/* ========== RESET & VARIABLES ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Light mode */
    --bg-primary: #f9fafb;
    --bg-secondary: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --accent: #3b82f6;        /* blue-500 */
    --accent-hover: #2563eb;
    --border: #e5e7eb;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    --hover-bg: #f3f4f6;
    --player-bg: rgba(255,255,255,0.8);
    --backdrop-blur: blur(10px);
}

[data-theme="dark"] {
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --border: #374151;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    --hover-bg: #374151;
    --player-bg: rgba(31, 41, 55, 0.8);
}

body {
    font-family: 'Inter', 'Poppins', 'Roboto', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background 0.3s ease, color 0.2s ease;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.app-container {
    max-width: 1300px;
    width: 100%;
    background: var(--bg-secondary);
    border-radius: 2rem;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    backdrop-filter: var(--backdrop-blur);
    transition: background 0.3s;
}

/* ========== HEADER ========== */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
}

header h1 {
    font-weight: 600;
    font-size: 1.8rem;
    letter-spacing: -0.02em;
}

.header-controls {
    display: flex;
    gap: 0.75rem;
}

.primary-btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 2rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
}

.primary-btn:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 12px rgba(59,130,246,0.4);
    transform: scale(1.02);
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: var(--hover-bg);
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0,0,0,0.05);
}

.icon-btn:disabled {
    opacity: 0.4;
    pointer-events: none;
}

/* ========== MAIN CONTENT ========== */
.main-content {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.5rem;
    padding: 2rem;
    min-height: 400px;
}

/* Track list section */
.track-list-section {
    background: var(--bg-primary);
    border-radius: 1.5rem;
    padding: 1.2rem;
    border: 1px solid var(--border);
}

.search-bar {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 2rem;
    padding: 0.5rem 1rem;
    margin-bottom: 1.2rem;
}

.search-bar i {
    color: var(--text-secondary);
    margin-right: 0.5rem;
}

.search-bar input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    width: 100%;
    font-size: 0.95rem;
}

.search-bar input::placeholder {
    color: var(--text-secondary);
}

#track-list-container {
    max-height: 400px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent) var(--border);
}

#track-list-container::-webkit-scrollbar {
    width: 6px;
}
#track-list-container::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 3px;
}

.track-item {
    display: flex;
    align-items: center;
    padding: 0.7rem 1rem;
    border-radius: 1rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    margin-bottom: 4px;
    border: 1px solid transparent;
}

.track-item:hover {
    background: var(--hover-bg);
    border-color: var(--border);
    transform: translateX(4px);
}

.track-item.active {
    background: var(--accent);
    color: white;
}

.track-item .track-icon {
    width: 32px;
    height: 32px;
    background: var(--accent);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 1rem;
    color: white;
    font-size: 1rem;
}

.track-item .track-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.placeholder-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    padding: 3rem 1rem;
    text-align: center;
}

.placeholder-message i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.6;
}

/* Now playing section */
.now-playing-section {
    background: var(--bg-primary);
    border-radius: 1.5rem;
    padding: 1.5rem;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.thumbnail-container {
    width: 200px;
    height: 200px;
    margin-bottom: 1.5rem;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: var(--shadow);
    position: relative;
}

.thumbnail {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--accent), #1e3a8a);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: rgba(255,255,255,0.9);
    position: relative;
}

#visualizer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.4;
    pointer-events: none;
}

.track-info h3 {
    font-weight: 600;
    margin-bottom: 0.3rem;
    word-break: break-word;
}

.track-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ========== PLAYER CONTROLS (FOOTER) ========== */
.player-controls {
    background: var(--player-bg);
    backdrop-filter: var(--backdrop-blur);
    border-top: 1px solid var(--border);
    padding: 1.2rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
}

.progress-fill {
    width: 0%;
    height: 100%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.1s linear;
}

.control-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

.control-icon {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.4rem;
    cursor: pointer;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.control-icon:hover {
    background: var(--hover-bg);
    transform: scale(1.1);
}

.control-icon.play-pause {
    background: var(--accent);
    color: white;
    font-size: 1.8rem;
}

.control-icon.play-pause:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 20px var(--accent);
}

.volume-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

#volume-slider {
    width: 120px;
    height: 5px;
    -webkit-appearance: none;
    background: var(--border);
    border-radius: 5px;
    outline: none;
}

#volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: 0.1s;
}

#volume-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 800px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    .now-playing-section {
        order: -1;
    }
    header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
        text-align: center;
    }
    .header-controls {
        justify-content: center;
    }
}

@media (max-width: 500px) {
    .control-buttons {
        gap: 0.5rem;
    }
    .volume-container {
        flex-direction: column;
    }
    .app-container {
        border-radius: 1rem;
    }
}
/* ---------- Fix thumbnail overlay ---------- */
.thumbnail i {
    position: relative;
    z-index: 2;              /* place icon above canvas */
    font-size: 5rem;         /* slightly larger for visibility */
}

#visualizer {
    z-index: 1;              /* keep canvas behind the icon */
    opacity: 0.3;            /* make bars more subtle */
}

/* ---------- Album‑style thumbnails for the track list ---------- */
.track-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 1rem;
}

.track-thumb {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: var(--accent);  /* fallback, will be overwritten by JS */
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.4rem;
    color: white;
    text-transform: uppercase;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    flex-shrink: 0;
    transition: transform 0.2s;
}

.track-item:hover .track-thumb {
    transform: scale(1.05);
}

.track-info {
    flex: 1;
    min-width: 0;            /* allows text truncation */
}

.track-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
}

/* Remove old .track-icon styles if they exist – we no longer use them */
.track-icon {
    display: none;
}
/* Thumbnail image (for now‑playing) */
.thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;           /* above the canvas, below the icon? we'll hide icon when image present */
    border-radius: inherit;
}

.thumbnail i {
    z-index: 3;           /* icon above image (but we'll hide it when image exists) */
}

.thumbnail.has-image i {
    display: none;        /* hide icon when we have an actual image */
}

/* Track list image thumbnails */
.track-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: inherit;
}

.track-thumb {
    overflow: hidden;      /* ensure image fits inside rounded square */
    position: relative;
}