/* ========================================
   纯黑奢华风格 - SEO 站群系统前台模板
   高端、极简、视觉冲击
   ======================================== */

:root {
    /* 纯黑配色方案 */
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #111111;
    --bg-card: #0f0f0f;
    --bg-hover: #1a1a1a;
    
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    
    --accent-gold: #d4af37;        /* 香槟金 */
    --accent-gold-light: #f4cf57;
    --accent-silver: #c0c0c0;      /* 银灰色 */
    --accent-bronze: #cd7f32;      /* 古铜色 */
    
    --border-color: #1f1f1f;
    --border-light: #2a2a2a;
    --border-accent: rgba(212, 175, 55, 0.3);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.5);
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.7);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.9);
    --shadow-glow: 0 0 20px rgba(212, 175, 55, 0.3);
    
    --radius: 4px;
    --radius-lg: 8px;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    
    --font-sans: 'Noto Sans SC', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.8;
    font-size: 16px;
    overflow-x: hidden;
}

/* 背景遮罩层 */
.bg-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(212, 175, 55, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(212, 175, 55, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ========================================
   顶部导航栏
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.site-header.scrolled {
    background: rgba(0, 0, 0, 0.98);
    border-bottom-color: var(--border-accent);
    box-shadow: var(--shadow-lg);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-section {
    flex-shrink: 0;
}

.main-logo {
    text-decoration: none;
    display: block;
}

.logo-text {
    font-size: 32px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
    transition: var(--transition);
}

.main-logo:hover .logo-text {
    filter: brightness(1.2);
}

.site-slogan {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 6px;
    letter-spacing: 1px;
}

.main-navigation {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    position: relative;
    padding: 10px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    transition: var(--transition);
    border-radius: var(--radius);
}

.nav-item::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
    transition: var(--transition);
}

.nav-item:hover,
.nav-item.active {
    color: var(--text-primary);
    background: rgba(212, 175, 55, 0.05);
}

.nav-item:hover::before,
.nav-item.active::before {
    width: 80%;
}

/* ========================================
   主内容区
   ======================================== */
.main-content {
    max-width: 1400px;
    margin: 120px auto 60px;
    padding: 0 40px;
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 60px;
}

.content-wrapper {
    min-width: 0;
}

/* ========================================
   文章卡片网格
   ======================================== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
}

.article-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.1), transparent);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
}

.article-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-accent);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.article-card:hover::before {
    opacity: 1;
}

.card-image {
    position: relative;
    width: 100%;
    height: 220px;
    overflow: hidden;
}

.card-image a {
    display: block;
    width: 100%;
    height: 100%;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.article-card:hover .card-image img {
    transform: scale(1.1);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.8) 100%);
    opacity: 0;
    transition: var(--transition);
}

.article-card:hover .image-overlay {
    opacity: 1;
}

.card-body {
    padding: 24px;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 12px;
}

.category-tag {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-bronze));
    color: var(--bg-primary);
    padding: 4px 12px;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 0.5px;
}

.date-tag {
    color: var(--text-muted);
    font-family: monospace;
}

.card-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 12px;
}

.card-title a {
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

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

.card-excerpt {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 20px;
    border-top: 1px solid var(--border-light);
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-gold);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition);
}

.read-more:hover {
    gap: 12px;
    color: var(--accent-gold-light);
}

.view-count {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 12px;
}

/* ========================================
   侧边栏
   ======================================== */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.widget {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: var(--transition);
}

.widget:hover {
    border-color: var(--border-accent);
    box-shadow: var(--shadow-glow);
}

.widget-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-accent);
    display: flex;
    align-items: center;
    gap: 8px;
}

.title-icon {
    font-size: 18px;
}

.hot-list,
.new-list {
    list-style: none;
}

.hot-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

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

.hot-item:hover .hot-title {
    color: var(--accent-gold);
}

.rank {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-bronze));
    color: var(--bg-primary);
    font-size: 12px;
    font-weight: 700;
    border-radius: var(--radius);
    flex-shrink: 0;
}

.hot-title {
    flex: 1;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    transition: var(--transition);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.hot-views {
    color: var(--text-muted);
    font-size: 11px;
    white-space: nowrap;
}

.new-item {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

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

.new-item:hover .new-title {
    color: var(--accent-gold);
}

.new-title {
    flex: 1;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.5;
    transition: var(--transition);
}

.new-date {
    color: var(--text-muted);
    font-size: 12px;
    white-space: nowrap;
    font-family: monospace;
}

/* ========================================
   分页
   ======================================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.page-btn {
    padding: 12px 28px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.page-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-accent);
    color: var(--text-primary);
    box-shadow: var(--shadow-glow);
}

.page-info {
    color: var(--text-muted);
    font-size: 14px;
    font-family: monospace;
}

/* ========================================
   页脚
   ======================================== */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 60px 40px;
    margin-top: 80px;
}

/* ========================================
   分类页头部
   ======================================== */
.category-hero {
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
    border-bottom: 1px solid var(--border-accent);
    padding: 80px 40px 60px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.category-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.05) 0%, transparent 70%);
    animation: rotate 30s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 48px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    letter-spacing: 3px;
}

.hero-desc {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 24px;
    line-height: 1.8;
}

.hero-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 14px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.footer-content p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-gold);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .sidebar {
        order: -1;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 16px 20px;
    }
    
    .logo-text {
        font-size: 24px;
    }
    
    .main-navigation {
        display: none;
    }
    
    .main-content {
        margin-top: 80px;
        padding: 0 20px;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   文章详情页
   ======================================== */
.article-page {
    margin-top: 100px;
}

.article-detail {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 60px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.article-detail:hover {
    border-color: var(--border-accent);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.article-detail-header {
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 2px solid var(--border-accent);
}

.detail-category {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-bronze));
    color: var(--bg-primary);
    padding: 6px 16px;
    border-radius: var(--radius);
    font-size: 12px;
    font-weight: 700;
    text-decoration: none;
    margin-bottom: 20px;
    transition: var(--transition);
}

.detail-category:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.detail-title {
    font-size: 42px;
    font-weight: 900;
    line-height: 1.3;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.detail-meta {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.detail-date,
.detail-views {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 14px;
}

.article-detail-content {
    font-size: 17px;
    line-height: 2;
    color: var(--text-primary);
}

.article-detail-content p {
    margin-bottom: 24px;
}

.article-detail-content h2,
.article-detail-content h3,
.article-detail-content h4 {
    margin-top: 48px;
    margin-bottom: 24px;
    color: var(--accent-gold);
}

.article-tags {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
}

.tags-label {
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
}

.tags-list {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.tag-item {
    background: rgba(212, 175, 55, 0.1);
    color: var(--accent-gold);
    padding: 6px 14px;
    border-radius: var(--radius);
    font-size: 13px;
    border: 1px solid rgba(212, 175, 55, 0.2);
}

.article-footer-nav {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.article-nav-link {
    display: block;
    padding: 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    text-decoration: none;
    transition: var(--transition);
}

.article-nav-link:hover {
    border-color: var(--border-accent);
    background: var(--bg-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.nav-label {
    display: block;
    color: var(--text-muted);
    font-size: 12px;
    margin-bottom: 8px;
}

.nav-title {
    display: block;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 600;
    line-height: 1.5;
}