/**
 * ====================================================================
 * A5ziyuan-Child 首页栏目样式 v2
 * 教程体系 / 案例拆解 / 资源中心
 * --------------------------------------------------------------------
 * v2 改动说明：
 *   - 整体缩小尺寸，避免压制下方已有的「小红泡核心优势」等区块
 *   - 区块标题居中显示，与已有 a5-section-header 风格统一
 *   - 资源中心改为圆形图标 + 居中布局，更紧凑
 *   - 修复 color-mix 兼容性回退（旧浏览器降级）
 *
 * 依赖子比父主题 CSS 变量：
 *   --main-color / --hover-color / --text-color / --bg-color
 * ====================================================================
 */

/* ============================================================
 * 0. 栏目通用容器（v2 紧凑版）
 * ============================================================ */
.a5-home-section {
    width: 100%;
    margin: 0 auto;
    padding: 18px 0;
    background: transparent;
}

.a5-sec-inner {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 16px;
    box-sizing: border-box;
}

/* 区块头部 - 居中风格，与下方小红泡区块保持一致 */
.a5-sec-head {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    flex-wrap: wrap;
    gap: 10px;
    text-align: center;
    position: relative;
}

.a5-sec-head-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.a5-sec-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: color-mix(in srgb, var(--main-color, #3b82f6) 12%, transparent);
    color: var(--main-color, #3b82f6);
    font-size: 16px;
    flex-shrink: 0;
}

/* 兼容旧浏览器：color-mix 不支持时降级为浅蓝背景 */
@supports not (background: color-mix(in srgb, red 12%, transparent)) {
    .a5-sec-icon {
        background: rgba(59, 130, 246, 0.12);
    }
}

.a5-sec-head-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.a5-sec-title {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-color, #222);
    line-height: 1.3;
}

.a5-sec-subtitle {
    margin: 0;
    font-size: 12.5px;
    color: var(--text-color, #666);
    opacity: 0.7;
    line-height: 1.4;
}

/* 「查看更多」放右上角绝对定位 */
.a5-sec-more {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
    color: var(--main-color, #3b82f6);
    background: color-mix(in srgb, var(--main-color, #3b82f6) 8%, transparent);
    border: 1px solid color-mix(in srgb, var(--main-color, #3b82f6) 18%, transparent);
    text-decoration: none;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.a5-sec-more:hover {
    background: var(--main-color, #3b82f6);
    color: #fff;
}

.a5-sec-more i {
    transition: transform 0.25s ease;
}

.a5-sec-more:hover i {
    transform: translateX(3px);
}

/* ============================================================
 * 1. 教程体系 - 卡片网格（v2 紧凑）
 * ============================================================ */
.a5-tutorials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 12px;
}

.a5-tutorial-card {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px;
    border-radius: var(--a5-radius, 12px);
    background: var(--bg-color, #fff);
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    text-decoration: none;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.a5-tutorial-card::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--card-color);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.3s ease;
}

.a5-tutorial-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 22px rgba(0, 0, 0, 0.08);
    border-color: color-mix(in srgb, var(--card-color) 35%, transparent);
}

.a5-tutorial-card:hover::before {
    transform: scaleY(1);
}

.a5-tutorial-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: color-mix(in srgb, var(--card-color) 14%, transparent);
    color: var(--card-color);
    font-size: 18px;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.a5-tutorial-card:hover .a5-tutorial-icon {
    transform: rotate(-6deg) scale(1.05);
}

.a5-tutorial-info {
    flex: 1;
    min-width: 0;
}

.a5-tutorial-title {
    margin: 0 0 4px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-color, #222);
    line-height: 1.4;
}

.a5-tutorial-desc {
    margin: 0 0 8px;
    font-size: 12px;
    color: var(--text-color, #666);
    opacity: 0.7;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.a5-tutorial-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    font-size: 11.5px;
}

.a5-tutorial-count {
    color: var(--text-color, #666);
    opacity: 0.6;
}

.a5-tutorial-go {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-weight: 600;
    color: var(--card-color);
}

.a5-tutorial-go i {
    transition: transform 0.25s ease;
}

.a5-tutorial-card:hover .a5-tutorial-go i {
    transform: translateX(3px);
}

.a5-tutorial-number {
    position: absolute;
    top: 6px;
    right: 10px;
    font-size: 28px;
    font-weight: 800;
    color: var(--card-color);
    opacity: 0.08;
    line-height: 1;
    font-family: 'Georgia', serif;
    pointer-events: none;
}

/* ============================================================
 * 2. 案例拆解 - 文章卡片（v2 紧凑）
 * ============================================================ */
.a5-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 14px;
}

.a5-case-card {
    display: flex;
    flex-direction: column;
    border-radius: var(--a5-radius, 12px);
    background: var(--bg-color, #fff);
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.a5-case-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.a5-case-thumb {
    position: relative;
    display: block;
    padding-top: 56.25%;
    width: 100%;
    overflow: hidden;
    background: #f3f4f6;
}

.a5-case-thumb img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.a5-case-card:hover .a5-case-thumb img {
    transform: scale(1.06);
}

.a5-case-thumb-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f3f4f6, #e5e7eb);
    color: #9ca3af;
    font-size: 28px;
}

.a5-case-tag {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 3px 9px;
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    font-size: 11.5px;
    font-weight: 600;
    backdrop-filter: blur(4px);
}

.a5-case-body {
    padding: 12px 14px 14px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
}

.a5-case-title {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
    line-height: 1.45;
}

.a5-case-title a {
    color: var(--text-color, #222);
    text-decoration: none;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.25s ease;
}

.a5-case-title a:hover {
    color: var(--main-color, #3b82f6);
}

.a5-case-excerpt {
    margin: 0;
    font-size: 12.5px;
    color: var(--text-color, #666);
    opacity: 0.75;
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.a5-case-foot {
    margin-top: auto;
    padding-top: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px dashed rgba(0, 0, 0, 0.08);
    font-size: 11.5px;
}

.a5-case-date {
    color: var(--text-color, #999);
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.a5-case-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-weight: 600;
    color: var(--main-color, #3b82f6);
    text-decoration: none;
    transition: gap 0.25s ease;
}

.a5-case-link:hover {
    gap: 7px;
}

/* ============================================================
 * 3. 资源中心 - 紧凑圆形图标网格（v2 改进）
 * ============================================================ */
.a5-resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 10px;
}

.a5-resource-card {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 6px;
    padding: 14px 10px;
    border-radius: var(--a5-radius, 12px);
    background: var(--bg-color, #fff);
    border: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: 0 2px 8px rgba(0, 0,0,0.03);
    text-decoration: none;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    overflow: hidden;
}

.a5-resource-card::after {
    content: "";
    position: absolute;
    right: -30px;
    bottom: -30px;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--card-color);
    opacity: 0.06;
    transition: transform 0.4s ease, opacity 0.4s ease;
}

.a5-resource-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
    border-color: color-mix(in srgb, var(--card-color) 40%, transparent);
}

.a5-resource-card:hover::after {
    transform: scale(1.6);
    opacity: 0.12;
}

.a5-resource-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: color-mix(in srgb, var(--card-color) 15%, transparent);
    color: var(--card-color);
    font-size: 18px;
    transition: transform 0.3s ease;
}

.a5-resource-card:hover .a5-resource-icon {
    transform: scale(1.1) rotate(-5deg);
}

.a5-resource-title {
    margin: 0;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-color, #222);
}

.a5-resource-count {
    font-size: 11.5px;
    color: var(--text-color, #999);
}

.a5-resource-arrow {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--card-color) 12%, transparent);
    color: var(--card-color);
    font-size: 10px;
    opacity: 0;
    transform: translateX(-6px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.a5-resource-card:hover .a5-resource-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================================
 * 4. 入场动画
 * ============================================================ */
.a5-anim-in {
    opacity: 0;
    transform: translateY(20px);
    animation: a5FadeUp 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.a5-anim-in .a5-tutorial-card,
.a5-anim-in .a5-case-card,
.a5-anim-in .a5-resource-card {
    opacity: 0;
    transform: translateY(16px);
    animation: a5FadeUp 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes a5FadeUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 尊重「减少动画」偏好 */
@media (prefers-reduced-motion: reduce) {
    .a5-anim-in,
    .a5-anim-in .a5-tutorial-card,
    .a5-anim-in .a5-case-card,
    .a5-anim-in .a5-resource-card {
        animation: none;
        opacity: 1;
        transform: none;
    }
}

/* ============================================================
 * 5. 响应式适配（v2 调整）
 * ============================================================ */
@media (max-width: 768px) {
    .a5-home-section {
        padding: 14px 0;
    }

    .a5-sec-title {
        font-size: 16px;
    }

    .a5-sec-subtitle {
        font-size: 11.5px;
    }

    .a5-sec-icon {
        width: 32px;
        height: 32px;
        font-size: 15px;
    }

    .a5-sec-more {
        position: static;
        transform: none;
        margin-top: 4px;
    }

    .a5-sec-head {
        flex-direction: column;
    }

    .a5-tutorials-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 10px;
    }

    .a5-tutorial-card {
        padding: 12px;
    }

    .a5-tutorial-icon {
        width: 38px;
        height: 38px;
        font-size: 16px;
    }

    .a5-cases-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .a5-resources-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 8px;
    }

    .a5-resource-card {
        padding: 12px 6px;
    }

    .a5-resource-title {
        font-size: 12.5px;
    }
}

@media (max-width: 480px) {
    .a5-tutorials-grid {
        grid-template-columns: 1fr;
    }

    .a5-resources-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ============================================================
 * 6. 暗黑模式适配
 * ============================================================ */
body.dark-theme .a5-tutorial-card,
body.dark-theme .a5-case-card,
body.dark-theme .a5-resource-card {
    background: rgba(40, 44, 52, 0.6);
    border-color: rgba(255, 255, 255, 0.08);
}

body.dark-theme .a5-case-thumb-placeholder {
    background: linear-gradient(135deg, #2a2d33, #1f2227);
    color: #6b7280;
}

body.dark-theme .a5-case-foot {
    border-top-color: rgba(255, 255, 255, 0.08);
}