/* ========================================================
   css/left.css - 左侧单窗口树状手风琴与卡片规范 (遵照 SITE_ARCHITECTURE.md)
   ======================================================== */

.list-panel {
    position: fixed;
    top: 46px;
    bottom: 0;
    left: 0;
    width: 320px;
    max-width: 85vw;
    z-index: 850;
    background-color: var(--bg-main);
    border-right: 1px solid var(--border-color);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.65);
    transform: translateX(-100%);
    transition: transform 0.24s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.list-panel.open {
    transform: translateX(0);
}

/* 列表栏滚动容器 (单窗口无跳转滚动) */
.list-panel-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

/* 一级大分类顶级手风琴块 (我的音乐库 / 区域 / 数据管理) */
.top-accordion-block {
    border-bottom: 1px solid var(--border-color);
}

.top-accordion-hdr {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    background-color: #161b22;
    border-bottom: 1px solid var(--border-subtle);
    cursor: pointer;
    user-select: none;
    transition: background-color 0.15s ease;
    position: sticky;
    top: 0;
    z-index: 10;
}

.top-accordion-hdr:hover {
    background-color: #1c222b;
}

.top-accordion-left {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: var(--fs-t2);
    font-weight: 700;
    color: var(--accent-apple);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.top-accordion-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 12px;
    color: var(--text-muted);
    transition: color 0.15s ease;
}

.top-accordion-hdr.open .top-accordion-arrow,
.top-accordion-arrow.open {
    color: var(--accent-apple) !important;
}

.top-accordion-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

.lib-tool-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 2px 5px;
    border-radius: 3px;
    cursor: pointer;
    font-size: var(--fs-t2);
    font-weight: 700;
    line-height: 1;
    transition: color 0.15s ease, background-color 0.15s ease;
}

.lib-tool-btn:hover {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.08);
}

.top-accordion-body {
    display: none;
    background-color: var(--bg-main);
}

.top-accordion-body.open {
    display: block;
}

/* 紧凑微型地区下拉选择器 (极简无边框，释放最大纵向空间) */
.region-micro-select {
    background-color: var(--bg-main);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 2px 6px;
    font-size: var(--fs-t4);
    outline: none;
    cursor: pointer;
    line-height: 1.2;
}

.region-micro-select:hover {
    border-color: var(--accent);
}

/* 二级子板块吸顶手风琴 (如：焦点推荐、本周新发行、国语流行、排行榜...) */
.sub-accordion-block {
    border-bottom: 1px solid var(--border-subtle);
}

.sub-accordion-hdr {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    background-color: #13171e;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    border-bottom: 1px solid var(--border-subtle);
    cursor: pointer;
    user-select: none;
    transition: background 0.15s ease;
    font-size: var(--fs-t3);
    font-weight: 600;
    color: var(--text-secondary);
}

.sub-accordion-hdr:hover {
    background-color: #1a202a;
    color: var(--text-primary);
}

.sub-accordion-hdr.level-3 {
    padding-left: 18px;
    background-color: #11141a;
    font-size: var(--fs-t3);
    font-weight: 500;
}

.sub-accordion-left {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sub-accordion-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 10px;
    color: var(--text-muted);
    transition: color 0.15s ease;
}

.sub-accordion-hdr.open .sub-accordion-arrow,
.sub-accordion-arrow.open {
    color: var(--accent-apple) !important;
}

.sub-accordion-body {
    display: none;
    background-color: var(--bg-main);
}

.sub-accordion-body.open {
    display: block;
}

.count-badge {
    background-color: rgba(255, 255, 255, 0.06);
    color: var(--text-muted);
    border-radius: 10px;
    padding: 1px 6px;
    font-size: var(--fs-t4);
    font-family: var(--font-mono);
}

/* ========================================================
   卡片规范 (脱水清洗、去除 🔗 官方精选、纯图标操作)
   ======================================================== */
.playlist-card {
    padding: 6px 10px;
    border-bottom: 1px solid var(--border-subtle);
    cursor: pointer;
    background-color: var(--bg-surface);
    display: flex;
    flex-direction: column;
    gap: 2px;
    transition: background-color 0.15s ease;
}

.playlist-card:hover {
    background-color: var(--bg-surface-hover);
}

.playlist-card.active {
    background-color: rgba(88, 166, 255, 0.1);
    border-left: 2px solid var(--accent);
}

/* 第一行：类型标签 + 标题 (左) + 纯图标操作 (右) */
.playlist-card-row1 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
}

.playlist-card-title-group {
    display: flex;
    align-items: baseline;
    gap: 4px;
    overflow: hidden;
    flex: 1;
}

.playlist-type-tag {
    font-size: var(--fs-t4);
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
}

.playlist-name {
    font-size: var(--fs-t2);
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.playlist-card-actions {
    display: flex;
    align-items: center;
    gap: 3px;
    flex-shrink: 0;
}

.btn-card-action {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 2px 4px;
    border-radius: 3px;
    cursor: pointer;
    font-size: var(--fs-t3);
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.btn-card-action:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-card-action.fav.active {
    color: var(--accent-apple);
}

.btn-card-action.btn-del:hover {
    color: #ff7588;
}

/* 第二行：清洗后的歌手/策划人 + 真实曲目数 */
.playlist-card-row2 {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    font-size: var(--fs-t3);
    color: var(--text-muted);
}

.playlist-curator {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.playlist-track-badge {
    font-size: var(--fs-t4);
    font-family: var(--font-mono);
    color: var(--text-muted);
    flex-shrink: 0;
}

/* 数据管理操作行 (↑ 导出 / ↓ 导入) */
.data-backup-row {
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
}

.btn-data-action {
    flex: 1;
    background-color: var(--bg-surface-hover);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    padding: 5px 8px;
    font-size: var(--fs-t3);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    transition: all 0.15s ease;
}

.btn-data-action:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* 我的音乐库分类行 */
.library-group-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px 6px 14px;
    background-color: #141820;
    border-bottom: 1px solid var(--border-subtle);
    font-size: var(--fs-t3);
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
    transition: background 0.15s ease;
}

.library-group-row:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
}

.library-group-left {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.library-group-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 10px;
    color: var(--text-muted);
    transition: color 0.15s ease;
}

.library-group-row.open .library-group-arrow,
.library-group-arrow.open {
    color: var(--accent-apple) !important;
}

.library-group-actions {
    display: flex;
    align-items: center;
    gap: 2px;
}

.btn-group-action {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 3px;
    font-size: var(--fs-t3);
    line-height: 1;
}

.btn-group-action:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-group-action.btn-del:hover {
    color: #ff7588;
}

.library-group-body {
    display: none;
    background-color: var(--bg-main);
}

.library-group-body.open {
    display: block;
}