/* CRO/CDMO博客 - 专业商务蓝金配色方案 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a365d;
    --primary-hover: #2c5282;
    --secondary-color: #c9a227;
    --accent-color: #d4af37;
    --background-color: #f7fafc;
    --surface-color: #ffffff;
    --surface-hover: #edf2f7;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --border-color: #e2e8f0;
    --gradient-primary: linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
    --gradient-accent: linear-gradient(135deg, #c9a227 0%, #d4af37 100%);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(26,54,93,0.15);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
}

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

/* 导航栏 - 专业商务风格 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--gradient-primary);
    border-bottom: 3px solid var(--secondary-color);
    z-index: 1000;
    padding: 14px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
}

.logo-icon {
    font-size: 1.6rem;
}

.nav-links {
    display: flex;
    gap: 28px;
    list-style: none;
}

.nav-links a {
    color: #e2e8f0;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: var(--secondary-color);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

/* 英雄区域 */
.hero {
    padding: 140px 0 80px;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23c9a227' fill-opacity='0.08'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero .container {
    position: relative;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    color: white;
}

.hero .subtitle {
    font-size: 1.15rem;
    color: #e2e8f0;
    max-width: 600px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 30px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: white;
}

.stat-icon {
    font-size: 2rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: #a0aec0;
}

/* 分类导航区 */
.categories-section {
    padding: 60px 0;
    background: var(--surface-color);
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 60px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

/* 分类网格 */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

/* 分类卡片 - 商务风格 */
.category-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    display: block;
    position: relative;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

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

.category-header {
    padding: 24px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    gap: 16px;
}

.category-icon {
    font-size: 2rem;
}

.category-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: white;
}

.category-body {
    padding: 20px 24px;
}

.category-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.category-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
    margin-top: 16px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* 文章区域 */
.articles-section {
    padding: 60px 0;
    background: var(--background-color);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
}

/* 文章卡片 */
.article-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    display: block;
}

.article-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.article-image {
    height: 160px;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.article-content {
    padding: 20px;
}

.article-category {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(26,54,93,0.1);
    color: var(--primary-color);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.article-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.article-excerpt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

/* 外链区域 - 商务风格 */
.external-links {
    padding: 50px 0;
    background: var(--gradient-primary);
}

.external-links-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: white;
    margin-bottom: 24px;
    text-align: center;
}

.links-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.link-item {
    padding: 8px 16px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 4px;
    color: white;
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.link-item:hover {
    background: rgba(255,255,255,0.2);
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

/* 文本外链区域 */
.text-links-section {
    padding: 40px 0;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
}

.text-links-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.text-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.text-link-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.3s ease;
}

.text-link-item:hover {
    color: var(--primary-color);
}

/* 页脚 */
.footer {
    padding: 40px 0;
    background: var(--gradient-primary);
    border-top: 3px solid var(--secondary-color);
}

.footer-content {
    text-align: center;
    color: white;
    font-size: 0.95rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 16px;
}

.footer-links a {
    color: #e2e8f0;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

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

/* 面包屑 */
.breadcrumb {
    padding: 12px 0;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.breadcrumb-item {
    color: var(--text-secondary);
}

.breadcrumb-item a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb-separator {
    color: var(--text-muted);
}

/* 文章页 */
.article-page {
    padding: 80px 0 60px;
}

.article-hero {
    text-align: center;
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 40px;
}

.category-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.article-hero h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 24px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 32px 0 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--secondary-color);
}

.article-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 24px 0 12px;
}

.article-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.article-content blockquote {
    background: var(--surface-hover);
    border-left: 4px solid var(--secondary-color);
    padding: 20px 24px;
    margin: 32px 0;
    font-style: italic;
    color: var(--text-primary);
}

/* 相关文章 */
.related-articles {
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.related-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.related-card {
    display: block;
    padding: 20px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.3s ease;
}

.related-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.related-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.related-card-category {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* 响应式 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }

    .nav-links {
        display: none;
    }

    .categories-grid,
    .articles-grid {
        grid-template-columns: 1fr;
    }
}

/* 动画 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}