/* WPS Office 官网 - 主样式文件 */

/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #e21e2d;
    --primary-dark: #c41826;
    --text-dark: #333;
    --text-light: #666;
    --text-muted: #999;
    --bg-light: #f5f5f5;
    --bg-white: #fff;
    --border-color: #e5e5e5;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 5px 20px rgba(0,0,0,0.15);
    --radius: 8px;
    --radius-lg: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background: var(--bg-white);
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

button {
    cursor: pointer;
    border: none;
    outline: none;
    font-family: inherit;
}

/* ===== 顶部导航 ===== */
.header {
    background: var(--bg-white);
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo img {
    height: 40px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 35px;
}

.nav-menu a {
    font-size: 0.95rem;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
}

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
}

/* 语言切换 */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s;
}

.lang-switch:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.lang-switch svg {
    width: 16px;
    height: 16px;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
    background: none;
}

.menu-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-dark);
    transition: all 0.3s;
}

/* ===== Hero 区域 ===== */
.hero {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    padding: 80px 20px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="60" cy="40" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="10" r="0.8" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    opacity: 0.5;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

/* 下载按钮 */
.download-btns {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 30px;
    background: var(--primary);
    color: #fff;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-download:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(226, 30, 45, 0.4);
}

.btn-download svg {
    width: 20px;
    height: 20px;
}

.btn-secondary {
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.25);
    box-shadow: none;
}

/* ===== 特性区域 ===== */
.features {
    padding: 80px 20px;
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 50px;
    color: var(--text-dark);
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

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

.feature-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary) 0%, #ff6b6b 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 35px;
    height: 35px;
    color: #fff;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-light);
}

/* ===== 文章区域 ===== */
.articles-section {
    padding: 80px 20px;
}

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

.articles-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.articles-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
}

.btn-more {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--primary);
    font-weight: 500;
    transition: gap 0.3s;
}

.btn-more:hover {
    gap: 10px;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 30px;
}

.article-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

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

.article-card a {
    display: block;
}

.article-cover {
    height: 200px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-size: cover;
    background-position: center;
    position: relative;
}

.article-cover::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.3));
}

.article-info {
    padding: 20px;
}

.article-info h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: var(--text-dark);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-info p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-date {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== 文章中心页 ===== */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 60px 20px;
    text-align: center;
    color: #fff;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

.articles-list {
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

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

.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
    opacity: 0.5;
}

/* ===== 文章详情页 ===== */
.article-detail {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 20px;
}

.article-detail .article-header {
    margin-bottom: 30px;
}

.article-detail .article-title {
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.3;
}

.article-detail .article-meta {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.article-detail .article-cover {
    width: 100%;
    height: 400px;
    margin-bottom: 30px;
    border-radius: var(--radius-lg);
}

.article-detail .article-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-dark);
}

.article-detail .article-content p {
    margin-bottom: 1em;
}

.article-detail .article-content img {
    max-width: 100%;
    border-radius: var(--radius);
    margin: 20px 0;
}

.article-detail .article-content ul,
.article-detail .article-content ol {
    margin: 1em 0;
    padding-left: 2em;
}

.article-detail .article-content li {
    margin-bottom: 0.5em;
    list-style: disc;
}

.article-detail .article-content ol li {
    list-style: decimal;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 40px;
    color: var(--primary);
    font-weight: 500;
}

/* ===== 页脚 ===== */
.footer {
    background: #1a1a2e;
    color: rgba(255,255,255,0.8);
    padding: 50px 20px 30px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-about h3 {
    font-size: 1.3rem;
    color: #fff;
    margin-bottom: 15px;
}

.footer-about p {
    font-size: 0.9rem;
    line-height: 1.6;
    opacity: 0.8;
}

.footer-links h4 {
    font-size: 1rem;
    color: #fff;
    margin-bottom: 20px;
}

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

.footer-links ul li a {
    font-size: 0.9rem;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.footer-links ul li a:hover {
    opacity: 1;
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 25px;
    text-align: center;
    font-size: 0.85rem;
    opacity: 0.6;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 20px;
        gap: 15px;
        box-shadow: var(--shadow);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .download-btns {
        flex-direction: column;
        align-items: center;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
    
    .article-detail .article-title {
        font-size: 1.6rem;
    }
    
    .article-detail .article-cover {
        height: 250px;
    }
}

/* ===== 数据统计区域 ===== */
.stats-section {
    background: linear-gradient(135deg, #e21e2d 0%, #ff6b6b 100%);
    padding: 60px 20px;
}

.stats-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
    color: #fff;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 10px;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* ===== 产品介绍区域 ===== */
.products-section {
    padding: 80px 20px;
    background: var(--bg-white);
}

.products-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    transition: all 0.3s;
}

.product-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.product-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.product-icon svg {
    width: 30px;
    height: 30px;
}

.product-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.product-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

.product-features {
    padding-left: 0;
}

.product-features li {
    font-size: 0.85rem;
    color: var(--text-light);
    padding: 8px 0;
    border-bottom: 1px dashed var(--border-color);
    list-style: none;
}

.product-features li:last-child {
    border-bottom: none;
}

.product-features li::before {
    content: "✓";
    color: var(--primary);
    margin-right: 8px;
    font-weight: bold;
}

/* ===== 用户评价区域 ===== */
.testimonials-section {
    padding: 80px 20px;
    background: var(--bg-light);
}

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

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow);
}

.testimonial-content {
    margin-bottom: 25px;
}

.testimonial-content p {
    font-size: 1rem;
    color: var(--text-dark);
    line-height: 1.7;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary) 0%, #ff6b6b 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
    font-weight: 700;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
}

.author-title {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== 常见问题区域 ===== */
.faq-section {
    padding: 60px 20px;
    background: var(--bg-white);
}

.faq-grid {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.faq-item {
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 25px;
}

.faq-item h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.faq-item p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ===== 响应式调整 ===== */
@media (max-width: 768px) {
    .stats-container {
        grid-template-columns: 1fr 1fr;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .articles-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
}

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

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

/* ===== 工具类 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 2rem;
}

.mb-4 {
    margin-bottom: 2rem;
}