:root{
  --bg:#08070d; --bg2:#14070b; --panel:rgba(255,255,255,.08); --panel2:rgba(255,255,255,.13);
  --text:#fff; --muted:rgba(255,255,255,.72); --line:rgba(255,255,255,.14);
  --red:#f20b0b; --red2:#ff4242; --green:#65e687; --yellow:#ffd166; --shadow:0 24px 70px rgba(0,0,0,.45);
  --radius:28px;
}
body.light{
  --bg:#f8f7fb; --bg2:#fff; --panel:rgba(255,255,255,.82); --panel2:rgba(255,255,255,.96);
  --text:#16151d; --muted:rgba(20,20,30,.68); --line:rgba(15,15,25,.14); --shadow:0 20px 55px rgba(35,35,50,.16);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;user-select:none}
html,body{margin:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--text);overflow-x:hidden}
body{
  background: radial-gradient(circle at 12% 8%, rgba(242,11,11,.45), transparent 30%), radial-gradient(circle at 85% 10%, rgba(255,91,91,.18), transparent 28%), linear-gradient(135deg,var(--bg),var(--bg2));
  transition:background .25s,color .25s;
}
.stars{position:fixed;inset:0;pointer-events:none;opacity:.32;background-image:radial-gradient(#fff 1px,transparent 1px),radial-gradient(#fff 1px,transparent 1px);background-size:72px 72px,123px 123px;background-position:0 0,30px 55px;mask-image:radial-gradient(circle at center,#000,transparent 82%)}
.app{position:relative;min-height:100vh;width:min(1260px,100%);margin:0 auto;padding:14px;display:flex;flex-direction:column;gap:12px}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;border:1px solid var(--line);background:linear-gradient(135deg,rgba(242,11,11,.34),var(--panel));border-radius:22px;box-shadow:var(--shadow);backdrop-filter:blur(14px)}
.brand-logo{width:min(210px,46vw);height:auto;display:block;filter:drop-shadow(0 10px 22px rgba(242,11,11,.32))}
.home-btn,.icon-btn,.primary,.secondary,.class-btn{border:1px solid var(--line);cursor:pointer;font:inherit;font-weight:950;color:var(--text);transition:transform .18s ease,filter .18s ease,background .18s ease;text-decoration:none}
.home-btn{min-height:42px;display:inline-flex;align-items:center;padding:0 16px;border-radius:999px;background:rgba(255,255,255,.1);white-space:nowrap}
.top-actions{display:flex;gap:8px}.icon-btn{width:46px;height:46px;border-radius:16px;background:var(--panel2);font-size:18px}.home-btn:hover,.icon-btn:hover,.primary:hover,.secondary:hover,.class-btn:hover{transform:translateY(-2px);filter:brightness(1.08)}
.screen{display:none}.screen.active{display:block}.hero-card,.result-card{border:1px solid var(--line);background:linear-gradient(135deg,rgba(242,11,11,.18),var(--panel));box-shadow:var(--shadow);border-radius:var(--radius);padding:clamp(18px,4vw,42px);overflow:hidden}.hero-card{display:grid;grid-template-columns:1fr 1.1fr;gap:24px;align-items:center;min-height:calc(100vh - 105px)}
.hero-left{display:flex;align-items:center;gap:18px}.hero-mark{width:clamp(84px,15vw,150px);filter:drop-shadow(0 16px 36px rgba(242,11,11,.3))}.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 8px;padding:8px 11px;border-radius:999px;background:rgba(242,11,11,.9);color:#fff;font-size:12px;text-transform:uppercase;letter-spacing:.12em;font-weight:1000}.eyebrow.small{font-size:10px;margin:0 0 5px}h1{margin:0;font-size:clamp(38px,7vw,76px);line-height:.95;letter-spacing:-.06em}h2,h3,p{margin:0}.subtext{margin-top:12px;color:var(--muted);font-size:clamp(15px,2vw,20px);line-height:1.5;font-weight:700}.class-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.class-btn{min-height:76px;border-radius:22px;background:linear-gradient(135deg,#ff3939,#870101);color:#fff;box-shadow:0 12px 26px rgba(242,11,11,.25);font-size:22px}.class-btn span{display:block;font-size:11px;letter-spacing:.1em;text-transform:uppercase;opacity:.82}
.hud-panel{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:12px}.hud-panel>div{padding:12px 14px;border:1px solid var(--line);border-radius:18px;background:var(--panel);box-shadow:0 12px 36px rgba(0,0,0,.17)}.hud-panel span,.result-stats span{display:block;color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.12em;font-weight:950}.hud-panel strong,.result-stats strong{font-size:24px}.game-layout{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(340px,.75fr);gap:12px;align-items:stretch}.space-card,.question-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);box-shadow:var(--shadow);overflow:hidden}.space-card{padding:14px;display:flex;flex-direction:column;min-height:calc(100vh - 170px)}.space-topline{display:flex;align-items:center;justify-content:space-between;gap:10px}.space-topline h2{font-size:clamp(22px,3vw,36px);letter-spacing:-.04em}.timer{min-width:80px;text-align:center;border:1px solid var(--line);border-radius:20px;background:var(--panel2);padding:10px}.timer strong{display:block;font-size:32px}.timer span{font-size:12px;color:var(--muted);font-weight:950}.orbit-zone{position:relative;flex:1;min-height:430px;border-radius:24px;margin-top:10px;overflow:hidden;background:radial-gradient(circle at center,rgba(255,255,255,.09),rgba(0,0,0,.24) 60%,rgba(0,0,0,.55));border:1px solid var(--line);touch-action:none}#solarCanvas{width:100%;height:100%;display:block}.planet-tooltip{position:absolute;left:12px;bottom:12px;padding:10px 12px;border-radius:999px;background:rgba(0,0,0,.55);border:1px solid rgba(255,255,255,.18);color:#fff;font-weight:900;font-size:13px}.orbit-help{padding:10px 4px 0;color:var(--muted);font-size:13px;font-weight:800;text-align:center}.question-card{padding:14px;display:flex;flex-direction:column;gap:12px}.planet-info{display:flex;gap:12px;align-items:center;border:1px solid var(--line);background:var(--panel2);border-radius:22px;padding:12px}.planet-dot{width:48px;height:48px;border-radius:50%;background:#ffcc33;box-shadow:0 0 25px currentColor}.planet-info h3{font-size:22px}.planet-info p{color:var(--muted);line-height:1.35;font-weight:700;font-size:14px}.question-box{border:1px solid var(--line);border-radius:24px;padding:14px;background:linear-gradient(135deg,rgba(255,255,255,.09),rgba(242,11,11,.08))}.question-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;font-weight:1000;text-transform:uppercase;letter-spacing:.1em}.question-box h2{margin:12px 0;font-size:clamp(22px,3vw,34px);line-height:1.12;letter-spacing:-.035em}.options{display:grid;grid-template-columns:1fr;gap:9px}.option-btn{min-height:50px;text-align:left;border:1px solid var(--line);border-radius:16px;background:var(--panel2);color:var(--text);font:inherit;font-size:16px;font-weight:950;padding:10px 14px;cursor:pointer}.option-btn.correct{background:linear-gradient(135deg,#1ca14b,#65e687);color:#06110a}.option-btn.wrong{background:linear-gradient(135deg,#c90202,#ff4444);color:#fff}.option-btn:disabled{cursor:default}.feedback{min-height:42px;border-radius:16px;padding:11px 12px;background:var(--panel2);border:1px solid var(--line);font-weight:900;color:var(--muted)}.button-row{display:grid;grid-template-columns:1fr 1.5fr;gap:10px;margin-top:auto}.button-row.center{display:flex;justify-content:center;flex-wrap:wrap}.primary,.secondary{min-height:52px;border-radius:999px;padding:0 18px}.primary{background:linear-gradient(135deg,#ff3a3a,#c40000);color:#fff;box-shadow:0 12px 26px rgba(242,11,11,.25)}.secondary{background:var(--panel2)}.result-card{text-align:center;max-width:760px;margin:34px auto}.result-mark{width:120px;filter:drop-shadow(0 18px 34px rgba(242,11,11,.3))}.result-card h2{font-size:clamp(38px,7vw,70px);letter-spacing:-.06em}.result-card p{color:var(--muted);font-weight:800}.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:18px 0}.result-stats>div{border:1px solid var(--line);background:var(--panel2);border-radius:18px;padding:14px}
@media(max-width:980px){.hero-card{grid-template-columns:1fr}.game-layout{grid-template-columns:1fr}.space-card{min-height:auto}.orbit-zone{height:52vh;min-height:360px}.question-card{min-height:auto}.class-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:640px){.app{padding:8px;gap:8px}.topbar{padding:8px;border-radius:18px}.brand-logo{width:min(156px,42vw)}.home-btn{min-height:38px;padding:0 12px;font-size:13px}.icon-btn{width:40px;height:40px}.hero-card{min-height:calc(100vh - 82px);padding:14px}.hero-left{flex-direction:column;text-align:center}.class-grid{grid-template-columns:repeat(2,1fr);gap:9px}.class-btn{min-height:62px}.hud-panel{grid-template-columns:repeat(4,1fr);gap:6px}.hud-panel>div{padding:8px 7px;border-radius:14px}.hud-panel span{font-size:9px}.hud-panel strong{font-size:18px}.space-card,.question-card{padding:9px;border-radius:20px}.space-topline h2{font-size:20px}.timer{min-width:64px;padding:7px;border-radius:16px}.timer strong{font-size:24px}.orbit-zone{height:38vh;min-height:280px;margin-top:7px}.orbit-help{font-size:11px}.planet-info{padding:9px;border-radius:18px}.planet-dot{width:38px;height:38px}.planet-info h3{font-size:18px}.planet-info p{font-size:12px}.question-box{padding:11px;border-radius:18px}.question-box h2{font-size:22px;margin:8px 0}.option-btn{min-height:44px;font-size:14px}.button-row{grid-template-columns:1fr 1fr}.primary,.secondary{min-height:46px}.result-stats{grid-template-columns:1fr}}
@media(max-width:430px){.orbit-zone{height:34vh;min-height:245px}.hud-panel{grid-template-columns:repeat(2,1fr)}.question-card{gap:8px}.feedback{min-height:36px;padding:9px;font-size:13px}}
@media(orientation:landscape) and (max-height:620px){.game-layout{grid-template-columns:1.1fr .9fr}.orbit-zone{height:58vh;min-height:260px}.space-card{min-height:auto}.hud-panel>div{padding:8px 10px}.question-box h2{font-size:22px}.option-btn{min-height:40px}.topbar{padding:7px 10px}.brand-logo{width:160px}}
.question-box h2{word-break:normal;overflow-wrap:break-word}.option-btn{touch-action:manipulation}.feedback{overflow-wrap:break-word}
@media(max-width:640px){.question-box h2{font-size:20px;line-height:1.18}.options{gap:7px}.option-btn{min-height:42px}.orbit-help{display:none}.planet-tooltip{font-size:11px;max-width:calc(100% - 24px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.space-card{padding-bottom:6px}.question-card{padding-top:8px}}