/* PPT压缩器页面样式 - 仅SEO内容区域 */

/* SEO内容区域 */
.seo-content {
    margin-top: 4rem;
    margin-bottom: 2rem;
    text-align: center;
    padding: 3rem 2rem;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #cbd5e1 100%);
    border-radius: 24px;
    color: var(--gray-800);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--gray-200);
}

.seo-content::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="%236b7280" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="%236b7280" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="%236b7280" opacity="0.1"/><circle cx="10" cy="60" r="0.5" fill="%236b7280" opacity="0.1"/><circle cx="90" cy="40" r="0.5" fill="%236b7280" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.4;
}

.seo-content h1 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--gray-900);
    margin: 0 0 1rem 0;
    line-height: 1.1;
    position: relative;
    z-index: 1;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.seo-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
    margin: 0 0 1rem 0;
    line-height: 1.2;
    position: relative;
    z-index: 1;
}

.seo-content h3 {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--gray-700);
    margin: 0 0 2rem 0;
    line-height: 1.3;
    position: relative;
    z-index: 1;
}

.seo-description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-600);
    max-width: 800px;
    margin: 0 auto 3rem;
    position: relative;
    z-index: 1;
}

/* 格式网格 */
.format-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
    position: relative;
    z-index: 1;
}

.format-card {
    background: white;
    border-radius: 16px;
    padding: 1.5rem;
    text-align: left;
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.format-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, #8b5cf6 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.format-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
}

.format-card:hover::before {
    opacity: 1;
}

.format-card h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0 0 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.format-card p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin: 0 0 1rem 0;
    line-height: 1.5;
}

.format-ext {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 功能特点列表 */
.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.75rem;
    margin: 2rem 0;
    list-style: none;
    padding: 0;
    position: relative;
    z-index: 1;
}

.features-list li {
    background: white;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
    font-size: 0.875rem;
    color: var(--gray-700);
    position: relative;
    overflow: hidden;
}

.features-list li::before {
    content: '✓';
    color: var(--primary);
    font-weight: bold;
    margin-right: 0.5rem;
}

.features-list li:hover {
    background: var(--primary);
    color: white;
    transform: translateX(4px);
}

.features-list li:hover::before {
    color: white;
}

/* 使用场景 */
.use-cases {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
    position: relative;
    z-index: 1;
}

.use-case {
    background: white;
    border-radius: 16px;
    padding: 1.5rem;
    text-align: left;
    border: 1px solid var(--gray-200);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.use-case::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #10b981 0%, #059669 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.use-case:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: #10b981;
}

.use-case:hover::before {
    opacity: 1;
}

.use-case h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0 0 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.use-case p {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin: 0;
    line-height: 1.5;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .seo-content {
        padding: 2rem 1rem;
        margin-top: 2rem;
    }
    
    .seo-content h1 {
        font-size: 1.75rem;
    }
    
    .seo-content h2 {
        font-size: 1.25rem;
    }
    
    .seo-content h3 {
        font-size: 1.1rem;
    }
    
    .format-grid,
    .use-cases {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .features-list {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .format-card,
    .use-case {
        padding: 1rem;
    }
}