:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f1f5f9;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    padding-top: 80px; /* 导航栏高度补偿 */
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.5rem;
}

.hero-section {
    min-height: 600px;
    background: linear-gradient(45deg, var(--accent-color), white);
}

.card {
    transition: transform 0.3s ease;
    border: none;
    border-radius: 15px;
}

.card:hover {
    transform: translateY(-5px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #1d4ed8);
    border: none;
    padding: 0.75rem 1.5rem;
}

.modal-content {
    border-radius: 15px;
}

@media (max-width: 768px) {
    .hero-section {
        min-height: 400px;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
}