:root {
    /* iOS 颜色系统 */
    --ios-blue: #007AFF;
    --ios-green: #34C759;
    --ios-red: #FF3B30;
    --ios-orange: #FF9500;
    --ios-purple: #AF52DE;
    --ios-pink: #FF2D92;
    --ios-gray: #8E8E93;
    --ios-gray2: #AEAEB2;
    --ios-gray3: #C7C7CC;
    --ios-gray4: #D1D1D6;
    --ios-gray5: #E5E5EA;
    --ios-gray6: #F2F2F7;
    --ios-background: #FFFFFF;
    --ios-secondary-bg: #F2F2F7;
    --ios-tertiary-bg: #FFFFFF;
    --ios-label: #000000;
    --ios-secondary-label: #3C3C43;
    --ios-tertiary-label: #3C3C4399;
    --ios-quaternary-label: #3C3C434D;
    
    /* 间距系统 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 20px;
    --space-2xl: 24px;
    --space-3xl: 32px;
    --space-4xl: 48px;
    --space-5xl: 64px;
    
    /* 圆角系统 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;
    
    /* 阴影系统 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
}

/* 深色模式 */
@media (prefers-color-scheme: dark) {
    :root {
        --ios-blue: #0A84FF;
        --ios-green: #30D158;
        --ios-red: #FF453A;
        --ios-orange: #FF9F0A;
        --ios-purple: #BF5AF2;
        --ios-pink: #FF375F;
        --ios-gray: #8E8E93;
        --ios-gray2: #636366;
        --ios-gray3: #48484A;
        --ios-gray4: #3A3A3C;
        --ios-gray5: #2C2C2E;
        --ios-gray6: #1C1C1E;
        --ios-background: #000000;
        --ios-secondary-bg: #1C1C1E;
        --ios-tertiary-bg: #2C2C2E;
        --ios-label: #FFFFFF;
        --ios-secondary-label: #EBEBF5;
        --ios-tertiary-label: #EBEBF599;
        --ios-quaternary-label: #EBEBF54D;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--ios-label);
    background-color: var(--ios-background);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--ios-gray5);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 18px;
    color: var(--ios-label);
}

.nav-brand i {
    color: var(--ios-blue);
    font-size: 24px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    color: var(--ios-secondary-label);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--ios-blue);
}

.nav-cta {
    margin-left: var(--space-lg);
}

.nav-toggle {
    display: none;
    font-size: 24px;
    color: var(--ios-label);
    cursor: pointer;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border: none;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--ios-blue);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: color-mix(in srgb, var(--ios-blue) 90%, black);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--ios-gray5);
    color: var(--ios-label);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--ios-gray4);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 英雄区域 */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--ios-background) 0%, var(--ios-secondary-bg) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5xl);
    align-items: center;
}

.hero-content {
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    color: var(--ios-label);
}

.gradient-text {
    background: linear-gradient(135deg, var(--ios-blue), var(--ios-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--ios-secondary-label);
    margin-bottom: var(--space-2xl);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--space-lg);
    flex-wrap: wrap;
}

.hero-btn {
    padding: var(--space-md) var(--space-xl);
    font-size: 16px;
    min-width: 160px;
}

.hero-image {
    animation: fadeInRight 0.8s ease;
}

.hero-mockup {
    background: var(--ios-background);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    max-width: 400px;
    margin: 0 auto;
}

.mockup-header {
    background: var(--ios-gray6);
    padding: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.mockup-dots {
    display: flex;
    gap: 4px;
}

.mockup-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--ios-gray);
}

.mockup-dots span:nth-child(1) { background: #FF5F57; }
.mockup-dots span:nth-child(2) { background: #FFBD2E; }
.mockup-dots span:nth-child(3) { background: #28CA42; }

.mockup-content {
    padding: var(--space-xl);
}

.mockup-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--ios-secondary-bg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
    transition: all 0.2s ease;
}

.mockup-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.mockup-item i {
    color: var(--ios-blue);
    font-size: 20px;
}

/* 功能特色 */
.features {
    padding: 100px 0;
    background: var(--ios-secondary-bg);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-5xl);
}

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--ios-label);
}

.section-header p {
    font-size: 18px;
    color: var(--ios-secondary-label);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
}

.feature-card {
    background: var(--ios-background);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

.feature-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-lg);
    background: linear-gradient(135deg, var(--ios-blue), var(--ios-purple));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--ios-label);
}

.feature-card p {
    color: var(--ios-secondary-label);
    line-height: 1.6;
}

/* 使用场景 */
.use-cases {
    padding: 100px 0;
    background: var(--ios-background);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
}

.use-case {
    background: var(--ios-secondary-bg);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

.use-case.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.use-case:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.use-case-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--space-lg);
    background: var(--ios-blue);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 24px;
}

.use-case h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--ios-label);
}

.use-case ul {
    list-style: none;
    text-align: left;
}

.use-case li {
    padding: var(--space-sm) 0;
    color: var(--ios-secondary-label);
    position: relative;
    padding-left: var(--space-lg);
}

.use-case li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--ios-green);
    font-weight: bold;
}

/* 价格方案 */
.pricing {
    padding: 100px 0;
    background: var(--ios-secondary-bg);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-2xl);
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--ios-background);
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

.pricing-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.pricing-card.featured {
    border: 2px solid var(--ios-blue);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-4px);
}

.pricing-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--ios-blue);
    color: white;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

.pricing-header h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    color: var(--ios-label);
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
    margin-bottom: var(--space-2xl);
}

.currency {
    font-size: 20px;
    color: var(--ios-secondary-label);
}

.amount {
    font-size: 48px;
    font-weight: 700;
    color: var(--ios-label);
}

.period {
    font-size: 16px;
    color: var(--ios-secondary-label);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--space-2xl);
    text-align: left;
}

.pricing-features li {
    padding: var(--space-sm) 0;
    color: var(--ios-secondary-label);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.pricing-features i {
    color: var(--ios-green);
    font-size: 14px;
}

/* FAQ */
.faq {
    padding: 100px 0;
    background: var(--ios-background);
}

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

.faq-item {
    background: var(--ios-secondary-bg);
    margin-bottom: var(--space-md);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.faq-question:hover {
    background: var(--ios-gray6);
}

.faq-question h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--ios-label);
}

.faq-question i {
    color: var(--ios-gray);
    transition: transform 0.3s ease;
}

.faq-answer {
    padding: 0 var(--space-lg) var(--space-lg);
    display: none;
    color: var(--ios-secondary-label);
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: var(--ios-secondary-bg);
    padding: 60px 0 30px;
}

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

.footer-section h3,
.footer-section h4 {
    color: var(--ios-label);
    margin-bottom: var(--space-md);
    font-weight: 600;
}

.footer-section p {
    color: var(--ios-secondary-label);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

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

.footer-section li {
    margin-bottom: var(--space-sm);
}

.footer-section a {
    color: var(--ios-secondary-label);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

.social-links {
    display: flex;
    gap: var(--space-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--ios-gray5);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.social-links a:hover {
    background: var(--ios-blue);
    color: white;
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-2xl);
    border-top: 1px solid var(--ios-gray5);
    color: var(--ios-secondary-label);
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 移动端样式 */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-links {
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--space-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s ease;
        box-shadow: var(--shadow-lg);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
        text-align: center;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .features-grid,
    .use-cases-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-4px);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    /* 安卓原生触摸反馈 */
    .btn:active,
    .nav-link:active,
    .feature-card:active,
    .pricing-card:active,
    .faq-item:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
    
    /* 安卓原生波纹效果 */
    .btn,
    .nav-link,
    .feature-card,
    .pricing-card,
    .faq-item {
        position: relative;
        overflow: hidden;
    }
    
    .btn::after,
    .nav-link::after,
    .feature-card::after,
    .pricing-card::after,
    .faq-item::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 0;
        height: 0;
        background: rgba(255, 255, 255, 0.3);
        border-radius: 50%;
        transform: translate(-50%, -50%);
        transition: width 0.3s ease, height 0.3s ease;
    }
    
    .btn:active::after,
    .nav-link:active::after,
    .feature-card:active::after,
    .pricing-card:active::after,
    .faq-item:active::after {
        width: 300px;
        height: 300px;
    }
}

/* 加载动画增强 */
.loading-shimmer {
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* 悬浮卡片效果 */
.card-hover {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card-hover:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.card-hover::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.card-hover:hover::before {
    left: 100%;
}

/* 进度条动画 */
.progress-bar {
    height: 4px;
    background: var(--ios-gray5);
    border-radius: 2px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--ios-blue), var(--ios-purple));
    border-radius: 2px;
    transition: width 0.3s ease;
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: progress-shimmer 2s infinite;
}

@keyframes progress-shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* 通知徽章 */
.notification-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--ios-red);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    animation: pulse 2s infinite;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* 微交互增强 */
.micro-interaction {
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.micro-interaction:hover {
    transform: scale(1.02);
}

.micro-interaction:active {
    transform: scale(0.98);
}

/* 3D效果增强 */
.perspective-3d {
    perspective: 1000px;
}

.transform-3d {
    transform-style: preserve-3d;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.transform-3d:hover {
    transform: rotateY(5deg) rotateX(5deg) translateZ(10px);
}

/* 毛玻璃效果 */
.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* 滚动条增强 */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--ios-gray6);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb {
    background: var(--ios-gray4);
    border-radius: 3px;
    transition: background 0.2s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--ios-gray3);
}

::-webkit-scrollbar-thumb:active {
    background: var(--ios-gray);
}

/* 焦点样式 */
*:focus-visible {
    outline: 2px solid var(--ios-blue);
    outline-offset: 2px;
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    .card-hover,
    .progress-fill,
    .notification-badge,
    .transform-3d {
        animation: none;
        transition: none;
    }
}

@media (prefers-contrast: high) {
    .feature-card,
    .pricing-card {
        border: 2px solid var(--ios-separator);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* 暗黑模式增强 */
@media (prefers-color-scheme: dark) {
    .card-hover:hover {
        box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
    }
    
    .progress-fill {
        background: linear-gradient(90deg, var(--ios-blue), var(--ios-purple));
    }
    
    .notification-badge {
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    }
    
    .glass-effect {
        background: rgba(28, 28, 30, 0.8);
        border-color: rgba(255, 255, 255, 0.1);
    }
}

/* 悬浮提示 */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    z-index: 1000;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-4px);
}

/* 图标动画 */
.icon-spin {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.icon-bounce {
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* 页面过渡动画 */
.page-transition {
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 文字打字机效果 */
.typewriter {
    overflow: hidden;
    border-right: 0.15em solid var(--ios-blue);
    white-space: nowrap;
    animation: typing 3.5s steps(40, end), blink-caret 0.75s step-end infinite;
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blink-caret {
    from, to { border-color: transparent; }
    50% { border-color: var(--ios-blue); }
}

/* 响应式字体 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: clamp(2rem, 8vw, 2.5rem);
    }
    
    .hero p {
        font-size: clamp(1rem, 4vw, 1.125rem);
    }
    
    .section-title {
        font-size: clamp(1.75rem, 6vw, 2.25rem);
    }
}

/* 性能优化 */
@media (prefers-reduced-motion: reduce) {
    .typewriter,
    .icon-spin,
    .icon-bounce {
        animation: none;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .footer,
    .btn {
        display: none;
    }
    
    .hero,
    .section {
        break-inside: avoid;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-md);
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .section-header h2 {
        font-size: 28px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-btn {
        width: 100%;
        justify-content: center;
    }
}