/* === 全域設定 === */
:root {
    --bg-color: #121212;
    --panel-bg: #1e1e1e;
    --accent: #d4a5a5;
    --text-main: #fff;
    --border: #333;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
    margin: 0; padding: 0;
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    height: 100dvh; width: 100%; overflow: hidden;
}

.app-container { 
    display: flex; flex-direction: column; height: 100%; width: 100%; 
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* === Loading === */
#loader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: #000; z-index: 9999;
    display: flex; justify-content: center; align-items: center;
}
.spinner {
    width: 40px; height: 40px; border: 4px solid #333; border-top: 4px solid var(--accent); 
    border-radius: 50%; animation: spin 1s linear infinite; margin: 0 auto 10px;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

/* === 上半部：播放舞台 (Stage) === */
#stage-area {
    /* [預設狀態]：佔據大部分空間，讓照片盡量大 */
    flex: 1; 
    position: relative;
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    overflow: hidden;
    background: radial-gradient(circle at center, #2a2a2a 0%, #000 100%);
    transition: all 0.4s ease;
    padding-bottom: 20px; /* 留點空間給字幕 */
}

/* 歡迎畫面 */
#welcome-view { display: none; text-align: center; color: #555; }
#welcome-view.active { display: block; }
#welcome-view h1 { font-weight: 300; letter-spacing: 1px; color: var(--accent); margin: 0 0 5px 0; font-size: 1.8rem; }

/* === 音訊模式 === */
.audio-wrapper {
    display: none; flex-direction: column;
    align-items: center; justify-content: center;
    width: 100%; height: 100%;
    gap: 20px;
}

/* 相框：預設放大 */
.photo-frame-simple {
    width: 85vw; /* 幾乎佔滿寬度 */
    max-width: 320px; /* 但不超過 320px */
    aspect-ratio: 1 / 1;
    background: #000;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    overflow: hidden;
    border: 1px solid #333;
    position: relative;
    transition: all 0.4s ease;
}
.photo-frame-simple img { width: 100%; height: 100%; object-fit: cover; }

/* 播放器容器 */
.player-box {
    width: 90%; max-width: 320px;
    background: #000; border-radius: 8px; padding: 5px;
    border: 1px solid #222;
    height: 60px; /* 固定高度，不佔位 */
    overflow: hidden;
}
#audio-embed-container { width: 100%; height: 100%; border-radius: 4px; overflow: hidden; background: #000; }
#audio-embed-container iframe { width: 100%; height: 100%; border: none; display: block; margin-top: -8px; /* 微調 iframe 位置 */ }

/* === 影片元件 === */
.video-wrapper {
    display: none; width: 100%; height: 100%; background: #000;
    justify-content: center; align-items: center;
}
.video-wrapper iframe { width: 100%; height: 100%; }

/* 字幕 */
.stage-caption {
    position: absolute; bottom: 10px; left: 0; width: 100%;
    text-align: center; pointer-events: none; z-index: 20;
    transition: opacity 0.3s;
}
#current-msg { 
    margin: 0 auto; font-size: 0.9rem; color: #fff; 
    background: rgba(0,0,0,0.6); display: inline-block; 
    padding: 6px 15px; border-radius: 20px; max-width: 90%;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    backdrop-filter: blur(2px);
}

/* === 下半部：播放列表 (Playlist) === */
#playlist-area {
    /* [預設狀態]：只露出標題和一點點內容 */
    height: 180px; /* 固定高度，約顯示 2 行 */
    background: var(--panel-bg);
    display: flex; flex-direction: column;
    border-top: 1px solid #333;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.5);
    z-index: 50;
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.playlist-header {
    padding: 15px 20px;
    border-bottom: 1px solid #333;
    display: flex; justify-content: space-between; align-items: center;
    background: rgba(30,30,30,0.98);
    cursor: pointer; /* 讓使用者知道可以點 */
}
.header-left { display: flex; align-items: center; gap: 10px; }
.playlist-header h3 { margin: 0; font-size: 1rem; color: #fff; }
#count-badge { background: #444; padding: 2px 8px; border-radius: 10px; font-size: 0.75rem; color: #ccc; }

#toggle-list-btn {
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    color: var(--accent);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
}

#playlist-content {
    flex: 1; 
    overflow-y: auto; 
    padding: 10px;
    -webkit-overflow-scrolling: touch;
}

.track-item {
    display: flex; align-items: center;
    padding: 10px; margin-bottom: 8px;
    background: rgba(255,255,255,0.03);
    border-radius: 8px;
    cursor: pointer;
}
.track-item.active { background: rgba(212, 165, 165, 0.15); border-color: var(--accent); }
.track-thumb { width: 45px; height: 45px; border-radius: 6px; margin-right: 12px; flex-shrink: 0; }
.track-thumb img { width: 100%; height: 100%; border-radius: 6px; object-fit: cover; }
.track-info { flex: 1; overflow: hidden; }
.track-name { font-weight: bold; font-size: 0.95rem; color: #fff; margin-bottom: 3px; }
.track-msg { font-size: 0.8rem; color: #888; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* === 狀態變化：當列表展開時 (.list-expanded) === */
body.list-expanded #stage-area {
    height: 120px; /* 舞台縮小 */
    flex: none; /* 移除 flex 彈性，強制固定高度 */
    padding: 10px;
    justify-content: flex-start; /* 內容靠上 */
}

/* 展開時：隱藏照片，只留播放器，節省空間 */
body.list-expanded .photo-frame-simple {
    display: none; 
}
body.list-expanded #welcome-view { display: none; }
body.list-expanded .stage-caption { display: none; }

/* 展開時：列表佔滿剩餘空間 */
body.list-expanded #playlist-area {
    flex: 1; /* 吃掉剩餘空間 */
    height: auto; /* 解除固定高度 */
}

/* === PC 版 (維持左右佈局) === */
@media (min-width: 768px) {
    .app-container { flex-direction: row; }
    
    #stage-area { 
        flex: 6; height: 100% !important; /* PC版不受JS影響 */
        border-bottom: none; border-right: 1px solid var(--border); 
        padding: 40px;
        justify-content: center;
    }
    
    .photo-frame-simple { width: 350px; max-width: none; display: block !important; }
    .player-box { max-width: 350px; padding: 10px; height: auto; }
    #audio-embed-container { height: 100px; }
    
    #playlist-area { 
        flex: 4; max-width: 400px; height: 100% !important;
        border-top: none; 
    }
    
    /* PC版隱藏切換按鈕，因為空間夠大 */
    #toggle-list-btn { display: none; }
    .playlist-header { cursor: default; }
}