:root{--bg:#03050d;--panel:rgba(8,13,29,.78);--panel-solid:#0a1021;--accent:#8d72ff;--cyan:#58dcff;--line:rgba(255,255,255,.1);--text:#f5f7ff;--muted:#929db8;--shadow:0 24px 70px rgba(0,0,0,.5)}
*{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;min-height:100%;overflow:hidden;overscroll-behavior:none}body{min-height:100dvh;font-family:"Manrope","Segoe UI",sans-serif;background:radial-gradient(circle at 50% 45%,#10162d,#03050d 60%);color:var(--text);-webkit-tap-highlight-color:transparent}button{font:inherit}button:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}.hidden{opacity:0!important;pointer-events:none!important;visibility:hidden}
#solarSystem{display:block;width:100vw;height:100vh;height:100dvh;cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none}.hud{position:fixed;z-index:10}
.hud-top{top:22px;left:24px;display:flex;align-items:center;gap:13px}.brand-mark{position:relative;width:42px;height:42px;border:1px solid rgba(130,215,255,.3);border-radius:13px;background:linear-gradient(145deg,rgba(124,92,255,.24),rgba(0,212,255,.08));box-shadow:inset 0 0 20px rgba(99,114,255,.15);display:grid;place-items:center}.brand-mark:before,.brand-mark:after,.brand-mark span{content:"";position:absolute;border:1px solid #9ce9ff;border-radius:50%;width:22px;height:8px;transform:rotate(35deg)}.brand-mark:after{transform:rotate(-35deg)}.brand-mark span{width:6px;height:6px;background:#fff;border:0;box-shadow:0 0 12px #7de5ff}
.eyebrow,.chapter,.section-label,.nav-title,.quiz-kicker{font-size:9px;text-transform:uppercase;letter-spacing:1.7px;font-weight:800;color:#7f8eac}.hud-top h1{font:700 22px/1.15 "Space Grotesk",sans-serif;letter-spacing:-.4px}.grad{background:linear-gradient(90deg,#ad91ff,#5ce4ff);background-clip:text;-webkit-background-clip:text;color:transparent}
.planet-nav{top:50%;left:24px;transform:translateY(-50%);padding:12px 8px;background:rgba(6,10,23,.58);border:1px solid var(--line);border-radius:18px;backdrop-filter:blur(16px);box-shadow:var(--shadow)}.nav-title{padding:2px 10px 9px}.planet-nav button{width:142px;height:33px;display:flex;align-items:center;gap:9px;border:0;border-radius:10px;padding:0 9px;background:transparent;color:#9ca8c1;font-size:11px;font-weight:600;cursor:pointer;transition:.2s}.planet-nav button:hover,.planet-nav button.active{color:#fff;background:rgba(255,255,255,.09)}.planet-nav button.active{box-shadow:inset 2px 0 0 var(--planet-color)}.nav-dot{width:9px;height:9px;border-radius:50%;background:var(--planet-color);box-shadow:0 0 9px var(--planet-color)}.nav-order{margin-left:auto;font-size:8px;color:#64708b}
.model-note{top:24px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:8px;color:#7f8aa4;font-size:10px}.model-note span{width:17px;height:17px;border:1px solid #5f6c89;border-radius:50%;display:grid;place-items:center;font-size:10px}
.hint{right:24px;bottom:25px;display:flex;align-items:center;gap:5px;color:#7f8aa4;font-size:10px;padding:9px 13px;background:rgba(8,13,29,.54);border:1px solid var(--line);border-radius:99px;backdrop-filter:blur(12px)}.mouse-icon{color:#80ddff}.touch-help{display:none}
.controls{left:50%;bottom:22px;transform:translateX(-50%);display:flex;align-items:center;gap:8px;padding:7px 10px;background:var(--panel);border:1px solid var(--line);border-radius:16px;backdrop-filter:blur(18px);box-shadow:var(--shadow)}.ctl{border:1px solid transparent;background:rgba(255,255,255,.055);color:#dbe2f2;border-radius:10px;padding:7px 11px;font-size:11px;font-weight:700;cursor:pointer;transition:.2s}.ctl:hover{background:rgba(255,255,255,.13);transform:translateY(-1px)}.ctl.icon{width:35px;height:35px;padding:0;color:#86e2ff}.speed-group{display:flex;gap:2px}.speed{background:transparent;color:#7f8aa4}.speed.active{color:#06101a;background:linear-gradient(135deg,#a18aff,#62e7ff);box-shadow:0 5px 18px rgba(92,211,255,.18)}.divider{height:24px;width:1px;background:var(--line)}.readout{min-width:104px;display:flex;flex-direction:column;padding:0 5px}.readout .label{font-size:8px;text-transform:uppercase;letter-spacing:1.2px;color:#69748e}.readout strong{font-size:11px;font-variant-numeric:tabular-nums}.overview{border-color:rgba(100,214,255,.2);color:#8de3ff}
.planet-info{--accent:#7c5cff;position:fixed;z-index:20;right:22px;top:18px;bottom:18px;width:360px;overflow:auto;padding:25px;background:linear-gradient(155deg,rgba(14,21,43,.96),rgba(5,9,21,.95));border:1px solid rgba(255,255,255,.11);border-radius:24px;backdrop-filter:blur(22px);box-shadow:var(--shadow);transition:opacity .3s,transform .35s,visibility .3s}.planet-info:before{content:"";position:absolute;left:22px;right:22px;top:0;height:2px;background:linear-gradient(90deg,transparent,var(--accent),transparent)}.planet-info.hidden{transform:translateX(35px)}.planet-info::-webkit-scrollbar{width:5px}.planet-info::-webkit-scrollbar-thumb{background:rgba(255,255,255,.15);border-radius:4px}.close{position:absolute;right:14px;top:14px;width:33px;height:33px;border:1px solid var(--line);border-radius:11px;background:rgba(255,255,255,.05);color:#b5bfd3;font-size:20px;cursor:pointer}.close:hover{color:#fff;background:rgba(255,255,255,.12)}
.info-head{display:flex;align-items:center;gap:14px;padding-right:28px;margin-bottom:16px}.swatch{width:52px;height:52px;flex:none;border-radius:50%;box-shadow:0 0 28px color-mix(in srgb,var(--accent),transparent 55%),inset -9px -8px 15px rgba(0,0,0,.38)}.chapter{color:var(--accent)}.planet-info h2{font:700 26px/1.12 "Space Grotesk",sans-serif;margin:2px 0 4px}.badge{font-size:9px;color:#8d99b4;border:1px solid var(--line);border-radius:99px;padding:3px 8px;text-transform:uppercase;letter-spacing:.8px}.lead{font-size:12.5px;line-height:1.7;color:#b9c4d9}.focus-btn{width:100%;margin:16px 0 22px;padding:11px;border:1px solid color-mix(in srgb,var(--accent),transparent 55%);border-radius:12px;background:linear-gradient(120deg,color-mix(in srgb,var(--accent),transparent 77%),rgba(88,220,255,.09));color:#eef2ff;font-size:11px;font-weight:800;cursor:pointer}.focus-btn:hover{border-color:var(--accent);box-shadow:0 8px 25px color-mix(in srgb,var(--accent),transparent 83%)}.section-label{margin:17px 0 9px;color:#7886a3}.fact-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px}.fact{min-height:58px;padding:9px 10px;background:rgba(255,255,255,.035);border:1px solid rgba(255,255,255,.065);border-radius:10px}.fact span{display:block;color:#6f7b96;font-size:9px;margin-bottom:4px}.fact strong{font-size:11px;line-height:1.25}.composition{height:5px;background:rgba(255,255,255,.07);border-radius:9px;overflow:hidden}.composition div{width:100%;height:100%;background:linear-gradient(90deg,var(--accent),#60ddff);border-radius:inherit}.small-copy{font-size:10.5px;line-height:1.55;color:#8e9ab3;margin-top:7px}.fun-fact{display:flex;gap:10px;margin-top:17px;padding:13px;border:1px solid color-mix(in srgb,var(--accent),transparent 74%);background:color-mix(in srgb,var(--accent),transparent 91%);border-radius:13px}.fun-fact>span{color:var(--accent);font-size:17px}.fun-fact strong{font-size:10px;color:#e9edfa}.fun-fact p{font-size:10.5px;line-height:1.5;color:#aeb9cf;margin-top:3px}.earth-lesson>p{font-size:10.5px;color:#8e9ab3;line-height:1.5}.continent-list{display:flex;flex-wrap:wrap;gap:5px;margin-top:9px}.continent-list span{font-size:9px;padding:4px 7px;border-radius:7px;background:rgba(61,165,105,.12);border:1px solid rgba(89,213,139,.18);color:#8ad8aa}
.quiz-card{margin-top:12px;padding:14px;background:rgba(0,0,0,.19);border:1px solid var(--line);border-radius:14px}.quiz-kicker{display:block;color:#6dddfd;margin-bottom:5px}.quiz-card>strong{font-size:11px;line-height:1.4}.quiz-answers{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:10px}.quiz-answers button{padding:7px;border:1px solid var(--line);border-radius:8px;background:rgba(255,255,255,.04);color:#aeb8ce;font-size:9.5px;cursor:pointer}.quiz-answers button:hover{border-color:#69dfff;color:#fff}.quiz-answers button.correct{border-color:#5ce39a;background:rgba(44,207,123,.14);color:#92efbc}.quiz-answers button.wrong{border-color:#ff7083;background:rgba(255,86,111,.13);color:#ff9dac}.quiz-feedback{min-height:14px;margin-top:7px;font-size:9px;color:#8ce8b6}
.earth-lesson.hidden{display:none}.texture-credit{margin-top:10px;padding-top:8px;border-top:1px solid rgba(255,255,255,.06);font-size:8.5px;line-height:1.45;color:#56627b}
.focus-label{left:50%;top:25px;transform:translateX(-50%);text-align:center;transition:.3s}.focus-label>span{display:block;color:#63dfff;font-size:8px;text-transform:uppercase;letter-spacing:2px}.focus-label strong{display:block;font:600 16px/1.25 "Space Grotesk"}.focus-label small{display:block;color:#64708b;font-size:9px;line-height:1.4;margin-top:3px}.focus-label .touch-help{display:none}
@media(max-width:1024px){.planet-nav{left:max(12px,env(safe-area-inset-left))}.planet-nav button{width:44px;height:44px;padding:0;justify-content:center}.planet-nav button:not(.active) .nav-name,.nav-order{display:none}.planet-nav button.active{width:112px;padding:0 10px}.model-note{display:none}.planet-info{right:max(12px,env(safe-area-inset-right));width:min(350px,44vw);padding:22px}.ctl,.focus-btn,.quiz-answers button{min-height:44px}.close{width:44px;height:44px;right:10px;top:10px}}
@media(max-width:650px){.hud-top{top:max(10px,env(safe-area-inset-top));left:max(10px,env(safe-area-inset-left))}.hud-top h1{font-size:17px}.brand-mark{width:36px;height:36px}.eyebrow{font-size:7px}.planet-nav{top:calc(max(10px,env(safe-area-inset-top)) + 52px);left:max(8px,env(safe-area-inset-left));right:max(8px,env(safe-area-inset-right));transform:none;padding:5px;overflow-x:auto;overflow-y:hidden;scrollbar-width:none}.planet-nav::-webkit-scrollbar{display:none}.planet-nav .nav-title{display:none}.planet-nav #planetNav{display:flex;justify-content:space-between;min-width:max-content}.planet-nav button,.planet-nav button.active{width:44px;min-width:44px;height:44px;padding:0;justify-content:center}.planet-nav .nav-name,.nav-order{display:none!important}.planet-info{top:auto;left:max(8px,env(safe-area-inset-left));right:max(8px,env(safe-area-inset-right));bottom:calc(68px + env(safe-area-inset-bottom));width:auto;max-height:min(61dvh,620px);padding:20px 18px calc(20px + env(safe-area-inset-bottom));border-radius:20px;overscroll-behavior:contain}.planet-info.hidden{transform:translateY(35px)}.controls{left:max(8px,env(safe-area-inset-left));right:max(8px,env(safe-area-inset-right));bottom:max(8px,env(safe-area-inset-bottom));width:auto;transform:none;gap:5px;padding:5px 6px}.ctl{min-width:42px;padding:8px}.speed-group{gap:1px}.speed{width:40px}.hint{display:none}.readout{min-width:68px;padding:0 3px}.readout .label{display:none}.overview{margin-left:auto;white-space:nowrap}.focus-label{top:calc(max(10px,env(safe-area-inset-top)) + 108px);max-width:calc(100vw - 24px)}.focus-label small{font-size:8px}.fact{min-height:58px}.lead{font-size:13px}.quiz-answers button{font-size:10px}.info-head{padding-right:38px}}
@media(max-width:390px){.hud-top .eyebrow{display:none}.planet-nav{top:56px}.focus-label{top:108px}.controls .divider,.controls .readout{display:none}.controls{justify-content:flex-start}.overview{margin-left:auto}.planet-info{max-height:64dvh}.fact-grid{gap:6px}.fact{padding:9px 8px}.planet-info h2{font-size:24px}}
@media(max-height:500px) and (orientation:landscape) and (pointer:coarse){.hud-top{display:none}.planet-nav{top:max(6px,env(safe-area-inset-top));left:max(6px,env(safe-area-inset-left));right:auto;bottom:max(6px,env(safe-area-inset-bottom));width:54px;padding:4px;overflow-x:hidden;overflow-y:auto;transform:none}.planet-nav .nav-title{display:none}.planet-nav #planetNav{display:flex;min-width:0;flex-direction:column}.planet-nav button,.planet-nav button.active{min-width:44px;width:44px;height:42px;padding:0}.planet-nav .nav-name,.nav-order{display:none!important}.focus-label{top:max(8px,env(safe-area-inset-top));left:42%}.planet-info{top:max(6px,env(safe-area-inset-top));right:max(6px,env(safe-area-inset-right));bottom:max(6px,env(safe-area-inset-bottom));left:auto;width:min(43vw,350px);max-height:none;padding:16px}.controls{left:68px;right:auto;bottom:max(6px,env(safe-area-inset-bottom));width:auto;transform:none}.controls .readout,.controls .divider{display:none}.hint{display:none}.fact{min-height:50px}.focus-btn{margin:10px 0 14px}.section-label{margin:12px 0 7px}}
@media(pointer:coarse){button{touch-action:manipulation}.mouse-help,.focus-label .mouse-help{display:none}.touch-help,.focus-label .touch-help{display:inline}.planet-nav button:hover,.ctl:hover,.close:hover{transform:none}.planet-info{-webkit-overflow-scrolling:touch}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}