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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #fff;
    overflow-x: hidden;
}

/* 添加页面加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

/* 滚动动画类 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

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

/* 导航栏 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(238, 238, 238, 0.5);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

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

.logo-img {
    width: 32px;
    height: 32px;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    color: #2563eb;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    text-decoration: none;
    color: #666;
    font-weight: 500;
    transition: color 0.3s;
}

.nav a:hover {
    color: #2563eb;
}

/* 主横幅 */
.banner {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 120px 0 100px;
    margin-top: 60px;
    position: relative;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="10" cy="60" r="0.5" fill="rgba(255,255,255,0.05)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.05)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.banner .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.banner-content h1 {
    font-size: 56px;
    font-weight: 800;
    color: white;
    margin-bottom: 24px;
    line-height: 1.1;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.banner-desc {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    line-height: 1.6;
    font-weight: 300;
}

.banner-buttons {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.btn::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;
}

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

.btn-primary {
    background: white;
    color: #667eea;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
}

.btn-outline {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

.banner-image {
    text-align: center;
    position: relative;
}

.banner-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
    border-radius: 24px;
    z-index: -1;
}

.app-img {
    max-width: 350px;
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    transition: transform 0.3s ease;
}

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

/* 功能区域 */
.features {
    padding: 100px 0;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, #e2e8f0, transparent);
}

.features h2 {
    text-align: center;
    font-size: 42px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 20px;
    position: relative;
}

.features h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.feature-item {
    padding: 40px 30px;
    border: 1px solid rgba(102, 126, 234, 0.1);
    border-radius: 16px;
    background: white;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-item:hover::before {
    transform: scaleX(1);
}

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(102, 126, 234, 0.15);
    border-color: rgba(102, 126, 234, 0.2);
}

.feature-item h3 {
    font-size: 22px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 16px;
    position: relative;
}

.feature-item h3::before {
    content: '●';
    color: #667eea;
    margin-right: 8px;
    font-size: 16px;
}

.feature-item p {
    color: #64748b;
    line-height: 1.7;
    font-size: 15px;
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="dots" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="rgba(102,126,234,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23dots)"/></svg>');
    opacity: 0.5;
}

.download h2 {
    text-align: center;
    font-size: 42px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 20px;
    position: relative;
    z-index: 2;
}

.download h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.download-item {
    background: white;
    padding: 50px 40px;
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(102, 126, 234, 0.1);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.download-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.download-item:hover::before {
    transform: scaleX(1);
}

.download-item:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 50px rgba(102, 126, 234, 0.2);
}

.platform-icon {
    font-size: 64px;
    margin-bottom: 24px;
    display: block;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.download-item h3 {
    font-size: 28px;
    font-weight: 700;
    color: #1e293b;
    margin-bottom: 12px;
}

.download-item p {
    color: #64748b;
    margin-bottom: 32px;
    font-size: 16px;
}

.download-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 16px 40px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.download-btn::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;
}

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

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

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

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

.contact-header h2 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 16px;
    color: white;
}

.contact-header p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.8);
    font-weight: 300;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: 40px 30px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #ffd700, #ffed4e);
}

.contact-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    color: white;
}

.contact-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
    color: white;
}

.contact-card p {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: 8px;
    color: white;
}

.contact-desc {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 300;
}

/* 页脚 */
.footer {
    background: #1e293b;
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer p {
    color: #94a3b8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .banner .container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .banner-content h1 {
        font-size: 36px;
    }
    
    .banner-buttons {
        justify-content: center;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .download-options {
        grid-template-columns: 1fr;
    }
    
    /* 联系我们移动端适配 */
    .contact {
        padding: 60px 0;
    }
    
    .contact-header h2 {
        font-size: 32px;
    }
    
    .contact-header p {
        font-size: 16px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 0 10px;
    }
    
    .contact-card {
        padding: 30px 20px;
    }
    
    .contact-icon {
        width: 50px;
        height: 50px;
        margin-bottom: 20px;
    }
    
    .contact-card h3 {
        font-size: 20px;
    }
    
    .contact-card p {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .banner {
        padding: 80px 0 60px;
    }
    
    .banner-content h1 {
        font-size: 28px;
    }
    
    .banner-desc {
        font-size: 16px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
    
    /* 联系我们小屏手机适配 */
    .contact {
        padding: 50px 0;
    }
    
    .contact-header h2 {
        font-size: 28px;
    }
    
    .contact-header p {
        font-size: 14px;
    }
    
    .contact-grid {
        gap: 20px;
        padding: 0 5px;
    }
    
    .contact-card {
        padding: 25px 15px;
    }
    
    .contact-icon {
        width: 45px;
        height: 45px;
        margin-bottom: 15px;
    }
    
    .contact-card h3 {
        font-size: 18px;
        margin-bottom: 10px;
    }
    
    .contact-card p {
        font-size: 15px;
        margin-bottom: 6px;
    }
    
    .contact-desc {
        font-size: 12px;
    }
}