:root{--navy: #0A1628;--navy-80: #1C2F47;--navy-60: #2E4866;--teal: #0D9488;--teal-light: #14B8A6;--teal-pale: #CCFBF1;--gold: #D97706;--gold-light: #FCD34D;--red: #DC2626;--red-light: #FEE2E2;--green: #16A34A;--green-light: #DCFCE7;--white: #FFFFFF;--gray-50: #F8FAFC;--gray-100: #F1F5F9;--gray-200: #E2E8F0;--gray-300: #CBD5E1;--gray-400: #94A3B8;--gray-500: #64748B;--gray-600: #475569;--gray-700: #334155;--gray-800: #1E293B;--gray-900: #0F172A;--font-display: "Fraunces", Georgia, serif;--font-body: "DM Sans", system-ui, sans-serif;--sidebar-w: 240px;--header-h: 64px;--shadow-sm: 0 1px 2px rgba(10,22,40,.06);--shadow-md: 0 4px 12px rgba(10,22,40,.08);--shadow-lg: 0 8px 24px rgba(10,22,40,.12);--radius-sm: 6px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased}body{font-family:var(--font-body);background:var(--gray-50);color:var(--navy);line-height:1.6;min-height:100vh}h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.2;color:var(--navy)}h1{font-size:clamp(2rem,4vw,3rem)}h2{font-size:clamp(1.5rem,3vw,2.25rem)}h3{font-size:1.25rem}h4{font-size:1rem}p{color:var(--gray-600)}a{color:var(--teal);text-decoration:none}a:hover{color:var(--teal-light)}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:var(--radius-sm);border:none;cursor:pointer;font-family:var(--font-body);font-size:14px;font-weight:500;transition:all .15s ease;white-space:nowrap}.btn-primary{background:var(--teal);color:#fff}.btn-primary:hover{background:var(--teal-light);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-navy{background:var(--navy);color:#fff}.btn-navy:hover{background:var(--navy-80)}.btn-outline{background:transparent;color:var(--navy);border:1.5px solid var(--gray-200)}.btn-outline:hover{border-color:var(--teal);color:var(--teal);background:var(--teal-pale)}.btn-ghost{background:transparent;color:var(--gray-600)}.btn-ghost:hover{background:var(--gray-100);color:var(--navy)}.btn-danger{background:var(--red-light);color:var(--red)}.btn-danger:hover{background:var(--red);color:#fff}.btn-lg{padding:14px 28px;font-size:15px;border-radius:var(--radius-md)}.btn-sm{padding:6px 14px;font-size:13px}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.card{background:#fff;border-radius:var(--radius-md);border:1px solid var(--gray-200);padding:24px;box-shadow:var(--shadow-sm)}.card-hover{transition:all .2s ease;cursor:pointer}.card-hover:hover{border-color:var(--teal);box-shadow:var(--shadow-md);transform:translateY(-2px)}.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:500}.badge-teal{background:var(--teal-pale);color:var(--teal)}.badge-navy{background:var(--navy);color:#fff}.badge-gold{background:#fef3c7;color:var(--gold)}.badge-red{background:var(--red-light);color:var(--red)}.badge-green{background:var(--green-light);color:var(--green)}.badge-gray{background:var(--gray-100);color:var(--gray-600)}.badge-easy{background:var(--green-light);color:var(--green)}.badge-medium{background:#fef3c7;color:#92400e}.badge-hard{background:var(--red-light);color:var(--red)}input,textarea,select{width:100%;padding:10px 14px;border:1.5px solid var(--gray-200);border-radius:var(--radius-sm);font-family:var(--font-body);font-size:14px;color:var(--navy);background:#fff;transition:border-color .15s;outline:none}input:focus,textarea:focus,select:focus{border-color:var(--teal)}input::placeholder,textarea::placeholder{color:var(--gray-400)}label{display:block;font-size:13px;font-weight:500;color:var(--gray-700);margin-bottom:6px}.form-group{margin-bottom:16px}.progress-bar{height:8px;background:var(--gray-200);border-radius:999px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--teal),var(--teal-light));border-radius:999px;transition:width .5s ease}.alert{padding:12px 16px;border-radius:var(--radius-sm);font-size:14px;display:flex;align-items:flex-start;gap:10px;border:1px solid}.alert-info{background:#eff6ff;border-color:#bfdbfe;color:#1e40af}.alert-success{background:var(--green-light);border-color:#bbf7d0;color:#15803d}.alert-warning{background:#fffbeb;border-color:#fde68a;color:#92400e}.alert-error{background:var(--red-light);border-color:#fecaca;color:#991b1b}.spinner{width:24px;height:24px;border:3px solid var(--gray-200);border-top-color:var(--teal);border-radius:50%;animation:spin .7s linear infinite;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.divider{border:none;border-top:1px solid var(--gray-200);margin:24px 0}.text-center{text-align:center}.text-right{text-align:right}.text-small{font-size:13px}.text-muted{color:var(--gray-500)}.text-teal{color:var(--teal)}.text-navy{color:var(--navy)}.text-red{color:var(--red)}.text-green{color:var(--green)}.text-gold{color:var(--gold)}.fw-600{font-weight:600}.flex{display:flex}.flex-center{display:flex;align-items:center;justify-content:center}.flex-between{display:flex;align-items:center;justify-content:space-between}.gap-4{gap:4px}.gap-8{gap:8px}.gap-12{gap:12px}.gap-16{gap:16px}.gap-24{gap:24px}.mt-8{margin-top:8px}.mt-16{margin-top:16px}.mt-24{margin-top:24px}.mb-8{margin-bottom:8px}.mb-16{margin-bottom:16px}.mb-24{margin-bottom:24px}.answer-option{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border:2px solid var(--gray-200);border-radius:var(--radius-sm);cursor:pointer;transition:all .15s ease;background:#fff;font-size:14px;line-height:1.5;text-align:left;width:100%;color:var(--navy)}.answer-option:hover:not(:disabled){border-color:var(--teal);background:var(--teal-pale)}.answer-option.selected{border-color:var(--navy);background:var(--gray-50)}.answer-option.correct{border-color:var(--green);background:var(--green-light);color:#15803d}.answer-option.incorrect{border-color:var(--red);background:var(--red-light);color:#991b1b}.answer-option.correct-highlight{border-color:var(--green);background:var(--green-light)}.answer-option:disabled{cursor:default}.option-letter{display:flex;align-items:center;justify-content:center;width:28px;height:28px;min-width:28px;border-radius:50%;background:var(--gray-100);font-weight:600;font-size:13px;color:var(--navy)}.answer-option.correct .option-letter{background:var(--green);color:#fff}.answer-option.incorrect .option-letter{background:var(--red);color:#fff}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--gray-100)}::-webkit-scrollbar-thumb{background:var(--gray-300);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--gray-400)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .25s ease}@keyframes slideIn{0%{transform:translate(-16px);opacity:0}to{transform:translate(0);opacity:1}}.slide-in{animation:slideIn .2s ease}@media print{body{background:#fff}}