:root {
    --primary: #9d4edd;
    --secondary: #3c096c;
    --bg-dark: #10002b;
    --text-light: #f8f9fa;
    --glass-bg: rgba(255, 255, 255, 0.07);
    --glass-border: rgba(255, 255, 255, 0.1);
    --b: 1; /* Beat scale variable */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Outfit', sans-serif;
    /* Static gradient background - extremely fast */
    background: linear-gradient(135deg, #10002b 0%, #3c096c 100%);
    background-attachment: fixed;
    color: var(--text-light);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
    padding: 1rem;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1000px;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

header {
    text-align: center;
}

.album-info h1 {
    font-size: clamp(2rem, 8vw, 3.5rem);
    font-weight: 800;
    letter-spacing: clamp(2px, 2vw, 10px);
    margin-bottom: 0.2rem;
    color: #fff;
    text-transform: uppercase;
}

.album-info h2 {
    font-weight: 300;
    letter-spacing: 2px;
    color: #ccc;
    font-size: clamp(0.9rem, 3vw, 1.1rem);
}

main {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

@media (min-width: 900px) {
    main {
        display: grid;
        grid-template-columns: 1.2fr 1fr;
        gap: 2rem;
    }
}

/* Glass Panels - Minimalist version */
.glass-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* Player Panel */
.player-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.cover-container {
    position: relative;
    width: clamp(160px, 50vw, 240px);
    aspect-ratio: 1 / 1;
    margin-bottom: 1.2rem;
    border-radius: 12px;
    /* Composite layer for beat scale */
    transform: scale(var(--b));
    will-change: transform;
}

#track-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: inherit;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

#track-cover.playing {
    border-radius: 50%;
    /* Simplified animation */
    animation: rotate 20s linear infinite;
}

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

.track-info {
    margin-bottom: 1rem;
    width: 100%;
}

.track-info h3 {
    font-size: clamp(1.2rem, 5vw, 1.6rem);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.track-info p {
    color: #aaa;
    font-size: 0.9rem;
}

/* Progress Bar */
.progress-container {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 1.2rem;
}

#current-time, #duration-time {
    font-size: 0.8rem;
    color: #bbb;
    width: 35px;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #fff;
    cursor: pointer;
}

/* Controls */
.controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
}

.control-btn {
    background: none;
    border: none;
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0.8;
}

.play-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Tracklist */
.tracklist-panel {
    max-height: 40vh;
    overflow-y: auto;
}

@media (min-width: 900px) {
    .tracklist-panel { max-height: none; }
}

#track-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.track-item {
    display: flex;
    align-items: center;
    padding: 8px 10px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
    cursor: pointer;
}

.track-item.active {
    background: rgba(157, 78, 221, 0.15);
    border: 1px solid rgba(157, 78, 221, 0.3);
}

.track-item-img {
    width: 36px;
    height: 36px;
    border-radius: 4px;
    margin-right: 10px;
}

.track-item-title {
    font-size: 0.9rem;
    font-weight: 600;
}

.track-item-artist {
    font-size: 0.75rem;
    color: #888;
}

/* Static simple "equalizer" to save CPU */
.playing-icon {
    display: none;
    gap: 2px;
}

.track-item.active .playing-icon { display: flex; }

.bar {
    width: 2px;
    height: 10px;
    background: var(--primary);
    animation: simplePulse 0.8s infinite alternate;
}

@keyframes simplePulse {
    from { height: 4px; }
    to { height: 12px; }
}