:root{--primary:#00d2ff;--secondary:#3a7bd5;--bg-dark:#0f172a;--bg-card:#1e293bb3;--text-main:#f8fafc;--text-muted:#94a3b8;--success:#10b981;--error:#ef4444;--font-family:"Inter", system-ui, -apple-system, sans-serif;--transition:all .3s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);color:var(--text-main);background:radial-gradient(circle at 100% 0,#1e293b,#0f172a);min-height:100vh;overflow-x:hidden}.glass-card{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid #ffffff1a;border-radius:1.5rem;box-shadow:0 25px 50px -12px #00000080}.btn{cursor:pointer;transition:var(--transition);border:none;border-radius:.75rem;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-weight:600;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 20px -5px #00d2ff66}.btn-secondary{color:var(--text-main);background:#ffffff1a;border:1px solid #ffffff1a}.btn-secondary:hover{background:#fff3}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.5s ease-out forwards fadeIn}.container{flex-direction:column;max-width:1000px;min-height:100vh;margin:0 auto;padding:2rem 1rem;display:flex}.header{text-align:center;margin-bottom:3rem}.header h1{background:linear-gradient(90deg,#00d2ff,#3a7bd5);-webkit-text-fill-color:transparent;-webkit-background-clip:text;margin-bottom:.5rem;font-size:3rem}.header p{color:var(--text-muted);font-size:1.1rem}.user-grid{grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:1.5rem;display:grid}.user-card{text-align:center;cursor:pointer;transition:var(--transition);padding:2rem}.user-card:hover{border-color:var(--primary);background:#ffffff26;transform:translateY(-5px)}.user-avatar{background:linear-gradient(135deg, var(--primary), var(--secondary));color:#fff;border-radius:50%;justify-content:center;align-items:center;width:60px;height:60px;margin:0 auto 1rem;font-size:1.5rem;font-weight:700;display:flex}.dashboard-card{padding:3rem}.dashboard-header{justify-content:space-between;align-items:center;margin-bottom:2rem;display:flex}.stats-row{gap:2rem;margin-bottom:3rem;display:flex}.stat-item{text-align:center;background:#ffffff0d;border-radius:1rem;flex:1;padding:1.5rem}.stat-label{color:var(--text-muted);margin-bottom:.5rem;font-size:.9rem;display:block}.stat-value{color:var(--primary);font-size:2rem;font-weight:700}.quiz-options{grid-template-columns:1fr 1fr;gap:1rem;display:grid}.btn-lg{padding:1.5rem;font-size:1.1rem}.quiz-progress{margin-bottom:1.5rem}.progress-bar{background:#ffffff1a;border-radius:4px;width:100%;height:8px;margin-top:.5rem;overflow:hidden}.progress-fill{background:linear-gradient(to right, var(--primary), var(--secondary));height:100%;transition:width .4s ease-out}.question-card{padding:3rem}.question-text{margin-bottom:2rem;font-size:1.5rem;line-height:1.4}.options-list{flex-direction:column;gap:1rem;display:flex}.option-item{cursor:pointer;transition:var(--transition);background:#ffffff0d;border:1px solid #ffffff1a;border-radius:1rem;align-items:center;gap:1rem;padding:1.25rem;display:flex}.option-item:hover:not(.disabled){background:#ffffff1a;border-color:#ffffff4d}.option-key{background:#ffffff1a;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-weight:700;display:flex}.option-item.correct{border-color:var(--success);background:#10b98126}.option-item.correct .option-key{background:var(--success);color:#fff}.option-item.incorrect{border-color:var(--error);background:#ef444426}.option-item.incorrect .option-key{background:var(--error);color:#fff}.feedback-box{border-left:4px solid;border-radius:1rem;margin-top:2rem;padding:2rem}.feedback-box.success{border-color:var(--success);background:#10b9811a}.feedback-box.error{border-color:var(--error);background:#ef44441a}.feedback-box h3{margin-bottom:.5rem}.stats-page{padding:2.5rem}.stats-header{justify-content:space-between;align-items:center;margin-bottom:2rem;display:flex}.stats-table-wrapper{overflow-x:auto}.stats-table{border-collapse:collapse;text-align:left;width:100%}.stats-table th,.stats-table td{border-bottom:1px solid #ffffff0d;padding:1.25rem}.stats-table th{color:var(--text-muted);font-size:.9rem;font-weight:600}.acc-cell{align-items:center;gap:1rem;display:flex}.acc-bar-bg{background:#ffffff1a;border-radius:4px;width:100px;height:8px;overflow:hidden}.acc-bar-fill{background:var(--primary);height:100%}.mt-4{margin-top:1.5rem}.btn-sm{padding:.5rem 1rem;font-size:.85rem}@media (width<=600px){.quiz-options{grid-template-columns:1fr}.stats-row{flex-direction:column;gap:1rem}}