:root{--bg:#0a101c;--surface:#111a2a;--surface2:#162236;--stroke:#263348;--muted:#a0afc4;--white:#f5f8ff;--lime:#c4fb63;--blue:#7ec8ff;--bad:#ff8b87;--radius:20px;font-synthesis:none;color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--white);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5;min-height:100vh}button,input{font:inherit}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}a{color:inherit}.ambient{position:fixed;border-radius:50%;filter:blur(100px);pointer-events:none;z-index:-1}.ambient-one{width:430px;height:430px;background:#174b56;top:-300px;left:8%;opacity:.35}.ambient-two{width:450px;height:450px;background:#21375e;top:300px;right:-290px;opacity:.24}.shell{max-width:1120px;padding:0 26px;margin:auto;min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;min-height:99px;border-bottom:1px solid rgba(188,211,237,.11);gap:12px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;white-space:nowrap}.brand-symbol{height:43px;width:43px;display:grid;place-items:center;border:1.5px solid var(--lime);color:var(--lime);border-radius:14px;font-size:28px;line-height:1}.brand strong{font-size:17px;letter-spacing:1px}.brand-light{font-weight:550}.brand small{display:block;font-size:10px;letter-spacing:2.3px;color:var(--muted);font-weight:700;margin-top:1px}.top-actions{display:flex;gap:14px;align-items:center}.user-name{color:#e8f6fd;font-weight:650}.pill{display:inline-flex;align-items:center;gap:9px;padding:8px 13px;border:1px solid var(--stroke);background:#152235;border-radius:100px;font-size:12px;color:#d1deee;font-weight:700}.online-dot{height:7px;width:7px;border-radius:50%;background:var(--lime);box-shadow:0 0 12px #c4fb6390}main{flex:1;padding:36px 0 60px}.footer{display:flex;justify-content:space-between;gap:20px;font-size:12px;color:#8798af;border-top:1px solid rgba(188,211,237,.11);padding:25px 0 34px}.hidden{display:none!important}.eyebrow{color:var(--lime);font-size:11px;letter-spacing:2.5px;text-transform:uppercase;font-weight:800;margin:0 0 14px}.hero{display:flex;justify-content:space-between;gap:32px;align-items:end;margin-bottom:29px}.hero h1,.auth-heading h1{font-size:clamp(32px,5vw,51px);line-height:1.08;letter-spacing:-2.1px;font-weight:770;margin:0 0 13px}.hero h1 span{color:var(--lime)}.subtext{max-width:560px;color:var(--muted);font-size:15px;margin:0}.stat-inline{font-size:14px;color:var(--muted)}.stat-inline strong{color:var(--white)}.grid{display:grid;gap:20px}.grid.two{grid-template-columns:1fr 1fr}.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.panel{background:linear-gradient(146deg,#152032f5,#0f1827f7);border:1px solid var(--stroke);border-radius:var(--radius);padding:25px;box-shadow:0 8px 25px #00000016}.panel-dark{background:linear-gradient(150deg,#172438,#102031)}.panel.featured{border-color:#66864b80;position:relative;overflow:hidden}.panel.featured:after{content:"↗";position:absolute;right:-4px;bottom:-50px;opacity:.055;color:var(--lime);font-size:210px;line-height:1}.panel>*{position:relative;z-index:1}.section-title{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:36px 0 17px}.section-title h2{font-size:19px;letter-spacing:-.5px;margin:0}.section-title small{font-size:13px;color:var(--muted)}.mode-icon{width:44px;height:44px;display:grid;place-items:center;font-size:21px;border-radius:12px;background:#21374a;border:1px solid #34516b;margin-bottom:17px}.mode-icon.lime{color:var(--lime);background:#2a3c2d;border-color:#40593c}.mode-icon.blue{color:var(--blue)}.mode-tag{font-size:11px;letter-spacing:1.4px;font-weight:800;color:var(--lime);text-transform:uppercase}.mode-title{font-size:23px;letter-spacing:-.7px;margin:7px 0 9px}.mode-description{font-size:14px;color:var(--muted);min-height:69px;margin-bottom:20px}.meta{display:flex;flex-wrap:wrap;gap:8px;color:#cad7e7;font-size:12px;margin:13px 0 22px}.meta span{padding:5px 9px;background:#223246;border-radius:7px}.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:1px solid transparent;border-radius:11px;padding:12px 18px;font-weight:750;font-size:14px;transition:transform .13s,background .13s,border-color .13s;text-decoration:none}.button:active:not(:disabled){transform:translateY(1px)}.button-primary{background:var(--lime);color:#172317}.button-primary:hover:not(:disabled){background:#d8ffa0}.button-secondary{color:#e8f3ff;background:#253650;border-color:#324963}.button-secondary:hover:not(:disabled){background:#314967}.button-ghost{background:transparent;color:#c4d1e3;border-color:var(--stroke)}.button-ghost:hover{background:#202f46}.button-small{padding:8px 12px;font-size:12px}.button-full{width:100%}.button-text{color:var(--blue);background:transparent;padding:8px;border:0}.button-text:hover{text-decoration:underline}.scorecard{display:flex;align-items:center;justify-content:space-between;gap:20px}.score-number{font-size:39px;font-weight:780;letter-spacing:-1.7px;line-height:1.1}.score-label{font-size:12px;color:var(--muted);font-weight:650;letter-spacing:.35px;margin-top:8px}.mini-info{color:var(--lime);font-size:12px;font-weight:700}.progress-track{height:7px;background:#2e3e55;border-radius:20px;overflow:hidden}.progress-bar{height:100%;background:linear-gradient(90deg,#82cb9a,var(--lime));border-radius:20px;transition:width .3s}.progress-caption{display:flex;justify-content:space-between;align-items:center;margin:12px 0 8px;color:var(--muted);font-size:12px}.table-scroll{width:100%;overflow-x:auto}.leaderboard{width:100%;border-collapse:collapse;min-width:490px}.leaderboard th{text-align:left;color:#8f9fb4;font-size:11px;letter-spacing:1.1px;text-transform:uppercase;padding:14px 10px;border-bottom:1px solid var(--stroke)}.leaderboard td{padding:16px 10px;border-bottom:1px solid #25334880;font-size:14px}.leaderboard tbody tr:last-child td{border-bottom:0}.leaderboard tr.self{background:#8ec86c10}.leaderboard .medal{font-size:19px;font-weight:750}.leaderboard .leader-name{font-weight:720}.leaderboard .rank-self{font-size:11px;color:var(--lime);margin-left:8px}.muted{color:var(--muted)}.label-row{display:flex;justify-content:space-between;gap:14px;align-items:center}.notice{padding:14px 17px;color:#d8d9bd;background:#aa9c3220;border:1px solid #a99b4152;border-radius:12px;font-size:13px;margin-top:22px}.notice strong{color:#f4e6a9}.warn{color:#ead9a8!important}.auth-wrap{min-height:65vh;display:grid;grid-template-columns:1fr 420px;gap:60px;align-items:center}.auth-heading{padding:20px 0}.auth-heading h1 span{color:var(--lime)}.auth-panel{padding:31px}.form-field{margin:16px 0}.form-field label{display:block;font-size:12px;font-weight:700;color:#c8d6ea;margin:0 0 8px}.input{display:block;width:100%;background:#0c1422;border:1px solid #314159;color:#fff;outline:none;padding:13px 14px;border-radius:11px;font-size:14px}.input:focus{border-color:#9de064;box-shadow:0 0 0 3px #9de06423}.helper{color:var(--muted);font-size:12px}.auth-switch{margin:15px 0 0;text-align:center;font-size:13px;color:var(--muted)}.auth-switch button{color:var(--lime);border:0;background:none;font-weight:750}.auth-graphic{margin-top:30px;border:1px solid #2e4553;border-radius:20px;overflow:hidden;min-height:180px;position:relative;background:radial-gradient(ellipse at 70% 18%,#254b55,transparent 55%),linear-gradient(135deg,#172638,#13202e)}.auth-graphic .orbit{position:absolute;border:1px solid #7ea6b94d;border-radius:50%;width:270px;height:270px;top:-124px;right:-45px}.auth-graphic .flight{position:absolute;top:48px;left:34px;color:var(--lime);font-size:49px;font-weight:300}.auth-graphic p{position:absolute;bottom:20px;left:27px;color:#adbdcd;font-size:11px;letter-spacing:2px;font-weight:750}.quiz-frame{max-width:780px;margin:0 auto}.quiz-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:27px}.quiz-type{font-size:12px;letter-spacing:1px;font-weight:750;text-transform:uppercase;color:var(--lime)}.quiz-progress{display:flex;align-items:center;justify-content:space-between;margin:8px 0 14px;color:#cddbf1;font-size:13px}.quiz-progress strong{font-size:17px}.quiz-card{padding:30px;margin-top:24px}.quiz-label{display:flex;gap:10px;align-items:center;justify-content:space-between;color:var(--muted);font-size:12px}.quiz-card h2{font-size:clamp(21px,3vw,30px);line-height:1.34;letter-spacing:-.7px;margin:18px 0 27px;font-weight:750}.option-list{display:grid;gap:11px}.option{border:1px solid #34435a;background:#162439;border-radius:13px;padding:15px;text-align:left;display:flex;align-items:center;gap:15px;color:#e6ecf4;transition:border .16s,background .16s;min-height:59px}.option:hover:not(:disabled){border-color:#7f9baf;background:#1f3048}.option.selected{border-color:#a9e86b;background:#9dde631d}.option.correct{background:#6fb95724;border-color:#91dd72}.option.wrong{background:#e37c7620;border-color:#d88381}.option-letter{flex-shrink:0;width:31px;height:31px;border-radius:8px;display:grid;place-items:center;font-size:12px;font-weight:850;background:#314159;color:#c5d8f3}.option.selected .option-letter{background:var(--lime);color:#172317}.quiz-actions{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-top:25px}.answer-feedback{margin-top:22px;border-radius:13px;background:#172b29;border:1px solid #45776c;padding:19px}.answer-feedback.bad{background:#352327;border-color:#7f4c54}.feedback-title{font-weight:800;margin-bottom:9px}.answer-feedback p{margin:9px 0;color:#dce7f0;font-size:14px}.review-alert{margin-top:18px;border-radius:10px;background:#d99d2e15;border:1px solid #b58d4360;color:#eed9ae;padding:11px 14px;font-size:12px}.finished{text-align:center;padding:50px 30px}.finished .giant{font-size:58px;font-weight:800;line-height:1.2;color:var(--lime);letter-spacing:-3px}.finished h2{margin:12px 0;font-size:31px}.finished p{max-width:500px;margin:0 auto 22px;color:var(--muted)}.review-item{padding:22px;margin-bottom:12px}.review-item h3{font-size:16px;margin:9px 0}.review-answer{font-size:13px;line-height:1.6;color:#cad9e8}.review-answer strong{color:var(--lime)}.review-item p{font-size:13px;color:var(--muted)}.review-controls{display:flex;gap:10px;align-items:center;margin-bottom:18px;flex-wrap:wrap}.loading{display:flex;align-items:center;justify-content:center;gap:14px;min-height:45vh;color:var(--muted)}.spinner{width:19px;height:19px;border:2px solid var(--stroke);border-top-color:var(--lime);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#toast{position:fixed;bottom:22px;right:22px;z-index:100;max-width:420px;border:1px solid #6a6764;background:#222d39;color:#eef8ff;padding:14px 18px;border-radius:12px;box-shadow:0 12px 30px #0008;display:none;font-size:13px}#toast.visible{display:block}@media(max-width:760px){.shell{padding:0 16px}.topbar{min-height:80px}.brand strong{font-size:14px}.brand-symbol{width:38px;height:38px}.brand small{font-size:8px}.pill-live{display:none}.top-actions{gap:8px}.grid.two,.grid.three,.auth-wrap{grid-template-columns:1fr}.auth-wrap{gap:4px}.auth-heading{padding:5px 0}.auth-graphic{display:none}.hero{display:block}.hero h1{letter-spacing:-1px}.panel{padding:20px}.mode-description{min-height:auto}.score-number{font-size:32px}.footer{display:block;line-height:2}.quiz-card{padding:20px}.quiz-actions{flex-wrap:wrap}.quiz-actions>.button{flex:1}.quiz-card h2{margin:15px 0 22px}.section-title{margin:28px 0 14px}}.focus-rows{display:grid;gap:0;margin-top:20px;border-top:1px solid var(--stroke)}.focus-row{display:grid;grid-template-columns:65px minmax(0,1fr) 180px;align-items:center;gap:12px;padding:13px 0;border-bottom:1px solid var(--stroke);font-size:13px}.focus-row strong{color:var(--lime)}.focus-row span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#e4ecf6}.focus-row small{color:var(--muted);text-align:right}@media(max-width:760px){.focus-row{grid-template-columns:55px minmax(0,1fr)}.focus-row small{grid-column:2;text-align:left}}