*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background:linear-gradient(135deg,#0f0c29,#302b63 55%,#24243e);min-height:100vh;padding:40px 20px 60px;color:#2d3748}.card{background:#fff;border-radius:20px;padding:40px;max-width:740px;margin:0 auto;box-shadow:0 24px 80px rgba(0,0,0,.45);animation:fadeUp .35s ease both}@keyframes fadeUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.home-header{text-align:center;margin-bottom:40px}.home-header .hero-icon{font-size:70px;margin-bottom:14px}.home-header h1{font-size:26px;color:#1a1a2e;margin-bottom:8px}.home-header p{color:#718096;font-size:14px}.role-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:18px;gap:18px}.role-btn{background:linear-gradient(135deg,#667eea,#764ba2);border:none;border-radius:16px;padding:32px 20px;text-align:center;cursor:pointer;color:#fff;font-family:inherit;transition:transform .2s,box-shadow .2s}.role-btn:hover{transform:translateY(-4px);box-shadow:0 14px 40px rgba(102,126,234,.45)}.role-btn.teacher{background:linear-gradient(135deg,#f093fb,#f5576c)}.role-btn.teacher:hover{box-shadow:0 14px 40px rgba(245,87,108,.45)}.role-btn .ri{font-size:52px;margin-bottom:12px}.role-btn h2{font-size:20px;margin-bottom:5px}.role-btn p{font-size:13px;opacity:.85}.sec-title{text-align:center;margin-bottom:30px}.sec-title h2{font-size:22px;color:#1a1a2e;margin-bottom:6px}.sec-title p{color:#a0a0a0;font-size:13px}.form-group{margin-bottom:18px}.form-group label{display:block;font-weight:600;font-size:13px;color:#4a5568;margin-bottom:7px}.form-group input{width:100%;padding:12px 14px;border:2px solid #e2e8f0;border-radius:10px;font-size:15px;font-family:inherit;outline:none;transition:border-color .2s}.form-group input:focus{border-color:#667eea}.btn{padding:13px 26px;border-radius:10px;border:none;font-size:15px;font-weight:600;cursor:pointer;font-family:inherit;transition:opacity .2s,transform .15s}.btn:disabled{opacity:.65;cursor:not-allowed}.btn:not(:disabled):hover{opacity:.92;transform:translateY(-1px)}.btn-primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;width:100%}.btn-ghost{background:#f0f2f7;color:#4a5568}.btn-green{background:linear-gradient(135deg,#43e97b,#38f9d7);color:#1a1a2e}.btn-red{background:linear-gradient(135deg,#f093fb,#f5576c);color:#fff}.back-btn{background:none;border:none;cursor:pointer;color:#667eea;font-size:14px;font-family:inherit;padding:0;margin-bottom:22px;display:inline-flex;align-items:center;gap:5px}.back-btn:hover{text-decoration:underline}.alert{padding:11px 15px;border-radius:9px;font-size:13px;margin-bottom:14px}.alert-err{background:#fff0f2;color:#c0392b;border:1px solid #f5c6cb}.exam-meta{display:flex;justify-content:space-between;font-size:13px;color:#718096;margin-bottom:6px}.prog-bar{height:8px;background:#e2e8f0;border-radius:99px;margin-bottom:32px;overflow:hidden}.prog-fill{height:100%;background:linear-gradient(90deg,#667eea,#764ba2);border-radius:99px;transition:width .4s ease}.q-card{background:#f8f9ff;border:2px solid #e8eaf6;border-radius:14px;padding:22px;margin-bottom:18px}.q-num{font-size:11px;font-weight:700;color:#667eea;text-transform:uppercase;letter-spacing:.8px;margin-bottom:9px}.q-text{font-size:15px;font-weight:600;color:#1a1a2e;line-height:1.55;margin-bottom:16px}.opts{list-style:none;display:flex;flex-direction:column;gap:9px}.opt label{display:flex;align-items:flex-start;gap:11px;padding:11px 14px;border:2px solid #e0e0e0;border-radius:10px;cursor:pointer;background:#fff;font-size:14px;line-height:1.4;transition:border-color .15s,background .15s}.opt label:hover{border-color:#667eea;background:#f0f2ff}.opt input[type=radio]{width:16px;height:16px;accent-color:#667eea;flex-shrink:0;margin-top:2px}.opt.selected label{border-color:#667eea;background:#eef0ff}.score-wrap{text-align:center;padding:20px 0 28px}.score-circle{width:140px;height:140px;border-radius:50%;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 20px;color:#fff;box-shadow:0 12px 40px rgba(102,126,234,.35)}.score-num{font-size:48px;font-weight:700;line-height:1}.score-denom{font-size:16px;opacity:.8}.score-msg{font-size:22px;font-weight:700;color:#1a1a2e;margin-bottom:5px}.score-sub{color:#a0aec0;font-size:14px}.stats-row{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:14px;gap:14px;margin:24px 0}.stat-box{background:#f8f9ff;border-radius:12px;padding:16px;text-align:center}.stat-val{font-size:30px;font-weight:700;color:#667eea}.stat-lbl{font-size:12px;color:#a0aec0;margin-top:4px}.dash-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:22px;flex-wrap:wrap;gap:10px}.dash-head h2{font-size:22px;color:#1a1a2e}.dash-head p{color:#a0aec0;font-size:13px;margin-top:3px}.results-table{width:100%;border-collapse:collapse;font-size:13px;margin-bottom:22px}.results-table th{background:#f7f8fc;padding:11px 13px;text-align:left;font-weight:700;color:#718096;border-bottom:2px solid #e8eaf6;font-size:11px;text-transform:uppercase;letter-spacing:.6px}.results-table td{padding:11px 13px;border-bottom:1px solid #f0f0f5;color:#2d3748}.results-table tr:last-child td{border-bottom:none}.results-table tr:hover td{background:#fafbff}.badge{display:inline-block;padding:3px 10px;border-radius:99px;font-size:11px;font-weight:700}.badge-ok{background:#c6f6d5;color:#276749}.badge-fail{background:#fed7d7;color:#9b2c2c}.empty-state{text-align:center;padding:40px;color:silver}.empty-state .ei{font-size:52px;margin-bottom:12px}.action-row{display:flex;gap:12px;flex-wrap:wrap}.action-row .btn{flex:1 1;min-width:150px}.exam-timer{font-weight:700;font-size:15px;color:#667eea;background:#eef0ff;padding:4px 12px;border-radius:99px;letter-spacing:.5px;transition:background .4s,color .4s}.exam-timer--warn{color:#d97706;background:#fef3c7}.exam-timer--danger{color:#c53030;background:#fff5f5;animation:pulse-timer 1s ease-in-out infinite}@keyframes pulse-timer{0%,to{opacity:1}50%{opacity:.55}}@media (max-width:520px){.card{padding:24px 18px}.role-grid{grid-template-columns:1fr}.stats-row{grid-template-columns:1fr 1fr}.results-table{font-size:11px}.results-table td,.results-table th{padding:8px}}