:root{--color-primary: #ACE849;--color-primary-dark: #8BC934;--color-secondary: #2C2C2C;--color-gray: #C1C1C1;--color-light-gray: #F5F5F5;--color-white: #FFFFFF;--color-success: #4CAF50;--color-error: #E53935;--color-warning: #FF9800;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .1);--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-family);background-color:var(--color-light-gray);color:var(--color-secondary);line-height:1.6;min-height:100vh}.container{max-width:1200px;margin:0 auto;padding:0 20px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;font-size:16px;font-weight:600;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all .2s ease;text-decoration:none}.btn-primary{background-color:var(--color-primary);color:var(--color-secondary)}.btn-primary:hover{background-color:var(--color-primary-dark);transform:translateY(-1px)}.btn-secondary{background-color:var(--color-secondary);color:var(--color-white)}.btn-secondary:hover{background-color:#3d3d3d}.btn-outline{background-color:transparent;border:2px solid var(--color-secondary);color:var(--color-secondary)}.btn-outline:hover{background-color:var(--color-secondary);color:var(--color-white)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-lg{padding:16px 32px;font-size:18px}.card{background-color:var(--color-white);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:24px}.header{background-color:var(--color-secondary);padding:16px 0;position:sticky;top:0;z-index:100}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:12px;text-decoration:none}.logo-text{font-size:24px;font-weight:700;color:var(--color-white)}.logo-accent{color:var(--color-primary)}.progress-bar{width:100%;height:8px;background-color:var(--color-light-gray);border-radius:4px;overflow:hidden}.progress-fill{height:100%;background-color:var(--color-primary);transition:width .3s ease}.timer{display:flex;align-items:center;gap:8px;padding:8px 16px;background-color:var(--color-light-gray);border-radius:var(--radius-md);font-weight:600;font-size:18px}.timer.warning{background-color:#fff3e0;color:var(--color-warning)}.timer.danger{background-color:#ffebee;color:var(--color-error);animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.question-number{font-size:14px;color:var(--color-gray);margin-bottom:8px}.question-text{font-size:20px;font-weight:600;margin-bottom:24px;line-height:1.5}.options-list{display:flex;flex-direction:column;gap:12px}.option{display:flex;align-items:flex-start;padding:16px;background-color:var(--color-light-gray);border:2px solid transparent;border-radius:var(--radius-md);cursor:pointer;transition:all .2s ease}.option:hover,.option.selected{border-color:var(--color-primary);background-color:#f0fbe0}.option.correct{border-color:var(--color-success);background-color:#e8f5e9}.option.incorrect{border-color:var(--color-error);background-color:#ffebee}.option-letter{display:flex;align-items:center;justify-content:center;width:32px;height:32px;min-width:32px;background-color:var(--color-white);border-radius:50%;font-weight:600;margin-right:12px}.option.selected .option-letter{background-color:var(--color-primary);color:var(--color-secondary)}.option-text{flex:1;padding-top:4px}.question-nav{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px;padding-top:24px;border-top:1px solid var(--color-light-gray)}.nav-dot{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background-color:var(--color-light-gray);border:none;border-radius:50%;cursor:pointer;font-size:14px;font-weight:500;transition:all .2s ease}.nav-dot:hover{background-color:var(--color-gray)}.nav-dot.current{background-color:var(--color-primary);color:var(--color-secondary)}.nav-dot.answered{background-color:var(--color-secondary);color:var(--color-white)}.result-score{font-size:72px;font-weight:700;text-align:center;margin:24px 0}.result-score.pass{color:var(--color-success)}.result-score.fail{color:var(--color-error)}.result-details{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:16px;margin:24px 0}.result-stat{text-align:center;padding:16px;background-color:var(--color-light-gray);border-radius:var(--radius-md)}.stat-value{font-size:32px;font-weight:700}.stat-label{font-size:14px;color:var(--color-gray)}.explanation{margin-top:16px;padding:16px;background-color:#f0fbe0;border-left:4px solid var(--color-primary);border-radius:0 var(--radius-md) var(--radius-md) 0}.explanation-title{font-weight:600;margin-bottom:8px;color:var(--color-secondary)}.explanation-text{color:#555;line-height:1.6}@media (max-width: 768px){.question-text{font-size:18px}.btn-lg{padding:14px 24px;font-size:16px}.result-score{font-size:56px}}.hero{padding:80px 0;text-align:center;background:linear-gradient(135deg,var(--color-secondary) 0%,#1a1a1a 100%);color:var(--color-white)}.hero h1{font-size:48px;margin-bottom:16px}.hero h1 .accent{color:var(--color-primary)}.hero p{font-size:20px;color:var(--color-gray);max-width:600px;margin:0 auto 32px}.exam-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;padding:48px 0}.exam-card{background-color:var(--color-white);border-radius:var(--radius-lg);padding:32px;text-align:left;box-shadow:var(--shadow-lg);transition:transform .3s ease;position:relative;overflow:hidden}.exam-card:hover{transform:translateY(-4px)}.exam-card.locked{opacity:.7}.exam-badge{display:inline-block;padding:4px 12px;background-color:var(--color-primary);color:var(--color-secondary);border-radius:20px;font-size:12px;font-weight:600;margin-bottom:16px}.exam-card h3{font-size:24px;margin-bottom:12px}.exam-card p{color:var(--color-gray);margin-bottom:16px}.exam-info{display:flex;gap:24px;margin-bottom:24px;font-size:14px;color:var(--color-secondary)}.exam-info span{display:flex;align-items:center;gap:6px}.info-section{padding:48px 0;background-color:var(--color-white)}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:32px}.info-item{text-align:center;padding:24px}.info-icon{width:64px;height:64px;background-color:#f0fbe0;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:28px}.info-item h4{margin-bottom:8px}.info-item p{color:var(--color-gray);font-size:14px}.footer{background-color:var(--color-secondary);color:var(--color-gray);padding:32px 0;text-align:center}.footer a{color:var(--color-primary);text-decoration:none}.payment-container{min-height:80vh;display:flex;align-items:center;justify-content:center;padding:2rem}.payment-card{background:#2c2c2c;border-radius:16px;padding:3rem;max-width:500px;text-align:center;box-shadow:0 4px 20px #0000004d}.payment-card h1{color:#ace849;margin-bottom:1rem;font-size:1.8rem}.payment-description{color:#c1c1c1;margin-bottom:2rem;line-height:1.6}.payment-features{list-style:none;padding:0;margin:0 0 2rem;text-align:left}.payment-features li{color:#fff;padding:.5rem 0;border-bottom:1px solid #444}.payment-price{margin:2rem 0}.payment-price .price{font-size:3rem;font-weight:700;color:#ace849}.payment-price .price-label{display:block;color:#c1c1c1;font-size:.9rem;margin-top:.5rem}.payment-button{width:100%;padding:1rem 2rem;font-size:1.2rem;margin-top:1rem}.payment-button:disabled{opacity:.7;cursor:wait}.payment-error{color:#ff6b6b;margin:1rem 0}.payment-secure{color:#888;font-size:.85rem;margin-top:1.5rem}