/* songs.html 专用样式
   v2026.07.04：重构为 Spotify/Apple Music 卡片网格
   v2026.07.09  v5.6.0.8 B 档 UI 一锅端整版重做:
       - 删除 sidebar (220px 侧栏) → 改为顶部横向 tag-chips 切换条
       - 11 个 tag 改 HTML5 <details> 折叠面板,默认折叠前 2 个
       - 每个 panel 内 column-count: 2 双列瀑布流(原生 CSS,0 依赖)
       - 每个 panel 12 首分段渲染(加载更多按钮),告别 334 DOM 一次性塞
       - 移动端 column-count: 1 单列
*/

.page-main {
    margin-top: 80px;
    margin-bottom: 100px;
    max-width: 1400px;
    margin-left: auto;
    margin-right: auto;
    padding: 40px 24px;
}

.page-header {
    margin-bottom: 32px;
    text-align: center;
}

.page-title {
    font-size: 2em;
    font-weight: 800;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary) 0%, #a78bfa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-sub {
    color: var(--text-2);
    font-size: 0.95em;
}

/* ============ 横向 tag 切换条 (v5.6.0.8) ============ */
.tag-chips-bar {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.tag-chips-scroll {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    scrollbar-width: thin;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
}

.tag-chips-scroll::-webkit-scrollbar {
    height: 6px;
}

.tag-chips-scroll::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.tag-chip {
    flex-shrink: 0;
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-2);
    font-size: 0.85em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.tag-chip:hover {
    border-color: var(--primary);
    color: var(--text);
    background: var(--bg-card-hover);
}

.tag-chip .chip-count {
    opacity: 0.6;
    margin-left: 4px;
    font-size: 0.9em;
}

/* ============ 排序 (v5.6.0.8) ============ */
.sort-bar {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 24px;
    padding: 12px 0;
    color: var(--text-2);
    font-size: 0.88em;
}

.sort-bar .sort-label {
    opacity: 0.7;
}

.sort-bar label {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
}

.sort-bar input[type="radio"] {
    accent-color: var(--primary);
    width: 14px;
    height: 14px;
    cursor: pointer;
}

/* ============ 搜索栏 ============ */
.search-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
}

.search-bar input {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 10px 18px;
    color: var(--text);
    font-size: 0.9em;
    outline: none;
    transition: border-color 0.2s;
}

.search-bar input:focus {
    border-color: var(--primary);
}

.search-bar input::placeholder {
    color: var(--text-3);
}

.search-bar button {
    background: var(--primary);
    border: none;
    border-radius: 24px;
    padding: 10px 18px;
    color: white;
    cursor: pointer;
    font-size: 0.9em;
    transition: opacity 0.2s;
}

.search-bar button:hover {
    opacity: 0.85;
}

/* v2026.08.02 找歌功能：清空按钮 + 联想下拉 + 结果数提示 */
.search-bar { position: relative; }
.search-bar .clear-btn {
    background: transparent !important;
    color: var(--text-3) !important;
    padding: 10px 12px !important;
    font-size: 1em !important;
}
.search-bar .clear-btn:hover { color: var(--primary) !important; opacity: 1 !important; }

.search-suggest {
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    right: 64px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    max-height: 280px;
    overflow-y: auto;
    z-index: 100;
}
.search-suggest-item {
    padding: 10px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    font-size: 0.9em;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}
.search-suggest-item:last-child { border-bottom: none; }
.search-suggest-item:hover { background: rgba(255, 87, 34, 0.06); }
.search-suggest-item .ss-cat {
    margin-left: auto;
    font-size: 11px;
    color: var(--text-3);
    background: var(--bg-page, #f5f5f5);
    padding: 2px 8px;
    border-radius: 4px;
}
.search-suggest-empty {
    padding: 14px 16px;
    color: var(--text-3);
    font-size: 0.85em;
    text-align: center;
}

.search-result-info {
    padding: 10px 16px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    border-left: 3px solid var(--primary);
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--text);
}
.search-result-info strong { color: var(--primary); }
.search-result-info .reset-link {
    margin-left: 12px;
    cursor: pointer;
    color: var(--text-3);
    font-size: 0.85em;
    text-decoration: underline;
}

/* ============ tag 折叠面板容器 ============ */
.tag-panels {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tag-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color 0.2s;
}

.tag-panel[open] {
    border-color: rgba(124, 58, 237, 0.35);
}

.tag-panel > summary {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 16px 20px;
    user-select: none;
    transition: background 0.2s;
}

.tag-panel > summary::-webkit-details-marker {
    display: none;
}

.tag-panel > summary:hover {
    background: var(--bg-card-hover);
}

.tag-panel-name {
    font-size: 1.05em;
    font-weight: 700;
    color: var(--text);
    flex: 1;
}

.tag-panel-count {
    font-size: 0.82em;
    color: var(--text-2);
    opacity: 0.7;
    margin-right: 12px;
}

.tag-panel-chevron {
    color: var(--text-2);
    font-size: 1.4em;
    line-height: 1;
    transition: transform 0.25s ease;
    display: inline-block;
}

.tag-panel[open] > summary .tag-panel-chevron {
    transform: rotate(-180deg);
    color: var(--primary);
}

/* ============ v2026.07.19 23:11 P0-G UI 重构:瀑布流 + 浮动分类标签云 ============ */
/* 浮动分类标签云:粘性顶部 */
.tag-chips-bar {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(20, 10, 30, 0.92);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    padding: 10px 0;
    margin: -8px -8px 16px -8px;
    padding-left: 8px;
    padding-right: 8px;
}

/* 激活状态的 tag chip */
.tag-chip.active {
    background: linear-gradient(135deg, var(--primary) 0%, #a855f7 100%);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(124, 58, 237, 0.35);
}
.tag-chip.active .chip-count {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
}

/* 单列瀑布流:CSS column-count 原生,零依赖 */
.waterfall-grid {
    column-count: 2;
    column-gap: 18px;
    padding: 8px 4px 32px;
}

/* 防卡片被拆开跨列 */
.waterfall-grid .song-card {
    break-inside: avoid;
    page-break-inside: avoid;
    -webkit-column-break-inside: avoid;
    margin-bottom: 18px;
    display: inline-block;
    width: 100%;
}

/* 加载更多按钮(瀑布流风格) */
.load-more-wrap {
    break-inside: avoid;
    text-align: center;
    margin: 24px 0;
    padding: 16px;
}
.load-more-btn {
    display: inline-block;
    padding: 12px 36px;
    background: transparent;
    color: var(--primary);
    border: 1px dashed var(--border);
    border-radius: 24px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    transition: all 0.2s;
}
.load-more-btn:hover {
    background: rgba(124, 58, 237, 0.1);
    border-color: var(--primary);
    border-style: solid;
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.25);
}

/* 响应式:移动端 1 列 */
@media (max-width: 900px) {
    .waterfall-grid { column-count: 1; }
}
@media (min-width: 1600px) {
    .waterfall-grid { column-count: 3; }
}

.tag-load-more {
    display: block;
    width: calc(100% - 40px);
    margin: 8px 20px 20px;
    padding: 10px 16px;
    background: transparent;
    color: var(--primary);
    border: 1px dashed var(--border);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s;
}

.tag-load-more:hover {
    background: rgba(124, 58, 237, 0.08);
    border-color: var(--primary);
    color: #fff;
}

/* ============ 全量渲染兼容 (.songs-grid-full 保留供 fallback) ============ */
.songs-grid-full {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 24px;
}

/* ============ 歌曲卡片 (复用 v2026.07.04 设计) ============ */
.song-card {
    background: var(--bg-card);
    border: 1px solid transparent;
    border-radius: 12px;
    padding: 14px;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
}

.song-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
    border-color: rgba(124, 58, 237, 0.2);
}

.sc-cover {
    position: relative;
    aspect-ratio: 1 / 1;
    width: 100%;
    border-radius: 8px;
    overflow: hidden;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    margin-bottom: 12px;
}

.sc-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.song-card:hover .sc-cover-img {
    transform: scale(1.06);
}

.sc-cover-fallback {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3em;
    color: var(--primary);
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.sc-play-btn {
    position: absolute;
    bottom: 8px;
    right: 8px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    border: none;
    font-size: 1.05em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.35);
    opacity: 0;
    transform: translateY(8px);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.song-card:hover .sc-play-btn {
    opacity: 1;
    transform: translateY(0);
}

.sc-play-btn:hover {
    transform: scale(1.08);
    background: var(--primary-hover, #6d28d9);
}

/* v5.7.0 全屏歌词按钮 - 位于封面左上角，hover 才显示 */
.sc-lyrics-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateY(-4px);
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.song-card:hover .sc-lyrics-btn {
    opacity: 1;
    transform: translateY(0);
}

.sc-lyrics-btn:hover {
    background: rgba(91, 76, 214, 0.95);
    transform: scale(1.08);
    border-color: rgba(255, 255, 255, 0.5);
}

.sc-info {
    padding: 0 2px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sc-title {
    font-size: 0.95em;
    font-weight: 600;
    color: var(--text);
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sc-artist {
    font-size: 0.82em;
    color: var(--text);
    opacity: 0.7;
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 2px;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 20px;
    color: var(--text-2);
    font-size: 1em;
}

/* ============ 响应式: 移动端 ============ */
@media (max-width: 900px) {
    .tag-panel-grid {
        column-count: 1;
    }
}

@media (max-width: 768px) {
    .tag-panel > summary {
        padding: 14px 16px;
    }
    .tag-panel-grid {
        padding: 8px 16px 0;
    }
    .tag-load-more {
        width: calc(100% - 32px);
        margin: 8px 16px 16px;
    }
    .songs-grid-full {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 16px;
    }
}

@media (min-width: 1600px) {
    .songs-grid-full {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
}