/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #007AFF;
    --primary-hover: #0066CC;
    --text-color: #333333;
    --text-light: #666666;
    --bg-color: #ffffff;
    --bg-dark: #1a1a1a;
    --bg-light: #f5f5f5;
    --border-color: #e0e0e0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

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);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

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

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-small {
    padding: 8px 16px;
    font-size: 12px;
}

/* 导航栏 */
.navbar {
    background-color: var(--bg-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

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

.nav-brand a {
    font-size: 24px;
    font-weight: bold;
    color: var(--text-color);
}

.logo {
    background: linear-gradient(135deg, #007AFF, #00D4FF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-menu a {
    color: var(--text-color);
    font-weight: 500;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: all 0.3s;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero-title {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 18px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 40px;
}

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

/* 区块标题 */
.section-title {
    font-size: 36px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 50px;
    color: var(--text-color);
}

/* 核心特性 */
.features {
    padding: 80px 0;
    background-color: var(--bg-light);
}

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

.feature-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--text-light);
}

/* 版本对比 */
.comparison {
    padding: 80px 0;
}

.comparison-table {
    overflow-x: auto;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    box-shadow: var(--shadow);
    border-radius: 8px;
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background-color: var(--bg-light);
    font-weight: 600;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

.comparison-table tr:hover {
    background-color: var(--bg-light);
}

/* 客户端推荐 */
.clients {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.client-card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: all 0.3s;
}

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

.client-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.client-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
}

.client-card p {
    color: var(--text-light);
    margin-bottom: 20px;
}

/* 快速开始 */
.guide {
    padding: 80px 0;
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.step {
    text-align: center;
    padding: 30px;
    background: var(--bg-light);
    border-radius: 12px;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.step p {
    color: var(--text-light);
}

/* 常见问题 */
.faq {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 15px;
    box-shadow: var(--shadow);
}

.faq-question {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-color);
}

.faq-answer {
    color: var(--text-light);
    line-height: 1.8;
}

/* 页脚 */
.footer {
    background-color: var(--bg-dark);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
}

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

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

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* 下载页面 */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.page-title {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 15px;
}

.page-subtitle {
    font-size: 18px;
    opacity: 0.9;
}

.downloads {
    padding: 60px 0;
}

.platform-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
    justify-content: center;
}

.tab-button {
    padding: 12px 24px;
    background: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
}

.tab-button:hover {
    background: var(--border-color);
}

.tab-button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.platform-content {
    display: none;
}

.platform-content.active {
    display: block;
}

.download-list {
    max-width: 900px;
    margin: 0 auto;
}

.download-item {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 30px;
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    align-items: center;
}

.download-info h3 {
    font-size: 22px;
    margin-bottom: 8px;
}

.version {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
}

.description {
    color: var(--text-light);
    margin-bottom: 15px;
}

.features {
    list-style: none;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.features li {
    color: var(--text-light);
    font-size: 14px;
}

.download-buttons {
    display: flex;
    gap: 10px;
    align-items: center;
}

.badge {
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.badge-grey {
    background: #ccc;
    color: #666;
}

/* 安装指南 */
.install-guide {
    padding: 60px 0;
    background: var(--bg-light);
}

.guide-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    justify-content: center;
}

.guide-tab-button {
    padding: 10px 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s;
}

.guide-tab-button.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.guide-content {
    display: none;
    max-width: 800px;
    margin: 0 auto;
}

.guide-content.active {
    display: block;
}

.install-steps {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.install-steps li {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
}

.install-steps li:last-child {
    border-bottom: none;
}

.install-steps li::marker {
    font-weight: bold;
    color: var(--primary-color);
}

/* 404页面 */
.error-page {
    padding: 100px 0;
    min-height: 60vh;
}

.error-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.error-code {
    font-size: 120px;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 20px;
}

.error-title {
    font-size: 36px;
    margin-bottom: 15px;
}

.error-message {
    color: var(--text-light);
    font-size: 18px;
    margin-bottom: 30px;
}

.error-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 50px;
}

.error-help {
    text-align: left;
    background: var(--bg-light);
    padding: 30px;
    border-radius: 12px;
}

.error-help h3 {
    font-size: 18px;
    margin-bottom: 15px;
}

.error-help ul {
    list-style: none;
}

.error-help li {
    margin-bottom: 10px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 28px;
    }

    .features-grid,
    .clients-grid,
    .guide-steps {
        grid-template-columns: 1fr;
    }

    .download-item {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .download-buttons {
        justify-content: center;
    }

    .features {
        flex-direction: column;
        gap: 10px;
    }

    .error-code {
        font-size: 80px;
    }

    .error-title {
        font-size: 28px;
    }
}