/* 经典主题样式 */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --text-color: #212529;
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --header-background: #343a40;
    --footer-background: #343a40;
    --container-width: 1200px;
}

body {
    font-family: Georgia, serif;
    background-color: #f5f5f5;
    color: #444;
    line-height: 1.6;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background-color: #2c3e50 !important;
    box-shadow: 0 2px 4px rgba(0,0,0,.1);
}

.navbar-brand {
    font-family: 'Times New Roman', Times, serif;
    font-style: italic;
    font-weight: bold;
}

.card {
    border: 1px solid #ddd;
    border-radius: 0;
    margin-bottom: 2rem;
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.card-header {
    background-color: #f8f9fa;
    border-bottom: 1px solid #ddd;
    font-weight: bold;
}

.card-title {
    font-family: Georgia, serif;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.card-title a {
    color: #2c3e50;
    text-decoration: none;
}

.card-title a:hover {
    color: #3498db;
    text-decoration: underline;
}

.btn-primary {
    background-color: #3498db;
    border-color: #3498db;
}

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
}

.pagination {
    justify-content: center;
}

.page-item .page-link {
    color: #3498db;
    border-radius: 0 !important;
}

.page-item.active .page-link {
    background-color: #3498db;
    border-color: #3498db;
}

.footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 2rem 0;
    margin-top: 2rem;
}

.sidebar {
    background: #fff;
    border: 1px solid #ddd;
    padding: 1.5rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.sidebar .card {
    border-left: 3px solid #3498db;
}

.list-group-item a {
    color: #2c3e50;
    text-decoration: none;
}

.list-group-item a:hover {
    color: #3498db;
    text-decoration: underline;
}

.main-content {
    background: #fff;
    border: 1px solid #ddd;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* 验证码样式 */
.captcha-image {
    border: 1px solid #ddd;
    border-radius: 4px;
    height: 38px;
    width: 120px;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .container {
        max-width: 100%;
        padding: 0 15px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .card-body {
        padding: 15px;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .sidebar {
        padding: 1rem;
    }
    
    .navbar-nav .nav-link {
        padding: 0.5rem 1rem;
    }
}

@media (max-width: 576px) {
    .main-content {
        padding: 0.75rem;
    }
    
    .sidebar {
        padding: 0.75rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .card-title {
        font-size: 1.25rem;
    }
}