/* 现代主题样式 */
:root {
    --primary-color: #6f42c1;
    --secondary-color: #20c997;
    --text-color: #495057;
    --background-color: #e9ecef;
    --card-background: #ffffff;
    --header-background: #ffffff;
    --footer-background: #343a40;
    --container-width: 1200px;
}

body {
    font-family: 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)) !important;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.navbar-nav .nav-link {
    font-weight: 500;
    margin: 0 10px;
    position: relative;
}

.navbar-nav .nav-link:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: white;
    transition: width 0.3s ease;
}

.navbar-nav .nav-link:hover:after {
    width: 100%;
}

.card {
    border: none;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    margin-bottom: 2rem;
    background-color: var(--card-background);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card-body {
    padding: 25px;
}

.card-title {
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.card-title a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.card-title a:hover {
    color: var(--accent-color);
}

.card-text.text-muted {
    font-size: 0.9rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 30px;
    padding: 8px 20px;
    font-weight: 500;
    transition: transform 0.3s ease;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(108, 92, 231, 0.4);
}

.pagination {
    justify-content: center;
    margin: 30px 0;
}

.page-item .page-link {
    color: var(--primary-color);
    border: none;
    margin: 0 5px;
    border-radius: 50% !important;
    width: 40px;
    height: 40px;
    text-align: center;
    padding: 10px 0;
    transition: all 0.3s ease;
}

.page-item.active .page-link {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.page-item .page-link:hover {
    background-color: var(--secondary-color);
    color: white;
}

.footer {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 0;
    margin-top: 2rem;
}

.sidebar .card {
    border-left: 4px solid var(--accent-color);
}

.sidebar {
    background: var(--card-background);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.list-group-item {
    border: none;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.list-group-item:last-child {
    border-bottom: none;
}

.list-group-item a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.list-group-item a:hover {
    color: var(--accent-color);
}

.main-content {
    background: var(--card-background);
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

/* 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: 20px;
    }
    
    .navbar-nav .nav-link {
        margin: 5px 0;
        padding: 0.5rem 1rem;
    }
    
    .page-item .page-link {
        width: 35px;
        height: 35px;
        padding: 8px 0;
        font-size: 0.9rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .sidebar {
        padding: 1rem;
    }
}

@media (max-width: 576px) {
    .main-content {
        padding: 0.75rem;
    }
    
    .sidebar {
        padding: 0.75rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .card-body {
        padding: 15px;
    }
    
    .page-item .page-link {
        width: 30px;
        height: 30px;
        padding: 5px 0;
        font-size: 0.8rem;
    }
    
    .navbar-nav .nav-link {
        padding: 0.4rem 0.8rem;
    }
}