/* 3D动态橙色主题 */
:root {
    --primary-color: #ff6b35;
    --secondary-color: #ff9e1b;
    --dark-color: #292a2d;
    --light-color: #f7f7f7;
    --text-color: #333;
    --accent-color: #ff3c00;
    --card-shadow: 0 10px 20px rgba(255, 107, 53, 0.2);
    --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background-color: var(--light-color);
    color: var(--text-color);
    line-height: 1.7;
    overflow-x: hidden;
}

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

/* 3D头部样式 */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 5px 15px rgba(255, 107, 53, 0.3);
    transform-style: preserve-3d;
}

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

.logo {
    font-size: 28px;
    font-weight: 800;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    transform: translateZ(20px);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 25px;
}

nav ul li {
    position: relative;
}

nav ul li a {
    color: white;
    font-weight: 600;
    padding: 8px 15px;
    border-radius: 30px;
    transition: var(--transition);
    display: block;
}

nav ul li a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 15px;
    width: 0;
    height: 3px;
    background-color: white;
    transition: var(--transition);
}

nav ul li a:hover::after {
    width: calc(100% - 30px);
}

/* 3D卡片容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
    perspective: 1000px;
}

.main-content {
    background-color: white;
    border-radius: 15px;
    padding: 30px;
    margin: 30px 0;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    transform-style: preserve-3d;
    position: relative;
}

.main-content:hover {
    transform: translateY(-10px) rotateX(5deg);
    box-shadow: 0 15px 30px rgba(255, 107, 53, 0.3);
}

.section-title {
    font-size: 26px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--primary-color);
    color: var(--dark-color);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--secondary-color);
}

/* 3D文章卡片 */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

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

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255,107,53,0.1), rgba(255,158,27,0.1));
    z-index: -1;
    transform: translateZ(-10px);
}

.article-card:hover {
    transform: translateY(-10px) rotateY(5deg);
    box-shadow: 0 15px 30px rgba(255, 107, 53, 0.4);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: var(--transition);
}

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

.card-body {
    padding: 20px;
    position: relative;
}

.card-title {
    font-size: 18px;
    margin-bottom: 12px;
    font-weight: 700;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--dark-color);
}

.card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    color: var(--primary-color);
    margin-top: 15px;
    font-weight: 500;
}

.category-tag {
    display: inline-block;
    padding: 5px 12px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 30px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 15px;
    transition: var(--transition);
}

.article-card:hover .category-tag {
    background-color: var(--accent-color);
    transform: translateY(-3px);
}

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

.article-header {
    margin-bottom: 40px;
    text-align: center;
    position: relative;
}

.article-title {
    font-size: 36px;
    margin-bottom: 20px;
    line-height: 1.3;
    color: var(--dark-color);
    text-shadow: 2px 2px 0 rgba(255,107,53,0.1);
    transform: translateZ(20px);
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 25px;
    color: var(--primary-color);
    margin-bottom: 25px;
    flex-wrap: wrap;
    font-weight: 500;
}

.article-image {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    transform-style: preserve-3d;
}

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

.article-content {
    line-height: 1.8;
    font-size: 18px;
    position: relative;
    transform-style: preserve-3d;
}

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

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 25px 0;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.article-content img:hover {
    transform: rotateX(5deg) scale(1.03);
}

/* 3D分页按钮 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 40px;
}

.pagination a {
    padding: 12px 25px;
    border-radius: 30px;
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 5px 15px rgba(255,107,53,0.3);
    transform-style: preserve-3d;
}

.pagination a:hover {
    background-color: var(--accent-color);
    transform: translateY(-5px) rotateY(10deg);
    box-shadow: 0 10px 20px rgba(255,60,0,0.3);
}

/* 3D友情链接 */
.friend-links {
    background-color: white;
    border-radius: 15px;
    padding: 25px;
    margin: 30px 0;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    transform-style: preserve-3d;
}

.friend-links:hover {
    transform: rotateX(5deg);
}

.friend-links h3 {
    margin-bottom: 20px;
    color: var(--dark-color);
    font-size: 22px;
}

.friend-links-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.friend-links-container a {
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.friend-links-container a:hover {
    background-color: var(--accent-color);
    transform: translateY(-3px) rotateY(5deg);
}

/* 3D页脚效果 */
footer {
    background: linear-gradient(135deg, var(--dark-color), #1a1a1a);
    padding: 30px 0;
    text-align: center;
    margin-top: 50px;
    position: relative;
    transform-style: preserve-3d;
}

footer::before {
    content: '';
    position: absolute;
    top: -10px;
    left: 0;
    width: 100%;
    height: 20px;
    background: linear-gradient(135deg, var(--primary-color), transparent);
    transform: translateZ(-10px);
}

.copyright {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    transform: translateZ(10px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    .article-grid {
        grid-template-columns: 1fr;
    }
    
    .article-title {
        font-size: 28px;
    }
    
    .article-meta {
        gap: 15px;
    }
    
    .pagination {
        flex-direction: column;
        align-items: center;
    }
}

/* 加载动画 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.main-content {
    animation: fadeIn 0.6s ease-out forwards;
}

.article-card {
    animation: fadeIn 0.6s ease-out forwards;
}

/* 悬浮动画 */
.float-element {
    animation: float 4s ease-in-out infinite;
}