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

/* CSS变量定义 */
:root {
    --primary-color: #007AFF;
    --secondary-color: #5AC8FA;
    --accent-color: #FF9500;
    --success-color: #34C759;
    --warning-color: #FF9F0A;
    --error-color: #FF3B30;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #C6C6C6;
    --background-primary: #FFFFFF;
    --background-secondary: #F2F2F7;
    --background-tertiary: #EEEEEE;
    --border-color: #E5E5E7;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --border-radius-small: 8px;
    --border-radius-large: 16px;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --max-width: 1200px;
}

/* 基础样式 */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.nav-logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.logo-img {
    width: 40px;
    height: 40px;
    margin-right: 12px;
    border-radius: var(--border-radius-small);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-small);
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-item.active .nav-link {
    color: var(--primary-color);
    background-color: rgba(0, 122, 255, 0.1);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* 英雄区域样式 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 1;
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 4rem;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero-description {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.8;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #E6850A;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

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

.mockup-img {
    width: 100%;
    max-width: 400px;
    height: auto;
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow-medium);
}

/* 通用区域样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.2rem;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 功能特色样式 */
.features {
    padding: 80px 0;
    background-color: var(--background-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-large);
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 使用场景样式 */
.use-cases {
    padding: 80px 0;
    background-color: var(--background-primary);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.use-case {
    text-align: center;
    padding: 1.5rem;
}

.use-case-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.use-case h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.use-case p {
    color: var(--text-secondary);
}

/* 下载区域样式 */
.download {
    padding: 80px 0;
    background-color: var(--background-secondary);
    text-align: center;
}

.download-buttons {
    margin: 3rem 0;
}

.download-btn img {
    height: 60px;
    transition: transform 0.3s ease;
}

.download-btn:hover img {
    transform: scale(1.05);
}

.app-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.info-item {
    padding: 1rem;
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

/* 页脚样式 */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.footer-logo-img {
    width: 32px;
    height: 32px;
    margin-right: 8px;
    border-radius: var(--border-radius-small);
}

.footer-logo-text {
    font-size: 1.2rem;
    font-weight: 600;
}

.footer-description {
    color: var(--text-tertiary);
    margin-bottom: 1rem;
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-contact {
    list-style: none;
}

.footer-contact li {
    margin-bottom: 0.5rem;
    color: var(--text-tertiary);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 1rem;
    text-align: center;
    color: var(--text-tertiary);
}

/* 法律页面样式 */
.legal-page {
    padding: 100px 0 60px;
    background-color: var(--background-primary);
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.last-updated {
    color: var(--text-secondary);
    font-size: 1rem;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-section {
    margin-bottom: 3rem;
}

.legal-section h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.legal-section h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 1.5rem 0 1rem;
}

.legal-section p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.legal-section ul,
.legal-section ol {
    margin: 1rem 0 1rem 2rem;
    line-height: 1.8;
}

.legal-section li {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.contact-info {
    background-color: var(--background-secondary);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
}

.contact-item {
    margin-bottom: 1rem;
}

.contact-item:last-child {
    margin-bottom: 0;
}

.contact-item a {
    color: var(--primary-color);
    text-decoration: none;
}

.contact-item a:hover {
    text-decoration: underline;
}

/* 技术支持页面样式 */
.support-page {
    padding: 100px 0 60px;
    background-color: var(--background-primary);
}

.quick-help {
    margin-bottom: 4rem;
}

.help-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.help-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-large);
    text-align: center;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

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

.help-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.help-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.help-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.help-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

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

/* 使用指南样式 */
.user-guide {
    margin-bottom: 4rem;
}

.guide-section {
    margin-bottom: 3rem;
    background: var(--background-secondary);
    padding: 2rem;
    border-radius: var(--border-radius-large);
}

.guide-section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.guide-steps {
    display: grid;
    gap: 1.5rem;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.step-number {
    background: var(--primary-color);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.features-guide {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-guide {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.feature-guide h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-guide ul {
    margin-left: 1.5rem;
}

.feature-guide li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.premium-features {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.premium-features ul {
    margin-left: 1.5rem;
}

.premium-features li {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* FAQ样式 */
.faq {
    margin-bottom: 4rem;
}

.faq-list {
    space-y: 1rem;
}

.faq-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 1rem;
}

.faq-question {
    padding: 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--background-secondary);
    margin: 0;
    cursor: pointer;
    position: relative;
}

.faq-question::after {
    content: '+';
    position: absolute;
    right: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--primary-color);
}

.faq-answer {
    padding: 1.5rem;
    color: var(--text-primary);
}

.faq-answer p {
    margin-bottom: 1rem;
}

.faq-answer ul,
.faq-answer ol {
    margin: 1rem 0 1rem 2rem;
}

.faq-answer li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* 系统要求样式 */
.system-requirements {
    margin-bottom: 4rem;
}

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

.requirement-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-large);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-light);
}

.requirement-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.requirement-card ul {
    margin-left: 1.5rem;
}

.requirement-card li {
    margin-bottom: 0.8rem;
    color: var(--text-secondary);
}

/* 联系我们样式 */
.contact-section {
    margin-bottom: 4rem;
}

.contact-description {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-method {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-large);
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
}

.contact-method:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.contact-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.contact-method h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-method p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.contact-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.contact-link:hover {
    text-decoration: underline;
}

.contact-note {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    margin: 0;
}

.contact-tips {
    background: var(--background-secondary);
    padding: 2rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.contact-tips h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-tips ul {
    margin-left: 1.5rem;
}

.contact-tips li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .app-info {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .help-cards {
        grid-template-columns: 1fr;
    }
    
    .features-guide {
        grid-template-columns: 1fr;
    }
    
    .requirements-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-methods {
        grid-template-columns: 1fr;
    }
    
    .legal-content {
        padding: 0 1rem;
    }
    
    .step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
    
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .legal-section h2 {
        font-size: 1.5rem;
    }
    
    .faq-question {
        font-size: 1rem;
        padding: 1rem;
    }
    
    .faq-answer {
        padding: 1rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.help-card,
.contact-method {
    animation: fadeInUp 0.6s ease forwards;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* 选中文本样式 */
::selection {
    background-color: rgba(0, 122, 255, 0.2);
    color: var(--text-primary);
}

/* 链接样式 */
a {
    color: var(--primary-color);
    transition: color 0.3s ease;
}

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

/* 强调文本样式 */
strong {
    color: var(--text-primary);
    font-weight: 600;
}