacing:.16em}.hud-center{display:flex;gap:10px}.model-badge,.sim-badge{padding:7px 10px;border:1px solid rgba(179,216,255,.18);background:rgba(3,9,19,.35);backdrop-filter:blur(12px);font-size:9px;letter-spacing:.16em;color:#b8c8dc}.sim-badge{color:#7fffdc;box-shadow:inset 0 0 18px rgba(80,255,205,.06)}
.hud-actions{justify-self:end;display:flex;gap:8px;pointer-events:auto}.hud-icon{width:34px;height:34px;border-radius:50%;border:1px solid rgba(179,216,255,.23);background:rgba(4,10,22,.35);backdrop-filter:blur(12px);cursor:pointer}.hud-icon:hover{background:rgba(102,174,255,.15)}
.target-panel{position:absolute;z-index:16;left:32px;top:50%;transform:translateY(-48%);width:min(365px,34vw);padding:18px 20px 20px;background:linear-gradient(90deg,rgba(5,11,24,.66),rgba(5,11,24,.17));border-left:1px solid rgba(163,210,255,.33);backdrop-filter:blur(10px);pointer-events:auto}.panel-line{height:1px;width:48px;background:linear-gradient(90deg,#8fd5ff,transparent);margin-bottom:13px}.target-panel h2{margin:0 0 10px;font-size:clamp(25px,2.3vw,38px);font-weight:380;letter-spacing:.015em}.target-panel>p:not(.panel-kicker){color:#bfd0e4;line-height:1.56;font-size:13px;margin:0 0 16px}.target-metrics{display:grid;grid-template-columns:repeat(2,1fr);gap:7px;margin:14px 0}.target-metrics div{border-top:1px solid rgba(162,200,240,.14);padding-top:8px}.target-metrics small{display:block;color:#7890ad;font-size:8px;letter-spacing:.18em}.target-metrics b{display:block;margin-top:4px;font-size:12px;font-weight:600}.panel-actions{display:flex;gap:7px;margin-top:16px}.diegetic-button{flex:1;min-height:34px;border:1px solid rgba(156,203,247,.22);background:rgba(7,15,30,.42);font-size:9px;letter-spacing:.14em;cursor:pointer}.diegetic-button:hover{border-color:rgba(132,210,255,.6);background:rgba(81,150,220,.13)}.diegetic-button.accent{background:rgba(113,163,255,.14);border-color:rgba(136,197,255,.38)}
.physics-panel{position:absolute;z-index:16;right:30px;top:50%;transform:translateY(-47%);width:min(355px,31vw);padding:18px 0 12px 22px;border-left:1px solid rgba(155,199,255,.21);text-align:left;pointer-events:auto}.physics-panel .equation{font-family:Georgia,"Times New Roman",serif;font-style:italic;font-size:clamp(17px,1.55vw,25px);line-height:1.4;color:#edf5ff;text-shadow:0 0 22px rgba(104,177,255,.26);margin:9px 0 10px}.physics-panel>p:not(.panel-kicker){font-size:12px;line-height:1.55;color:#9fb4cb}.lens-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;margin-top:15px}.lens-metrics div{border-top:1px solid rgba(156,200,243,.16);padding-top:8px}.lens-metrics small{display:block;font-size:8px;color:#7790ad;letter-spacing:.15em}.lens-metrics strong{font-size:11px}.lens-toggle{margin-top:13px;padding:0;border:0;background:none;color:#8ab6df;font-size:9px;letter-spacing:.12em;cursor:pointer}
.reticle{position:absolute;z-index:12;left:50%;top:50%;width:48px;height:48px;transform:translate(-50%,-50%);pointer-events:none}.reticle i,.reticle b{position:absolute;inset:0;border:1px solid rgba(197,225,255,.23);border-radius:50%}.reticle b{inset:9px;border-style:dashed;animation:spin 13s linear infinite}.reticle span{position:absolute;width:4px;height:4px;left:22px;top:22px;border-radius:50%;background:#ddecff;box-shadow:0 0 12px #7dc8ff}@keyframes spin{to{transform:rotate(360deg)}}
.scale-rail{position:absolute;z-index:17;left:50%;bottom:calc(24px + var(--safe-bottom));transform:translateX(-50%);width:min(870px,70vw);pointer-events:none}.scale-copy{position:absolute;left:0;bottom:27px}.scale-copy small{display:block;font-size:8px;letter-spacing:.19em;color:#8ca3bf}.scale-copy strong{font-size:16px;font-weight:550}.rail-track{position:relative;margin-left:140px;height:34px;border-bottom:1px solid rgba(164,202,239,.34)}.rail-progress{position:absolute;bottom:-1px;left:0;width:0;height:1px;background:linear-gradient(90deg,#7dd3ff,#c284ff);box-shadow:0 0 12px #7db8ff}.rail-handle{position:absolute;bottom:-4px;left:0;width:8px;height:8px;border-radius:50%;background:#eaf7ff;box-shadow:0 0 12px #85c7ff;transform:translateX(-50%)}.rail-mark{position:absolute;bottom:8px;transform:translateX(-50%);font-size:7px;letter-spacing:.13em;color:#70859f}.rail-mark.right{transform:translateX(-100%)}.rail-instruction{text-align:center;color:#617992;font-size:7px;letter-spacing:.15em;margin-top:9px}
.nav-compass{position:absolute;right:28px;bottom:calc(30px + var(--safe-bottom));z-index:17;display:flex;align-items:center;gap:12px;pointer-events:none}.compass-ring{width:68px;height:68px;border:1px solid rgba(163,205,247,.22);border-radius:50%;position:relative}.compass-ring span{position:absolute;font-size:7px;color:#7f96b0}.compass-ring span:nth-child(1){top:5px;left:31px}.compass-ring span:nth-child(2){right:6px;top:30px}.compass-ring span:nth-child(3){bottom:5px;left:31px}.compass-ring span:nth-child(4){left:6px;top:30px}.compass-ring i{position:absolute;left:32px;top:14px;width:2px;height:21px;transform-origin:50% 20px;background:linear-gradient(#b3e0ff,transparent);box-shadow:0 0 10px #79bfff}.nav-copy{display:grid;grid-template-columns:auto auto;gap:4px 8px}.nav-copy b{font-size:7px;letter-spacing:.12em;color:#a7bed5}.nav-copy small{font-size:7px;color:#667f9a}
.mission-hud{position:absolute;z-index:17;left:50%;top:calc(74px + var(--safe-top));transform:translateX(-50%);display:flex;align-items:center;gap:10px;padding:8px 11px;border:1px solid rgba(161,208,255,.16);background:rgba(5,11,23,.38);backdrop-filter:blur(10px);pointer-events:auto}.mission-dot{width:7px;height:7px;border-radius:50%;background:#80e8ff;box-shadow:0 0 12px #80d9ff}.mission-hud small{display:block;font-size:7px;color:#7f9ab8;letter-spacing:.15em}.mission-hud b{display:block;font-size:10px;font-weight:500;margin-top:2px}.mission-hud button{border:0;background:none;color:#7e91a7;cursor:pointer}

/* overlays keep the world behind them */
.guide-overlay,.experiment-overlay,.discovery-overlay,.controls-overlay{position:absolute;inset:0;z-index:30;display:grid;place-items:center;background:rgba(2,5,13,.05);pointer-events:none;opacity:0;transition:opacity .35s ease}.guide-overlay.open,.experiment-overlay.open,.discovery-overlay.open,.controls-overlay.open{opacity:1;pointer-events:auto}.guide-card{position:absolute;bottom:10vh;left:50%;transform:translateX(-50%);width:min(560px,84vw);padding:22px 25px;background:rgba(5,11,24,.7);border:1px solid rgba(164,206,255,.2);backdrop-filter:blur(22px);box-shadow:0 20px 80px rgba(0,0,0,.3)}.guide-card h2{font-weight:360;margin:4px 0 8px}.guide-card p:not(.panel-kicker){color:#a9bdd5;line-height:1.55}.guide-progress{height:1px;background:rgba(160,201,245,.18);margin:16px 0}.guide-progress i{display:block;width:10%;height:100%;background:#82caff;box-shadow:0 0 10px #82caff;transition:width .35s}.guide-controls{display:flex;justify-content:space-between}.guide-controls button{border:1px solid rgba(157,202,246,.2);background:rgba(6,15,30,.45);padding:9px 14px;font-size:9px;letter-spacing:.15em;cursor:pointer}
.experiment-overlay{background:rgba(0,3,9,.7);backdrop-filter:blur(14px)}.experiment-shell{position:absolute;inset:4.5vh 4vw;display:grid;grid-template-columns:minmax(0,1fr) 360px;grid-template-rows:auto 1fr;gap:0;background:rgba(3,7,16,.86);border:1px solid rgba(158,203,245,.17);box-shadow:0 30px 100px rgba(0,0,0,.5);overflow:hidden}.experiment-close{position:absolute;right:18px;top:16px;z-index:4;width:36px;height:36px;border-radius:50%;background:rgba(10,18,33,.65);border:1px solid rgba(160,204,247,.2);cursor:pointer}.experiment-head{grid-column:2;grid-row:1;padding:32px 26px 12px;border-left:1px solid rgba(157,202,245,.12)}.experiment-head h2{font-size:30px;font-weight:360;margin:0 0 8px}.experiment-head p:not(.panel-kicker){font-size:12px;color:#9eb4cc;line-height:1.5;margin:0}.experiment-stage{grid-column:1;grid-row:1/3;position:relative;min-width:0;background:radial-gradient(circle at center,#071222,#01040a)}#experimentCanvas{width:100%;height:100%;display:block}.experiment-annotation{position:absolute;left:22px;bottom:22px;padding:9px 12px;background:rgba(3,9,18,.52);border-left:1px solid rgba(126,205,255,.42);font-size:10px;letter-spacing:.08em;color:#a9c3df;max-width:420px}.experiment-controls{grid-column:2;grid-row:2;padding:10px 26px 28px;border-left:1px solid rgba(157,202,245,.12);overflow:auto}.control-block{padding:14px 0;border-top:1px solid rgba(158,202,244,.1)}.control-block label{display:flex;justify-content:space-between;font-size:10px;color:#adbed2;letter-spacing:.06em}.control-block output{color:#eef7ff}.control-block input[type=range]{width:100%;margin:12px 0 2px;accent-color:#8acaff}.experiment-equation{margin-top:16px;padding:14px;border:1px solid rgba(153,202,247,.13);background:rgba(7,15,29,.5);font-family:Georgia,serif;font-style:italic;font-size:18px}.experiment-note{font-size:11px;color:#8fa7c0;line-height:1.55;margin:12px 0}.experiment-button{width:100%;min-height:40px;border:1px solid rgba(147,202,253,.3);background:rgba(98,164,228,.12);cursor:pointer;letter-spacing:.12em;font-size:9px}
.discovery-overlay{background:rgba(1,4,10,.2);backdrop-filter:blur(4px)}.discovery-card{width:min(440px,86vw);padding:28px;background:rgba(4,11,24,.78);border:1px solid rgba(162,209,255,.24);box-shadow:0 20px 100px rgba(0,0,0,.4)}.discovery-card small{font-size:8px;letter-spacing:.22em;color:#7bdcff}.discovery-card h2{font-size:34px;font-weight:350;margin:8px 0}.discovery-card p{color:#a9bed4;line-height:1.6}.discovery-card button{margin-top:12px;border:1px solid rgba(149,202,251,.28);background:rgba(113,175,235,.12);padding:11px 14px;cursor:pointer;font-size:9px;letter-spacing:.15em}
.controls-overlay{background:rgba(1,4,10,.68);backdrop-filter:blur(18px)}.controls-card{position:relative;width:min(760px,90vw);padding:30px;background:rgba(4,10,21,.86);border:1px solid rgba(162,207,250,.19)}.controls-card>button{position:absolute;right:16px;top:14px;border:0;background:none;font-size:25px;color:#8aa0b8;cursor:pointer}.controls-card h2{font-weight:350;font-size:31px;margin:4px 0 24px}.control-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.control-grid div{display:flex;align-items:center;gap:12px;border-top:1px solid rgba(155,198,238,.1);padding:10px 0}.control-grid kbd{min-width:72px;color:#e9f5ff;font-size:10px}.control-grid span{font-size:11px;color:#9db2ca}.controls-note{font-size:11px;color:#7f96af;margin:18px 0 0}
.toast-stack{position:absolute;z-index:50;left:50%;top:18%;transform:translateX(-50%);display:grid;gap:7px;pointer-events:none}.toast{padding:8px 13px;background:rgba(4,10,22,.74);border:1px solid rgba(151,204,253,.19);backdrop-filter:blur(10px);font-size:10px;letter-spacing:.05em;animation:toastIn .3s ease both}@keyframes toastIn{from{opacity:0;transform:translateY(-7px)}}

body.physics-hidden .physics-panel{opacity:0;pointer-events:none;transform:translate(15px,-47%)}
body.motion-reduced *,body.motion-reduced *::before,body.motion-reduced *::after{animation-duration:.001ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.08s!important}

@media(max-width:900px){.hud-top{grid-template-columns:1fr auto}.hud-center{display:none}.target-panel{left:16px;top:auto;bottom:115px;transform:none;width:min(410px,calc(100vw - 32px));background:rgba(4,10,22,.65)}.physics-panel{display:none}.scale-rail{width:calc(100vw - 32px);bottom:22px}.scale-copy{bottom:23px}.rail-track{margin-left:110px}.nav-compass{display:none}.mission-hud{top:80px;max-width:calc(100vw - 30px)}.intro-copy{left:7vw;width:86vw}.intro h1{font-size:clamp(42px,12vw,78px)}.experiment-shell{inset:2vh 2vw;display:flex;flex-direction:column}.experiment-stage{min-height:46vh;flex:1}.experiment-head{border-left:0;padding:22px 20px 10px}.experiment-controls{border-left:0;padding:8px 20px 22px;max-height:36vh}.control-grid{grid-template-columns:1fr}}
@media(max-width:600px){.intro-copy{top:53%}.intro-lede{font-size:15px}.intro-hint{display:none}.enter-button,.ghost-button{width:100%;justify-content:space-between}.hud-top{padding-left:16px;padding-right:16px}.identity small{max-width:140px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.target-panel{bottom:99px}.target-panel>p:not(.panel-kicker){display:none}.target-metrics{display:none}.panel-actions{margin-top:9px}.scale-copy{display:none}.rail-track{margin-left:0}.rail-instruction{display:none}.mission-hud{display:none}}