:root{
  --bg:#f4f8ff;--bg2:#ecf5ff;--panel:#ffffff;--panel-glass:rgba(255,255,255,.88);--panel-soft:#f0f6ff;
  --text:#17213a;--muted:#64748b;--primary:#4f46e5;--primary2:#06b6d4;--pink:#ec4899;--green:#10b981;
  --yellow:#f59e0b;--red:#ef4444;--purple:#8b5cf6;--line:rgba(23,33,58,.12);--line-strong:rgba(79,70,229,.25);
  --shadow:0 22px 65px rgba(45,71,110,.13);--shadow-sm:0 9px 28px rgba(45,71,110,.10);
  --canvas:#f9fbff;--grid:rgba(79,70,229,.065);--topbar:rgba(255,255,255,.84);
}
[data-theme="dark"]{
  --bg:#07101d;--bg2:#0a192b;--panel:#0e1b2e;--panel-glass:rgba(14,27,46,.89);--panel-soft:#11243d;
  --text:#edf6ff;--muted:#9fb3c8;--primary:#818cf8;--primary2:#22d3ee;--pink:#f472b6;--green:#34d399;
  --yellow:#fbbf24;--red:#fb7185;--purple:#a78bfa;--line:rgba(255,255,255,.105);--line-strong:rgba(129,140,248,.33);
  --shadow:0 24px 70px rgba(0,0,0,.38);--shadow-sm:0 10px 30px rgba(0,0,0,.27);
  --canvas:#081625;--grid:rgba(129,140,248,.07);--topbar:rgba(9,21,36,.84);
}
[hidden]{display:none!important}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:radial-gradient(circle at 10% 0%,color-mix(in srgb,var(--primary) 14%,transparent),transparent 27%),radial-gradient(circle at 92% 8%,color-mix(in srgb,var(--primary2) 13%,transparent),transparent 26%),linear-gradient(155deg,var(--bg),var(--bg2) 48%,var(--bg));transition:background .25s,color .25s}body.reduce-motion *,body.reduce-motion *::before,body.reduce-motion *::after{animation-duration:.001ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.001ms!important}button,input,select{font:inherit}button{cursor:pointer}a{color:inherit}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 52%,transparent);outline-offset:2px}.shell{width:min(1320px,calc(100% - 28px));margin:0 auto;padding:20px 0 72px}.topbar-wrap{position:sticky;top:0;z-index:80;padding:10px 14px 0;pointer-events:none}.topbar{width:min(1320px,100%);margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:11px 13px;border:1px solid var(--line);border-radius:20px;background:var(--topbar);backdrop-filter:blur(18px);box-shadow:var(--shadow-sm);pointer-events:auto}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;min-width:205px}.brand-mark{width:43px;height:43px;border-radius:14px;display:grid;place-items:center;color:#fff;font-weight:950;background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 9px 24px color-mix(in srgb,var(--primary) 28%,transparent)}.brand strong{display:block;font-size:1.03rem}.brand small{display:block;color:var(--muted);font-size:.72rem;margin-top:2px}.nav-links{display:flex;align-items:center;justify-content:center;gap:4px;flex-wrap:wrap}.nav-links a{text-decoration:none;color:var(--muted);font-size:.81rem;font-weight:750;padding:8px 9px;border-radius:10px}.nav-links a:hover{color:var(--text);background:var(--panel-soft)}.top-actions{display:flex;align-items:center;justify-content:flex-end;gap:7px}.xp-pill,.level-pill{border:1px solid var(--line);background:var(--panel-soft);padding:8px 10px;border-radius:999px;font-size:.78rem;white-space:nowrap}.icon-btn{width:39px;height:39px;border:1px solid var(--line);border-radius:12px;display:grid;place-items:center;color:var(--text);background:var(--panel-soft);transition:.18s}.icon-btn:hover{transform:translateY(-2px);border-color:var(--line-strong)}.hero{display:grid;grid-template-columns:1.12fr .88fr;align-items:center;gap:34px;padding:68px 12px 38px}.eyebrow{display:inline-block;color:var(--primary);font-size:.77rem;font-weight:900;letter-spacing:.14em;text-transform:uppercase}.hero h1{margin:13px 0 18px;font-size:clamp(2.7rem,6vw,5.8rem);line-height:.94;letter-spacing:-.06em;max-width:810px}.hero h1 span{background:linear-gradient(90deg,var(--primary),var(--primary2),var(--pink));-webkit-background-clip:text;background-clip:text;color:transparent}.hero-copy>p{margin:0;color:var(--muted);font-size:1.08rem;line-height:1.76;max-width:760px}.hero-actions{display:flex;gap:11px;flex-wrap:wrap;margin-top:25px}.btn{border:1px solid var(--line);border-radius:13px;padding:11px 15px;color:var(--text);background:var(--panel);font-weight:850;transition:.18s;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:7px}.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}.btn.primary{color:#fff;border-color:transparent;background:linear-gradient(135deg,var(--primary),var(--primary2))}.btn.secondary{background:var(--panel-soft)}.btn.cheerful{color:#fff;border:0;background:linear-gradient(135deg,var(--pink),var(--purple))}.btn.danger{color:var(--red);background:color-mix(in srgb,var(--red) 8%,var(--panel));border-color:color-mix(in srgb,var(--red) 25%,var(--line))}.btn.tiny{padding:7px 10px;font-size:.76rem;border-radius:10px}.btn.full{width:100%}.daily-challenge{margin-top:24px;display:grid;grid-template-columns:auto 1fr auto;gap:11px;align-items:center;max-width:660px;padding:12px 13px;border:1px solid color-mix(in srgb,var(--yellow) 32%,var(--line));border-radius:15px;background:color-mix(in srgb,var(--yellow) 8%,var(--panel-glass));box-shadow:var(--shadow-sm)}.daily-icon{width:39px;height:39px;border-radius:12px;display:grid;place-items:center;background:color-mix(in srgb,var(--yellow) 17%,var(--panel))}.daily-challenge small{display:block;color:var(--muted);font-size:.7rem;text-transform:uppercase;letter-spacing:.08em}.daily-challenge strong{display:block;margin-top:3px;font-size:.9rem}.hero-world{min-height:365px;position:relative;display:grid;place-items:center;overflow:hidden}.hero-planet{width:112px;height:112px;border-radius:50%;display:grid;place-items:center;background:radial-gradient(circle at 32% 26%,#dffaff,var(--primary2) 28%,var(--primary) 64%,#312e81);box-shadow:0 0 75px color-mix(in srgb,var(--primary) 44%,transparent);z-index:3}.planet-face{font-size:2.1rem;color:#fff;transform:rotate(3deg)}.hero-orbit{position:absolute;border:1px solid color-mix(in srgb,var(--primary) 27%,transparent);border-radius:50%;transform:rotate(var(--r));animation:orbit var(--s) linear infinite}.hero-orbit span{position:absolute;width:17px;height:17px;border-radius:50%;left:-8px;top:calc(50% - 8px);background:var(--yellow);box-shadow:0 0 20px color-mix(in srgb,var(--yellow) 62%,transparent)}.orbit-a{width:285px;height:124px;--r:12deg;--s:8s}.orbit-b{width:350px;height:150px;--r:72deg;--s:12s}.orbit-c{width:240px;height:105px;--r:137deg;--s:6.5s}@keyframes orbit{to{transform:rotate(calc(var(--r) + 360deg))}}.hero-rocket{position:absolute;right:10%;bottom:13%;font-size:2.4rem;animation:rocketBob 3s ease-in-out infinite}@keyframes rocketBob{50%{transform:translate(-8px,-14px) rotate(-7deg)}}.formula-chip{position:absolute;z-index:4;padding:8px 11px;border:1px solid var(--line);border-radius:12px;background:var(--panel-glass);box-shadow:var(--shadow-sm);color:var(--primary);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-weight:800;animation:floatChip 3.2s ease-in-out infinite}.chip-one{top:28px;left:10px}.chip-two{top:92px;right:10px;animation-delay:.5s}.chip-three{bottom:35px;left:42px;animation-delay:1s}.chip-four{right:52px;bottom:70px;animation-delay:1.5s}@keyframes floatChip{50%{transform:translateY(-7px)}}.progress-strip{display:grid;grid-template-columns:repeat(5,1fr);gap:11px;margin:5px 0 24px}.progress-strip article{padding:15px;border:1px solid var(--line);border-radius:17px;background:var(--panel-glass);box-shadow:var(--shadow-sm)}.progress-strip span{display:block;color:var(--muted);font-size:.72rem}.progress-strip strong{display:block;font-size:1.5rem;margin:4px 0}.progress-strip small{display:block;color:var(--muted);font-size:.72rem}.card,.card-soft{border:1px solid var(--line);background:var(--panel-glass);box-shadow:var(--shadow);border-radius:22px}.card-soft{box-shadow:var(--shadow-sm)}.mascot-tip{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:13px;padding:12px 14px}.mascot{width:51px;height:51px;border-radius:50%;display:grid;place-items:center;background:radial-gradient(circle at 35% 28%,#fff,var(--yellow) 35%,#f97316);box-shadow:0 0 30px color-mix(in srgb,var(--yellow) 40%,transparent);font-weight:900;color:#713f12}.mascot-tip small{color:var(--primary);font-weight:850}.mascot-tip p{margin:3px 0 0;color:var(--muted);line-height:1.5}.section{margin-top:34px;scroll-margin-top:92px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:18px;margin-bottom:16px;padding:0 2px}.section-heading h2{margin:6px 0 0;font-size:clamp(1.75rem,3vw,2.45rem);letter-spacing:-.035em}.section-heading h3{margin:0}.section-heading p{margin:7px 0 0;color:var(--muted);line-height:1.58;max-width:840px}.section-heading.compact{margin-top:26px}.section-actions{display:flex;gap:8px;flex-wrap:wrap}.confidence-key{display:flex;gap:7px;flex-wrap:wrap}.confidence{display:inline-flex;align-items:center;gap:5px;padding:6px 9px;border-radius:999px;border:1px solid var(--line);font-size:.71rem;font-weight:850;white-space:nowrap}.confidence.verified{color:var(--green);background:color-mix(in srgb,var(--green) 7%,var(--panel));border-color:color-mix(in srgb,var(--green) 30%,var(--line))}.confidence.simplified{color:var(--yellow);background:color-mix(in srgb,var(--yellow) 8%,var(--panel));border-color:color-mix(in srgb,var(--yellow) 31%,var(--line))}.confidence.theoretical{color:var(--purple);background:color-mix(in srgb,var(--purple) 8%,var(--panel));border-color:color-mix(in srgb,var(--purple) 31%,var(--line))}.lab-app{display:grid;grid-template-columns:300px 1fr;gap:17px;align-items:start}.lab-browser{position:sticky;top:85px;max-height:calc(100vh - 102px);overflow:hidden}.lab-browser-head{padding:13px;border-bottom:1px solid var(--line)}.search-box{display:flex;align-items:center;gap:8px;padding:10px 11px;border:1px solid var(--line);border-radius:12px;background:var(--panel-soft)}.search-box span{color:var(--muted);font-size:1.15rem}.search-box input{min-width:0;width:100%;border:0;outline:0;background:transparent;color:var(--text)}.search-box.large{min-width:min(470px,100%)}.lab-filter-row,.theory-filters{display:flex;gap:6px;flex-wrap:wrap;margin-top:10px}.filter-chip{border:1px solid var(--line);border-radius:999px;padding:6px 8px;background:var(--panel);color:var(--muted);font-size:.68rem;font-weight:750}.filter-chip.active{color:#fff;background:var(--primary);border-color:transparent}.lab-list{padding:9px;overflow:auto;max-height:calc(100vh - 207px)}.lab-item{width:100%;display:grid;grid-template-columns:38px 1fr auto;gap:9px;align-items:center;border:0;border-radius:13px;padding:9px;text-align:left;color:var(--text);background:transparent;margin-bottom:3px}.lab-item:hover{background:var(--panel-soft)}.lab-item.active{background:color-mix(in srgb,var(--primary) 10%,var(--panel));box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--primary) 28%,transparent)}.lab-item-icon{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:var(--panel-soft)}.lab-item.active .lab-item-icon{color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary2))}.lab-item strong{display:block;font-size:.81rem}.lab-item small{display:block;color:var(--muted);font-size:.65rem;margin-top:2px}.lab-item-fav{color:var(--pink)}.workspace{overflow:hidden}.workspace-head{padding:17px 18px;display:flex;justify-content:space-between;gap:13px;border-bottom:1px solid var(--line);background:linear-gradient(120deg,color-mix(in srgb,var(--primary) 7%,var(--panel)),color-mix(in srgb,var(--primary2) 5%,var(--panel)))}.workspace-title-wrap{display:flex;gap:12px;align-items:flex-start}.workspace-icon{width:51px;height:51px;flex:0 0 auto;border-radius:15px;display:grid;place-items:center;font-size:1.45rem;color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 9px 24px color-mix(in srgb,var(--primary) 23%,transparent)}.workspace-meta{display:flex;gap:8px;flex-wrap:wrap;color:var(--muted);font-size:.67rem;text-transform:uppercase;letter-spacing:.08em;font-weight:850}.workspace-meta span+span::before{content:"•";margin-right:8px}.workspace-head h3{margin:4px 0 4px;font-size:1.35rem}.workspace-head p{margin:0;color:var(--muted);line-height:1.45}.workspace-badges{display:flex;gap:7px;align-items:flex-start}.experiment-guide{display:flex;align-items:center;justify-content:center;gap:9px;padding:10px 18px;border-bottom:1px solid var(--line);background:var(--panel-soft);color:var(--muted);font-size:.72rem;font-weight:800}.experiment-guide span{display:flex;align-items:center;gap:5px}.experiment-guide b{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;color:#fff;background:var(--primary)}.experiment-guide i{width:30px;height:2px;background:var(--line-strong)}.workspace-grid{display:grid;grid-template-columns:285px 1fr;gap:14px;padding:16px}.control-panel{border:1px solid var(--line);border-radius:16px;padding:13px;background:var(--panel)}.panel-title{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:12px}.text-btn{border:0;background:transparent;color:var(--primary);font-size:.73rem;font-weight:850}.control-group{margin-bottom:13px}.control-label{display:flex;justify-content:space-between;gap:8px;margin-bottom:7px;font-size:.76rem}.control-label span{color:var(--muted)}.control-label strong{color:var(--primary);text-align:right}.control-group input[type="range"]{width:100%;accent-color:var(--primary)}.control-group select,.speed-select select{width:100%;border:1px solid var(--line);border-radius:10px;padding:9px;color:var(--text);background:var(--panel-soft)}.check-control{display:flex;align-items:center;gap:9px;padding:9px;border:1px solid var(--line);border-radius:11px;background:var(--panel-soft);font-size:.78rem}.check-control input{accent-color:var(--primary)}.simulation-actions{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:14px}.speed-select{grid-column:1/-1;color:var(--muted);font-size:.71rem;display:grid;grid-template-columns:auto 1fr;align-items:center;gap:8px}.speed-select select{padding:7px}.simulation-column{min-width:0}.canvas-shell{position:relative;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px),var(--canvas);background-size:24px 24px;min-height:420px}#labCanvas{display:block;width:100%;height:auto;aspect-ratio:15/8}.canvas-status{position:absolute;left:11px;top:11px;border:1px solid var(--line);border-radius:999px;padding:6px 9px;background:var(--panel-glass);color:var(--muted);font-size:.68rem;font-weight:800;backdrop-filter:blur(10px)}.canvas-fullscreen{position:absolute;right:10px;top:10px;width:35px;height:35px;border:1px solid var(--line);border-radius:10px;display:grid;place-items:center;color:var(--text);background:var(--panel-glass);backdrop-filter:blur(10px);font-size:1rem}.canvas-shell:fullscreen{width:100vw;height:100vh;border:0;border-radius:0;display:grid;place-items:center;background:var(--canvas)}.canvas-shell:fullscreen #labCanvas{width:min(100vw,187.5vh);height:auto}.canvas-shell:fullscreen .canvas-hint{bottom:18px;right:18px}.canvas-shell:fullscreen .canvas-status{left:18px;top:18px}.canvas-shell:fullscreen .canvas-fullscreen{right:18px;top:18px}.canvas-hint{position:absolute;right:10px;bottom:9px;color:var(--muted);font-size:.64rem;background:var(--panel-glass);padding:5px 7px;border-radius:8px}.readout-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-top:8px}.readout{padding:9px 10px;border:1px solid var(--line);border-radius:11px;background:var(--panel-soft);min-width:0}.readout span{display:block;color:var(--muted);font-size:.64rem}.readout strong{display:block;margin-top:3px;font-size:.88rem;overflow-wrap:anywhere}.learning-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:0 16px 15px}.prediction-card,.mission-card{border:1px solid var(--line);border-radius:15px;padding:13px;background:var(--panel)}.prediction-card{border-color:color-mix(in srgb,var(--primary2) 25%,var(--line));background:color-mix(in srgb,var(--primary2) 5%,var(--panel))}.mission-card{border-color:color-mix(in srgb,var(--yellow) 28%,var(--line));background:color-mix(in srgb,var(--yellow) 6%,var(--panel))}.mission-card.complete{border-color:color-mix(in srgb,var(--green) 40%,var(--line));background:color-mix(in srgb,var(--green) 7%,var(--panel))}.mini-label{color:var(--muted);font-size:.67rem;text-transform:uppercase;letter-spacing:.09em;font-weight:900}.prediction-card h4,.mission-card h4{margin:6px 0 8px}.prediction-options{display:flex;gap:6px;flex-wrap:wrap}.prediction-option{border:1px solid var(--line);border-radius:10px;padding:8px 9px;color:var(--text);background:var(--panel);font-size:.72rem}.prediction-option.selected{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 9%,var(--panel))}.prediction-option.correct{border-color:var(--green);background:color-mix(in srgb,var(--green) 9%,var(--panel))}.prediction-option.wrong{border-color:var(--red);background:color-mix(in srgb,var(--red) 8%,var(--panel))}.feedback{min-height:19px;margin:8px 0 0;color:var(--muted);font-size:.75rem;line-height:1.4}.mission-card p{margin:0;color:var(--muted);font-size:.78rem;line-height:1.45}.mission-bottom{display:flex;justify-content:space-between;gap:8px;margin-top:10px;font-size:.72rem}.mission-bottom span{color:var(--yellow);font-weight:900}.mission-bottom strong{color:var(--muted)}.explanation-tabs{display:flex;gap:6px;flex-wrap:wrap;padding:0 16px;border-top:1px solid var(--line);padding-top:14px}.explanation-tab{border:1px solid var(--line);border-radius:999px;padding:7px 10px;background:var(--panel);color:var(--muted);font-size:.72rem;font-weight:800}.explanation-tab.active{color:#fff;background:var(--primary);border-color:transparent}.explanation-panel{margin:10px 16px 0;padding:14px;border:1px solid var(--line);border-radius:14px;background:var(--panel-soft);color:var(--muted);line-height:1.62;font-size:.86rem;min-height:105px}.explanation-panel strong{color:var(--text)}.equation-box{margin-top:10px;padding:10px 12px;border:1px solid var(--line);border-radius:11px;background:var(--panel);color:var(--primary);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;overflow-x:auto}.observation-list{display:grid;grid-template-columns:repeat(2,1fr);gap:7px;margin-top:8px}.observation-list span{display:flex;gap:7px;align-items:flex-start;padding:8px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--muted)}.workspace-footer-actions{display:flex;gap:8px;flex-wrap:wrap;padding:13px 16px 17px}.theory-tools{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;padding:13px;margin-bottom:13px}.theory-filters{margin:0;justify-content:flex-end}.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:11px}.topic-card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:17px;padding:14px;background:var(--panel-glass);box-shadow:var(--shadow-sm);transition:.18s}.topic-card:hover{transform:translateY(-3px);border-color:var(--line-strong);box-shadow:var(--shadow)}.topic-top{display:flex;justify-content:space-between;gap:7px;align-items:flex-start}.topic-category{font-size:.65rem;color:var(--primary);font-weight:900;text-transform:uppercase;letter-spacing:.08em}.topic-card h3{font-size:1rem;margin:8px 0 7px}.topic-card p{margin:0;color:var(--muted);font-size:.78rem;line-height:1.5;flex:1}.topic-formula{font-family:ui-monospace,monospace;color:var(--primary);font-size:.73rem;margin:11px 0;padding:7px 8px;border-radius:9px;background:var(--panel-soft);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.topic-card .btn{align-self:flex-start;padding:7px 9px;font-size:.7rem}.tools-grid{display:grid;grid-template-columns:1.35fr .65fr;gap:14px}.formula-lab,.unit-tool{padding:16px}.tool-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:14px}.tool-head small{color:var(--primary);font-weight:850;text-transform:uppercase;letter-spacing:.08em}.tool-head h3{margin:4px 0 0}.tool-icon{width:43px;height:43px;border-radius:13px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary2));font-size:1.3rem;font-weight:900}.formula-layout{display:grid;grid-template-columns:230px 1fr;gap:12px}.formula-menu{display:grid;gap:5px;max-height:490px;overflow:auto;padding-right:4px}.formula-menu-btn{border:1px solid var(--line);border-radius:10px;padding:8px 9px;text-align:left;color:var(--text);background:var(--panel);font-size:.72rem}.formula-menu-btn small{display:block;color:var(--muted);margin-top:2px}.formula-menu-btn.active{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 9%,var(--panel))}.formula-workbench{padding:13px;border:1px solid var(--line);border-radius:14px;background:var(--panel-soft)}.formula-display{padding:13px;border-radius:12px;background:var(--panel);border:1px solid var(--line);color:var(--primary);font-size:1.25rem;font-family:ui-monospace,monospace;font-weight:850}.formula-workbench>p{color:var(--muted);font-size:.81rem;line-height:1.5}.formula-inputs{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin:12px 0}.formula-inputs label,.unit-tool label{display:grid;gap:5px;color:var(--muted);font-size:.71rem}.formula-inputs input,.unit-tool input,.unit-tool select{width:100%;border:1px solid var(--line);border-radius:10px;padding:9px;color:var(--text);background:var(--panel)}.formula-answer{margin-top:10px;padding:12px;border:1px solid color-mix(in srgb,var(--green) 28%,var(--line));border-radius:12px;background:color-mix(in srgb,var(--green) 7%,var(--panel))}.formula-answer small{color:var(--muted)}.formula-answer strong{display:block;font-size:1.35rem;margin-top:4px}.formula-answer p{margin:5px 0 0;color:var(--muted);font-size:.75rem;line-height:1.45}.unit-tool>label{margin-bottom:11px}.converter-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.swap-btn{display:block;width:38px;height:38px;margin:10px auto;border:1px solid var(--line);border-radius:50%;background:var(--panel-soft);color:var(--primary);font-weight:900}.unit-note{margin-top:14px;padding:11px;border:1px solid var(--line);border-radius:11px;background:var(--panel-soft);color:var(--muted);font-size:.77rem;line-height:1.45}.mission-progress{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:20px;padding:14px 16px;margin-bottom:13px}.mission-progress strong{display:block}.mission-progress span{display:block;color:var(--muted);font-size:.75rem;margin-top:3px}.progress-track{height:10px;border-radius:99px;background:var(--panel-soft);overflow:hidden;border:1px solid var(--line)}.progress-track div{height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--primary2),var(--green));transition:width .35s}.mission-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.arcade-card{border:1px solid var(--line);border-radius:16px;padding:13px;background:var(--panel-glass);box-shadow:var(--shadow-sm)}.arcade-card.complete{border-color:color-mix(in srgb,var(--green) 43%,var(--line));background:color-mix(in srgb,var(--green) 6%,var(--panel-glass))}.arcade-card-top{display:flex;justify-content:space-between;gap:8px}.arcade-card-icon{width:39px;height:39px;border-radius:12px;display:grid;place-items:center;background:var(--panel-soft)}.arcade-card h3{font-size:.91rem;margin:9px 0 6px}.arcade-card p{margin:0;color:var(--muted);font-size:.73rem;line-height:1.45;min-height:52px}.arcade-card-bottom{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-top:10px}.reward{color:var(--yellow);font-size:.7rem;font-weight:900}.achievement-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:9px}.achievement{padding:12px 9px;text-align:center;border:1px solid var(--line);border-radius:15px;background:var(--panel-glass);filter:grayscale(1);opacity:.55}.achievement.unlocked{filter:none;opacity:1;border-color:color-mix(in srgb,var(--yellow) 38%,var(--line));box-shadow:0 10px 25px color-mix(in srgb,var(--yellow) 12%,transparent)}.achievement-icon{font-size:1.7rem}.achievement strong{display:block;font-size:.73rem;margin-top:6px}.achievement small{display:block;color:var(--muted);font-size:.61rem;margin-top:3px;line-height:1.3}.quiz-section{display:grid;grid-template-columns:.7fr 1.3fr;overflow:hidden}.quiz-intro{padding:23px;background:linear-gradient(145deg,color-mix(in srgb,var(--primary) 15%,var(--panel)),color-mix(in srgb,var(--primary2) 11%,var(--panel)))}.quiz-intro h2{margin:8px 0 10px}.quiz-intro p{color:var(--muted);line-height:1.58}.quiz-stats{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.quiz-stats span{padding:8px 10px;border:1px solid var(--line);border-radius:999px;background:var(--panel-glass);font-size:.72rem}.quiz-player{padding:23px}.quiz-progress{height:9px;border-radius:99px;background:var(--panel-soft);overflow:hidden}.quiz-progress div{height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--primary2));transition:width .3s}.quiz-player>small{display:block;color:var(--muted);margin-top:8px}.quiz-player h3{line-height:1.45;min-height:50px}.quiz-options{display:grid;gap:8px}.quiz-option{border:1px solid var(--line);border-radius:12px;padding:11px 12px;text-align:left;color:var(--text);background:var(--panel);font-weight:700}.quiz-option:hover{border-color:var(--primary)}.quiz-option.correct{border-color:var(--green);background:color-mix(in srgb,var(--green) 9%,var(--panel))}.quiz-option.wrong{border-color:var(--red);background:color-mix(in srgb,var(--red) 8%,var(--panel))}.quiz-feedback{min-height:48px;color:var(--muted);line-height:1.48}.notebook-list{display:grid;gap:9px}.note-card{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:14px;background:var(--panel-glass);box-shadow:var(--shadow-sm)}.note-number{width:39px;height:39px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--primary),var(--primary2));font-weight:900}.note-card h3{margin:0;font-size:.9rem}.note-card p{margin:4px 0;color:var(--muted);font-size:.74rem;line-height:1.42}.note-card small{color:var(--muted);font-size:.65rem}.empty-state{padding:28px;text-align:center;border:1px dashed var(--line-strong);border-radius:17px;color:var(--muted);background:var(--panel-soft)}.footer{width:min(1320px,calc(100% - 28px));margin:0 auto 28px;padding:22px;display:grid;grid-template-columns:auto 1fr 1fr;gap:20px;align-items:center;border:1px solid var(--line);border-radius:20px;background:var(--panel-glass);box-shadow:var(--shadow-sm);color:var(--muted);font-size:.8rem}.footer-logo{display:flex;align-items:center;gap:10px}.footer-logo strong{display:block;color:var(--text)}.footer-logo small{display:block}.footer p{margin:0;text-align:center;line-height:1.65}.footer a{color:var(--primary);font-weight:900}.topic-dialog{width:min(780px,calc(100% - 28px));max-height:88vh;overflow:auto;border:1px solid var(--line);border-radius:22px;padding:22px;background:var(--panel);color:var(--text);box-shadow:var(--shadow)}.topic-dialog::backdrop{background:rgba(3,8,18,.74);backdrop-filter:blur(7px)}.dialog-close{position:sticky;float:right;top:0;width:38px;height:38px;border:1px solid var(--line);border-radius:11px;background:var(--panel-soft);color:var(--text)}.topic-dialog h2{margin:10px 0 7px}.dialog-lead{color:var(--muted);font-size:1rem;line-height:1.65}.dialog-formula{padding:12px 13px;border:1px solid var(--line);border-radius:12px;background:var(--panel-soft);color:var(--primary);font-family:ui-monospace,monospace;font-weight:800}.dialog-sections{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:13px 0}.dialog-section{padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--panel-soft)}.dialog-section h3{font-size:.84rem;margin:0 0 5px}.dialog-section p{margin:0;color:var(--muted);line-height:1.52;font-size:.78rem}.toast{position:fixed;left:50%;bottom:24px;z-index:120;transform:translate(-50%,25px);opacity:0;pointer-events:none;padding:11px 15px;border:1px solid var(--line);border-radius:999px;background:var(--panel);color:var(--text);box-shadow:var(--shadow);font-size:.8rem;font-weight:800;transition:.22s}.toast.show{transform:translate(-50%,0);opacity:1}#confettiLayer{position:fixed;inset:0;z-index:110;pointer-events:none;overflow:hidden}.confetti{position:absolute;top:-20px;width:10px;height:16px;border-radius:3px;animation:confettiFall var(--duration) linear forwards}@keyframes confettiFall{to{transform:translate(var(--drift),110vh) rotate(900deg);opacity:.9}}
@media(max-width:1150px){.nav-links{display:none}.progress-strip{grid-template-columns:repeat(3,1fr)}.topic-grid{grid-template-columns:repeat(3,1fr)}.mission-grid{grid-template-columns:repeat(3,1fr)}.achievement-grid{grid-template-columns:repeat(4,1fr)}.lab-app{grid-template-columns:250px 1fr}.workspace-grid{grid-template-columns:250px 1fr}.readout-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:900px){.hero{grid-template-columns:1fr}.hero-world{min-height:300px}.lab-app{grid-template-columns:1fr}.lab-browser{position:static;max-height:none}.lab-list{display:grid;grid-template-columns:repeat(2,1fr);max-height:340px}.workspace-grid,.tools-grid{grid-template-columns:1fr}.control-panel{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.control-panel>.panel-title,.control-panel>.simulation-actions,.control-panel>#specialActionBtn{grid-column:1/-1}.control-group{margin:0}.formula-layout{grid-template-columns:190px 1fr}.topic-grid{grid-template-columns:repeat(2,1fr)}.mission-grid{grid-template-columns:repeat(2,1fr)}.quiz-section{grid-template-columns:1fr}.footer{grid-template-columns:1fr;text-align:center}.footer-logo{justify-content:center}}
@media(max-width:620px){.topbar-wrap{position:static}.topbar{align-items:flex-start}.brand{min-width:0}.xp-pill,.level-pill{display:none}.shell{width:min(100% - 18px,1320px)}.hero{padding:42px 5px 24px}.hero h1{font-size:clamp(2.35rem,13vw,4rem)}.daily-challenge{grid-template-columns:auto 1fr}.daily-challenge .btn{grid-column:1/-1}.progress-strip{grid-template-columns:repeat(2,1fr)}.mascot-tip{grid-template-columns:auto 1fr}.mascot-tip .icon-btn{grid-column:1/-1;width:100%}.section-heading{align-items:flex-start;flex-direction:column}.confidence-key{justify-content:flex-start}.lab-list{grid-template-columns:1fr}.workspace-head{align-items:flex-start;flex-direction:column}.experiment-guide{gap:4px;overflow:auto;justify-content:flex-start}.experiment-guide i{width:14px}.workspace-grid{padding:10px}.control-panel{grid-template-columns:1fr}.learning-grid{grid-template-columns:1fr;padding:0 10px 10px}.explanation-tabs{padding-left:10px;padding-right:10px}.explanation-panel{margin-left:10px;margin-right:10px}.workspace-footer-actions{padding-left:10px;padding-right:10px}.theory-tools{align-items:stretch;flex-direction:column}.search-box.large{min-width:0}.theory-filters{justify-content:flex-start}.topic-grid,.mission-grid{grid-template-columns:1fr}.formula-layout{grid-template-columns:1fr}.formula-menu{grid-template-columns:repeat(2,1fr);max-height:260px}.formula-inputs{grid-template-columns:1fr}.achievement-grid{grid-template-columns:repeat(2,1fr)}.mission-progress{grid-template-columns:1fr}.dialog-sections{grid-template-columns:1fr}.note-card{grid-template-columns:auto 1fr}.note-card .btn{grid-column:1/-1}.hero-world{min-height:265px}.formula-chip{font-size:.68rem}.progress-strip article:last-child{grid-column:1/-1}}