:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f5f5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    flex: 1;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

.card {
    border: none;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.15) !important;
}

.form-control, .form-select {
    border-radius: 0.5rem;
    border: 1px solid #ddd;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.btn {
    border-radius: 0.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.alert {
    border-radius: 0.5rem;
    border: none;
}

code {
    background-color: #f8f9fa;
    padding: 0.2rem 0.4rem;
    border-radius: 0.25rem;
    color: #d63384;
    font-size: 0.875rem;
}

footer {
    border-top: 1px solid #e9ecef;
    margin-top: auto;
}

.badge {
    padding: 0.35em 0.65em;
    font-size: 0.85em;
}

.list-unstyled li {
    padding: 0.5rem 0;
    font-size: 1.1rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0.5rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert {
    animation: fadeIn 0.3s ease;
}

/* 输入框焦点效果 */
.form-control:focus,
.form-select:focus {
    transform: scale(1.01);
}