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

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color: white;
    padding: 80px 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 160px;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.hero-text {
    flex: 0 0 45%;
    padding-top: 40px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.slogan {
    font-size: 1.5rem;
    margin-bottom: 20px;
    opacity: 0.9;
}

.subtitle {
    font-size: 1.2rem;
    margin-bottom: 25px;
    opacity: 0.8;
    font-weight: 400;
    color: #e2e8f0;
}

.about-text {
    font-size: 1.1rem;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 600px;
}

.download-section {
    display: flex;
    align-items: center;
    gap: 40px;
    margin-top: 30px;
}

.download-btn {
    background-color: #fff;
    color: #4f46e5;
    padding: 15px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    white-space: nowrap;
    display: inline-block;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    background-color: #f8fafc;
}

.qr-code {
    text-align: center;
    transition: all 0.3s ease;
}

.qr-code:hover {
    transform: translateY(-2px);
}

.qr-code img {
    width: 120px;
    height: 120px;
    display: block;
}

.hero-image {
    flex: 0 0 55%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    perspective: 1000px;
    margin-top: -60px;
}

.hero-image img {
    max-width: 100%;
    height: auto;
}

/* App Preview Section */
.app-preview {
    padding: 60px 0;
    background-color: white;
}

.preview-container {
    position: relative;
    width: 100%;
    max-width: 600px;
    height: 400px;
    margin-top: -40px;
}

.preview-item {
    position: absolute;
    width: 280px;
    height: 560px;
    border-radius: 30px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    transition: all 0.5s ease;
}

.preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.preview-item-1 {
    left: 0;
    top: -20px;
    transform: rotate(-5deg) translateY(20px);
    z-index: 2;
}

.preview-item-2 {
    right: 0;
    top: 20px;
    transform: rotate(5deg) translateY(0);
    z-index: 1;
}

.preview-item:hover {
    transform: rotate(0) translateY(-10px);
    z-index: 3;
}

.preview-shadow {
    position: absolute;
    bottom: -20px;
    left: 5%;
    width: 90%;
    height: 20px;
    background: rgba(0, 0, 0, 0.2);
    filter: blur(10px);
    border-radius: 50%;
    transition: all 0.5s ease;
}

.preview-item:hover .preview-shadow {
    transform: scale(1.1);
    opacity: 0.3;
}

/* Features Section */
.features {
    padding: 60px 0;
    background-color: #f8fafc;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

.feature-card img {
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #1e293b;
}

/* Footer */
footer {
    background-color: #1e293b;
    color: white;
    padding: 20px 0;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.9rem;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.separator {
    color: rgba(255, 255, 255, 0.3);
}

.beian a {
    color: white;
    text-decoration: none;
}

.contact-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.contact-info span {
    opacity: 0.9;
}

/* Mobile Fixed Download Button */
.mobile-download-btn {
    display: none;
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
    color: white;
    padding: 15px 40px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    white-space: nowrap;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.4);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
}

.mobile-download-btn.show {
    opacity: 1;
    visibility: visible;
}

.mobile-download-btn:hover {
    transform: translateX(-50%) translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.5);
    background: linear-gradient(135deg, #4f46e5 0%, #4338ca 100%);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: 60px;
        padding: 0 20px;
    }

    .hero-text {
        flex: 0 0 100%;
        padding-top: 0;
    }

    .hero-image {
        flex: 0 0 100%;
        margin-top: -10px;
        padding: 0 5px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .slogan {
        font-size: 1.2rem;
    }

    .subtitle {
        font-size: 1rem;
        margin-bottom: 20px;
    }

    .about-text {
        font-size: 1rem;
        margin: 0 auto 30px;
    }

    .download-section {
        flex-direction: column;
        gap: 40px;
        margin-top: 40px;
    }

    .qr-code {
        display: none;
    }

    .preview-container {
        margin-top: 0;
        height: 300px;
        padding: 0 5px;
    }
    
    .preview-item {
        width: 180px;
        height: 360px;
    }
    
    .preview-item-1 {
        left: 3.75%;
        top: -10px;
        transform: rotate(-3deg) translateY(10px);
    }
    
    .preview-item-2 {
        right: 3.75%;
        top: 10px;
        transform: rotate(3deg) translateY(20px);
    }

    .mobile-download-btn {
        display: block;
    }

    .download-section {
        margin-bottom: 0;
    }

    .footer-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .footer-left {
        flex-direction: column;
        gap: 10px;
    }

    .footer-left span {
        display: block;
    }

    .footer-left span.separator {
        display: none;
    }

    footer {
        padding-bottom: 80px;
    }
}