/* ============================================================
 * 首页轮播图 + Hero 区域
 * ============================================================ */

/* 轮播图容器 */
.carousel {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin-bottom: var(--space-xl);
    background: var(--color-bg-2);
    border: 1px solid var(--color-border);
}

/* 轮播轨道 */
.carousel-track {
    display: flex;
    transition: transform 0.6s var(--ease-snappy);
}

/* 单个轮播项 */
.carousel-slide {
    min-width: 100%;
    height: 360px;
    position: relative;
    display: flex;
    align-items: center;
}

/* 轮播背景图 */
.carousel-slide .slide-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.carousel-slide .slide-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.4;
}

/* 轮播遮罩 — 左到右渐变 */
.carousel-slide .slide-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, var(--color-bg-2) 0%, rgba(28, 32, 40, 0.85) 50%, transparent 100%);
}

/* 轮播内容 */
.carousel-content {
    position: relative;
    z-index: 2;
    padding: 0 var(--space-2xl);
    max-width: 600px;
}

.carousel-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 14px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: var(--space-md);
    letter-spacing: 0.03em;
}

.carousel-tag.tag-green {
    background: var(--color-green-light);
    color: var(--color-green);
}

.carousel-tag.tag-orange {
    background: var(--color-orange-light);
    color: var(--color-orange);
}

.carousel-content h2 {
    font-size: 32px;
    font-weight: 900;
    margin-bottom: var(--space-sm);
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.carousel-content p {
    font-size: 15px;
    color: var(--color-text-2);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.carousel-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s var(--ease-snappy);
}

.carousel-btn.btn-green {
    background: var(--color-green);
    color: var(--color-bg);
}

.carousel-btn.btn-green:hover {
    background: var(--color-green-dark);
    color: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-green);
}

.carousel-btn.btn-orange {
    background: var(--color-orange);
    color: var(--color-bg);
}

.carousel-btn.btn-orange:hover {
    background: var(--color-orange-dark);
    color: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-orange);
}

/* 轮播指示器 */
.carousel-indicators {
    position: absolute;
    bottom: var(--space-md);
    right: var(--space-xl);
    display: flex;
    gap: var(--space-sm);
    z-index: 3;
}

.carousel-indicators .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-text-4);
    cursor: pointer;
    transition: all 0.3s var(--ease-smooth);
}

.carousel-indicators .dot.active {
    width: 28px;
    border-radius: var(--radius-full);
    background: var(--color-green);
}

/* 轮播箭头 */
.carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(15, 17, 21, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    cursor: pointer;
    z-index: 3;
    transition: all 0.25s var(--ease-smooth);
    border: 1px solid var(--color-border);
}

.carousel-arrow:hover {
    background: var(--color-green);
    color: var(--color-bg);
    border-color: var(--color-green);
}

.carousel-arrow.prev {
    left: var(--space-md);
}

.carousel-arrow.next {
    right: var(--space-md);
}

/* ============================================================
 * 广告位（4个固定）
 * ============================================================ */

.ad-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.ad-item {
    background: var(--color-bg-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    transition: all 0.3s var(--ease-snappy);
}

.ad-item:hover {
    border-color: var(--color-border-2);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    background: var(--color-bg-3);
}

.ad-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.ad-icon.green {
    background: var(--color-green-light);
    color: var(--color-green);
}

.ad-icon.orange {
    background: var(--color-orange-light);
    color: var(--color-orange);
}

.ad-text {
    display: flex;
    flex-direction: column;
}

.ad-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-text);
}

.ad-desc {
    font-size: 12px;
    color: var(--color-text-3);
    margin-top: 2px;
}

/* ============================================================
 * 特性介绍区
 * ============================================================ */

.features-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.feature-card {
    background: var(--color-bg-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all 0.3s var(--ease-snappy);
}

.feature-card:hover {
    border-color: var(--color-border-2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-card .feature-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
    font-size: 22px;
}

.feature-card .feature-icon.green {
    background: var(--color-green-light);
    color: var(--color-green);
}

.feature-card .feature-icon.orange {
    background: var(--color-orange-light);
    color: var(--color-orange);
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
}

.feature-card p {
    font-size: 13px;
    color: var(--color-text-3);
    line-height: 1.6;
}

/* ============================================================
 * 精选教程区 — 多列列表样式（带标签点缀）
 * ============================================================ */

.article-section {
    margin-bottom: var(--space-2xl);
}

.featured-articles {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
}

.featured-article-item {
    display: flex;
    align-items: stretch;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all 0.3s var(--ease-snappy);
}

.featured-article-item:hover {
    border-color: var(--color-green);
    background: var(--color-bg-3);
    transform: translateX(4px);
}

/* 左侧缩略图 */
.featured-article-thumb {
    width: 90px;
    height: 70px;
    border-radius: var(--radius);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--color-bg-1);
}

.featured-article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.featured-article-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-article-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.featured-article-item:hover .featured-article-title {
    color: var(--color-green);
}

.featured-article-summary {
    font-size: 12px;
    color: var(--color-text-3);
    line-height: 1.5;
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.featured-article-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 11px;
    color: var(--color-text-4);
    flex-wrap: wrap;
}

.featured-article-meta span {
    display: flex;
    align-items: center;
    gap: 3px;
}

/* tags 标签 — 四色轮询，跟在日期后面 */
.featured-article-meta em {
    font-style: normal;
    padding: 1px 6px;
    border-radius: var(--radius-sm);
    font-size: 10px;
    font-weight: 600;
}

/* 赤 */
.featured-article-meta .tag-red {
    background: rgba(239, 68, 68, 0.12);
    color: #f87171;
}
/* 橙 */
.featured-article-meta .tag-orange {
    background: rgba(245, 158, 11, 0.12);
    color: var(--color-orange);
}
/* 青 */
.featured-article-meta .tag-cyan {
    background: rgba(6, 182, 212, 0.12);
    color: #22d3ee;
}
/* 紫 */
.featured-article-meta .tag-purple {
    background: rgba(168, 85, 247, 0.12);
    color: #c084fc;
}

.featured-article-arrow {
    font-size: 20px;
    color: var(--color-text-4);
    flex-shrink: 0;
    transition: all 0.25s var(--ease-smooth);
}

.featured-article-item:hover .featured-article-arrow {
    color: var(--color-green);
    transform: translateX(4px);
}

/* ============================================================
 * 实用工具区 — 紧凑商品横排卡片
 * ============================================================ */

.tools-section {
    margin-bottom: var(--space-2xl);
}

.tools-product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.tool-product-card {
    display: flex;
    align-items: stretch;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all 0.3s var(--ease-snappy);
    overflow: hidden;
    min-width: 0;
}

.tool-product-card:hover {
    border-color: var(--color-orange);
    background: var(--color-bg-3);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* 缩略图 */
.tool-product-thumb {
    width: 64px;
    height: 64px;
    border-radius: var(--radius);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--color-bg-1);
}

.tool-product-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.tool-product-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.tool-product-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tool-product-card:hover .tool-product-title {
    color: var(--color-orange);
}

.tool-product-desc {
    font-size: 12px;
    color: var(--color-text-3);
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-bottom: 4px;
}

.tool-product-meta {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.tool-product-price {
    font-size: 15px;
    font-weight: 800;
    color: var(--color-orange);
}

.tool-product-price.free {
    color: var(--color-green);
}

.tool-product-download {
    font-size: 11px;
    color: var(--color-text-4);
    display: flex;
    align-items: center;
    gap: 3px;
}

/* 响应式 */
@media (max-width: 768px) {
    .featured-articles { grid-template-columns: 1fr; }
    .tools-product-grid { grid-template-columns: repeat(2, 1fr); }
}