:root{--bg-primary:#0a0e1a;--bg-secondary:#111827;--bg-card:#1a1f35;--bg-card-hover:#222844;--bg-elevated:#1e294ab3;--accent-primary:#6366f1;--accent-primary-glow:#6366f140;--accent-secondary:#8b5cf6;--accent-teal:#14b8a6;--accent-amber:#f59e0b;--accent-rose:#f43f5e;--accent-emerald:#10b981;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--text-accent:#a5b4fc;--border-subtle:#94a3b81a;--border-active:#6366f166;--gradient-hero:linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);--gradient-card:linear-gradient(145deg, #1e294a99, #111827cc);--gradient-glass:linear-gradient(135deg, #ffffff0d, #ffffff05);--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 4px 20px #0006;--shadow-lg:0 8px 40px #00000080;--shadow-glow:0 0 30px var(--accent-primary-glow);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--transition:all .25s cubic-bezier(.4, 0, .2, 1);--transition-slow:all .4s cubic-bezier(.4, 0, .2, 1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{background:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6;overflow-x:hidden}#root{min-height:100vh}.loading-screen{flex-direction:column;justify-content:center;align-items:center;gap:1rem;min-height:100vh;display:flex}.loading-spinner{border:3px solid var(--border-subtle);border-top-color:var(--accent-primary);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.login-container{background:radial-gradient(ellipse at 20% 50%, #6366f114, transparent 60%), radial-gradient(ellipse at 80% 20%, #8b5cf60f, transparent 50%), 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1.5rem;font-family:inherit;font-size:.9rem}.btn-secondary:hover{border-color:var(--accent-primary)}body::-webkit-scrollbar{width:6px}body::-webkit-scrollbar-track{background:var(--bg-primary)}body::-webkit-scrollbar-thumb{background:#94a3b826;border-radius:3px}body::-webkit-scrollbar-thumb:hover{background:#94a3b84d}@media (width<=640px){.login-card{border-radius:var(--radius-lg);padding:1.8rem 1.5rem}.login-header h1{font-size:1.3rem}.player-main{padding:0 1rem 1.5rem}.player-topbar{padding:.8rem 0}.topbar-title h2{font-size:.95rem}.topbar-logout span:not(svg){display:none}.question-text{font-size:1rem}.question-card,.answer-card,.player-controls{padding:1.2rem}.playback-row{flex-wrap:wrap}.ctrl-btn{flex:1;justify-content:center;min-width:0}.nav-row{gap:.8rem}.play-btn{width:56px;height:56px}.shortcuts-hint{display:none}.sidebar{width:300px;left:-310px}.speed-buttons{gap:.2rem}.speed-btn{padding:.3rem 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