/* 全局样式 */
:root {
    --primary-color: #2a2a2a;
    --secondary-color: #1a1a1a;
    --text-color: #e0e0e0;
    --text-muted: #b0b0b0;
    --accent-color: #007bff;
    --max-width: 800px;
    --vh: 1vh; /* 动态视口高度 */
    --safe-area-inset-top: env(safe-area-inset-top);
    --safe-area-inset-right: env(safe-area-inset-right);
    --safe-area-inset-bottom: env(safe-area-inset-bottom);
    --safe-area-inset-left: env(safe-area-inset-left);
}

body {
    font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--secondary-color);
    margin: 0;
    padding: 0;
    /* 改善移动端滚动性能 */
    -webkit-overflow-scrolling: touch;
    scroll-behavior: smooth;
    /* 支持安全区域 */
    padding-left: var(--safe-area-inset-left);
    padding-right: var(--safe-area-inset-right);
}

/* 移动端性能优化 */
* {
    /* 减少重绘和回流 */
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

/* 改善文本渲染 */
body, .btn, .nav-link {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* 导航栏样式 */
.navbar {
    background-color: var(--primary-color);
    padding: 1rem 0;
    transition: background-color 0.3s ease;
}

.navbar.scrolled {
    background-color: rgba(42, 42, 42, 0.95);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: bold;
    color: var(--text-color) !important;
    font-size: 1.5rem;
}

.nav-link {
    color: var(--text-color) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--accent-color) !important;
}

/* 自定义汉堡菜单图标 */
.navbar-toggler {
    border: none;
    padding: 0.25rem 0.5rem;
    background: transparent;
}

.navbar-toggler:focus {
    box-shadow: 0 0 0 2px var(--accent-color);
}

.navbar-toggler-icon {
    background-image: none;
    width: 24px;
    height: 18px;
    position: relative;
    display: inline-block;
}

.navbar-toggler-icon::before,
.navbar-toggler-icon::after,
.navbar-toggler-icon {
    background-color: var(--text-color);
    height: 2px;
    border-radius: 1px;
    transition: all 0.3s ease;
}

.navbar-toggler-icon::before,
.navbar-toggler-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
}

.navbar-toggler-icon::before {
    top: -6px;
}

.navbar-toggler-icon::after {
    bottom: -6px;
}

/* 汉堡菜单动画 */
.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
    background-color: transparent;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::before {
    transform: rotate(45deg);
    top: 0;
}

.navbar-toggler[aria-expanded="true"] .navbar-toggler-icon::after {
    transform: rotate(-45deg);
    bottom: 0;
}

/* 主要内容区域 */
main {
    padding-top: 76px;
}

.content-wrapper {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* 首页Banner - 产品展示 */
.hero-section {
    min-height: calc(var(--vh, 1vh) * 100 - 76px);
    display: flex;
    align-items: center;
    padding: 4rem 0;
    /* 支持安全区域 */
    padding-top: max(4rem, var(--safe-area-inset-top));
}

.hero-product-showcase {
    width: 100%;
    min-height: 70vh;
}

.hero-product-showcase .row {
    min-height: 70vh;
    align-items: center;
}

.hero-product-info {
    padding: 2rem 2rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-product-title {
    margin-bottom: 1rem;
    text-align: left;
}

.hero-main-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    line-height: 1.0;
    letter-spacing: -0.03em;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(135deg, var(--text-color) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub-title {
    font-size: 1.4rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0;
    line-height: 1.2;
    letter-spacing: -0.01em;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    opacity: 0.9;
}

.hero-product-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.6;
    font-weight: 400;
    text-align: left;
    max-width: 90%;
}

.hero-platform-support {
    margin-bottom: 0;
}

.hero-platform-support p {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
}

.hero-platform-icons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: flex-start;
}

.hero-platform-icon {
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.1) 0%, rgba(0, 123, 255, 0.2) 100%);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid rgba(0, 123, 255, 0.3);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.hero-platform-icon:hover {
    background: linear-gradient(135deg, var(--accent-color) 0%, #0056b3 100%);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

.hero-platform-note {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    margin-bottom: 0;
    opacity: 0.7;
    font-style: italic;
    text-align: left;
}



.hero-download-section {
    text-align: center;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 123, 255, 0.05) 0%, rgba(0, 123, 255, 0.1) 100%);
    border-radius: 20px;
    border: 1px solid rgba(0, 123, 255, 0.1);
    backdrop-filter: blur(10px);
}

/* Hero区域App Store徽章 */
.hero-app-store-badge {
    margin-bottom: 2rem;
}

.hero-app-store-link {
    display: inline-block;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.hero-app-store-link:hover {
    transform: scale(1.05);
}

.hero-app-store-badge-official {
    display: flex;
    align-items: center;
    background: #000000;
    color: white;
    padding: 16px 28px;
    border-radius: 15px;
    border: 1px solid #333;
    transition: all 0.3s ease;
    min-width: 260px;
    justify-content: flex-start;
    gap: 18px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.hero-app-store-badge-official:hover {
    background: #1a1a1a;
    border-color: #555;
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.6);
}

.hero-apple-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.hero-apple-logo svg {
    width: 24px;
    height: 28px;
}

.hero-badge-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1;
}

.hero-download-text-small {
    font-size: 13px;
    color: #ffffff;
    margin-bottom: 3px;
    font-weight: 400;
    opacity: 0.9;
    letter-spacing: 0.3px;
}

.hero-app-store-text-large {
    font-size: 24px;
    font-weight: 600;
    color: white;
    line-height: 1;
    letter-spacing: -0.5px;
}

.hero-cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    align-items: center;
}

.hero-cta-buttons .btn {
    padding: 12px 24px;
    font-size: 0.95rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.hero-cta-buttons .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

/* 按钮样式 */
.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.75rem 2rem;
    font-weight: 500;
    border-radius: 4px;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
}

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

.btn-outline:hover {
    background-color: var(--text-color);
    color: var(--secondary-color);
}

/* 章节样式 */
.section {
    padding: 5rem 0;
}

.section h2 {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 2rem;
    color: var(--text-color);
    text-align: center;
}

.section .lead {
    font-size: 1.25rem;
    color: var(--text-muted);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.bg-alt {
    background-color: var(--primary-color);
}

/* 特性卡片 */
.feature-card {
    text-align: center;
    padding: 2rem;
    height: 100%;
    transition: transform 0.3s ease;
}

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

.feature-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

/* 产品展示样式 */
.product-showcase {
    margin-top: 2rem;
}

.product-info {
    padding: 2rem 0;
}

.product-title {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    line-height: 1.3;
}

.product-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.features-list {
    margin-bottom: 2rem;
}

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

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

.features-list li {
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.5;
}

.features-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
    font-size: 1.1rem;
}

.platform-support {
    margin-bottom: 2rem;
}

.platform-support p {
    color: var(--text-color);
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.platform-icons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.platform-icon {
    background: rgba(255, 255, 255, 0.1);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    color: var(--text-color);
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.platform-icon:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    transform: translateY(-2px);
}

.free-version-note {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-style: italic;
    margin-bottom: 0;
}

.product-download {
    text-align: center;
    padding: 2rem;
}

/* App Store徽章样式 */
.app-store-badge {
    margin-bottom: 1rem;
}

.app-store-link {
    display: inline-block;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.app-store-link:hover {
    transform: scale(1.05);
}

/* 官方App Store徽章样式 */
.app-store-badge-official {
    display: flex;
    align-items: center;
    background: #000000;
    color: white;
    padding: 10px 18px;
    border-radius: 8px;
    border: 1px solid #333;
    transition: all 0.3s ease;
    min-width: 200px;
    justify-content: flex-start;
    gap: 12px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.app-store-badge-official:hover {
    background: #1a1a1a;
    border-color: #555;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.apple-logo {
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.apple-logo svg {
    width: 20px;
    height: 24px;
}

.badge-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1;
}

.download-text-small {
    font-size: 11px;
    color: #ffffff;
    margin-bottom: 2px;
    font-weight: 400;
    opacity: 0.9;
}

.app-store-text-large {
    font-size: 20px;
    font-weight: 600;
    color: white;
    line-height: 1;
}

.download-text {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
}

/* 联系我们 */
.contact-info {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

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

.contact-info strong {
    color: var(--text-color);
}

/* 页脚 */
footer {
    background-color: var(--primary-color);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-content p {
    margin: 0;
    color: var(--text-muted);
}

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

.footer-links a:hover {
    color: var(--accent-color);
}

/* 响应式调整 */

/* 大平板 (768px - 991px) */
@media (max-width: 991px) {
    .content-wrapper {
        padding: 1.5rem 1rem;
    }

    .hero-section {
        padding: 3rem 0;
    }

    .section {
        padding: 4rem 0;
    }
}

/* 小平板和大手机 (576px - 767px) */
@media (max-width: 767px) {
    /* 导航栏优化 */
    .navbar {
        padding: 0.75rem 0;
    }

    .navbar-brand {
        font-size: 1.25rem;
    }

    .navbar-toggler {
        border: none;
        padding: 0.25rem 0.5rem;
    }

    .navbar-toggler:focus {
        box-shadow: none;
    }

    .navbar-collapse {
        margin-top: 1rem;
        padding-top: 1rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-item {
        margin: 0.25rem 0;
    }

    .nav-link {
        padding: 0.75rem 1rem !important;
        border-radius: 4px;
        text-align: center;
    }

    .nav-link:hover {
        background-color: rgba(255, 255, 255, 0.1);
    }

    /* 主要内容调整 */
    main {
        padding-top: 70px;
    }

    .content-wrapper {
        padding: 1.5rem 0.75rem;
    }

    /* Hero区域优化 */
    .hero-section {
        min-height: calc(100vh - 70px);
        padding: 2rem 0;
    }

    .hero-product-showcase .row {
        min-height: auto;
        flex-direction: column;
    }

    .hero-product-info {
        padding: 1.5rem 1rem;
        text-align: center;
        max-width: 100%;
    }

    .hero-download-section {
        margin-top: 1.5rem;
        padding: 1.5rem 1rem;
        background: linear-gradient(135deg, rgba(0, 123, 255, 0.03) 0%, rgba(0, 123, 255, 0.08) 100%);
    }

    .hero-product-title {
        margin-bottom: 1rem;
        text-align: center;
    }

    .hero-main-title {
        font-size: 2.5rem;
        margin-bottom: 0.3rem;
        line-height: 1.0;
    }

    .hero-sub-title {
        font-size: 1.1rem;
        line-height: 1.1;
    }

    .hero-product-description {
        font-size: 1rem;
        margin-bottom: 1.5rem;
        line-height: 1.5;
        text-align: center;
        max-width: 100%;
        padding: 0 1rem;
    }

    .hero-platform-support {
        text-align: center;
        margin-bottom: 0;
    }

    .hero-platform-support p {
        font-size: 1rem;
        margin-bottom: 0.75rem;
    }

    .hero-platform-icons {
        justify-content: center;
        gap: 1rem;
    }

    .hero-platform-icon {
        font-size: 0.85rem;
        padding: 0.4rem 0.8rem;
    }

    .hero-platform-note {
        font-size: 0.75rem;
        text-align: center;
        margin-top: 0.75rem;
    }

    .hero-free-version {
        font-size: 0.95rem;
        margin-bottom: 1rem;
    }

    .hero-download-section {
        padding: 1.5rem 0;
    }

    .hero-app-store-badge-official {
        min-width: 200px;
        padding: 12px 20px;
        gap: 14px;
        border-radius: 10px;
    }

    .hero-apple-logo svg {
        width: 22px;
        height: 26px;
    }

    .hero-download-text-small {
        font-size: 11px;
    }

    .hero-app-store-text-large {
        font-size: 20px;
    }

    .hero-cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }

    /* 按钮优化 */
    .cta-buttons {
        flex-direction: column;
        gap: 0.75rem;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
        min-height: 48px; /* 确保触摸目标足够大 */
    }

    /* 章节标题优化 */
    .section {
        padding: 3rem 0;
    }

    .section h2 {
        font-size: 2rem;
        margin-bottom: 1.5rem;
        line-height: 1.2;
    }

    .section .lead {
        font-size: 1.1rem;
        line-height: 1.4;
    }

    /* 特性卡片优化 */
    .feature-card {
        padding: 1.5rem 1rem;
        margin-bottom: 1rem;
    }

    .feature-card i {
        font-size: 2rem;
        margin-bottom: 1rem;
    }

    .feature-card h3 {
        font-size: 1.25rem;
        margin-bottom: 0.75rem;
        line-height: 1.3;
    }

    .feature-card p {
        font-size: 0.95rem;
        line-height: 1.4;
    }

    /* 联系信息优化 */
    .contact-info p {
        font-size: 1rem;
        line-height: 1.4;
        margin-bottom: 0.75rem;
    }

    /* 页脚优化 */
    footer {
        padding: 1.5rem 0;
        margin-top: 3rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .footer-content p {
        font-size: 0.8rem;
        line-height: 1.3;
        margin-bottom: 0.5rem;
    }

    /* 确保版权信息在移动端保持一行 */
    footer p {
        font-size: 0.8rem !important;
        line-height: 1.3;
        word-spacing: -0.05em;
        letter-spacing: -0.02em;
    }

    /* 隐私政策链接优化 */
    footer a {
        font-size: 0.8rem;
        white-space: nowrap;
    }
}

/* 小手机 (最大宽度 575px) */
@media (max-width: 575px) {
    /* 进一步优化小屏幕 */
    .content-wrapper {
        padding: 1rem 0.5rem;
    }

    /* Hero区域进一步优化 */
    .hero-section {
        padding: 1.5rem 0;
    }

    .hero-main-title {
        font-size: 2rem;
        margin-bottom: 0.25rem;
    }

    .hero-sub-title {
        font-size: 1rem;
    }

    .hero-product-description {
        font-size: 0.95rem;
        margin-bottom: 1.25rem;
        line-height: 1.3;
    }

    .hero-platform-support p {
        font-size: 0.95rem;
    }

    .hero-platform-icon {
        font-size: 0.85rem;
        padding: 0.4rem 0.8rem;
    }

    .hero-free-version {
        font-size: 0.9rem;
    }

    .hero-app-store-badge-official {
        min-width: 180px;
        padding: 10px 18px;
        gap: 12px;
        border-radius: 8px;
    }

    .hero-apple-logo svg {
        width: 20px;
        height: 24px;
    }

    .hero-download-text-small {
        font-size: 10px;
    }

    .hero-app-store-text-large {
        font-size: 18px;
    }

    /* 按钮进一步优化 */
    .btn {
        max-width: 100%;
        padding: 1rem 1.25rem;
        font-size: 0.95rem;
    }

    /* 章节进一步优化 */
    .section {
        padding: 2.5rem 0;
    }

    .section h2 {
        font-size: 1.75rem;
        margin-bottom: 1.25rem;
    }

    .section .lead {
        font-size: 1rem;
    }

    /* 特性卡片进一步优化 */
    .feature-card {
        padding: 1.25rem 0.75rem;
    }

    .feature-card i {
        font-size: 1.75rem;
    }

    .feature-card h3 {
        font-size: 1.1rem;
    }

    .feature-card p {
        font-size: 0.9rem;
    }

    /* 导航栏进一步优化 */
    .navbar-brand {
        font-size: 1.1rem;
    }

    .nav-link {
        font-size: 0.95rem;
    }

    /* 页脚进一步优化 */
    footer p {
        font-size: 0.75rem !important;
        line-height: 1.2;
        word-spacing: -0.1em;
        letter-spacing: -0.03em;
    }

    footer a {
        font-size: 0.75rem;
    }

    /* 隐私政策标题进一步优化 */
    .policy-content h1,
    .mobile-compact-title {
        font-size: 0.95rem !important;
        line-height: 0.9;
        word-spacing: -0.2em;
        letter-spacing: -0.1em;
        transform: scale(0.9);
        transform-origin: center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
    }

    /* 联系信息进一步优化 */
    .contact-info p,
    .mobile-compact-text {
        font-size: 0.75rem;
        line-height: 1.1;
        word-spacing: -0.12em;
        letter-spacing: -0.06em;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        transform: scale(0.95);
        transform-origin: left center;
    }

    .contact-info strong {
        font-size: 0.7rem;
        display: inline-block;
        white-space: nowrap;
    }
}

/* 超小屏幕 (最大宽度 375px) */
@media (max-width: 375px) {
    /* Hero区域超小屏幕优化 */
    .hero-section {
        padding: 1rem 0;
    }

    .hero-main-title {
        font-size: 1.6rem;
        margin-bottom: 0.2rem;
    }

    .hero-sub-title {
        font-size: 0.85rem;
    }

    .hero-product-description {
        font-size: 0.85rem;
        margin-bottom: 1rem;
        line-height: 1.25;
    }

    .hero-platform-support p {
        font-size: 0.9rem;
        margin-bottom: 0.5rem;
    }

    .hero-platform-icon {
        font-size: 0.8rem;
        padding: 0.35rem 0.7rem;
    }

    .hero-free-version {
        font-size: 0.85rem;
        margin-bottom: 0.75rem;
    }

    .hero-app-store-badge-official {
        min-width: 160px;
        padding: 8px 16px;
        gap: 10px;
        border-radius: 6px;
    }

    .hero-apple-logo svg {
        width: 18px;
        height: 22px;
    }

    .hero-download-text-small {
        font-size: 9px;
    }

    .hero-app-store-text-large {
        font-size: 16px;
    }

    .section h2 {
        font-size: 1.5rem;
    }

    .feature-card {
        padding: 1rem 0.5rem;
    }

    .btn {
        padding: 0.875rem 1rem;
        font-size: 0.9rem;
    }

    /* 页脚超小屏幕优化 */
    footer p {
        font-size: 0.7rem !important;
        line-height: 1.1;
        word-spacing: -0.15em;
        letter-spacing: -0.05em;
    }

    footer a {
        font-size: 0.7rem;
    }

    /* 隐私政策标题超小屏幕优化 */
    .policy-content h1,
    .mobile-compact-title {
        font-size: 0.8rem !important;
        line-height: 0.85;
        word-spacing: -0.25em;
        letter-spacing: -0.12em;
        margin-bottom: 1rem;
        transform: scale(0.85);
        transform-origin: center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
    }

    /* 联系信息超小屏幕优化 */
    .contact-info p,
    .mobile-compact-text {
        font-size: 0.65rem;
        line-height: 1.0;
        word-spacing: -0.18em;
        letter-spacing: -0.1em;
        transform: scale(0.9);
        transform-origin: left center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
    }

    .contact-info strong {
        font-size: 0.6rem;
        display: inline-block;
        white-space: nowrap;
    }
}

/* 横屏模式优化 */
@media (max-height: 500px) and (orientation: landscape) {
    .hero-section {
        min-height: auto;
        padding: 2rem 0;
    }

    .hero-section h1 {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }

    .hero-section h2 {
        font-size: 1.1rem;
        margin-bottom: 1rem;
    }

    .hero-section .lead {
        font-size: 0.95rem;
        margin-bottom: 1.5rem;
    }

    .section {
        padding: 2rem 0;
    }
}

/* 404页面样式 */
.error-section {
    min-height: calc(100vh - 76px);
    display: flex;
    align-items: center;
    text-align: center;
    padding: 4rem 0;
}

.error-section h1 {
    font-size: 8rem;
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.error-section h2 {
    font-size: 2rem;
    color: var(--text-color);
    margin-bottom: 2rem;
}

/* 隐私政策页面样式 */
.policy-content {
    max-width: 800px;
    margin: 0 auto;
}

.policy-content h1 {
    font-size: 2.2rem;
    color: var(--text-color);
    margin-bottom: 2rem;
    line-height: 1.2;
    /* 为移动端准备的基础样式 */
    word-break: keep-all;
    overflow-wrap: normal;
}

.policy-content h2 {
    font-size: 1.8rem;
    color: var(--text-color);
    margin: 2rem 0 1rem;
}

.policy-content p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.policy-content ul {
    color: var(--text-muted);
    margin-bottom: 2rem;
    padding-left: 1.5rem;
}

.policy-content li {
    margin-bottom: 0.5rem;
}

/* 导航栏激活状态 */
.nav-link.active {
    color: var(--accent-color) !important;
}

/* 移动端触摸优化 */
@media (hover: none) and (pointer: coarse) {
    /* 移除hover效果，使用更适合触摸的交互 */
    .feature-card:hover {
        transform: none;
    }

    .feature-card:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }

    .btn:hover {
        transform: none;
    }

    .btn:active {
        transform: scale(0.98);
    }

    .nav-link:hover {
        background-color: transparent;
    }

    .nav-link:active {
        background-color: rgba(255, 255, 255, 0.1);
    }
}

/* 确保所有可点击元素有足够的触摸目标 */
@media (max-width: 767px) {
    .navbar-toggler {
        min-width: 44px;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .dropdown-item {
        padding: 0.75rem 1rem;
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    /* 改进语言切换下拉菜单 */
    .dropdown-menu {
        min-width: 120px;
        border: none;
        background-color: var(--primary-color);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    }

    .dropdown-item {
        color: var(--text-color);
        transition: background-color 0.2s ease;
    }

    .dropdown-item:hover,
    .dropdown-item:focus {
        background-color: rgba(255, 255, 255, 0.1);
        color: var(--text-color);
    }

    .dropdown-item.active {
        background-color: var(--accent-color);
        color: white;
    }
}

/* 移动端文本可读性优化 */
@media (max-width: 767px) {
    /* 确保文本有足够的对比度和可读性 */
    p, .lead {
        line-height: 1.5;
        word-spacing: 0.1em;
    }

    /* 改善链接的可访问性 */
    a {
        text-decoration: underline;
        text-decoration-thickness: 1px;
        text-underline-offset: 2px;
    }

    .btn, .nav-link {
        text-decoration: none;
    }

    /* 改善焦点状态的可见性 */
    .btn:focus,
    .nav-link:focus,
    .dropdown-item:focus {
        outline: 2px solid var(--accent-color);
        outline-offset: 2px;
    }

    /* 改善表单元素（如果有的话） */
    input, textarea, select {
        min-height: 44px;
        padding: 0.75rem;
        font-size: 16px; /* 防止iOS缩放 */
    }

    /* 隐私政策页面移动端优化 */
    .policy-content h1,
    .mobile-compact-title {
        font-size: 1.1rem !important;
        line-height: 0.95;
        margin-bottom: 1.5rem;
        word-spacing: -0.15em;
        letter-spacing: -0.08em;
        transform: scale(0.95);
        transform-origin: center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 100%;
    }

    /* 联系信息移动端优化 */
    .contact-info p,
    .mobile-compact-text {
        font-size: 0.85rem;
        line-height: 1.2;
        margin-bottom: 0.6rem;
        word-spacing: -0.08em;
        letter-spacing: -0.03em;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .contact-info strong {
        font-size: 0.8rem;
        white-space: nowrap;
    }
}

/* 改善加载性能的CSS */
.feature-card,
.btn,
.nav-link {
    will-change: transform;
}

/* 移动端特定的动画优化 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 深色模式支持（如果系统偏好深色模式） */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #2a2a2a;
        --secondary-color: #1a1a1a;
        --text-color: #e0e0e0;
        --text-muted: #b0b0b0;
    }
}

/* 表格深色主题 */
.policy-content .table {
    color: var(--text-color);
    background-color: var(--bg-color);
    border-color: var(--border-color);
}

.policy-content .table th {
    background-color: var(--bg-color);
    border-color: var(--border-color);
    color: var(--text-color);
}

.policy-content .table td {
    border-color: var(--border-color);
}

/* Tab样式 */
.nav-tabs {
    border-bottom-color: var(--border-color);
    margin-bottom: 2rem;
}

.nav-tabs .nav-link {
    color: var(--text-muted);
    border: none;
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.nav-tabs .nav-link:hover {
    color: var(--text-color);
    border: none;
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-tabs .nav-link.active {
    color: var(--accent-color);
    background-color: transparent;
    border: none;
    border-bottom: 2px solid var(--accent-color);
}

.tab-content {
    padding: 1rem 0;
}

/* 移动端额外优化 */

/* 懒加载图片样式 */
img.lazy {
    opacity: 0;
    transition: opacity 0.3s;
}

img.lazy.loaded {
    opacity: 1;
}

/* 加载状态指示器 */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 触摸反馈增强 */
.touch-feedback {
    position: relative;
    overflow: hidden;
}

.touch-feedback::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.touch-feedback:active::after {
    width: 300px;
    height: 300px;
}

/* iOS Safari 特定优化 */
@supports (-webkit-touch-callout: none) {
    .hero-section {
        min-height: calc(var(--vh, 1vh) * 100 - 76px);
    }

    /* 修复iOS Safari的100vh问题 */
    .hero-section,
    .error-section {
        min-height: -webkit-fill-available;
    }
}

/* 网络连接优化 */
@media (prefers-reduced-data: reduce) {
    /* 在低数据模式下减少动画和效果 */
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }

    .feature-card:hover {
        transform: none;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --text-color: #ffffff;
        --text-muted: #cccccc;
        --primary-color: #000000;
        --secondary-color: #000000;
    }

    .btn-outline {
        border-width: 3px;
    }

    .nav-link:focus,
    .btn:focus {
        outline: 3px solid var(--accent-color);
        outline-offset: 2px;
    }
}

/* 强制深色模式（用户偏好） */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #2a2a2a;
        --secondary-color: #1a1a1a;
        --text-color: #e0e0e0;
        --text-muted: #b0b0b0;
    }
}

/* 移动端键盘适配 */
@media (max-width: 767px) {
    /* 当虚拟键盘出现时的适配 */
    .keyboard-open {
        height: calc(var(--vh, 1vh) * 100);
        overflow: hidden;
    }

    /* 改善移动端表单体验 */
    input[type="text"],
    input[type="email"],
    input[type="tel"],
    textarea {
        font-size: 16px; /* 防止iOS缩放 */
        border-radius: 8px;
        border: 2px solid var(--text-muted);
        background-color: var(--primary-color);
        color: var(--text-color);
        padding: 12px 16px;
        transition: border-color 0.3s ease;
    }

    input:focus,
    textarea:focus {
        border-color: var(--accent-color);
        outline: none;
        box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
    }
}

/* 移动端导航栏安全区域适配 */
@media (max-width: 767px) {
    .navbar {
        padding-top: max(0.75rem, var(--safe-area-inset-top));
        padding-left: max(1rem, var(--safe-area-inset-left));
        padding-right: max(1rem, var(--safe-area-inset-right));
    }

    .container {
        padding-left: max(15px, var(--safe-area-inset-left));
        padding-right: max(15px, var(--safe-area-inset-right));
    }
}

/* 移动端滚动条优化 */
@media (max-width: 767px) {
    /* 隐藏滚动条但保持功能 */
    ::-webkit-scrollbar {
        width: 0px;
        background: transparent;
    }

    /* 为支持的浏览器提供细滚动条 */
    * {
        scrollbar-width: thin;
        scrollbar-color: var(--accent-color) transparent;
    }
}

/* 移动端性能优化 */
@media (max-width: 767px) {
    /* GPU加速关键元素 */
    .navbar,
    .hero-section,
    .feature-card,
    .btn {
        transform: translateZ(0);
        backface-visibility: hidden;
        perspective: 1000px;
    }

    /* 优化重绘区域 */
    .navbar-collapse {
        contain: layout style paint;
    }

    /* 减少复杂选择器的使用 */
    .nav-item,
    .feature-card,
    .btn {
        contain: layout;
    }
}

/* PWA安装横幅样式 */
.pwa-install-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: white;
    padding: 1rem;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1050;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    /* 支持安全区域 */
    padding-bottom: max(1rem, var(--safe-area-inset-bottom));
    padding-left: max(1rem, var(--safe-area-inset-left));
    padding-right: max(1rem, var(--safe-area-inset-right));
}

.pwa-install-banner[style*="block"] {
    transform: translateY(0);
}

.pwa-banner-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 800px;
    margin: 0 auto;
    gap: 1rem;
}

.pwa-banner-text {
    flex: 1;
}

.pwa-banner-text strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.pwa-banner-text p {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.9;
}

.pwa-banner-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

.pwa-banner-actions .btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    min-height: auto;
    white-space: nowrap;
}

/* 移动端PWA横幅优化 */
@media (max-width: 575px) {
    .pwa-banner-content {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }

    .pwa-banner-actions {
        width: 100%;
        justify-content: center;
    }

    .pwa-banner-actions .btn {
        flex: 1;
        max-width: 120px;
    }
}