/* 菜鸟教程风格首页 - 两栏 + 横向卡片 */
:root {
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --primary-bg: #e8f0fe;
    --bg-gray: #f5f5f5;
    --border: #e5e5e5;
    --text: #333;
    --text-gray: #666;
    --text-light: #999;
    --card-bg: #f6f6f6;
}

.tutorial-home {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    gap: 16px;
    padding: 20px 15px;
}

/* === 左侧分类 === */
.cat-sidebar {
    width: 176px;
    flex-shrink: 0;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 5px;
    align-self: flex-start;
    position: sticky;
    top: 72px;
}
.cat-header {
    font-size: 15px;
    font-weight: 700;
    padding: 12px 14px;
    color: var(--text);
    border-bottom: 1px solid var(--border);
}
.cat-list { list-style: none; margin: 0; padding: 0; }
.cat-item {
    padding: 10px 14px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-gray);
    border-left: 3px solid transparent;
    transition: all .15s;
    display: flex;
    align-items: center;
    gap: 8px;
}
.cat-item i { font-size: 15px; }
.cat-item:hover { background: var(--bg-gray); }
.cat-item.active {
    background: var(--primary-bg);
    border-left-color: var(--primary);
    color: var(--primary-dark);
    font-weight: 600;
}

/* === 右侧教程内容 === */
.tut-content { flex: 1; min-width: 0; }

.tut-section { margin-bottom: 24px; }
.tut-section-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    padding: 0 0 10px;
    margin-bottom: 14px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

/* === 横向卡片网格 3列 === */
.tut-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

/* === 横向卡片: icon左 + 文字右 === */
.tut-card {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    background: var(--card-bg);
    border: none;
    border-radius: 5px;
    text-decoration: none;
    color: var(--text);
    transition: box-shadow .2s, background .15s;
    gap: 12px;
}
.tut-card:hover {
    background: #eaeaea;
    box-shadow: 0 2px 8px rgba(0,0,0,.08);
}
.tut-card-icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary-dark);
}
.tut-card-icon img {
    width: 36px;
    height: 36px;
    object-fit: contain;
}
.tut-card-body {
    flex: 1;
    min-width: 0;
}
.tut-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.tut-card-desc {
    font-size: 12px;
    color: var(--text-light);
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 搜索无结果 */
.tut-empty {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-light);
}
.tut-empty i { font-size: 48px; display: block; margin-bottom: 16px; }
.tut-empty p { font-size: 16px; }

/* === 响应式 === */
@media (max-width: 992px) {
    .tut-grid { grid-template-columns: repeat(2, 1fr); }
    .cat-sidebar { display: none; }
}
@media (max-width: 767px) {
    .tutorial-home { flex-direction: column; gap: 12px; padding-top: 10px; }
    .cat-sidebar {
        width: 100%;
        position: static;
        display: block;
        border: none;
        background: transparent;
    }
    .cat-header { display: none; }
    .cat-list {
        display: flex;
        overflow-x: auto;
        white-space: nowrap;
        padding: 0 4px;
        gap: 4px;
        background: #fff;
        border-radius: 5px;
        border: 1px solid var(--border);
    }
    .cat-item {
        padding: 8px 12px;
        border-left: none;
        border-bottom: 2px solid transparent;
    }
    .cat-item.active {
        border-left: none;
        border-bottom-color: var(--primary);
    }
    .tut-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .tut-card { padding: 8px 12px; }
    .tut-card-icon { width: 30px; height: 30px; font-size: 16px; }
    .tut-card-icon img { width: 30px; height: 30px; }
    .tut-card-title { font-size: 13px; }
    .tut-card-desc { font-size: 11px; }
    .tut-section-title { font-size: 15px; }
}