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

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: #f8fafc;
    color: #333;
    line-height: 1.6;
}

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

/* Header */
.header {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: white;
    text-align: center;
    padding: 80px 20px;
    border-radius: 12px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.15);
}

.header a {
    display: inline-block;
    text-decoration: none;
    cursor: pointer;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.header a:hover {
    transform: scale(1.05);
}

.header a:hover .app-logo {
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
    border-color: #f0f9ff;
}

.app-logo {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    margin-bottom: 0;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border: 4px solid white;
    background: white;
    padding: 8px;
    transition: all 0.3s ease;
    display: block;
}

.header h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.header .subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: 30px;
    opacity: 0.95;
}

.header .description {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto 40px;
    line-height: 1.8;
    opacity: 0.9;
}

.cta-button {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 18px 45px;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.cta-button:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.3);
}

/* Features Section */
.features-section {
    background: white;
    border-radius: 12px;
    padding: 60px 40px;
    margin-bottom: 40px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 20px;
    color: #2c3e50;
}

.section-subtitle {
    font-size: 1.2rem;
    text-align: center;
    color: #7f8c8d;
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.feature-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e5e7eb;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
    border-color: #2563eb;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #2563eb;
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #2c3e50;
}

.feature-desc {
    color: #5a6c7d;
    line-height: 1.6;
}

/* Highlights Section */
.highlights-section {
    background: white;
    border-radius: 12px;
    padding: 60px 40px;
    margin-bottom: 40px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.highlight-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
    padding: 25px;
    background: white;
    border-radius: 12px;
    border-left: 5px solid #2563eb;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.highlight-icon {
    font-size: 1.8rem;
    margin-right: 20px;
    margin-top: 5px;
    color: #2563eb;
}

.highlight-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #2c3e50;
}

.highlight-content p {
    color: #5a6c7d;
    line-height: 1.6;
}

/* Screenshots Section */
.screenshots-section {
    background: white;
    border-radius: 12px;
    padding: 60px 40px;
    margin-bottom: 40px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.screenshot-item {
    text-align: center;
}

.screenshot-img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.12);
    transition: all 0.3s ease;
}

.screenshot-img:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 40px rgba(37, 99, 235, 0.18);
}

.screenshot-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 15px;
    color: #2c3e50;
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, #2563eb 0%, #1e40af 100%);
    color: white;
    text-align: center;
    padding: 80px 40px;
    border-radius: 12px;
    margin-bottom: 40px;
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.cta-section p {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.cta-large {
    background: white;
    color: #2563eb;
    padding: 20px 50px;
    font-size: 1.3rem;
    font-weight: 700;
    border-radius: 50px;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
}

.cta-large:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.2);
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px 20px;
    color: #6b7280;
    border-top: 1px solid #e5e7eb;
}

.footer p {
    margin-bottom: 8px;
}

.footer p:last-child {
    margin-bottom: 0;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .header a {
        margin-bottom: 15px;
    }
    
    .app-logo {
        width: 100px;
        height: 100px;
    }
    
    .header h1 {
        font-size: 2.5rem;
    }
    
    .header .subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .features-section,
    .highlights-section,
    .screenshots-section {
        padding: 40px 20px;
    }
    
    .highlight-item {
        flex-direction: column;
        text-align: center;
    }
    
    .highlight-icon {
        margin-right: 0;
        margin-bottom: 15px;
    }
}

@media (max-width: 480px) {
    .header a {
        margin-bottom: 12px;
    }
    
    .app-logo {
        width: 80px;
        height: 80px;
    }
    
    .container {
        padding: 10px;
    }
    
    .header {
        padding: 60px 20px;
    }
    
    .header h1 {
        font-size: 2rem;
    }
}