/* 极简科技风CSS */
:root {
    --space-blue: #2a3a5e;
    --coral: #FF7F50;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #495057;
    --text-dark: #212529;
    --text-light: #6c757d;
    --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 15px rgba(0,0,0,0.1);
    --transition: all 0.25s cubic-bezier(0.645, 0.045, 0.355, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', sans-serif;
}

body {
    background-color: var(--light-gray);
    color: var(--text-dark);
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--space-blue);
    transition: var(--transition);
}

a:hover {
    color: var(--coral);
}

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

/* 3D悬浮导航 */
header {
    background-color: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

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

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--space-blue);
    display: flex;
    align-items: center;
}

.logo-icon {
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--coral);
    border-radius: 50%;
    margin-right: 10px;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-item {
    margin-left: 30px;
    position: relative;
}

.nav-link {
    padding: 8px 0;
    font-weight: 500;
    color: var(--dark-gray);
}

.nav-link:hover {
    color: var(--coral);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--coral);
    transition: var(--transition);
}

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

/* 内容区块 */
.content-section {
    padding: 60px 0;
}

.section-title {
    font-size: 32px;
    margin-bottom: 30px;
    color: var(--space-blue);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50px;
    height: 3px;
    background-color: var(--coral);
}

/* 极简卡片 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.card {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    position: relative;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background-color: var(--space-blue);
}

.card-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.card-body {
    padding: 25px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--space-blue);
}

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

.card-meta {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-light);
    padding-top: 15px;
    border-top: 1px solid var(--medium-gray);
}

/* 文章详情 */
.article-header {
    margin-bottom: 40px;
    text-align: center;
}

.article-title {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--space-blue);
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 20px;
    color: var(--text-light);
    margin-bottom: 30px;
}

.article-image {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-md);
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

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

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 50px;
}

.pagination-link {
    padding: 10px 20px;
    margin: 0 5px;
    border-radius: 6px;
    background-color: white;
    color: var(--space-blue);
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.pagination-link:hover {
    background-color: var(--space-blue);
    color: white;
}

/* 友情链接 */
.link-section {
    background-color: white;
    padding: 40px;
    border-radius: 8px;
    margin-top: 60px;
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 30px;
}

.link-item {
    padding: 12px;
    background-color: var(--light-gray);
    border-radius: 6px;
    text-align: center;
    font-size: 14px;
    transition: var(--transition);
}

.link-item:hover {
    background-color: var(--space-blue);
    color: white;
}

/* 页脚 */
footer {
    background-color: var(--space-blue);
    color: white;
    padding: 40px 0;
    margin-top: 60px;
}

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

.copyright {
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
    }
    
    .nav-menu {
        margin-top: 20px;
    }
    
    .nav-item {
        margin-left: 15px;
        margin-right: 15px;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .article-title {
        font-size: 28px;
    }
    
    .article-meta {
        flex-direction: column;
        gap: 10px;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
}

.card:nth-child(1) { animation-delay: 0.1s; }
.card:nth-child(2) { animation-delay: 0.2s; }
.card:nth-child(3) { animation-delay: 0.3s; }
.card:nth-child(4) { animation-delay: 0.4s; }