:root {
    --bg-color: #0d1117;
    --surface: #161b22;
    --surface-hover: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #2ea043;
    --accent-hover: #3fb950;
    --border: #30363d;
    --player-bg: rgba(22, 27, 34, 0.95);
    --player-height: 80px;
    --sidebar-width: 240px;
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --transition: all 0.2s ease;
}

[data-theme="light"] {
    --bg-color: #f6f8fa;
    --surface: #ffffff;
    --surface-hover: #f3f4f6;
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --border: #d0d7de;
    --accent: #1f883d;
    --player-bg: rgba(255, 255, 255, 0.95);
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; outline: none; }
body { font-family: var(--font-family); background: var(--bg-color); color: var(--text-primary); overflow: hidden; -webkit-font-smoothing: antialiased; }

.hidden { display: none !important; }

#app { display: flex; flex-direction: column; height: 100dvh; overflow: hidden; }

.lucide { width: 1.2rem; height: 1.2rem; stroke-width: 2px; }
button .lucide { margin-right: 0.5rem; }
.icon-btn .lucide { margin-right: 0; }

.top-bar { display: flex; align-items: center; justify-content: space-between; gap: 15px; padding: 0 20px; height: 60px; background: var(--surface); border-bottom: 1px solid var(--border); z-index: 10; flex-shrink: 0; }
.top-bar-left { display: flex; align-items: center; gap: 15px; }
.site-brand { display: flex; align-items: center; gap: 8px; color: var(--accent); font-weight: 800; font-size: 1.2rem; white-space: nowrap; user-select: none; }
.site-brand .lucide { width: 1.5rem; height: 1.5rem; }
.search-wrapper { position: relative; flex: 1; max-width: 400px; }
.search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-secondary); width: 1rem; height: 1rem; }
#search-input { width: 100%; padding: 10px 10px 10px 38px; border-radius: 8px; border: 1px solid var(--border); background: var(--bg-color); color: var(--text-primary); font-size: 0.9rem; transition: var(--transition); }
#search-input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(46, 160, 67, 0.2); }
.top-bar-actions { display: flex; gap: 5px; }

.icon-btn { background: none; border: none; color: var(--text-secondary); cursor: pointer; padding: 8px; border-radius: 6px; transition: var(--transition); display: flex; align-items: center; justify-content: center; }
.btn-primary { background: var(--accent); color: white; border: none; padding: 10px 20px; border-radius: 8px; cursor: pointer; font-weight: 600; font-size: 0.9rem; display: flex; align-items: center; transition: var(--transition); }
.icon-btn-text { background: none; border: none; color: var(--text-secondary); cursor: pointer; padding: 8px; font-size: 0.9rem; display: flex; align-items: center; gap: 5px; transition: var(--transition); }

.main-content { display: flex; flex: 1; overflow: hidden; min-height: 0; position: relative; }

.sidebar-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); backdrop-filter: blur(3px); z-index: 200; opacity: 0; visibility: hidden; transition: var(--transition); }
.sidebar-overlay.show { opacity: 1; visibility: visible; }

.sidebar { 
    width: var(--sidebar-width); background: var(--surface); border-right: 1px solid var(--border); 
    padding: 10px; display: flex; flex-direction: column; transition: all 0.3s ease; 
    overflow: hidden; white-space: nowrap; flex-shrink: 0; z-index: 210;
}
.sidebar.collapsed { width: 0; padding: 0; border-right: none; opacity: 0; }

.nav-btn { text-align: left; padding: 12px 15px; border: none; background: none; color: var(--text-primary); cursor: pointer; border-radius: 8px; font-size: 0.95rem; font-weight: 500; display: flex; align-items: center; width: 100%; margin-bottom: 2px; transition: var(--transition); }
.nav-btn .lucide { color: var(--text-secondary); }
.nav-btn.active { background: rgba(46, 160, 67, 0.15); color: var(--accent); }
.nav-btn.active .lucide { color: var(--accent); }

#content-area { flex: 1; display: flex; flex-direction: column; overflow-y: auto; background: var(--bg-color); scroll-behavior: smooth; }
#browse-header { display: flex; align-items: center; justify-content: space-between; padding: 20px 30px; border-bottom: 1px solid var(--border); position: sticky; top: 0; background: var(--bg-color); z-index: 5; }
#browse-title { font-size: 1.5rem; font-weight: 800; margin: 0 15px; flex: 1; }

.view-container { padding: 20px 30px; }
.track-item { display: flex; align-items: center; padding: 10px; border-radius: 8px; cursor: pointer; transition: var(--transition); position: relative; border-bottom: 1px solid transparent; }
.track-item.playing { background: var(--surface-hover); }

.track-index-eq { width: 40px; text-align: center; color: var(--text-secondary); font-size: 0.85rem; position: relative; }
.track-item.playing .index-num { display: none; }
.track-item.playing .eq { display: flex; }

.track-item-cover { width: 40px; height: 40px; border-radius: 4px; margin: 0 15px; object-fit: cover; }
.track-info { flex: 1; min-width: 0; }
.track-title { font-size: 0.95rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.track-artist { font-size: 0.85rem; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 2px; }

.fav-btn .lucide { color: var(--text-secondary); transition: var(--transition); fill: none; stroke: currentColor; }
.fav-btn .lucide.filled { color: #e91e63; fill: #e91e63; stroke: #e91e63; }
.fav-toggle-btn .lucide { fill: none; stroke: currentColor; transition: var(--transition); }
.fav-toggle-btn .lucide.filled { color: #e91e63; fill: #e91e63; stroke: #e91e63; }

.eq { display: none; gap: 2px; height: 14px; align-items: flex-end; justify-content: center; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.eq span { width: 3px; background: var(--accent); animation: eq 0.6s infinite alternate; border-radius: 1px; }
.eq span:nth-child(1) { animation-delay: -0.4s; }
.eq span:nth-child(2) { animation-delay: -0.2s; height: 10px; }
.eq span:nth-child(3) { animation-delay: 0s; height: 12px; }
@keyframes eq { 0% { height: 3px; } 100% { height: 100%; } }

.grid-view { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 25px; }
.card-item { background: var(--surface); padding: 15px; border-radius: 12px; cursor: pointer; transition: var(--transition); border: 1px solid var(--border); text-align: center; min-width: 0; }
.card-cover { width: 100%; aspect-ratio: 1; border-radius: 8px; object-fit: cover; margin-bottom: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.card-title { font-size: 0.95rem; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--text-primary); }
.card-subtitle { font-size: 0.85rem; color: var(--text-secondary); margin-top: 3px; }

.player-bar { 
    position: relative; width: 100%; height: calc(var(--player-height) + var(--safe-bottom)); 
    background: var(--player-bg); backdrop-filter: blur(10px);
    border-top: 1px solid var(--border); display: flex; flex-direction: column;
    padding: 0 20px var(--safe-bottom); z-index: 300; box-shadow: 0 -5px 15px rgba(0,0,0,0.1); flex-shrink: 0;
}

.top-progress { 
    position: absolute; top: -10px; left: 0; width: 100%; height: 20px; 
    padding: 0; display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 15; 
}
#progress-bar { 
    width: 100%; height: 4px; cursor: pointer; -webkit-appearance: none; 
    background: linear-gradient(to right, var(--accent) var(--value, 0%), var(--border) var(--value, 0%)); 
    margin: 0; transition: height 0.1s; border-radius: 2px;
}
#progress-bar::-webkit-slider-runnable-track { background: transparent; height: 100%; border: none; }
#progress-bar::-webkit-slider-thumb { 
    -webkit-appearance: none; height: 12px; width: 12px; 
    background: #fff; border-radius: 50%; box-shadow: 0 1px 4px rgba(0,0,0,0.4); 
    margin-top: -4px; opacity: 0; transition: opacity 0.2s, transform 0.1s; 
}

.time-display { 
    position: absolute; right: 20px; top: 16px; font-size: 0.75rem; 
    color: var(--text-secondary); font-family: monospace; pointer-events: none; 
    display: flex; gap: 4px; align-items: center;
}

.player-bar-content { display: flex; align-items: center; justify-content: space-between; flex: 1; padding-top: 3px; }

.player-info { display: flex; align-items: center; width: 30%; gap: 12px; min-width: 200px; cursor: pointer; padding: 5px; margin-left: -5px; border-radius: 8px; transition: var(--transition); }
.player-info:hover { background: rgba(255,255,255,0.05); }
.cover-wrapper { width: 50px; height: 50px; flex-shrink: 0; }
.cover-img { width: 100%; height: 100%; border-radius: 6px; object-fit: cover; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
.cover-spin { animation: spin 10s linear infinite; animation-play-state: paused; }
.cover-img.playing { animation-play-state: running; }
@keyframes spin { 100% { transform: rotate(360deg); } }

.track-details { flex: 1; min-width: 0; }
.marquee { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 0.95rem; font-weight: 700; }
#current-artist { font-size: 0.8rem; color: var(--text-secondary); margin-top: 2px; }
.fav-toggle-btn { margin-left: auto; }

.player-controls { display: flex; align-items: center; gap: 18px; justify-content: center; }

.play-btn-main { background-color: var(--text-primary) !important; color: var(--bg-color) !important; width: 45px; height: 45px; border-radius: 50%; padding: 0; display: flex; justify-content: center; align-items: center; scale: 1; transition: var(--transition); cursor: pointer; border: none; }
.play-btn-main svg { width: 1.5rem; height: 1.5rem; stroke: currentColor !important; fill: currentColor !important; margin: 0; }

#repeat-btn { position: relative; }
.repeat-badge { position: absolute; bottom: 2px; right: 2px; font-size: 0.65rem; background: var(--text-primary); color: var(--bg-color); border-radius: 50%; width: 14px; height: 14px; display: flex; align-items: center; justify-content: center; font-weight: 800; pointer-events: none; }

.seq-btn.active { color: var(--accent); }

.player-extra { display: flex; align-items: center; gap: 10px; width: 30%; justify-content: flex-end; min-width: 150px; }
.volume-icon { color: var(--text-secondary); width: 1rem; }
.volume-bar { 
    width: 100px; cursor: pointer; height: 4px; -webkit-appearance: none; 
    background: linear-gradient(to right, var(--accent) var(--vol-value, 100%), var(--border) var(--vol-value, 100%)); 
    border-radius: 2px; 
}
.volume-bar::-webkit-slider-thumb { -webkit-appearance: none; width: 10px; height: 10px; background: var(--text-secondary); border-radius: 50%; transition: var(--transition); }

/* --- 펼침 플레이어 (가사 및 앨범 뷰) --- */
.expanded-player {
    position: fixed; top: 0; left: 0; width: 100%;
    height: calc(100% - calc(var(--player-height) + var(--safe-bottom)));
    z-index: 250; background: var(--bg-color);
    display: flex; flex-direction: column;
    opacity: 0; pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform: translateY(20px);
}
.expanded-player.show { opacity: 1; pointer-events: auto; transform: translateY(0); }

.expanded-bg {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background-size: cover; background-position: center;
    filter: blur(50px) brightness(0.3); z-index: -1; transform: scale(1.2);
}
.expanded-header { display: flex; justify-content: space-between; align-items: center; padding: 20px 30px; }
.expanded-header-title { text-align: center; flex: 1; min-width: 0; padding: 0 20px; }
#expanded-title { font-size: 1.2rem; font-weight: 800; color: #fff; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#expanded-artist { font-size: 0.9rem; color: rgba(255,255,255,0.7); }

.expanded-content {
    flex: 1; display: flex; align-items: stretch; justify-content: center;
    padding: 0 50px 30px 50px; gap: 50px; overflow: hidden; transition: all 0.3s;
}

.expanded-album {
    flex: 1; display: flex; justify-content: flex-end; align-items: center;
    max-width: 450px; transition: all 0.5s ease;
}
#expanded-cover { width: 100%; aspect-ratio: 1; border-radius: 20px; box-shadow: 0 20px 60px rgba(0,0,0,0.6); object-fit: cover; }

.lyrics-container {
    flex: 1; height: 100%; overflow-y: auto; display: flex; flex-direction: column;
    mask-image: linear-gradient(to bottom, transparent, black 10%, black 90%, transparent);
    -webkit-mask-image: linear-gradient(to bottom, transparent, black 10%, black 90%, transparent);
    padding-right: 20px; scroll-behavior: smooth;
}
.lyrics-container::-webkit-scrollbar { width: 0; }

.lyrics-text {
    display: flex; flex-direction: column; gap: 15px;
    padding: 40vh 0; text-align: left; transition: color 0.3s;
}

/* 동기화 가사 하이라이팅 및 호버 디자인 추가 */
.lyric-line {
    color: rgba(255,255,255,0.4); font-size: 1.5rem; line-height: 1.6; font-weight: 600;
    transition: color 0.3s, transform 0.3s, opacity 0.3s; transform-origin: left center;
    cursor: pointer; /* 클릭 가능하다는 표시 */
}
.lyric-line.active { color: var(--accent); font-size: 1.8rem; font-weight: 800; opacity: 1; text-shadow: 0 2px 10px rgba(0,0,0,0.5); }
.lyric-line:hover { color: var(--accent); opacity: 0.8; }

.lyrics-text.no-sync { color: rgba(255,255,255,0.6); font-size: 1.5rem; line-height: 2.2; font-weight: 700; white-space: pre-wrap; display: block; }
.no-lyrics { display: flex; align-items: center; justify-content: center; height: 100%; padding: 0; font-size: 1.2rem; color: rgba(255,255,255,0.5); }

.expanded-content.lyrics-off .expanded-album { margin: 0 auto; justify-content: center; flex: none; width: 100%; }
.expanded-content.lyrics-off .lyrics-container { display: none; }

.toast { position: fixed; bottom: calc(var(--player-height) + var(--safe-bottom) + 20px); left: 50%; transform: translateX(-50%) translateY(20px); background: rgba(0,0,0,0.8); backdrop-filter: blur(5px); color: white; padding: 12px 24px; border-radius: 50px; font-size: 0.9rem; font-weight: 500; opacity: 0; transition: transform 0.3s, opacity 0.3s; pointer-events: none; z-index: 1000; box-shadow: 0 5px 15px rgba(0,0,0,0.3); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.loading, .empty-state, .error { text-align: center; color: var(--text-secondary); padding: 50px; font-size: 0.9rem; }

@media (hover: hover) and (pointer: fine) {
    .icon-btn:hover { background: var(--surface-hover); color: var(--text-primary); }
    .btn-primary:hover { background: var(--accent-hover); }
    .icon-btn-text:hover { color: var(--text-primary); }
    .nav-btn:hover { background: var(--surface-hover); }
    .track-item:hover { background: var(--surface); }
    .card-item:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.2); border-color: var(--accent); }
    .play-btn-main:hover { scale: 1.05; background-color: var(--accent) !important; color: #ffffff !important; }
    .play-btn-main:hover svg { stroke: #ffffff !important; fill: #ffffff !important; }
    .top-progress:hover #progress-bar { height: 6px; }
    .top-progress:hover #progress-bar::-webkit-slider-thumb { opacity: 1; transform: scale(1.2); }
    .volume-bar:hover::-webkit-slider-thumb { background: var(--accent); }
    .expanded-header .icon-btn:hover { background: rgba(255,255,255,0.1); color: #fff; }
}

@media (max-width: 768px) {
    :root { --sidebar-width: 100%; }
    .top-bar { padding: 0 10px; gap: 5px; }
    .top-bar-left { gap: 5px; }
    .site-brand .brand-text { display: none; } /* 모바일에서 검색창 공간 확보를 위해 로고 글자 숨김 */
    
    .search-wrapper { max-width: none; }
    
    .sidebar { position: absolute; top: 0; left: -100%; height: 100%; width: 250px; border-right: 1px solid var(--border); box-shadow: none; z-index: 210; }
    .sidebar.open { left: 0; box-shadow: 2px 0 15px rgba(0,0,0,0.1); }
    
    .view-container { padding: 15px; }
    #browse-header { padding: 15px; }
    #browse-title { font-size: 1.2rem; }
    
    .track-item-cover { margin: 0 10px; width: 35px; height: 35px; }
    
    .grid-view { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
    .card-item { padding: 10px; }
    .card-title { font-size: 0.9rem; }
    .card-cover { margin-bottom: 8px; }

    .player-bar { height: auto; padding: 15px 15px calc(15px + var(--safe-bottom)); }
    .player-bar-content { flex-direction: column; gap: 15px; }
    
    .top-progress { 
        position: relative; top: 0; width: calc(100% - 50px); height: auto; 
        margin-left: 5px; margin-bottom: 5px; padding: 0; flex-direction: column; align-items: stretch;
        cursor: default; z-index: 10;
    }
    #progress-bar { position: relative; top: 0; height: 5px; margin-bottom: 8px; border-radius: 3px; }
    #progress-bar::-webkit-slider-thumb { opacity: 1; height: 14px; width: 14px; margin-top: -4.5px; }
    .time-display { display: flex; position: relative; right: 0; top: 0; justify-content: space-between; width: 100%; pointer-events: auto; }
    .time-separator { display: none; }

    .player-info { width: 100%; min-width: 0; padding: 0; margin: 0; padding-right: 40px; }
    .cover-wrapper { width: 40px; height: 40px; }
    
    .player-controls { width: 100%; justify-content: space-between; gap: 0; padding: 0 20px; }
    .play-btn-main { width: 40px; height: 40px; }
    
    .player-extra { display: flex; position: absolute; right: 10px; top: 5px; width: 40px; justify-content: center; min-width: auto; padding: 0; z-index: 20; }
    .volume-icon, .volume-bar { display: none; }

    .toast { bottom: 150px; }

    .expanded-header { padding: 15px 20px; }
    .expanded-content { position: relative; flex-direction: column; padding: 0 20px 20px 20px; gap: 20px; justify-content: flex-start; }
    .expanded-album { width: 100%; max-width: 300px; justify-content: center; flex: none; margin: 0 auto; transition: filter 0.3s; }
    
    .expanded-content.lyrics-on .expanded-album { filter: blur(15px) brightness(0.4); transform: scale(1.05); }
    .expanded-content.lyrics-on .lyrics-container { position: absolute; top: 0; left: 0; width: 100%; height: 100%; padding: 0 20px; z-index: 10; display: flex; }
    .expanded-content.lyrics-off .expanded-album { filter: none; transform: scale(1); }
    .expanded-content.lyrics-off .lyrics-container { display: none; }

    .lyrics-container { mask-image: linear-gradient(to bottom, transparent, black 15%, black 85%, transparent); -webkit-mask-image: linear-gradient(to bottom, transparent, black 15%, black 85%, transparent); }
    
    .lyrics-text { padding: 40vh 0; text-align: center; }
    .lyric-line { transform-origin: center center; font-size: 1.3rem; }
}

.spin { animation: spin 1s linear infinite; }