@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap";:root{--bg-color:#0f172a;--bg-color-secondary:#1e293b;--text-color:#f8fafc;--text-muted:#94a3b8;--primary-color:#3b82f6;--primary-hover:#2563eb;--success-color:#10b981;--error-color:#ef4444;--card-bg:#1e293bb3;--card-border:#ffffff1a;--shadow:0 4px 30px #00000080;--backdrop-blur:10px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-color);-webkit-font-smoothing:antialiased;flex-direction:column;min-height:100vh;font-family:Inter,-apple-system,sans-serif;line-height:1.6;display:flex}#root{flex-direction:column;flex:1;width:100%;max-width:600px;margin:0 auto;display:flex;position:relative}h1,h2,h3{font-weight:700;line-height:1.2}h1{background:linear-gradient(135deg,#60a5fa 0%,#a78bfa 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:1rem;font-size:2rem}.glass-card{background:var(--card-bg);-webkit-backdrop-filter:blur(var(--backdrop-blur));border:1px solid var(--card-border);box-shadow:var(--shadow);border-radius:16px;margin-bottom:1rem;padding:1.5rem;transition:transform .2s,box-shadow .2s}.glass-card:hover{transform:translateY(-2px);box-shadow:0 10px 40px #0009}button{cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-family:Inter,sans-serif;font-size:1rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--primary-color);color:#fff;box-shadow:0 4px 14px #3b82f663}.btn-primary:hover:not(:disabled){background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:0 6px 20px #3b82f680}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-outline{color:var(--text-color);border:1px solid var(--card-border);background-color:#0000}.btn-outline:hover{background-color:#ffffff0d}input,textarea{border:1px solid var(--card-border);color:#fff;background-color:#0003;border-radius:8px;width:100%;margin-bottom:1rem;padding:.75rem 1rem;font-family:Inter,sans-serif;transition:border-color .2s}input:focus,textarea:focus{border-color:var(--primary-color);outline:none;box-shadow:0 0 0 2px #3b82f633}.quiz-option{text-align:left;border:1px solid var(--card-border);width:100%;color:var(--text-color);background-color:#ffffff0d;border-radius:12px;margin-bottom:.75rem;padding:1rem;font-size:1rem;display:block}.quiz-option:hover:not(:disabled){background-color:#ffffff1a}.quiz-option.selected{border-color:var(--primary-color);background-color:#3b82f61a}.quiz-option.correct{border-color:var(--success-color);background-color:#10b9811a}.quiz-option.incorrect{border-color:var(--error-color);background-color:#ef44441a}.progress-bar{background-color:#ffffff1a;border-radius:3px;width:100%;height:6px;margin-bottom:1.5rem;overflow:hidden}.progress-fill{background-color:var(--primary-color);height:100%;transition:width .3s}.math-container{background-color:#0000004d;border-radius:8px;margin:1rem 0;padding:1rem;overflow-x:auto}.text-center{text-align:center}.mt-4{margin-top:1rem}.mb-4{margin-bottom:1rem}.text-muted{color:var(--text-muted);font-size:.9rem}.flex{display:flex}.items-center{align-items:center}.justify-between{justify-content:space-between}.p-4{padding:1rem}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.lucide-spin{animation:2s linear infinite spin}