:root {
    --primary-color: #0066CC;
    --secondary-color: #147CE5;
    --background-color: #ffffff;
    --text-color: #1d1d1f;
    --gray-light: #f5f5f7;
    --gray-dark: #86868b;
    --success-color: #34C759;
    --button-hover: #147CE5;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

/* 导航栏样式优化 */
header {
    padding: 20px 0;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

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

.logo img {
    height: 40px;
    width: auto;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 17px;
    font-weight: 400;
    letter-spacing: -.022em;
    transition: color 0.3s ease;
}

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

/* 主页英雄区域 */
.hero {
    text-align: center;
    padding: 120px 0 80px;
    max-width: 980px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 56px;
    line-height: 1.07143;
    font-weight: 600;
    letter-spacing: -.005em;
    margin-bottom: 20px;
    background: none;
    -webkit-background-clip: unset;
    -webkit-text-fill-color: var(--text-color);
}

.hero p {
    font-size: 28px;
    line-height: 1.10722;
    font-weight: 400;
    letter-spacing: .004em;
    color: var(--gray-dark);
    margin-bottom: 45px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 60px;
}

.hero-image {
    max-width: 800px;
    margin: 0 auto;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* 按钮样式优化 */
.download-btn {
    min-width: 180px;
    height: 48px;
    border-radius: 24px;
    font-size: 17px;
    line-height: 1.17648;
    font-weight: 400;
    letter-spacing: -.022em;
    padding: 0 30px;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    cursor: pointer;
}

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

.download-btn.secondary {
    background: var(--gray-light);
    color: var(--text-color);
}

.download-btn:hover {
    transform: translateY(-2px);
}

.download-btn.primary:hover {
    background: var(--button-hover);
}

.download-btn.secondary:hover {
    background: #e8e8ed;
}

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

/* 功能卡片 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 50px 0;
}

.feature-card {
    background: var(--gray-light);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease;
}

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

.feature-card i {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

/* 展示区域 */
.showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
    padding: 80px 0;
}

.showcase.reverse {
    direction: rtl;
}

.showcase.reverse .showcase-content {
    direction: ltr;
}

.showcase-content {
    padding: 0 20px;
}

.showcase-content h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.showcase-content p {
    color: var(--gray-dark);
    margin-bottom: 30px;
}

.showcase-features {
    list-style: none;
}

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

.showcase-features i {
    color: var(--success-color);
}

.showcase-image img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* 价格卡片 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 50px 0;
}

.pricing-card {
    background: var(--gray-light);
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    position: relative;
    transition: transform 0.3s ease;
}

.pricing-card.popular {
    background: white;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    transform: scale(1.05);
}

.pricing-card:hover {
    transform: translateY(-5px);
}

.pricing-card.popular:hover {
    transform: scale(1.05) translateY(-5px);
}

.popular-tag {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 14px;
}

.pricing-header {
    margin-bottom: 30px;
}

.pricing-header h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

.price {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
}

.price span {
    font-size: 16px;
    color: var(--gray-dark);
}

.pricing-features {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}

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

.pricing-features i {
    color: var(--success-color);
}

/* CTA 区域 */
.cta {
    text-align: center;
    padding: 80px 0;
    background: var(--gray-light);
    margin-top: 60px;
}

.cta h2 {
    font-size: 40px;
    line-height: 1.1;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-color);
}

.cta p {
    font-size: 21px;
    line-height: 1.2381;
    font-weight: 400;
    color: var(--gray-dark);
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta .download-btn {
    min-width: 160px;
    max-width: 200px;
    margin: 0 auto;
}

/* 页脚样式 */
.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    padding: 50px 0;
    border-top: 1px solid var(--gray-light);
}

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 18px;
}

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

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

.footer-section a {
    color: var(--gray-dark);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid var(--gray-light);
}

/* 响应式设计优化 */
@media (max-width: 991px) {
    .nav-links {
        gap: 20px;
    }

    .hero-buttons {
        gap: 15px;
    }

    .download-btn {
        min-width: 160px;
        font-size: 16px;
        padding: 0 25px;
    }
}

@media (max-width: 767px) {
    header {
        padding: 15px 0;
    }

    nav {
        flex-direction: column;
        gap: 15px;
        padding: 0 15px;
    }

    .nav-links {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: 15px;
    }

    .language-switch {
        margin-left: 10px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 15px;
        padding: 0 20px;
    }

    .download-btn {
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 575px) {
    .nav-links {
        gap: 12px;
    }

    .nav-links a {
        font-size: 15px;
    }

    .lang-btn {
        padding: 6px 12px;
        font-size: 13px;
    }

    .hero-buttons {
        padding: 0 15px;
    }

    .download-btn {
        height: 44px;
        font-size: 15px;
        padding: 0 20px;
    }
}

/* 暗色模式适配 */
@media (prefers-color-scheme: dark) {
    header {
        background-color: rgba(0, 0, 0, 0.8);
        border-bottom-color: rgba(255, 255, 255, 0.1);
    }

    .download-btn.secondary {
        background: rgba(255, 255, 255, 0.1);
    }

    .download-btn.secondary:hover {
        background: rgba(255, 255, 255, 0.15);
    }
}

/* 减少动画（如果用户开启了减少动画选项） */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* 语言切换按钮 */
.language-switch {
    margin-left: 20px;
    position: relative;
    z-index: 100;
}

.language-dropdown {
    position: relative;
    display: inline-block;
}

.lang-btn {
    background: var(--gray-light);
    border: none;
    padding: 8px 16px;
    border-radius: 18px;
    font-size: 14px;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

.lang-btn:hover {
    background: #e8e8ed;
    transform: translateY(-1px);
}

.language-dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: white;
    min-width: 160px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    border-radius: 8px;
    z-index: 1;
    margin-top: 5px;
}

.language-dropdown-content a {
    color: var(--text-color);
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    transition: all 0.3s ease;
}

.language-dropdown-content a:hover {
    background-color: var(--gray-light);
}

.language-dropdown:hover .language-dropdown-content {
    display: block;
}

@media (prefers-color-scheme: dark) {
    .lang-btn {
        background: rgba(255, 255, 255, 0.1);
        color: #ffffff;
    }
    
    .lang-btn:hover {
        background: rgba(255, 255, 255, 0.15);
    }

    .language-dropdown-content {
        background-color: #1a1a1a;
    }

    .language-dropdown-content a {
        color: #ffffff;
    }

    .language-dropdown-content a:hover {
        background-color: rgba(255, 255, 255, 0.1);
    }
}

/* 下载页面样式 */
.download-header {
    text-align: center;
    padding: 60px 0;
}

.download-title {
    font-size: 48px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.download-subtitle {
    font-size: 20px;
    color: var(--gray-dark);
    max-width: 600px;
    margin: 0 auto;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 20px 0 60px;
}

.app-card {
    background: white;
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid var(--gray-light);
}

.app-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.app-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
}

.app-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.app-card h2 {
    font-size: 24px;
    margin-bottom: 10px;
}

.version {
    color: var(--gray-dark);
    margin-bottom: 30px;
}

.app-features {
    text-align: left;
    margin-bottom: 30px;
}

.app-features h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.app-features ul {
    list-style: none;
    padding: 0;
}

.app-features li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
    color: var(--gray-dark);
}

.app-features li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 10px;
}

.download-btn {
    width: 100%;
    justify-content: center;
}

.download-btn.xl {
    padding: 15px 40px;
    font-size: 18px;
}

.download-all-section {
    text-align: center;
    padding: 60px 0;
    background: var(--gray-light);
    border-radius: 30px;
    margin: 40px 0;
}

.download-all-section h2 {
    font-size: 36px;
    margin-bottom: 15px;
}

.download-all-section p {
    color: var(--gray-dark);
    margin-bottom: 30px;
}

/* 响应式设计补充 */
@media (max-width: 768px) {
    .download-title {
        font-size: 36px;
    }
    
    .download-subtitle {
        font-size: 18px;
        padding: 0 20px;
    }
    
    .app-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .app-card {
        padding: 30px 20px;
    }
    
    .download-all-section {
        margin: 20px;
        padding: 40px 20px;
    }
    
    .download-all-section h2 {
        font-size: 28px;
    }
}

/* 详细功能展示 */
.detailed-features {
    padding: 80px 0;
    background: var(--gray-light);
    border-radius: 30px;
    margin: 40px 0;
}

.feature-block {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

.feature-block:not(:last-child) {
    margin-bottom: 60px;
}

.feature-block h2 {
    font-size: 36px;
    margin-bottom: 40px;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 20px;
    background: white;
    border-radius: 15px;
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.feature-item i {
    font-size: 24px;
    color: var(--primary-color);
    background: var(--gray-light);
    padding: 15px;
    border-radius: 12px;
}

.feature-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.feature-content p {
    color: var(--gray-dark);
    font-size: 16px;
    line-height: 1.5;
}

/* 响应式设计补充 */
@media (max-width: 768px) {
    .feature-block {
        padding: 20px;
    }
    
    .feature-block:not(:last-child) {
        margin-bottom: 30px;
    }
    
    .feature-block h2 {
        font-size: 28px;
        margin-bottom: 25px;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .feature-item {
        padding: 15px;
    }
    
    .feature-content h3 {
        font-size: 18px;
    }
    
    .feature-content p {
        font-size: 14px;
    }
}

/* 客户评价部分 */
.reviews {
    padding: 100px 0;
    background: var(--gray-light);
}

.reviews-header {
    text-align: center;
    margin-bottom: 60px;
    max-width: 800px;
    margin: 0 auto 60px;
    padding: 0 20px;
}

.reviews-header h2 {
    font-size: 48px;
    line-height: 1.08349;
    font-weight: 600;
    letter-spacing: -.003em;
    color: var(--text-color);
    margin-bottom: 20px;
}

.reviews-header p {
    font-size: 21px;
    line-height: 1.381;
    font-weight: 400;
    letter-spacing: .011em;
    color: var(--gray-dark);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 980px;
    margin: 0 auto;
    padding: 0 20px;
}

.review-card {
    background: var(--background-color);
    border-radius: 18px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

.review-content {
    font-size: 17px;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -.022em;
    color: var(--text-color);
    margin-bottom: 20px;
    position: relative;
}

.review-content:before {
    content: '"';
    font-size: 48px;
    line-height: 0;
    color: var(--primary-color);
    opacity: 0.2;
    position: absolute;
    top: 0;
    left: -10px;
}

.review-author {
    color: var(--gray-dark);
    font-size: 15px;
    font-weight: 500;
}

@media (max-width: 768px) {
    .reviews-header h2 {
        font-size: 36px;
    }
    
    .reviews-header p {
        font-size: 19px;
    }
    
    .reviews-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
    
    .review-card {
        padding: 24px;
    }
}

/* 帮助页面样式 */
.help-page {
    padding: 60px 0;
}

.help-header {
    text-align: center;
    margin-bottom: 60px;
}

.help-header h1 {
    font-size: 48px;
    line-height: 1.08349;
    font-weight: 600;
    letter-spacing: -.003em;
    color: var(--text-color);
    margin-bottom: 20px;
}

.help-header p {
    font-size: 21px;
    line-height: 1.381;
    font-weight: 400;
    letter-spacing: .011em;
    color: var(--gray-dark);
    max-width: 600px;
    margin: 0 auto;
}

.faq-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

.faq-container {
    display: grid;
    gap: 30px;
}

.faq-item {
    background: var(--gray-light);
    border-radius: 18px;
    padding: 30px;
    transition: all 0.3s ease;
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

.faq-item h2 {
    font-size: 24px;
    line-height: 1.16667;
    font-weight: 600;
    letter-spacing: .009em;
    color: var(--text-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.faq-content {
    color: var(--text-color);
}

.faq-content p {
    margin-bottom: 15px;
    font-size: 17px;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -.022em;
}

.faq-content p:last-child {
    margin-bottom: 0;
}

.faq-content i {
    color: var(--primary-color);
    margin-right: 8px;
}

/* 帮助页面响应式设计 */
@media (max-width: 768px) {
    .help-header h1 {
        font-size: 36px;
    }

    .help-header p {
        font-size: 18px;
    }

    .faq-item {
        padding: 25px;
    }

    .faq-item h2 {
        font-size: 20px;
    }

    .faq-content p {
        font-size: 16px;
    }
}

@media (max-width: 576px) {
    .help-header h1 {
        font-size: 32px;
    }

    .help-header p {
        font-size: 16px;
    }

    .faq-item {
        padding: 20px;
    }

    .faq-item h2 {
        font-size: 18px;
    }

    .faq-content p {
        font-size: 15px;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    .faq-item {
        background: var(--gray-light);
    }
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--gray-dark);
    text-decoration: none;
    transition: all 0.3s ease;
    padding: 8px 0;
}

.contact-link:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

.contact-link i {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

@media (prefers-color-scheme: dark) {
    .contact-link {
        color: rgba(255, 255, 255, 0.8);
    }
    
    .contact-link:hover {
        color: var(--primary-color);
    }
}

.project-section {
    margin-bottom: 60px;
    padding: 20px;
    background: var(--gray-light);
    border-radius: 30px;
}

.project-title {
    font-size: 36px;
    margin-bottom: 30px;
    padding: 0 20px;
    color: var(--text-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 20px 0;
    max-width: 900px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .project-section {
        margin-bottom: 30px;
        padding: 15px;
    }

    .project-title {
        font-size: 28px;
        margin-bottom: 20px;
        text-align: center;
    }

    .app-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
}