/**
 * 生存战争网 - BGM 背景音乐播放器
 * 侧边浮动音乐图标 + 展开式播放列表面板
 * 支持 4 种主题：light / dark / wk-light / wk-dark
 */

/* ====================================================================
 *  默认变量（亮色主题）
 * ==================================================================== */
:root {
    --bgm-primary: #7c8cf0;
    --bgm-secondary: #9b6fc7;
    --bgm-shadow: rgba(124, 140, 240, 0.4);
    --bgm-shadow-hover: rgba(102, 126, 234, 0.6);
    --bgm-panel-bg: #fff;
    --bgm-panel-border: #e9ecef;
    --bgm-text: #333;
    --bgm-text-secondary: #888;
    --bgm-light-bg: #f8f9fa;
    --bgm-accent-bg: rgba(102, 126, 234, 0.06);
    --bgm-accent-bg-active: rgba(102, 126, 234, 0.1);
    --bgm-divider: #e9ecef;
}

/* ====================================================================
 *  暗色主题
 * ==================================================================== */
body.dark {
    --bgm-primary: #8a9af2;
    --bgm-secondary: #a87dd4;
    --bgm-shadow: rgba(138, 154, 242, 0.3);
    --bgm-shadow-hover: rgba(102, 126, 234, 0.5);
    --bgm-panel-bg: #2d3748;
    --bgm-panel-border: #4a5568;
    --bgm-text: #e2e8f0;
    --bgm-text-secondary: #a0aec0;
    --bgm-light-bg: rgba(45, 55, 72, 0.6);
    --bgm-accent-bg: rgba(102, 126, 234, 0.12);
    --bgm-accent-bg-active: rgba(102, 126, 234, 0.2);
    --bgm-divider: #4a5568;
}

/* ====================================================================
 *  工坊亮色主题
 * ==================================================================== */
body.wk-light {
    --bgm-primary: #6dc46d;
    --bgm-secondary: #55aa55;
    --bgm-shadow: rgba(109, 196, 109, 0.3);
    --bgm-shadow-hover: rgba(85, 170, 85, 0.5);
    --bgm-panel-bg: var(--wk-paper-elv);
    --bgm-panel-border: var(--wk-border);
    --bgm-text: var(--wk-text);
    --bgm-text-secondary: var(--wk-text-2);
    --bgm-light-bg: var(--wk-paper-soft);
    --bgm-accent-bg: rgba(85, 170, 85, 0.1);
    --bgm-accent-bg-active: rgba(85, 170, 85, 0.18);
    --bgm-divider: var(--wk-divider);
}

/* ====================================================================
 *  工坊暗色主题
 * ==================================================================== */
body.wk-dark {
    --bgm-primary: #7ecf78;
    --bgm-secondary: #69bb63;
    --bgm-shadow: rgba(126, 207, 120, 0.3);
    --bgm-shadow-hover: rgba(105, 187, 99, 0.5);
    --bgm-panel-bg: var(--wk-dark-bg-elv);
    --bgm-panel-border: var(--wk-border-dark);
    --bgm-text: var(--wk-text-light);
    --bgm-text-secondary: var(--wk-text-light-2);
    --bgm-light-bg: var(--wk-dark-bg-soft);
    --bgm-accent-bg: rgba(105, 187, 99, 0.12);
    --bgm-accent-bg-active: rgba(105, 187, 99, 0.22);
    --bgm-divider: var(--wk-divider-dark);
}

/* ====================================================================
 *  浮动音乐图标
 * ==================================================================== */
.bgm-fab {
    position: fixed;
    right: 20px;
    bottom: 80px;
    z-index: 9000;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--bgm-primary), var(--bgm-secondary));
    color: #fff;
    font-size: 22px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px var(--bgm-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
}

.bgm-fab:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 24px var(--bgm-shadow-hover);
}

.bgm-fab.playing {
    animation: bgmPulse 2s infinite;
}

@keyframes bgmPulse {
    0%, 100% { box-shadow: 0 4px 16px var(--bgm-shadow); }
    50%      { box-shadow: 0 6px 24px var(--bgm-shadow-hover); }
}

.bgm-fab .bgm-icon {
    display: inline-block;
    transition: transform 0.3s ease;
}

.bgm-fab.open .bgm-icon {
    transform: rotate(135deg);
}

/* ====================================================================
 *  播放列表面板
 * ==================================================================== */
.bgm-panel {
    position: fixed;
    right: 20px;
    bottom: 140px;
    z-index: 8999;
    width: 300px;
    max-height: 420px;
    background: var(--bgm-panel-bg);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.18);
    border: 1px solid var(--bgm-panel-border);
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.bgm-panel.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* 面板头部 */
.bgm-panel-header {
    padding: 14px 16px 10px;
    border-bottom: 1px solid var(--bgm-divider);
    flex-shrink: 0;
}

.bgm-panel-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--bgm-text);
    margin: 0 0 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* ====================================================================
 *  当前播放信息（含封面）
 * ==================================================================== */
.bgm-now-playing {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bgm-light-bg);
    border-bottom: 1px solid var(--bgm-divider);
    flex-shrink: 0;
}

.bgm-cover {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    flex-shrink: 0;
    overflow: hidden;
    background: var(--bgm-divider);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
    transition: border-radius 0.3s ease, box-shadow 0.3s ease;
}

.bgm-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.bgm-cover.spinning {
    animation: bgmSpin 4s linear infinite;
    border-radius: 50%;
    box-shadow: 0 2px 12px var(--bgm-shadow);
}

@keyframes bgmSpin {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

.bgm-now-playing-info {
    flex: 1;
    min-width: 0;
}

.bgm-track-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--bgm-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
}

.bgm-track-album {
    font-size: 11px;
    color: var(--bgm-text-secondary);
    margin: 2px 0 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ====================================================================
 *  进度条
 * ==================================================================== */
.bgm-progress-wrap {
    padding: 8px 16px 8px;
    flex-shrink: 0;
}

.bgm-progress-bar {
    width: 100%;
    height: 4px;
    background: var(--bgm-divider);
    border-radius: 2px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

/* 扩大可点击/可拖拽区域 */
.bgm-progress-bar::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
    right: 0;
    bottom: -8px;
    z-index: 1;
}

.bgm-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--bgm-primary), var(--bgm-secondary));
    border-radius: 2px;
    width: 0%;
    transition: width 0.1s linear;
}

.bgm-progress-bar:hover .bgm-progress-fill {
    height: 6px;
    margin-top: -1px;
}

.bgm-time {
    display: flex;
    justify-content: space-between;
    font-size: 10px;
    color: var(--bgm-text-secondary);
    margin-top: 3px;
}

/* ====================================================================
 *  播放控制按钮
 * ==================================================================== */
.bgm-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 8px 16px 10px;
    flex-shrink: 0;
}

.bgm-ctrl-btn {
    border: none;
    background: transparent;
    color: var(--bgm-text-secondary);
    font-size: 18px;
    cursor: pointer;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.bgm-ctrl-btn:hover {
    background: var(--bgm-accent-bg);
    color: var(--bgm-primary);
}

.bgm-ctrl-btn.bgm-play-btn {
    width: 44px;
    height: 44px;
    font-size: 22px;
    background: linear-gradient(135deg, var(--bgm-primary), var(--bgm-secondary));
    color: #fff;
    box-shadow: 0 2px 8px var(--bgm-shadow);
}

.bgm-ctrl-btn.bgm-play-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 4px 16px var(--bgm-shadow-hover);
    color: #fff;
}

/* ====================================================================
 *  音量控制
 * ==================================================================== */
.bgm-volume-wrap {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0 16px 6px;
    flex-shrink: 0;
}

.bgm-volume-icon {
    font-size: 14px;
    color: var(--bgm-text-secondary);
    cursor: pointer;
    flex-shrink: 0;
}

.bgm-volume-slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--bgm-divider);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

.bgm-volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--bgm-primary), var(--bgm-secondary));
    cursor: pointer;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.bgm-volume-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--bgm-primary), var(--bgm-secondary));
    cursor: pointer;
    border: none;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

/* ====================================================================
 *  播放列表
 * ==================================================================== */
.bgm-playlist {
    flex: 1;
    overflow-y: auto;
    padding: 4px 0;
    min-height: 0;
}

.bgm-playlist::-webkit-scrollbar       { width: 4px; }
.bgm-playlist::-webkit-scrollbar-track { background: transparent; }
.bgm-playlist::-webkit-scrollbar-thumb { background: var(--bgm-divider); border-radius: 2px; }

/* 专辑分组标题 */
.bgm-playlist-group {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px 4px;
    font-size: 11px;
    font-weight: 600;
    color: var(--bgm-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border-top: 1px solid var(--bgm-divider);
    margin-top: 4px;
}

.bgm-playlist-group:first-child {
    border-top: none;
    margin-top: 0;
    padding-top: 6px;
}

.bgm-playlist-group-cover {
    width: 22px;
    height: 22px;
    border-radius: 4px;
    object-fit: cover;
    flex-shrink: 0;
    background: var(--bgm-divider);
}

.bgm-playlist-group-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 空列表提示 */
.bgm-playlist-empty {
    padding: 20px 16px;
    text-align: center;
    font-size: 13px;
    color: var(--bgm-text-secondary);
}

.bgm-playlist-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    cursor: pointer;
    transition: background 0.15s ease;
    font-size: 13px;
    color: var(--bgm-text);
}

.bgm-playlist-cover {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
    background: var(--bgm-divider);
}

.bgm-playlist-item:hover {
    background: var(--bgm-accent-bg);
}

.bgm-playlist-item.active {
    background: var(--bgm-accent-bg-active);
    color: var(--bgm-primary);
    font-weight: 500;
}

.bgm-playlist-item .bgm-item-index {
    font-size: 11px;
    color: var(--bgm-text-secondary);
    width: 18px;
    text-align: center;
    flex-shrink: 0;
}

.bgm-playlist-item.active .bgm-item-index {
    color: var(--bgm-primary);
}

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

/* ====================================================================
 *  工坊像素风格特殊处理
 * ==================================================================== */
body.wk-light .bgm-fab,
body.wk-dark .bgm-fab {
    border-radius: 50% !important;
    font-family: var(--wk-pixel-font);
    box-shadow: 3px 3px 0 rgba(49, 46, 38, 0.3);
}

body.wk-light .bgm-fab:hover,
body.wk-dark .bgm-fab:hover {
    box-shadow: 4px 4px 0 rgba(49, 46, 38, 0.4);
}

body.wk-dark .bgm-fab {
    box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.4);
}

body.wk-dark .bgm-fab:hover {
    box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.5);
}

body.wk-light .bgm-panel,
body.wk-dark .bgm-panel {
    border-radius: 12px;
    border: 2px solid var(--bgm-panel-border);
    box-shadow: var(--wk-hard-shadow);
}

body.wk-dark .bgm-panel {
    box-shadow: var(--wk-hard-shadow-dark);
}

body.wk-light .bgm-ctrl-btn.bgm-play-btn,
body.wk-dark .bgm-ctrl-btn.bgm-play-btn {
    border-radius: 50% !important;
}

body.wk-light .bgm-cover,
body.wk-dark .bgm-cover {
    border-radius: 50% !important;
}

body.wk-light .bgm-playlist-group-cover,
body.wk-dark .bgm-playlist-group-cover {
    border-radius: 4px;
}

body.wk-light .bgm-playlist-cover,
body.wk-dark .bgm-playlist-cover {
    border-radius: 6px;
}

body.wk-light .bgm-volume-slider::-webkit-slider-thumb,
body.wk-dark .bgm-volume-slider::-webkit-slider-thumb {
    border-radius: 50% !important;
}

body.wk-light .bgm-volume-slider::-moz-range-thumb,
body.wk-dark .bgm-volume-slider::-moz-range-thumb {
    border-radius: 50% !important;
}

body.wk-light .bgm-panel-title,
body.wk-dark .bgm-panel-title {
    font-family: var(--wk-pixel-font);
    font-weight: 800;
}

/* ====================================================================
 *  响应式
 * ==================================================================== */
@media (max-width: 480px) {
    .bgm-panel {
        right: 10px;
        bottom: 130px;
        width: 260px;
        max-height: 350px;
    }

    .bgm-fab {
        right: 12px;
        bottom: 70px;
        width: 42px;
        height: 42px;
        font-size: 20px;
    }
}