/* Reset and Base Styles */
* {
    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: #333;
    overflow-x: hidden;
}

/* 可爱的中文字体 */
.hero-subtitle,
.hero-main-title,
.section-title,
.about-title,
.download-title,
.contact-form h3 {
    font-family: 'ZCOOL KuaiLe', 'ZCOOL QingKe HuangYou', 'Inter', sans-serif;
}

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

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
}

.logo-img {
    height: 50px;
    width: auto;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #ff6b6b;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #ff6b6b;
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: 10px;
}

.lang-btn {
    background: none;
    border: none;
    font-size: 14px;
    font-weight: 500;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: #666;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 20px;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.lang-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 107, 0.2), transparent);
    transition: left 0.5s ease;
}

.lang-btn:hover::before {
    left: 100%;
}

.lang-btn:hover {
    color: #ff6b6b;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.2);
}

.lang-btn.active:hover {
    color: #ff6b6b !important;
    background: none !important;
    box-shadow: none !important;
    transform: none !important;
}

.lang-btn.active {
    color: #ff6b6b !important;
    background: none !important;
    box-shadow: none !important;
    transform: none !important;
    animation: none !important;
    position: relative;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
    font-weight: 500 !important;
    font-size: 14px !important;
}

.lang-btn.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: #ff6b6b;
    border-radius: 1px;
}

@keyframes rotateGradient {
    0% {
        background: linear-gradient(135deg, #ff6b6b, #ff5252, #ff6b6b);
    }
    50% {
        background: linear-gradient(315deg, #ff6b6b, #ff5252, #ff6b6b);
    }
    100% {
        background: linear-gradient(135deg, #ff6b6b, #ff5252, #ff6b6b);
    }
}

@keyframes slideIn {
    from {
        width: 0;
        opacity: 0;
    }
    to {
        width: 20px;
        opacity: 1;
    }
}

.lang-separator {
    color: #ccc;
    font-weight: 300;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    filter: brightness(0.7) contrast(1.1);
}

.hero-slide.active {
    opacity: 1;
}

.hero-slide::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.6) 0%, rgba(118, 75, 162, 0.6) 100%);
    z-index: 1;
}

/* Add subtle zoom effect to background images */
.hero-slide {
    transform: scale(1.05);
    transition: opacity 1s ease-in-out, transform 8s ease-in-out;
}

.hero-slide.active {
    opacity: 1;
    transform: scale(1);
}

.hero-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: radial-gradient(circle, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 20px 20px;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero .container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 3;
    text-align: center;
}

.hero-content {
    color: white;
    text-align: center;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.hero-subtitle {
    display: block;
    font-size: 18px;
    font-weight: 400;
    margin-bottom: 10px;
    opacity: 0.9;
    animation: subtitleGlow 3s ease-in-out infinite;
}

@keyframes subtitleGlow {
    0%, 100% { text-shadow: 0 0 5px rgba(255, 255, 255, 0.5); }
    50% { text-shadow: 0 0 20px rgba(255, 255, 255, 0.8); }
}

.hero-main-title {
    display: block;
    font-size: 72px;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: titleBounce 2s ease-in-out infinite;
}

@keyframes titleBounce {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
}

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

@keyframes pulse {
    0%, 100% { 
        transform: translateY(-1px) scale(1);
        box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
    }
    50% { 
        transform: translateY(-1px) scale(1.05);
        box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
    }
}

.hero-description {
    font-size: 18px;
    margin-bottom: 40px;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    align-items: center;
    width: 100%;
    margin: 0 auto;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    width: 160px;
    text-align: center;
    white-space: nowrap;
    box-sizing: border-box;
}

.btn-primary {
    background: #ff6b6b;
    color: white;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
}

.btn-primary:hover {
    background: #ff5252;
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px) scale(1.05);
}

.btn-outline {
    background: transparent;
    color: #ff6b6b;
    border: 2px solid #ff6b6b;
}

.btn-outline:hover {
    background: #ff6b6b;
    color: white;
}

/* Pet Characters Animation - Removed */

/* Carousel Controls */
.hero-carousel {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 30px;
    z-index: 3;
}

.carousel-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    font-size: 24px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.carousel-dots {
    display: flex;
    gap: 10px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    background: white;
    transform: scale(1.2);
}

/* Features Section */
.features {
    padding: 100px 0;
    background: white;
}

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

.section-title {
    font-size: 48px;
    font-weight: 700;
    color: #333;
    margin-bottom: 10px;
}

/* 下载中心标题特定样式 */
.download .section-title {
    color: #fff;
}

.section-subtitle {
    font-size: 18px;
    color: #666;
    font-weight: 400;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.feature-card {
    text-align: center;
    padding: 30px 20px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.7) 100%);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s ease;
}

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

.feature-card:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
    border-color: rgba(255, 107, 107, 0.3);
}

.feature-image {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    background: linear-gradient(135deg, #ff6b6b, #feca57);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-image {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 10px 25px rgba(255, 107, 107, 0.3);
}

.feature-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 18px;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-img {
    transform: scale(1.1);
}

.feature-title {
    font-size: 22px;
    font-weight: 700;
    color: #ff6b6b;
    margin-bottom: 15px;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-title {
    transform: scale(1.05);
    color: #ff5252;
}

.feature-description {
    color: #666;
    line-height: 1.6;
    font-size: 14px;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-description {
    color: #333;
}

/* About Section */
.about {
    padding: 100px 0;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 30px;
}

.about-description {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 30px;
    opacity: 0.9;
}

.about-logo {
    text-align: center;
}

.about-logo-img {
    max-width: 300px;
    height: auto;
}

/* Download Section */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.download-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 20px;
    color: #fff;
}

.download-description {
    font-size: 18px;
    line-height: 1.6;
    margin-bottom: 30px;
    opacity: 0.9;
}

.download-features {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.download-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 500;
}

.download-feature .feature-icon {
    font-size: 24px;
}

.download-feature .platform-icon {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.download-buttons {
    display: flex;
    gap: 20px;
}

.phone-mockup-container {
    position: relative;
    width: 300px;
    height: 500px;
    margin: 0 auto;
}

.phone-mockup {
    position: absolute;
    width: 200px;
    height: 400px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: all 0.8s ease;
    cursor: pointer;
    z-index: 1;
}

.phone-mockup.active {
    opacity: 1 !important;
    z-index: 10;
}

.phone-mockup:hover {
    transform: translate(-50%, -50%) scale(1.05);
}

/* 手机导航按钮 */
.phone-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: rgba(255, 255, 255, 0.8);
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.phone-nav-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 1);
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.phone-nav-btn:active {
    transform: translateY(-50%) scale(0.95);
}

.phone-prev-btn {
    left: -25px;
}

.phone-next-btn {
    right: -25px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .phone-nav-btn {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }
    
    .phone-prev-btn {
        left: -20px;
    }
    
    .phone-next-btn {
        right: -20px;
    }
}

@media (max-width: 480px) {
    .phone-nav-btn {
        width: 35px;
        height: 35px;
        font-size: 18px;
    }
    
    .phone-prev-btn {
        left: -17px;
    }
    
    .phone-next-btn {
        right: -17px;
    }
}

.phone-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.25);
    filter: drop-shadow(0 0 10px rgba(0, 0, 0, 0.15));
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.phone-dots {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 30px;
}

.phone-dot {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    border: 2px solid rgba(255, 255, 255, 0.6);
    cursor: pointer;
    transition: all 0.3s ease;
}

.phone-dot:hover {
    background: rgba(255, 107, 107, 0.8);
    border-color: rgba(255, 107, 107, 1);
    transform: scale(1.2);
}

.phone-dot.active {
    background: rgba(255, 107, 107, 1);
    border-color: rgba(255, 107, 107, 1);
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(255, 107, 107, 0.5);
}

/* Contact Section */
.contact {
    padding: 100px 0;
    background: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 15px;
    transition: all 0.3s ease;
}

.contact-item:hover {
    background: #e9ecef;
    transform: translateY(-2px);
}

.contact-icon {
    font-size: 32px;
    width: 60px;
    height: 60px;
    background: #ff6b6b;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-details h4 {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 5px;
}

.contact-details p {
    color: #666;
    font-size: 16px;
}

.contact-form {
    background: #f8f9fa;
    padding: 40px;
    border-radius: 20px;
}

.contact-form h3 {
    font-size: 24px;
    font-weight: 600;
    color: #333;
    margin-bottom: 30px;
    text-align: center;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-input,
.form-textarea {
    padding: 15px;
    border: 2px solid #e9ecef;
    border-radius: 10px;
    font-size: 16px;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s ease;
    background: white;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: #ff6b6b;
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.1);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo-img {
    height: 50px;
    width: auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
}

.footer-link {
    color: white;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: #ff6b6b;
}

.footer-contact p {
    margin-bottom: 10px;
    font-size: 14px;
    opacity: 0.8;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    opacity: 0.6;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.hamburger-line {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-menu-btn.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Navigation */
.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 300px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: right 0.3s ease;
    overflow-y: auto;
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #eee;
}

.mobile-logo {
    height: 40px;
    width: auto;
}

.mobile-close-btn {
    background: none;
    border: none;
    font-size: 24px;
    color: #666;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.mobile-close-btn:hover {
    background: #f5f5f5;
    color: #333;
}

.mobile-nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.mobile-nav-link {
    display: block;
    padding: 15px 20px;
    color: #333;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    border-bottom: 1px solid #f5f5f5;
    transition: all 0.3s ease;
}

.mobile-nav-link:hover {
    background: #f8f9fa;
    color: #ff6b6b;
    padding-left: 25px;
}

.mobile-language-switcher {
    padding: 20px;
    border-top: 1px solid #eee;
    margin-top: auto;
}

.mobile-lang-btn {
    display: block;
    width: 100%;
    padding: 12px 20px;
    margin: 5px 0;
    background: none;
    border: 2px solid #eee;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: #666;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.mobile-lang-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 107, 107, 0.2), transparent);
    transition: left 0.5s ease;
}

.mobile-lang-btn:hover::before {
    left: 100%;
}

.mobile-lang-btn:hover {
    border-color: #ff6b6b;
    color: #ff6b6b;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.2);
}

.mobile-lang-btn.active {
    background: none !important;
    color: #ff6b6b !important;
    border-color: #ff6b6b !important;
    box-shadow: none !important;
    transform: none !important;
    animation: none !important;
    position: relative;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif !important;
    font-weight: 500 !important;
    font-size: 14px !important;
}

.mobile-lang-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: #ff6b6b;
    border-radius: 1px;
}

@keyframes bounceIn {
    0% {
        transform: translateY(-50%) scale(0);
        opacity: 0;
    }
    50% {
        transform: translateY(-50%) scale(1.2);
    }
    100% {
        transform: translateY(-50%) scale(1);
        opacity: 1;
    }
}

.mobile-lang-btn.active:hover {
    background: none;
    color: #ff6b6b;
    transform: none;
    box-shadow: none;
}

/* Overlay for mobile menu */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.mobile-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-list {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .language-switcher {
        display: none;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-main-title {
        font-size: 48px;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .btn {
        width: 140px;
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 15px;
    }
    
    /* Download section responsive */
    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .download-features {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .download-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    /* Contact section responsive */
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .contact-form {
        order: -1;
    }
    
    /* Adjust mobile nav width for smaller screens */
    .mobile-nav {
        width: 280px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-main-title {
        font-size: 36px;
    }
    
    .section-title {
        font-size: 36px;
    }
    
    .about-title {
        font-size: 36px;
    }
    
    .btn {
        width: 120px;
        padding: 10px 16px;
        font-size: 13px;
    }
    
    .hero-buttons {
        gap: 15px;
    }
}

/* Privacy Policy Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    background: white;
    border-radius: 20px;
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
    display: flex;
    flex-direction: column;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    border-bottom: 1px solid #eee;
    position: sticky;
    top: 0;
    background: white;
    border-radius: 20px 20px 0 0;
    z-index: 10;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.modal-title {
    font-size: 24px;
    font-weight: 700;
    color: #333;
    margin: 0;
}

.modal-close-btn {
    background: none;
    border: none;
    font-size: 28px;
    color: #666;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.modal-close-btn:hover {
    background: #f5f5f5;
    color: #333;
}

.modal-body {
    padding: 30px;
    padding-top: 20px;
    overflow-y: auto;
    flex: 1;
    scroll-behavior: smooth;
}

.privacy-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: #333;
    margin: 30px 0 15px 0;
    border-bottom: 2px solid #ff6b6b;
    padding-bottom: 8px;
}

.privacy-content h3:first-child {
    margin-top: 10px;
}

/* 服务条款模态框样式 */
.terms-content h3:first-child {
    margin-top: 10px;
}

.privacy-content p {
    font-size: 16px;
    line-height: 1.7;
    color: #555;
    margin-bottom: 18px;
}

.privacy-content ul {
    margin: 15px 0;
    padding-left: 20px;
}

.privacy-content li {
    font-size: 16px;
    line-height: 1.6;
    color: #555;
    margin-bottom: 10px;
    position: relative;
    padding-left: 5px;
}

.privacy-content li::before {
    content: "•";
    color: #ff6b6b;
    font-weight: bold;
    position: absolute;
    left: -15px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        max-height: 85vh;
    }
    
    .modal-header {
        padding: 20px 25px;
    }
    
    .modal-body {
        padding: 25px;
    }
    
    .modal-title {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .modal-content {
        width: 98%;
        max-height: 90vh;
    }
    
    .modal-header {
        padding: 15px 20px;
    }
    
    .modal-body {
        padding: 20px;
    }
    
    .privacy-content h3 {
        font-size: 16px;
    }
    
    .privacy-content p,
    .privacy-content li {
        font-size: 14px;
    }
}