/* 3D动态交互风格 - 柏坊灰蓝主题 */
:root {
    --primary-3d: #5a7d9a;
    --secondary-3d: #3a5168;
    --accent-3d: #6b8cae;
    --bg-3d: #f0f4f8;
    --text-3d: #2d3748;
    --shadow-3d: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 
                 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --transition-3d: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

body {
    background-color: var(--bg-3d);
    color: var(--text-3d);
    line-height: 1.7;
    perspective: 1000px;
    overflow-x: hidden;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(2deg); }
}

@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 3D导航栏 */
header {
    background: linear-gradient(135deg, var(--primary-3d), var(--secondary-3d));
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-3d);
    transform-style: preserve-3d;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo-3d {
    font-size: 1.8rem;
    font-weight: 700;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    transform: translateZ(20px);
    transition: var(--transition-3d);
}

.logo-3d:hover {
    transform: translateZ(30px) rotateY(10deg);
}

.nav-3d ul {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.nav-3d li {
    transform-style: preserve-3d;
    transition: var(--transition-3d);
}

.nav-3d a {
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-weight: 500;
    transition: var(--transition-3d);
    display: inline-block;
    transform: translateZ(10px);
}

.nav-3d a:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateZ(20px) scale(1.05);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

/* 3D卡片容器 */
.container-3d {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    transform-style: preserve-3d;
}

/* 3D浮动卡片 */
.card-3d {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-3d);
    transition: var(--transition-3d);
    transform: translateZ(0);
    position: relative;
    overflow: hidden;
}

.card-3d::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-3d), var(--accent-3d));
}

.card-3d:hover {
    transform: translateY(-5px) translateZ(10px) rotateY(5deg);
    box-shadow: 0 15px 30px -10px rgba(0, 0, 0, 0.2);
}

.section-title-3d {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-3d);
    position: relative;
    display: inline-block;
}

.section-title-3d::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--accent-3d);
    border-radius: 3px;
}

/* 3D网格布局 */
.grid-3d {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    transform-style: preserve-3d;
}

.article-card-3d {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-3d);
    transition: var(--transition-3d);
    transform: translateZ(0);
    position: relative;
}

.article-card-3d:hover {
    transform: translateY(-8px) rotateX(5deg) scale(1.02);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.15);
}

.article-card-3d::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary-3d);
}

.card-image-3d {
    width: 100%;
    height: 180px;
    object-fit: cover;
    transition: var(--transition-3d);
}

.article-card-3d:hover .card-image-3d {
    transform: scale(1.05);
}

.card-body-3d {
    padding: 1.5rem;
}

.card-title-3d {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    color: var(--text-3d);
    transition: var(--transition-3d);
}

.article-card-3d:hover .card-title-3d {
    color: var(--primary-3d);
}

.card-meta-3d {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #718096;
    margin-top: 1rem;
}

/* 3D分类标签 */
.category-tag-3d {
    display: inline-block;
    padding: 0.3rem 0.8rem;
    background: linear-gradient(135deg, var(--primary-3d), var(--accent-3d));
    color: white;
    border-radius: 50px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transform: translateZ(5px);
}

/* 3D文章详情 */
.article-detail-3d {
    max-width: 800px;
    margin: 0 auto;
    transform-style: preserve-3d;
}

.article-header-3d {
    margin-bottom: 2.5rem;
    text-align: center;
}

.article-title-3d {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-3d);
    line-height: 1.3;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.05);
}

.article-meta-3d {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    color: #718096;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.article-image-3d {
    width: 100%;
    max-height: 450px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-3d);
    transition: var(--transition-3d);
}

.article-image-3d:hover {
    transform: rotateY(10deg) scale(1.02);
}

.article-content-3d {
    line-height: 1.8;
    font-size: 1.1rem;
}

.article-content-3d p {
    margin-bottom: 1.5rem;
}

/* 3D分页导航 */
.pagination-3d {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 3rem;
}

.pagination-3d a {
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    background: white;
    color: var(--primary-3d);
    box-shadow: var(--shadow-3d);
    transition: var(--transition-3d);
    transform: translateZ(0);
}

.pagination-3d a:hover {
    background: var(--primary-3d);
    color: white;
    transform: translateY(-3px) translateZ(10px);
}

/* 3D友情链接 */
.friend-links-3d {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    margin: 3rem 0;
    box-shadow: var(--shadow-3d);
}

.friend-links-title-3d {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-3d);
}

.friend-links-container-3d {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.friend-link-3d {
    padding: 0.6rem 1.2rem;
    background: linear-gradient(135deg, #f0f4f8, #e2e8f0);
    border-radius: 50px;
    font-size: 0.9rem;
    transition: var(--transition-3d);
    transform: translateZ(0);
}

.friend-link-3d:hover {
    background: linear-gradient(135deg, var(--primary-3d), var(--accent-3d));
    color: white;
    transform: translateY(-3px) translateZ(10px);
}

/* 3D页脚 */
.footer-3d {
    background: linear-gradient(135deg, var(--primary-3d), var(--secondary-3d));
    padding: 2.5rem 0;
    text-align: center;
    margin-top: 4rem;
    color: white;
    position: relative;
    overflow: hidden;
}

.footer-3d::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--accent-3d), white);
}

.copyright-3d {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 3D动画效果 */
@keyframes rotate3d {
    0% { transform: rotateY(0deg); }
    100% { transform: rotateY(360deg); }
}

.hover-rotate {
    transition: var(--transition-3d);
}

.hover-rotate:hover {
    transform: rotateY(15deg);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .nav-3d ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .grid-3d {
        grid-template-columns: 1fr;
    }
    
    .article-title-3d {
        font-size: 1.8rem;
    }
    
    .article-meta-3d {
        gap: 1rem;
    }
}