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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
}

.header {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: #667eea;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.nav {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
}

.nav-link:hover {
    color: #667eea;
}

.nav-link.download-link {
    background: #667eea;
    color: white;
    padding: 10px 20px;
    border-radius: 20px;
}

.nav-link.download-link:hover {
    background: #5568d3;
    color: white;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 10px;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 10px;
}

.hero-content {
    display: flex;
    gap: 20px;
    align-items: center;
}

.hero-left {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.hero-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.hero-logo {
    width: 80px;
    height: 80px;
    flex-shrink: 0;
}

.hero-logo svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

.app-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.tagline {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 10px;
    opacity: 0.95;
}

.description {
    font-size: 1rem;
    font-weight: 400;
    max-width: 100%;
    margin-bottom: 10px;
    opacity: 0.9;
}

.download-section {
    margin-top: 10px;
}

.hero-right {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image {
    max-width: 500px;
    max-height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image img,
.hero-image svg {
    max-width: 100%;
    max-height: 500px;
    object-fit: contain;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

.hero-image svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

.download-btn {
    display: inline-block;
    background: white;
    color: #667eea;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.platform-info {
    margin-top: 10px;
    font-size: 0.875rem;
    font-weight: 400;
    opacity: 0.8;
}

.features {
    padding: 20px 10px;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #2d3748;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 10px;
    align-items: center;
}

.feature-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

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

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #2d3748;
}

.feature-card p {
    font-size: 0.9375rem;
    font-weight: 400;
    color: #718096;
    line-height: 1.8;
}

.screenshots {
    padding: 20px 10px;
}

.screenshots h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #2d3748;
}

.gallery-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 10px;
}

.gallery-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: #667eea;
    color: white;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.gallery-btn:hover {
    background: #5568d3;
    transform: scale(1.1);
}

.gallery-btn svg {
    width: 20px;
    height: 20px;
}

.gallery-main {
    flex: 1;
    max-width: 500px;
    text-align: center;
}

.main-image {
    width: 100%;
    max-width: 500px;
    height: auto;
    max-height: 500px;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.main-placeholder {
    width: 100%;
    max-width: 500px;
    height: auto;
    max-height: 500px;
    aspect-ratio: 4/3;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.main-placeholder svg {
    width: 100%;
    height: auto;
    max-height: 500px;
    object-fit: contain;
}

.main-caption {
    margin-top: 10px;
    font-size: 1rem;
    font-weight: 500;
    color: #2d3748;
}

.gallery-thumbnails {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.thumbnail {
    width: 192px;
    height: 144px;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all 0.3s ease;
    opacity: 0.6;
}

.thumbnail:hover {
    opacity: 0.8;
    transform: scale(1.05);
}

.thumbnail.active {
    border-color: #667eea;
    opacity: 1;
}

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

.thumbnail-placeholder {
    width: 100%;
    height: 100%;
    background: #e2e8f0;
}

.thumbnail-placeholder svg {
    width: 100%;
    height: 100%;
}

.testimonials {
    padding: 20px 10px;
    background: white;
}

.testimonials h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #2d3748;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 10px;
}

.articles {
    padding: 20px 10px;
    background: #f8f9fa;
}

.articles h2 {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #2d3748;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 10px;
}

.article-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    transition: transform 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.article-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #2d3748;
}

.article-card h3 a {
    color: inherit;
    text-decoration: none;
}

.article-card h3 a:hover {
    color: #667eea;
}

.article-meta {
    display: flex;
    gap: 15px;
    margin-bottom: 10px;
    font-size: 0.875rem;
    color: #718096;
}

.article-excerpt {
    font-size: 0.9375rem;
    color: #4a5568;
    line-height: 1.8;
    margin-bottom: 10px;
}

.article-readmore {
    display: inline-block;
    color: #667eea;
    font-weight: 500;
    text-decoration: none;
    font-size: 0.875rem;
}

.article-readmore:hover {
    text-decoration: underline;
}

.testimonial-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
}

.rating {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin-bottom: 10px;
}

.rating svg {
    width: 20px;
    height: 20px;
}

.testimonial-content {
    font-size: 0.9375rem;
    font-weight: 400;
    color: #4a5568;
    line-height: 1.8;
    margin-bottom: 10px;
    font-style: italic;
}

.testimonial-name {
    font-size: 1rem;
    font-weight: 600;
    color: #2d3748;
}

.footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 20px 10px;
}

.footer p {
    font-size: 0.875rem;
    font-weight: 400;
    opacity: 0.8;
}

@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
    }

    .hero-header {
        flex-direction: column;
        text-align: center;
    }

    .hero-logo {
        width: 80px;
        height: 80px;
        margin: 0 auto 10px;
    }

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

    .header-content {
        flex-direction: column;
        gap: 10px;
    }

    .nav {
        gap: 10px;
        font-size: 0.875rem;
    }

    .app-title {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1.125rem;
    }

    .hero {
        padding: 20px 10px;
    }

    .features,
    .screenshots,
    .testimonials {
        padding: 20px 10px;
    }

    .gallery-container {
        flex-direction: column;
        gap: 10px;
    }

    .gallery-btn {
        width: 32px;
        height: 32px;
    }

    .gallery-btn svg {
        width: 16px;
        height: 16px;
    }

    .gallery-thumbnails {
        gap: 10px;
    }

    .thumbnail {
        width: 128px;
        height: 96px;
    }

    .features-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}