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

:root {
    --primary-color: #1e88e5;
    --secondary-color: #0d47a1;
    --accent-color: #ff9800;
    --text-color: #333;
    --light-text: #666;
    --lighter-text: #999;
    --bg-color: #fff;
    --light-bg: #f5f7fa;
    --border-color: #e0e0e0;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --danger-color: #f44336;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

/* 排版 */
h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
    margin-top: 2rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
}

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

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

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    gap: 0.5rem;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* 头部 */
.header {
    background-color: var(--bg-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo img {
    height: 50px;
    width: auto;
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav a {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

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

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

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

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 4px 0;
    transition: var(--transition);
}

/* 主横幅 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 4rem 0;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 3rem;
}

.hero-content {
    flex: 1;
}

.hero h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.download-note {
    font-size: 0.9rem;
    opacity: 0.8;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

/* 功能区域 */
.features {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.feature-icon {
    margin-bottom: 1.5rem;
}

.feature-icon img {
    width: 48px;
    height: 48px;
}

/* 下载区域 */
.download-section {
    padding: 4rem 0;
}

.download-section h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.download-option {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
}

.download-option h3 {
    margin-bottom: 1rem;
}

.download-option .btn {
    margin: 1.5rem 0;
    width: 100%;
}

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

/* 新闻预览 */
.news-preview {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.view-all {
    font-weight: 500;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.news-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.news-date {
    color: var(--light-text);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.news-card h3 {
    margin-bottom: 1rem;
}

.news-card h3 a:hover {
    color: var(--secondary-color);
}

/* 页脚 */
.footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
}

.footer a:hover {
    color: white;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo img {
    margin-bottom: 1rem;
}

.footer-logo p {
    opacity: 0.8;
}

.footer-column h4 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.8;
}

.disclaimer {
    font-size: 0.8rem;
    margin-top: 0.5rem;
    opacity: 0.7;
}

/* 通用页面样式 */
.page-container {
    padding: 3rem 0;
}

.page-title {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

/* 教程页面样式 */
.tutorial-steps {
    margin: 3rem 0;
}

.step {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--light-bg);
    border-radius: 10px;
}

.step-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
}

.step-content h3 {
    margin-top: 0;
}

.important-box {
    background: #fff8e1;
    border-left: 4px solid var(--warning-color);
    padding: 1rem;
    margin: 1rem 0;
}

.warning-box {
    background: #ffebee;
    border-left: 4px solid var(--danger-color);
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 0 8px 8px 0;
}

/* 新闻页面样式 */
.news-filter {
    margin: 2rem 0;
}

.filter-options {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    background: var(--light-bg);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

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

.news-list {
    margin: 2rem 0;
}

.news-item {
    display: flex;
    gap: 2rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
}

.news-date {
    flex-shrink: 0;
    width: 80px;
    text-align: center;
}

.news-date .day {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.news-date .month {
    display: block;
    font-size: 1rem;
    color: var(--light-text);
}

.news-category {
    display: inline-block;
    padding: 0.25rem 1rem;
    background: var(--light-bg);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.news-excerpt {
    color: var(--light-text);
    margin: 1rem 0;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--lighter-text);
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 3rem;
}

.page-link {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

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

/* 新闻详情页样式 */
.news-detail-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.news-meta {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--light-text);
}

.news-subtitle {
    font-size: 1.2rem;
    color: var(--light-text);
    margin-top: 0.5rem;
}

.news-content {
    line-height: 1.8;
}

.news-content h2, .news-content h3 {
    margin-top: 2rem;
}

.news-content ul, .news-content ol {
    margin: 1rem 0 1rem 2rem;
}

.news-tags {
    margin: 2rem 0;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.news-tags a {
    display: inline-block;
    padding: 0.25rem 1rem;
    background: var(--light-bg);
    border-radius: 20px;
    margin: 0.25rem;
    font-size: 0.9rem;
}

.news-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
}

/* 关于我们页面样式 */
.timeline {
    position: relative;
    margin: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--primary-color);
}

.timeline-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    position: relative;
}

.timeline-date {
    flex-shrink: 0;
    width: 100px;
    text-align: right;
    font-weight: bold;
    color: var(--primary-color);
}

.timeline-content {
    flex: 1;
    padding-left: 2rem;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.value-card {
    padding: 1.5rem;
    background: var(--light-bg);
    border-radius: 10px;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

/* 网站地图样式 */
.sitemap-sections {
    display: grid;
    gap: 3rem;
    margin: 2rem 0;
}

.sitemap-list {
    list-style: none;
    margin-top: 1rem;
}

.sitemap-list li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
}

.sitemap-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.contact-info-box {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 10px;
    margin-top: 3rem;
}

/* 响应式设计 */
@media (max-width: 992px) {
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .download-buttons {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .nav {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: white;
        padding: 1rem;
        box-shadow: var(--shadow);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav ul {
        flex-direction: column;
        gap: 1rem;
    }
    
    .step {
        flex-direction: column;
        gap: 1rem;
    }
    
    .step-number {
        align-self: flex-start;
    }
    
    .news-item {
        flex-direction: column;
        gap: 1rem;
    }
    
    .news-date {
        width: auto;
        text-align: left;
    }
    
    .news-date .day {
        display: inline;
        font-size: 1rem;
        margin-right: 0.5rem;
    }
    
    .news-date .month {
        display: inline;
    }
    
    .news-navigation {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .download-buttons {
        flex-direction: column;
    }
    
    .features-grid,
    .download-options,
    .news-grid {
        grid-template-columns: 1fr;
    }
}

/* 页脚样式 */
.footer {
    background: linear-gradient(135deg, #0d47a1 0%, #1a237e 100%);
    color: rgba(255, 255, 255, 0.9);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section {
    display: flex;
    flex-direction: column;
}

.footer-logo img {
    margin-bottom: 1rem;
    filter: brightness(0) invert(1);
}

.footer-tagline {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: white;
}

.footer-description {
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 2rem;
    opacity: 0.8;
}

.footer-download h4 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.download-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.download-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    color: white;
    transition: all 0.3s ease;
}

.download-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(5px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.link-group h4 {
    color: white;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.link-group h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: #4fc3f7;
}

.link-group ul {
    list-style: none;
}

.link-group li {
    margin-bottom: 0.75rem;
}

.link-group a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
    transition: all 0.3s ease;
    display: inline-block;
}

.link-group a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-contact h4 {
    color: white;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-contact h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: #4fc3f7;
}

.contact-info {
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.contact-item img {
    margin-top: 0.25rem;
    filter: brightness(0) invert(1);
    opacity: 0.8;
}

.contact-item strong {
    display: block;
    color: white;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.contact-item p {
    font-size: 0.9rem;
    opacity: 0.8;
}

.social-links h4 {
    color: white;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.social-icons {
    display: flex;
    gap: 1rem;
}

.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all 0.3s ease;
}

.social-icons a:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.social-icons img {
    filter: brightness(0) invert(1);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.legal-links {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.legal-links a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.85rem;
    transition: color 0.3s ease;
}

.legal-links a:hover {
    color: white;
}

.legal-links span {
    opacity: 0.5;
}

.security-notice {
    max-width: 400px;
    background: rgba(255, 193, 7, 0.1);
    border-left: 3px solid #ffc107;
    padding: 0.75rem 1rem;
    border-radius: 0 4px 4px 0;
}

.security-notice p {
    font-size: 0.85rem;
    line-height: 1.4;
    margin: 0;
}

.security-notice strong {
    color: #ffc107;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .footer-content {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
        gap: 2rem;
    }
    
    .footer-section {
        grid-column: 1 / -1;
        grid-row: 1;
    }
    
    .footer-links {
        grid-column: 1;
        grid-row: 2;
    }
    
    .footer-contact {
        grid-column: 2;
        grid-row: 2;
    }
}

@media (max-width: 768px) {
    .footer {
        padding: 3rem 0 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }
    
    .footer-section {
        grid-column: 1;
        grid-row: 1;
    }
    
    .footer-links {
        grid-column: 1;
        grid-row: 2;
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-contact {
        grid-column: 1;
        grid-row: 3;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
    
    .security-notice {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .legal-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem 1rem;
    }
    
    .social-icons {
        justify-content: center;
    }
}