:root{--bg: #f4f7fb;--surface: #ffffff;--text: #0f172a;--muted: #475569;--line: #dbeafe;--accent: #1d4ed8;--accent-2: #1e40af}:root[data-theme=dark]{--bg: #020617;--surface: #0b1220;--text: #e2e8f0;--muted: #94a3b8;--line: rgba(148, 163, 184, .35)}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%;width:100%}body{background:radial-gradient(circle at 50% 0,#dbeafe,var(--bg));color:var(--text);font-family:Segoe UI,Roboto,Helvetica,Arial,sans-serif}main{padding:12px}.panel,.question,.quiz-question,.result-screen,.topics,.question-wrap{background:color-mix(in srgb,var(--surface) 92%,white);border:1px solid var(--line);border-radius:14px;padding:14px;margin:10px 0}h1,h2,h3,p{margin:0 0 10px}button,input,select,textarea{border:1px solid var(--line);border-radius:10px;font-family:inherit}button{color:var(--text);background:#fff}.primary{width:100%;padding:12px 14px;color:#fff;background:var(--accent);border-color:transparent}.ghost{padding:10px 12px;background:transparent}.toolbar{display:grid;grid-template-columns:1fr 1fr;gap:10px}.admin-actions{grid-template-columns:1fr 1fr;margin:8px 0}.topic-grid{display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));margin:8px 0 12px}.topic-chip{display:grid;grid-template-columns:20px 1fr;gap:6px;align-items:center;background:#fff;border:1px solid var(--line);color:var(--text)}.topic-chip.active{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 14%,#fff)}.question-label{display:inline-flex;align-items:center;gap:6px;margin-bottom:8px;font-weight:600}.answer-input,textarea{width:100%;padding:10px;background:#fff;color:var(--text);border-radius:10px}.quiz-form{display:grid;gap:14px}.question-media{display:block;width:100%;max-width:360px;border-radius:10px;border:1px solid var(--line);margin-bottom:10px;background:#fff}.code-block{border:1px solid var(--line);border-radius:10px;padding:8px;overflow:auto;background:#0f172a;color:#f8fafc}.three-stage{margin:8px 0;perspective:600px}.three-sphere{width:120px;height:120px;margin:0 auto;border-radius:50%;background:radial-gradient(circle at 35% 35%,#fff,var(--accent));transform-style:preserve-3d;animation:spin 4s linear infinite}@keyframes spin{0%{transform:rotateY(0) rotateX(0)}to{transform:rotateY(360deg) rotateX(360deg)}}.music-staff{width:100%;height:90px;border:1px solid var(--line);border-radius:10px;margin:8px 0;padding:8px}.result-score{font-size:36px;margin:10px 0;font-weight:700}.result-actions{display:grid;gap:8px}.progress-wrap{margin:12px 0}.progress-head{display:flex;justify-content:space-between;margin-bottom:6px;color:var(--muted);font-size:14px}.progress-track{background:var(--line);border-radius:999px;height:12px;overflow:hidden}.progress-fill{background:var(--accent);height:12px;transition:width .25s}.tiny{font-size:12px;color:var(--muted)}.hint{margin:6px 0 0;color:var(--muted);font-size:12px}.error{color:#b91c1c}.empty-card{margin-top:14px;padding:16px;text-align:center;border:1px dashed var(--line);border-radius:12px}@media(max-width:640px){h1{font-size:22px}.admin-actions,.toolbar{grid-template-columns:1fr}}