:root {
    --background-dark: #18181B;
    --surface-dark: #27272A;
    --border-dark: #333333;
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --primary-blue: #228BE6;
    --link-blue: #60A5FA;
    --success-green: #40C057;
    --warning-yellow: #FAB005;
    --danger-red: #FA5252;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #FFFFFF;
    color: #333333;
    line-height: 1.5;
}

/* 主内容区域 */
.main-content {
    margin-top: 108px;
    padding: 24px;
    max-width: 1920px;
    margin-left: auto;
    margin-right: auto;
}

/* 区域通用样式 */
.featured-section {
    margin-bottom: 48px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-left h2 {
    font-size: 24px;
    font-weight: 600;
}

.info-button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
}

.explore-link {
    color: var(--link-blue);
    text-decoration: none;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* 网格布局 */
.image-grid,
.model-grid,
.article-grid {
    display: grid;
    gap: 16px;
}

.image-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.model-grid {
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
}

.article-grid {
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
}

/* 响应式调整 */
@media (max-width: 1400px) {
    .image-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .model-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .article-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 1200px) {
    .image-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .model-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .image-grid,
    .model-grid,
    .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .main-content {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    .image-grid,
    .model-grid,
    .article-grid {
        grid-template-columns: 1fr;
    }
}

/* 顶部导航调整 */
.nav-top {
    background: #18181B;
    border-bottom: 1px solid #27272A;
}

.search-wrapper {
    background: #27272A;
    border: 1px solid #333333;
}

.shortcut-key {
    background: #333333;
    color: #666666;
    border-radius: 4px;
    padding: 2px 6px;
    margin-right: 8px;
}

.sign-in-btn {
    background: none;
    border: none;
    color: #FFFFFF;
    padding: 8px 16px;
}

.menu-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: none;
    color: #FFFFFF;
}

/* 通知横幅样式 */
.announcement-banner {
    background: #1E293B;
    border: 1px solid #3B82F6;
    border-radius: 8px;
    margin: 16px 24px;
    overflow: hidden;
}

.banner-content {
    display: flex;
    padding: 16px;
    align-items: center;
    gap: 16px;
}

.banner-image {
    width: 80px;
    height: 80px;
    border-radius: 8px;
}

.banner-text {
    flex: 1;
}

.banner-link {
    color: #60A5FA;
    text-decoration: none;
}

.start-btn {
    background: #3B82F6;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    margin-top: 8px;
}

.banner-progress {
    height: 4px;
    background: #27272A;
}

.progress-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 8px 0;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #4B5563;
}

.dot.active {
    background: #60A5FA;
}

/* Featured Images 部分调整 */
.section-header {
    margin-bottom: 12px;
}

.section-description {
    color: #A1A1AA;
    margin-bottom: 24px;
    max-width: 800px;
}

.explore-all {
    display: none;
}

@media (max-width: 768px) {
    .explore-link {
        display: none;
    }
    
    .explore-all {
        display: inline-block;
        color: #60A5FA;
        text-decoration: none;
        margin-top: 8px;
    }
}