:root {
    --font-stack: 'JetBrains Mono', monospace;
    --grid-unit: 8px;
    --primary: #00ffcc;
    --secondary: #008877;
    --bg-dark: #050a0a;
    --bg-panel: rgba(10, 20, 20, 0.85);
    --text-main: #e0ffff;
    --text-dim: #5c7a7a;
    --grid-color: rgba(0, 255, 204, 0.1);
    --glow-spread: 10px;
}

[data-theme="sunset"] {
    --primary: #ff0055;
    --secondary: #f8d210;
    --bg-dark: #0e0408;
    --bg-panel: rgba(25, 5, 15, 0.85);
    --text-main: #fff0f5;
    --text-dim: #9c5c7a;
    --grid-color: rgba(255, 0, 85, 0.15);
}

[data-theme="matrix"] {
    --primary: #00ff00;
    --secondary: #008f00;
    --bg-dark: #000000;
    --bg-panel: rgba(0, 20, 0, 0.9);
    --text-main: #ccffcc;
    --text-dim: #005500;
    --grid-color: rgba(0, 255, 0, 0.1);
    --glow-spread: 5px;
}

[data-theme="rust"] {
    --primary: #ff9900;
    --secondary: #8b4513;
    --bg-dark: #1a1a1a;
    --bg-panel: rgba(40, 35, 30, 0.9);
    --text-main: #eaddcf;
    --text-dim: #887766;
    --grid-color: rgba(255, 153, 0, 0.1);
}

* { box-sizing: border-box; user-select: none; }
body {
    margin: 0; padding: 0;
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-stack);
    height: 100vh;
    overflow: hidden;
    transition: background-color 0.5s;
}

.perspective-grid {
    position: absolute;
    width: 100%; height: 100%;
    perspective: 600px;
    overflow: hidden;
    z-index: -1;
    pointer-events: none;
}

.grid-floor {
    position: absolute;
    width: 200%; height: 200%;
    left: -50%; top: 0;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    transform: rotateX(75deg);
    transform-origin: 50% 0;
    animation: grid-scroll 10s linear infinite;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0) 0%, rgba(0,0,0,1) 40%);
}

@keyframes grid-scroll {
    0% { background-position: 0 0; }
    100% { background-position: 0 40px; }
}

.crt-overlay {
    position: fixed; inset: 0;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), 
                linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    background-size: 100% 2px, 3px 100%;
    pointer-events: none; z-index: 999;
}
.scanline {
    width: 100%; height: 5px;
    background: rgba(255,255,255,0.05);
    position: fixed; left: 0; top: 0;
    animation: scanline 8s linear infinite;
    pointer-events: none; z-index: 998;
}
@keyframes scanline { 0% { top: -5%; } 100% { top: 105%; } }

.app-container {
    display: grid;
    grid-template-rows: 70px 1fr 80px;
    height: 100vh;
    padding: 15px; gap: 15px;
    max-width: 1800px; margin: 0 auto;
    position: relative; z-index: 10;
}

header {
    display: flex; justify-content: space-between; align-items: center;
    background: var(--bg-panel);
    border: 1px solid var(--primary);
    padding: 0 20px;
    box-shadow: 0 0 var(--glow-spread) rgba(0,0,0,0.5);
    backdrop-filter: blur(5px);
}

.brand h1 { color: var(--primary); margin: 0; }
.sys-controls { display: flex; gap: 20px; align-items: center; }
.control-group { display: flex; align-items: center; gap: 10px; font-size: 0.8rem; color: var(--text-dim); }

.theme-switcher { display: flex; gap: 5px; }
.theme-btn {
    width: 15px; height: 15px; border: 1px solid #fff;
    cursor: pointer; transition: transform 0.2s;
}
.theme-btn:hover { transform: scale(1.2); }

.cyber-btn {
    border: 1px solid var(--primary); color: var(--primary);
    padding: 8px 16px; cursor: pointer; background: transparent;
    font-family: var(--font-stack); font-weight: bold;
    transition: 0.2s; text-transform: uppercase;
}
.cyber-btn:hover { background: var(--primary); color: #000; box-shadow: 0 0 15px var(--primary); }

main { 
    display: grid; 
    grid-template-columns: 400px 1fr; 
    gap: 20px; 
    overflow: hidden; 
    min-height: 0;
}

.visualizer-section, .playlist-section {
    background: var(--bg-panel);
    border: 1px solid var(--primary);
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    min-height: 0;
}

.panel-header {
    display: flex; justify-content: space-between;
    background: rgba(0,0,0,0.3);
    padding: 8px 12px;
    border-bottom: 1px solid var(--primary);
    color: var(--primary); font-size: 0.8rem;
    flex-shrink: 0;
}
.text-btn {
    background: none; border: none; color: var(--text-dim);
    cursor: pointer; font-family: inherit;
}
.text-btn:hover { color: var(--text-main); }

canvas { width: 100%; height: 240px; background: rgba(0,0,0,0.5); }

.track-info-display { padding: 20px; }
.track-info-display h2 { 
    margin: 0; font-size: 1.4rem; color: var(--primary); 
    text-shadow: 0 0 5px var(--primary);
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.tag { font-size: 0.7rem; border: 1px solid var(--text-dim); padding: 2px 6px; border-radius: 2px; }

.playlist-grid {
    padding: 15px; 
    overflow-y: auto;
    overflow-x: hidden;
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 15px;
    height: 0;
    flex: 1;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #000; }
::-webkit-scrollbar-thumb { background: var(--primary); }

.track-card {
    border: 1px solid var(--text-dim);
    background: rgba(0,0,0,0.4);
    padding: 10px; cursor: pointer; transition: 0.2s;
}
.track-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.track-card.active { 
    border-color: var(--primary); background: rgba(0, 255, 204, 0.1);
    box-shadow: inset 0 0 15px rgba(0, 255, 204, 0.1);
}
.card-art {
    aspect-ratio: 1; background: #111; display: flex;
    align-items: center; justify-content: center; margin-bottom: 8px;
    border: 1px solid #333; font-size: 2rem; color: #333;
}
.card-art img { width: 100%; height: 100%; object-fit: cover; }

footer {
    background: var(--bg-panel); border-top: 1px solid var(--primary);
    display: flex; align-items: center; padding: 0 20px; gap: 20px;
}
.cyber-icon-btn {
    width: 40px; height: 40px; background: none;
    border: 1px solid var(--primary); color: var(--primary);
    cursor: pointer; transition: 0.2s; font-family: var(--font-stack);
}
.cyber-icon-btn:hover { background: var(--primary); color: #000; }

.progress-container { flex: 1; display: flex; align-items: center; gap: 15px; }
.range-wrapper { flex: 1; position: relative; height: 4px; background: #333; }
input[type=range] {
    position: absolute; width: 100%; height: 100%; opacity: 0; cursor: pointer; z-index: 2;
}
.range-fill {
    height: 100%; background: var(--primary); width: 0%;
    box-shadow: 0 0 10px var(--primary); transition: width 0.1s linear;
}

.glitch-wrapper {
    position: relative; display: inline-block; font-size: 1.5rem;
    font-weight: 800; color: var(--primary);
}
.glitch-wrapper::before, .glitch-wrapper::after {
    content: attr(data-text); position: absolute; top: 0; left: 0; width: 100%; height: 100%;
}
.glitch-wrapper::before { left: 2px; text-shadow: -1px 0 #ff00c1; clip: rect(44px, 450px, 56px, 0); animation: glitch-anim 5s infinite linear alternate-reverse; }
.glitch-wrapper::after { left: -2px; text-shadow: -1px 0 #00fff9; clip: rect(44px, 450px, 56px, 0); animation: glitch-anim2 5s infinite linear alternate-reverse; }

@keyframes glitch-anim {
    0% { clip: rect(10px, 9999px, 30px, 0); }
    20% { clip: rect(80px, 9999px, 100px, 0); }
    100% { clip: rect(0, 9999px, 5px, 0); }
}
@keyframes glitch-anim2 {
    0% { clip: rect(60px, 9999px, 80px, 0); }
    20% { clip: rect(10px, 9999px, 20px, 0); }
    100% { clip: rect(30, 9999px, 40px, 0); }
}

@media(max-width: 800px) {
    main { 
        grid-template-columns: 1fr; 
        grid-template-rows: auto 1fr; 
        min-height: 0;
    }
    .sys-controls { flex-direction: column; align-items: flex-end; gap: 10px; }
}