:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --bg-input: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-red: #ef4444;
    --border-color: #334155;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family:
        "Inter",
        system-ui,
        -apple-system,
        sans-serif;
    height: 100vh;
    overflow: hidden;
}

/* --- CUSTOMIZE PANE (Sidebar) --- */
#customize-pane {
    width: 320px;
    min-width: 320px;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    height: 100vh;
    overflow-y: auto;
    padding: 20px 10px;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-input) transparent;
}

#customize-pane::-webkit-scrollbar {
    width: 6px;
}

#customize-pane::-webkit-scrollbar-thumb {
    background: var(--bg-input);
    border-radius: 10px;
}

/* --- SECTIONS --- */
.section {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: 15px;
    overflow: hidden;
    transition: var(--transition);
}

.section h2 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.section h2::after {
    content: "";
    font-family: "Material Icons Outlined";
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* --- STYLE GROUPS --- */
.style-group-container {
    background: transparent;
    padding: 0;
    margin: 0;
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
}

.style-group-container:last-child {
    border-bottom: none;
}

.style-group-trigger {
    background: #000000aa;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 12px 15px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.style-group-trigger:hover {
    color: var(--text-primary);
    background: #000000aa;
}

.style-group {
    background: #00000022;
    width: 100%;
    padding: 10px 15px 20px 15px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.style-type {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* --- INPUTS & CONTROLS --- */

input[type="text"] {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    padding: 8px 12px;
    font-size: 0.85rem;
    outline: none;
    transition: border var(--transition);
}

input[type="number"] {
    width: 75px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    padding: 8px 12px;
    font-size: 0.85rem;
    outline: none;
    transition: border var(--transition);
}
select {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    padding: 8px 12px;
    font-size: 0.85rem;
    outline: none;
    transition: border var(--transition);
}

input:focus,
select:focus {
    border-color: var(--primary-color);
}

input[type="color"] {
    appearance: none;
    -webkit-appearance: none;
    border: none;
    width: 100%;
    height: 35px;
    cursor: pointer;
    background: none;
}

input[type="color"]::-webkit-color-swatch {
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
}

.input-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

input[type="range"] {
    flex-grow: 1;
    accent-color: var(--primary-color);
    cursor: pointer;
}

/* --- TRACKS SECTION --- */
.track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: 15px;
    margin: 10px;
    border: 1px solid var(--border-color);
}

.track h4 {
    font-size: 0.85rem;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.track label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
    display: block;
}

.delete-track {
    background: var(--accent-red) !important;
    color: white;
    border-radius: 4px;
    padding: 2px 8px;
    font-weight: bold;
    font-size: 0.7rem;
    transition: var(--transition);
}

.delete-track:hover {
    filter: brightness(1.2);
}

/* --- PREVIEW PANE --- */
#preview-pane {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
}

/* The actual exported component wrapper */
.playlist-container {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* --- ACTION BUTTONS --- */
#add-track-button,
#export-button {
    width: 90%;
    padding: 12px;
    border-radius: var(--radius-md);
    border: none;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    margin: 10px auto;
    display: block;
}

#add-track-button {
    background: transparent;
    border: 1px dashed var(--text-secondary);
    color: var(--text-secondary);
}

#add-track-button:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

#export-button {
    background: var(--primary-color);
    color: white;
}

#export-button:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

#export-section {
    padding-bottom: 40px;
}