*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;font-size:15px;line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;min-height:100vh}:root{--bg: #070912;--bg-elevated: rgba(17, 22, 38, .6);--bg-glass: rgba(22, 28, 46, .45);--bg-glass-hover: rgba(28, 36, 58, .6);--border: rgba(255, 255, 255, .08);--border-strong: rgba(255, 255, 255, .16);--text: #f5f7fb;--text-secondary: #b4bacc;--text-muted: #7a8096;--accent: #00ff9d;--accent-dim: #00cc7e;--accent-glow: rgba(0, 255, 157, .4);--violet: #7c3aed;--violet-glow: rgba(124, 58, 237, .4);--cyan: #22d3ee;--success: #00ff9d;--error: #ff4d6d;--warning: #ffb94d;--gradient-primary: linear-gradient(135deg, #00ff9d 0%, #22d3ee 100%);--gradient-accent: linear-gradient(135deg, #7c3aed 0%, #22d3ee 50%, #00ff9d 100%);--gradient-card: linear-gradient( 135deg, rgba(255, 255, 255, .06) 0%, rgba(255, 255, 255, .02) 100% );--radius-sm: 8px;--radius: 14px;--radius-lg: 20px;--radius-xl: 28px;--shadow-glow: 0 0 40px rgba(0, 255, 157, .15);--shadow-card: 0 10px 40px rgba(0, 0, 0, .4);--shadow-deep: 0 20px 60px rgba(0, 0, 0, .6);--font-display: "Space Grotesk", "Inter", sans-serif;--font-body: "Inter", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace}body:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 80% 60% at 15% 10%,rgba(124,58,237,.22),transparent 60%),radial-gradient(ellipse 70% 50% at 85% 30%,rgba(0,255,157,.18),transparent 60%),radial-gradient(ellipse 90% 70% at 50% 100%,rgba(34,211,238,.15),transparent 60%);pointer-events:none;z-index:-2}body:after{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background-image:linear-gradient(rgba(255,255,255,.015) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.015) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,black 40%,transparent 90%);-webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 30%,black 40%,transparent 90%);pointer-events:none;z-index:-1}#root{min-height:100vh;display:flex;flex-direction:column}.container{width:100%;max-width:680px;margin:0 auto;padding:32px 20px;flex:1;display:flex;flex-direction:column;justify-content:flex-start}.container-center{justify-content:center}.header{display:flex;align-items:center;justify-content:space-between;padding:18px 28px;background:#07091299;backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}.header-brand{display:flex;align-items:center;gap:10px}.brand-mark{width:34px;height:34px;border-radius:10px;background:var(--gradient-primary);display:grid;place-items:center;font-family:var(--font-mono);font-weight:700;font-size:15px;color:#0a0e1a;box-shadow:0 4px 20px var(--accent-glow)}.header h1{font-family:var(--font-display);font-size:18px;font-weight:700;letter-spacing:-.02em;background:var(--gradient-primary);-webkit-background-clip:text;background-clip:text;color:transparent}.header-actions{display:flex;align-items:center;gap:12px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 24px;border:none;border-radius:var(--radius);font-family:var(--font-body);font-size:15px;font-weight:600;letter-spacing:-.01em;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);text-decoration:none;position:relative;overflow:hidden;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}.btn:active:not(:disabled){transform:scale(.97)}.btn-primary{background:var(--gradient-primary);color:#0a0e1a;box-shadow:0 8px 30px var(--accent-glow),inset 0 1px #ffffff4d}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 12px 40px var(--accent-glow),inset 0 1px #fff6}.btn-secondary{background:var(--bg-glass);color:var(--text);border:1px solid var(--border-strong);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}.btn-secondary:hover:not(:disabled){background:var(--bg-glass-hover);border-color:var(--accent)}.btn-ghost{background:transparent;color:var(--text-secondary);padding:8px 14px;font-size:13px;font-weight:500}.btn-ghost:hover:not(:disabled){color:var(--text);background:#ffffff0d}.btn-block{width:100%}.btn-lg{padding:18px 28px;font-size:16px}.glass{background:var(--gradient-card);backdrop-filter:blur(24px) saturate(160%);-webkit-backdrop-filter:blur(24px) saturate(160%);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);position:relative;overflow:hidden}.glass:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;border-radius:inherit;padding:1px;background:linear-gradient(135deg,#ffffff1f,#fff0 30%,#fff0 70%,#ffffff14);-webkit-mask:linear-gradient(#fff 0 0) content-box,linear-gradient(#fff 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}.glass-padded{padding:36px 32px}.glass-hero{padding:48px 36px}h1,h2,h3{font-family:var(--font-display);letter-spacing:-.025em;line-height:1.15}h2{font-size:32px;font-weight:700;margin-bottom:8px}h3{font-size:22px;font-weight:600}.subtitle{font-size:15px;color:var(--text-secondary);margin-bottom:28px;line-height:1.5}.eyebrow{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:#00ff9d14;border:1px solid rgba(0,255,157,.2);border-radius:100px;font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:20px}.eyebrow:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 8px var(--accent);animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}.form-group{margin-bottom:20px}.form-label{display:block;margin-bottom:10px;font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted)}.form-input{width:100%;padding:16px 18px;background:#ffffff0a;border:1.5px solid var(--border-strong);border-radius:var(--radius);color:var(--text);font-family:inherit;font-size:15px;transition:all .2s}.form-input::placeholder{color:var(--text-muted)}.form-input:focus{outline:none;border-color:var(--accent);background:#00ff9d0a;box-shadow:0 0 0 4px #00ff9d1a}.options-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px}.option-card{padding:20px 16px;background:#ffffff08;border:1.5px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);text-align:center;position:relative;overflow:hidden}.option-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:var(--gradient-primary);opacity:0;transition:opacity .3s;z-index:0}.option-card>*{position:relative;z-index:1}.option-card:hover{transform:translateY(-3px);border-color:#00ff9d66;background:#00ff9d0a;box-shadow:0 12px 30px #00ff9d1a}.option-card:hover .option-card-icon{transform:scale(1.08)}.option-card-icon{transition:transform .2s cubic-bezier(.34,1.56,.64,1)}.option-card.active{border-color:var(--accent);background:#00ff9d14;box-shadow:0 0 30px #00ff9d26,inset 0 0 20px #00ff9d0d}.option-card-icon{font-family:var(--font-mono);font-size:22px;font-weight:700;color:var(--accent);margin-bottom:6px}.option-card-label{font-size:14px;font-weight:600;color:var(--text)}.option-card-sub{font-size:11px;color:var(--text-muted);margin-top:2px}.progress-wrap{margin-bottom:28px}.progress-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-family:var(--font-mono);font-size:12px;color:var(--text-muted);letter-spacing:.05em;text-transform:uppercase}.progress-bar{width:100%;height:4px;background:#ffffff0f;border-radius:100px;overflow:hidden;position:relative}.progress-fill{height:100%;background:var(--gradient-primary);border-radius:100px;transition:width .5s cubic-bezier(.4,0,.2,1);box-shadow:0 0 12px var(--accent-glow)}.question-text{font-family:var(--font-display);font-size:24px;font-weight:600;line-height:1.3;margin:8px 0 28px;letter-spacing:-.02em}.answers{display:flex;flex-direction:column;gap:12px;margin-bottom:24px}.answer{display:flex;align-items:center;gap:16px;padding:18px 20px;background:#ffffff08;border:1.5px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1);font-size:15px;color:var(--text);text-align:left}.answer:hover:not(.disabled){background:#00ff9d0a;border-color:#00ff9d4d;transform:translate(4px);box-shadow:-4px 0 0 0 var(--accent),0 0 24px #00ff9d14}.answer:hover:not(.disabled) .answer-key{background:#00ff9d1a;border-color:#00ff9d66;color:var(--accent)}.answer.selected{border-color:var(--accent);background:#00ff9d14;box-shadow:0 0 24px #00ff9d1f}.answer.correct{border-color:var(--success);background:#00ff9d1f;box-shadow:0 0 32px #00ff9d33}.answer.incorrect{border-color:var(--error);background:#ff4d6d1a;animation:answerShake .5s cubic-bezier(.36,.07,.19,.97)}@keyframes answerShake{10%,90%{transform:translate(-2px)}20%,80%{transform:translate(4px)}30%,50%,70%{transform:translate(-5px)}40%,60%{transform:translate(5px)}}.answer.disabled{cursor:default;pointer-events:none}.answer.disabled:not(.correct):not(.incorrect){opacity:.4}.answer-key{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;flex-shrink:0;background:#ffffff0f;border:1px solid var(--border-strong);border-radius:10px;font-family:var(--font-mono);font-size:14px;font-weight:700;color:var(--text-secondary);transition:all .2s}.answer.selected .answer-key,.answer.correct .answer-key{background:var(--gradient-primary);color:#0a0e1a;border-color:transparent;box-shadow:0 0 16px var(--accent-glow)}.answer.incorrect .answer-key{background:var(--error);color:#fff;border-color:transparent}.answer-text{flex:1;font-weight:500;line-height:1.4}.answer-icon{font-size:18px;flex-shrink:0}.feedback{margin-top:20px;padding:18px 20px;border-radius:var(--radius);border:1px solid var(--border);animation:slideUp .3s cubic-bezier(.4,0,.2,1)}@keyframes slideUp{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.feedback-correct{background:linear-gradient(135deg,#00ff9d14,#22d3ee0a);border-color:#00ff9d4d}.feedback-incorrect{background:linear-gradient(135deg,#ff4d6d14,#7c3aed0a);border-color:#ff4d6d4d}.feedback-header{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:15px;margin-bottom:8px}.feedback-correct .feedback-header{color:var(--accent)}.feedback-incorrect .feedback-header{color:var(--error)}.feedback-body{font-size:14px;color:var(--text-secondary);line-height:1.55}.score-hero{text-align:center;padding:20px 0 32px}.score-circle{width:180px;height:180px;margin:0 auto 24px;border-radius:50%;display:grid;place-items:center;position:relative;background:conic-gradient(var(--accent) 0deg,var(--cyan) calc(var(--score-deg, 270deg) * .5),var(--violet) var(--score-deg, 270deg),rgba(255,255,255,.04) var(--score-deg, 270deg));animation:scoreReveal 1s cubic-bezier(.4,0,.2,1)}@keyframes scoreReveal{0%{transform:scale(.6) rotate(-30deg);opacity:0}to{transform:scale(1) rotate(0);opacity:1}}.score-circle:before{content:"";position:absolute;top:12px;right:12px;bottom:12px;left:12px;border-radius:50%;background:var(--bg);box-shadow:inset 0 0 30px #0009}.score-inner{position:relative;text-align:center}.score-big{font-family:var(--font-display);font-size:56px;font-weight:800;line-height:1;background:var(--gradient-primary);-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:-.04em}.score-unit{font-family:var(--font-mono);font-size:14px;color:var(--text-muted);margin-top:4px;letter-spacing:.1em}.score-detail{font-size:14px;color:var(--text-secondary);margin-bottom:6px}.score-message{font-family:var(--font-display);font-size:20px;font-weight:600;color:var(--text);margin-top:12px}.alert{padding:14px 18px;border-radius:var(--radius);margin-bottom:20px;font-size:14px;display:flex;align-items:center;gap:10px;border:1px solid var(--border);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}.alert-error{background:#ff4d6d14;border-color:#ff4d6d4d;color:#ffb3c1}.alert-info{background:#22d3ee14;border-color:#22d3ee4d;color:#a5e9f5}.lang-switcher{display:inline-flex;gap:2px;padding:4px;background:#ffffff0a;border:1px solid var(--border);border-radius:100px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}.lang-switcher button{background:transparent;border:none;color:var(--text-muted);padding:6px 14px;font-family:var(--font-mono);font-size:11px;font-weight:700;cursor:pointer;border-radius:100px;letter-spacing:.1em;transition:all .2s}.lang-switcher button:hover{color:var(--text)}.lang-switcher button.active{background:var(--gradient-primary);color:#0a0e1a;box-shadow:0 0 14px var(--accent-glow)}.footer{padding:20px;text-align:center;color:var(--text-muted);font-size:12px;font-family:var(--font-mono);letter-spacing:.05em}.footer-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;background:var(--bg-glass);border:1px solid var(--border);border-radius:100px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}.footer-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 8px var(--accent)}.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(10,14,26,.3);border-top-color:#0a0e1a;border-radius:50%;animation:spin .7s linear infinite}.btn-secondary .spinner{border-color:#fff3;border-top-color:var(--text)}@keyframes spin{to{transform:rotate(360deg)}}.loading-center{display:grid;place-items:center;min-height:60vh}.loading-center .spinner{width:32px;height:32px;border-width:3px;border-color:#00ff9d33;border-top-color:var(--accent)}.text-center{text-align:center}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mt-32{margin-top:32px}.actions-row{display:flex;gap:12px;margin-top:24px}.actions-row .btn{flex:1}.reveal{animation:reveal .5s cubic-bezier(.4,0,.2,1)}@keyframes reveal{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.slide-in{animation:slideIn .45s cubic-bezier(.4,0,.2,1)}@keyframes slideIn{0%{opacity:0;transform:translate(40px)}to{opacity:1;transform:translate(0)}}.shake{animation:shake .5s cubic-bezier(.36,.07,.19,.97)}@keyframes shake{10%,90%{transform:translate(-2px)}20%,80%{transform:translate(4px)}30%,50%,70%{transform:translate(-6px)}40%,60%{transform:translate(6px)}}.bounce{animation:bounceIn .7s cubic-bezier(.34,1.56,.64,1)}@keyframes bounceIn{0%{opacity:0;transform:scale(.3)}60%{opacity:1;transform:scale(1.08)}to{transform:scale(1)}}@media (max-width: 640px){.header{padding:14px 18px}.header h1{font-size:16px}.brand-mark{width:30px;height:30px;font-size:13px}.container{padding:20px 16px}.glass-padded{padding:24px 20px}.glass-hero{padding:32px 22px}h2{font-size:26px}.question-text{font-size:20px}.score-circle{width:150px;height:150px}.score-big{font-size:44px}.score-message{font-size:18px}.options-grid{grid-template-columns:repeat(3,1fr);gap:8px}.option-card{padding:14px 8px}.option-card-icon{font-size:18px}.option-card-label{font-size:13px}.option-card-sub{font-size:10px}}