/* 工业机械风全局样式 */
:root {
    --metal-dark: #1a1a1a;
    --metal-medium: #2d2d2d;
    --metal-light: #3d3d3d;
    --metal-accent: #4d4d4d;
    --rust-accent: #e74c3c;
    --text-primary: #e0e0e0;
    --text-secondary: #b3b3b3;
    --border-thick: 3px solid #555;
    --border-thin: 1px solid #444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Courier New', monospace;
}

body {
    background-color: var(--metal-dark);
    color: var(--text-primary);
    line-height: 1.6;
    letter-spacing: 0.5px;
}

a {
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.2s;
    border-bottom: 1px solid transparent;
}

a:hover {
    color: var(--rust-accent);
    border-bottom-color: var(--rust-accent);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 工业风头部样式 */
header {
    background-color: var(--metal-medium);
    padding: 15px 0;
    border-bottom: var(--border-thick);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--rust-accent);
    text-transform: uppercase;
    letter-spacing: 2px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 25px;
    position: relative;
}

nav ul li a {
    padding: 5px 0;
    font-weight: bold;
    text-transform: uppercase;
    font-size: 14px;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--rust-accent);
    transition: width 0.3s;
}

nav ul li a:hover::after {
    width: 100%;
}

/* 主要内容区域 - 机械面板风格 */
.main-content {
    background-color: var(--metal-medium);
    padding: 30px;
    margin: 30px 0;
    border: var(--border-thin);
    box-shadow: 0 0 0 1px var(--metal-accent);
}

.section-title {
    font-size: 22px;
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: var(--border-thin);
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--rust-accent);
    position: relative;
}

.section-title::before {
    content: '[ ';
    color: var(--text-secondary);
}

.section-title::after {
    content: ' ]';
    color: var(--text-secondary);
}

/* 工业风文章网格 */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.article-panel {
    background-color: var(--metal-light);
    border: var(--border-thin);
    padding: 20px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.article-panel:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    border-color: var(--rust-accent);
}

.article-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background-color: var(--rust-accent);
}

.panel-image {
    width: 100%;
    height: 160px;
    object-fit: cover;
    margin-bottom: 15px;
    border: var(--border-thin);
}

.panel-title {
    font-size: 18px;
    margin-bottom: 10px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.panel-meta {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 15px;
    border-top: var(--border-thin);
    padding-top: 10px;
}

/* 分类标签 */
.category-badge {
    display: inline-block;
    padding: 3px 8px;
    background-color: var(--metal-accent);
    color: var(--text-primary);
    font-size: 11px;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: var(--border-thin);
}

/* 文章详情页样式 */
.article-detail {
    max-width: 800px;
    margin: 0 auto;
}

.article-header {
    margin-bottom: 40px;
    border-bottom: var(--border-thin);
    padding-bottom: 20px;
}

.detail-title {
    font-size: 28px;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 1px;
    line-height: 1.3;
}

.detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.detail-meta span {
    display: flex;
    align-items: center;
}

.detail-meta svg {
    width: 14px;
    height: 14px;
    fill: var(--text-secondary);
    margin-right: 5px;
}

.detail-image {
    width: 100%;
    max-height: 400px;
    object-fit: cover;
    margin: 20px 0;
    border: var(--border-thin);
}

.article-body {
    line-height: 1.7;
    font-size: 16px;
}

.article-body p {
    margin-bottom: 20px;
}

.article-body img {
    max-width: 100%;
    height: auto;
    margin: 20px 0;
    border: var(--border-thin);
}

/* 分页导航 - 机械按钮风格 */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 40px;
}

.pagination a {
    padding: 10px 20px;
    margin: 0 5px;
    background-color: var(--metal-light);
    border: var(--border-thin);
    font-weight: bold;
    text-transform: uppercase;
    font-size: 14px;
    letter-spacing: 1px;
}

.pagination a:hover {
    background-color: var(--rust-accent);
    color: var(--text-primary);
    border-color: var(--rust-accent);
}

/* 工业风友情链接 */
.link-panel {
    background-color: var(--metal-medium);
    padding: 25px;
    margin: 30px 0;
    border: var(--border-thick);
}

.link-panel h3 {
    margin-bottom: 20px;
    color: var(--rust-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 18px;
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
}

.link-item {
    background-color: var(--metal-light);
    padding: 10px;
    border: var(--border-thin);
    text-align: center;
    transition: all 0.3s;
}

.link-item:hover {
    background-color: var(--rust-accent);
    transform: scale(1.05);
}

/* 机械风页脚 */
footer {
    background-color: var(--metal-medium);
    padding: 30px 0;
    text-align: center;
    margin-top: 50px;
    border-top: var(--border-thick);
}

.copyright {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    nav ul li {
        margin: 0 10px 10px 0;
    }
    
    .article-grid {
        grid-template-columns: 1fr;
    }
    
    .detail-title {
        font-size: 24px;
    }
    
    .link-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
}