/* GEO地质网站 - 主样式文件 */

:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --info-color: #17a2b8;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    
    --font-family: 'Microsoft YaHei', 'Segoe UI', Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    --border-radius: 0.25rem;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: #0056b3;
    text-decoration: underline;
}

/* 按钮 */
.btn {
    display: inline-block;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: var(--border-radius);
    transition: all 0.15s ease-in-out;
    cursor: pointer;
}

.btn-primary {
    color: #fff;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #0069d9;
    border-color: #0062cc;
}

.btn-secondary {
    color: #fff;
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-success {
    color: #fff;
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.btn-danger {
    color: #fff;
    background-color: var(--danger-color);
    border-color: var(--danger-color);
}

/* 卡片 */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0, 0, 0, 0.125);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: var(--spacing-lg);
}

.card-header {
    padding: 0.75rem 1.25rem;
    margin-bottom: 0;
    background-color: rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
}

.card-body {
    flex: 1 1 auto;
    padding: 1.25rem;
}

.card-footer {
    padding: 0.75rem 1.25rem;
    background-color: rgba(0, 0, 0, 0.03);
    border-top: 1px solid rgba(0, 0, 0, 0.125);
}

/* 导航栏 */
.navbar {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
}

.navbar-brand {
    display: inline-block;
    padding-top: 0.3125rem;
    padding-bottom: 0.3125rem;
    margin-right: 1rem;
    font-size: 1.25rem;
    line-height: inherit;
    white-space: nowrap;
}

.navbar-nav {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin-bottom: 0;
    list-style: none;
}

.nav-link {
    display: block;
    padding: 0.5rem 1rem;
}

/* 文章样式 */
.article-title {
    margin-bottom: var(--spacing-md);
    color: #212529;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    color: #6c757d;
    font-size: 0.875rem;
}

.article-meta span {
    margin-right: var(--spacing-md);
}

.article-meta i {
    margin-right: 0.25rem;
}

.article-content {
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.article-content h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid #e9ecef;
}

.article-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.article-content p {
    margin-bottom: var(--spacing-md);
}

.article-content ul, .article-content ol {
    margin-bottom: var(--spacing-md);
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: var(--spacing-sm);
}

.article-content blockquote {
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    background-color: #f8f9fa;
    border-left: 5px solid var(--primary-color);
    font-style: italic;
}

.article-content pre {
    background-color: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.article-content code {
    font-family: 'Courier New', monospace;
    background-color: #f8f9fa;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.875em;
}

/* 分类和标签 */
.category-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.category-item {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: #e9ecef;
    border-radius: 50rem;
    font-size: 0.875rem;
    color: #495057;
}

.category-item:hover {
    background-color: #dee2e6;
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag-item {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: #e9ecef;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    color: #495057;
    transition: all 0.3s ease;
}

.tag-item:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    :root {
        --font-size-base: 14px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: