/* 基础样式重置和变量定义 */
:root {
    /* 颜色变量 */
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --secondary-color: #2ecc71;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --gray-color: #95a5a6;
    --gray-light: #f5f6fa;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --text-color: #333;
    --text-light: #7f8c8d;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 20px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --transition: all 0.3s ease;
    --spacing: 2rem;
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 链接样式 */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

/* 按钮样式 */
.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: var(--dark-color);
    color: var(--white);
}

.btn-secondary:hover {
    background-color: #34495e;
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

/* 导航栏样式 */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    padding: 10px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-color);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--dark-color);
    font-weight: 500;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark-color);
    cursor: pointer;
}

/* 移动端导航菜单 */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background-color: var(--white);
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu.active {
    right: 0;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 20px;
    text-align: center;
}

.mobile-nav-link {
    color: var(--dark-color);
    font-size: 1.2rem;
    font-weight: 500;
}

/* 英雄区域样式 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1IiBoZWlnaHQ9IjUiPgo8cmVjdCB3aWR0aD0iNSIgaGVpZ2h0PSI1IiBmaWxsPSIjZmZmZmZmMTAiPjwvcmVjdD4KPHBhdGggZD0iTTAgNUw1IDBaTTYgNEw0IDZaTS0xIDFMMSAtMVoiIHN0cm9rZT0iI2ZmZmZmZjIwIiBzdHJva2Utd2lkdGg9IjEiPjwvcGF0aD4KPC9zdmc+');
    opacity: 0.5;
}

.hero-content {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 文章样式 */
.featured-articles,
.all-articles,
.categories,
.about,
.contact {
    padding: 100px 0;
}

.featured-articles {
    background-color: var(--gray-light);
}

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 50px;
    color: var(--dark-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
}

h2 {
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--dark-color);
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--primary-color);
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.article-card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.article-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.article-content {
    padding: 20px;
}

.article-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.category {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.8rem;
}

.article-title {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.article-title a {
    color: var(--dark-color);
}

.article-title a:hover {
    color: var(--primary-color);
}

.article-excerpt {
    margin-bottom: 20px;
    color: var(--text-light);
}

.read-more {
    display: inline-flex;
    align-items: center;
    font-weight: 500;
}

.read-more i {
    margin-left: 5px;
    transition: var(--transition);
}

.read-more:hover i {
    transform: translateX(5px);
}

/* 所有文章样式 */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.article-item {
    display: flex;
    gap: 20px;
    align-items: center;
    padding: 20px;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.article-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.article-item-image {
    width: 200px;
    height: 150px;
    object-fit: cover;
    border-radius: var(--border-radius);
}

.article-item-content {
    flex: 1;
}

.article-item-title {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.article-item-title a {
    color: var(--dark-color);
}

.article-item-title a:hover {
    color: var(--primary-color);
}

.article-item-excerpt {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 分页样式 */
.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 50px;
}

.page-link {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    border-radius: 50%;
    background-color: var(--white);
    color: var(--dark-color);
    font-weight: 500;
    transition: var(--transition);
}

.page-link:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

.page-link.current {
    background-color: var(--primary-color);
    color: var(--white);
}

.page-ellipsis {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    color: var(--text-light);
}

/* 分类样式 */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 30px 20px;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
}

.category-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
}

.category-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.category-name {
    font-size: 1.2rem;
    font-weight: 500;
    margin-bottom: 10px;
    color: var(--dark-color);
}

.category-count {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* 关于我样式 */
.about-content {
    display: flex;
    gap: 50px;
    align-items: center;
}

.about-image img {
    width: 300px;
    height: 300px;
    object-fit: cover;
    border-radius: 50%;
    border: 5px solid var(--white);
    box-shadow: var(--shadow);
}

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 20px;
    line-height: 1.8;
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--dark-color);
    color: var(--white);
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
}

/* 联系我样式 */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-form {
    background-color: var(--white);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--dark-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.contact-info {
    background-color: var(--gray-light);
    padding: 30px;
    border-radius: var(--border-radius);
}

.contact-info h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.contact-details {
    list-style: none;
    margin-bottom: 30px;
}

.contact-details li {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-details i {
    color: var(--primary-color);
}

.subscribe-input-group {
    display: flex;
    gap: 10px;
}

.subscribe-input-group input {
    flex: 1;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.subscribe-input-group button {
    white-space: nowrap;
}

/* 页脚样式 */
.footer {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 50px;
    margin-bottom: 50px;
}

.footer-logo .logo {
    color: var(--white);
    margin-bottom: 15px;
    display: inline-block;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
}

.footer-links h3,
.footer-categories h3,
.footer-social h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-links h3::after,
.footer-categories h3::after,
.footer-social h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-links ul,
.footer-categories ul {
    list-style: none;
}

.footer-links li,
.footer-categories li {
    margin-bottom: 10px;
}

.footer-links a,
.footer-categories a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-links a:hover,
.footer-categories a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-social .social-links {
    margin-top: 20px;
}

.footer-social .social-link {
    background-color: rgba(255, 255, 255, 0.1);
}

.footer-social .social-link:hover {
    background-color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
}

/* 文章详情页样式 */
.article-header {
    text-align: center;
    padding: 50px 0;
    background-color: var(--gray-light);
}

.article-header h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.article-header .article-meta {
    justify-content: center;
    margin-bottom: 30px;
}

.article-header-image {
    width: 100%;
    max-width: 800px;
    height: auto;
    border-radius: var(--border-radius);
    margin: 30px auto;
    display: block;
}

.article-body {
    padding: 60px 0;
    max-width: 800px;
    margin: 0 auto;
}

.article-body p {
    margin-bottom: 20px;
    line-height: 1.8;
}

.article-body h2 {
    margin-top: 40px;
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.article-body h3 {
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 1.5rem;
    color: var(--dark-color);
}

.article-body ul,
.article-body ol {
    margin-bottom: 20px;
    padding-left: 25px;
}

.article-body li {
    margin-bottom: 10px;
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    margin: 20px 0;
    display: block;
}

.article-tags {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.article-tags .tag {
    display: inline-block;
    padding: 5px 15px;
    background-color: var(--gray-light);
    color: var(--dark-color);
    border-radius: 50px;
    font-size: 0.9rem;
    margin-right: 10px;
    margin-bottom: 10px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .about-content {
        flex-direction: column;
        text-align: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .nav-links {
        display: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .article-item {
        flex-direction: column;
        text-align: center;
    }
    
    .article-item-image {
        width: 100%;
        max-width: 300px;
    }
    
    .about-image img {
        width: 200px;
        height: 200px;
    }
    
    .subscribe-input-group {
        flex-direction: column;
    }
}

@media (max-width: 576px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
    }
    
    .article-grid {
        grid-template-columns: 1fr;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }
}

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

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.delay-1 {
    animation-delay: 0.1s;
}

.delay-2 {
    animation-delay: 0.2s;
}

.delay-3 {
    animation-delay: 0.3s;
}

/* 打印样式 */
@media print {
    .navbar,
    .mobile-menu,
    .hero-buttons,
    .pagination,
    .footer,
    .back-to-top {
        display: none;
    }
    
    body {
        font-size: 12pt;
        color: #000;
    }
    
    a {
        text-decoration: none;
        color: #000;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0066cc;
        --primary-dark: #0052a3;
        --dark-color: #000000;
        --light-color: #ffffff;
        --text-color: #000000;
        --text-light: #333333;
    }
}

/* 减少动画偏好支持 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}