* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --light: #f8fafc;
    --dark: #1e293b;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--info));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--info));
    color: white;
    box-shadow: var(--shadow-md);
}
/* Mobile Responsive cho toàn bộ site */
@media screen and (max-width: 768px) {
  .navbar .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  }
  
  .navbar .nav-menu.show {
    display: flex;
  }
  
  .navbar .nav-actions {
    display: none;
  }
  
  .menu-toggle {
    display: block !important;
  }
  
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
   */padding: 40px 20px;*/
  }

  .hero-title {
    font-size: 32px;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }
  
  .hero-actions {
    flex-direction: column;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-secondary {
    background: var(--gray-100);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-200);
}

.btn-warning {
    background: var(--warning);
    color: white;
}

.btn-warning:hover {
    background: #d97706;
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #0da271;
}

/* Navigation */
.navbar {
    background: white;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 800;
}

.brand-logo i {
    color: var(--primary);
    font-size: 28px;
}

.brand-highlight {
    color: var(--primary);
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
}

.nav-actions {
    display: flex;
    gap: 12px;
}

.btn-login, .btn-register {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-login {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

.btn-register {
    background: var(--primary);
    color: white;
    border: none;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--gray-600);
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: 80px 0;
    
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #10b981, #34d399);
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 48px;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--gray-600);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-label {
    color: var(--gray-600);
    font-size: 14px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.btn-start-exam {
    padding: 16px 32px;
    font-size: 18px;
}

.hero-image {
    position: relative;
}

.image-container {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.image-container img {
    width: 100%;
    height: auto;
    display: block;
}

.image-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.95);
    padding: 10px 16px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    backdrop-filter: blur(10px);
}

.image-badge i {
    color: var(--warning);
}

/* Features */
.features {
    padding: 80px 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    color: var(--gray-800);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--gray-100);
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 28px;
    color: var(--primary);
    box-shadow: var(--shadow-md);
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Exam Section */
.exam-section {
    padding: 40px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    min-height: 100vh;
}

.exam-header {
    background: white;
    padding: 24px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
}

.exam-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.exam-brand i {
    font-size: 32px;
    color: var(--primary);
}

.exam-brand h2 {
    font-size: 24px;
    color: var(--gray-800);
}

.exam-info {
    display: flex;
    gap: 32px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-600);
}

.info-item i {
    color: var(--primary);
}

.info-item strong {
    color: var(--gray-800);
    font-size: 18px;
}

/* Progress Bar */
.exam-progress {
    background: white;
    padding: 20px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
}

.progress-labels {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-weight: 500;
}

#progressPercentage {
    color: var(--primary);
    font-weight: 600;
}

.progress-bar {
    height: 10px;
    background: var(--gray-200);
    border-radius: 5px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--info));
    width: 4%;
    border-radius: 5px;
    transition: width 0.5s ease;
}

/* Question Card */
.question-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    box-shadow: var(--shadow-lg);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--gray-100);
}

.question-number {
    display: flex;
    align-items: center;
    gap: 12px;
}

.number-badge {
    background: var(--primary);
    color: white;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
}

.difficulty {
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty.easy {
    background: #dcfce7;
    color: #166534;
}

.difficulty.medium {
    background: #fef3c7;
    color: #92400e;
}

.difficulty.hard {
    background: #fee2e2;
    color: #991b1b;
}

.question-timer {
    background: var(--warning);
    color: white;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.question-content {
    margin-bottom: 40px;
}

#questionText {
    font-size: 16px;
    margin-bottom: 24px;
    line-height: 1.4;
    color: var(--gray-800);
}

.question-image {
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: 20px;
}

.question-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

/* Answers */
.answers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.answer-btn {
    background: var(--gray-100);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.answer-btn:hover {
    border-color: var(--primary);
    background: white;
    transform: translateY(-2px);
}

.answer-btn.selected {
    border-color: var(--primary);
    background: #dbeafe;
}

.answer-btn.correct {
    border-color: var(--success);
    background: #dcfce7;
}

.answer-btn.wrong {
    border-color: var(--danger);
    background: #fee2e2;
}

.answer-btn:before {
    content: attr(data-option);
    width: 32px;
    height: 32px;
    background: var(--gray-300);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--gray-700);
    flex-shrink: 0;
}

.answer-btn.selected:before,
.answer-btn.correct:before,
.answer-btn.wrong:before {
    color: white;
}

.answer-btn.selected:before {
    background: var(--primary);
}

.answer-btn.correct:before {
    background: var(--success);
}

.answer-btn.wrong:before {
    background: var(--danger);
}

/* Navigation */
.question-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    padding: 20px 0;
    border-top: 2px solid var(--gray-100);
    border-bottom: 2px solid var(--gray-100);
}

.nav-btn {
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--gray-100);
    border: 2px solid var(--gray-200);
    color: var(--gray-700);
    transition: all 0.3s;
}

.nav-btn:hover:not(:disabled) {
    background: var(--gray-200);
    border-color: var(--gray-300);
}

.nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.question-dots {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.question-dot {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--gray-100);
    border: 2px solid var(--gray-200);
    color: var(--gray-600);
}

.question-dot:hover {
    border-color: var(--primary);
    transform: scale(1.1);
}

.question-dot.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.question-dot.answered {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.question-dot.wrong {
    background: var(--danger);
    border-color: var(--danger);
    color: white;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 16px;
}

/* Quick Stats */
.quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.stat-box {
    background: white;
    padding: 20px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-md);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.stat-icon.correct {
    background: #dcfce7;
    color: var(--success);
}

.stat-icon.wrong {
    background: #fee2e2;
    color: var(--danger);
}

.stat-icon.marked {
    background: #fef3c7;
    color: var(--warning);
}

.stat-icon.remaining {
    background: #dbeafe;
    color: var(--primary);
}

.stat-content {
    flex: 1;
}

.stat-count {
    font-size: 32px;
    font-weight: 800;
    line-height: 1;
}

.stat-label {
    color: var(--gray-600);
    font-size: 14px;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
    opacity: 0;
    animation: fadeIn 0.3s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.modal-container {
    background: white;
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.4s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 24px 32px;
    border-bottom: 2px solid var(--gray-100);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--gray-800);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--gray-600);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s;
}

.modal-close:hover {
    background: var(--gray-100);
}

.modal-content {
    padding: 32px;
}

/* Score Display */
.score-display {
    text-align: center;
    margin-bottom: 40px;
}

.score-circle {
    position: relative;
    width: 160px;
    height: 160px;
    margin: 0 auto 24px;
}

.circle-progress {
    width: 100%;
    height: 100%;
    position: relative;
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.score-value {
    font-size: 48px;
    font-weight: 800;
    color: var(--primary);
}

.score-total {
    font-size: 24px;
    color: var(--gray-600);
}

.score-percentage {
    font-size: 20px;
    font-weight: 600;
    color: var(--success);
    margin-top: 8px;
}

.score-message h3 {
    font-size: 24px;
    margin-bottom: 8px;
    color: var(--gray-800);
}

.score-message p {
    color: var(--gray-600);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--gray-100);
    padding: 20px;
    border-radius: var(--radius-lg);
    text-align: center;
}

.stat-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
}

.stat-header h4 {
    color: var(--gray-700);
}

.stat-value {
    font-size: 32px;
    font-weight: 800;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.stat-label {
    color: var(--gray-600);
    font-size: 14px;
}

/* Result Details */
.result-details {
    background: var(--gray-100);
    padding: 24px;
    border-radius: var(--radius-lg);
    margin-bottom: 32px;
}

.result-details h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    color: var(--gray-800);
}

.details-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.detail-label {
    width: 150px;
    color: var(--gray-700);
    font-weight: 500;
}

.detail-bar {
    flex: 1;
    height: 8px;
    background: var(--gray-300);
    border-radius: 4px;
    overflow: hidden;
}

.detail-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--info));
    border-radius: 4px;
}

.detail-value {
    width: 50px;
    text-align: right;
    font-weight: 600;
    color: var(--primary);
}

/* Recommendations */
.recommendations {
    background: #f0f9ff;
    padding: 24px;
    border-radius: var(--radius-lg);
    margin-bottom: 32px;
}

.recommendations h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    color: var(--gray-800);
}

.recommendations ul {
    list-style: none;
    padding-left: 0;
}

.recommendations li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid #dbeafe;
}

.recommendations li:last-child {
    border-bottom: none;
}

.recommendations li i {
    color: var(--primary);
}

/* Modal Actions */
.modal-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: white;
    padding: 60px 0 30px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 20px;
}

.footer-logo i {
    color: var(--primary);
}

.footer-description {
    color: var(--gray-400);
    line-height: 1.6;
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--gray-700);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: background 0.3s;
}

.footer-social a:hover {
    background: var(--primary);
}

.footer-col h4 {
    color: white;
    margin-bottom: 20px;
    font-size: 18px;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: white;
}

.footer-links i {
    font-size: 12px;
    color: var(--primary);
}

.contact-info p {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    color: var(--gray-400);
}

.contact-info i {
    color: var(--primary);
    width: 20px;
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: 30px;
    text-align: center;
    color: var(--gray-400);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-legal a:hover {
    color: white;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-actions {
        display: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .exam-header {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .exam-info {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .question-header {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .question-navigation {
        flex-direction: column;
        gap: 20px;
    }
    
    .question-dots {
        order: -1;
    }
    
    .modal-actions {
        flex-direction: column;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}
/* Loading Spinner */
.loading-spinner-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.loading-spinner {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    font-size: 18px;
    color: var(--gray-600);
}

/* Error Container */
.error-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.error-content {
    text-align: center;
    padding: 48px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.error-icon {
    font-size: 64px;
    color: var(--danger);
    margin-bottom: 24px;
}

.error-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 16px;
}

.error-message {
    font-size: 16px;
    color: var(--gray-600);
    margin-bottom: 24px;
}

/* Page Wrapper */
.page-wrapper {
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .answers-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-stats {
        grid-template-columns: 1fr;
    }
}