:root {
    --bg-color: #1e1e1e;
    --bg-light: #2a2a2a;
    --bg-lighter: #3c3c3c;
    --text-color: #d4d4d4;
    --primary-color: #00aaff;
    --primary-dark: #007acc;
    --secondary-color: #4f4f4f;
    --border-color: #555;
    --playhead-color: #ff4d4d;
    --error-color: #ff6b6b;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --ruler-height: 100px;
    --image-track-color: #2b3a4a;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    font-size: 14px;
    user-select: none; /* Prevent text selection during drag operations */
}

#editor-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* Toolbar */
#toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-light);
    padding: 8px 16px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.toolbar-group {
    display: flex;
    gap: 8px;
}

#toolbar button {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    padding: 8px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s, border-color 0.2s;
}

#toolbar button:hover {
    background-color: var(--bg-lighter);
    border-color: var(--primary-color);
}

#toolbar button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: transparent;
    border-color: var(--border-color);
}


#toolbar button svg {
    width: 20px;
    height: 20px;
}

.time-display {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.2em;
    font-weight: bold;
    color: var(--primary-color);
}

/* Editor Body Layout */
#editor-body {
    display: flex;
    flex-grow: 1;
    overflow: hidden;
}

#track-controls {
    width: 150px;
    flex-shrink: 0;
    background-color: var(--bg-light);
    border-right: 1px solid var(--border-color);
    z-index: 11;
    display: flex;
    flex-direction: column;
}

#ruler-spacer {
    height: var(--ruler-height);
    flex-shrink: 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

#project-cover-container {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    position: relative;
}

#playback-image {
    object-fit: contain;
    background-color: #000;
}

#cover-image, #playback-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: pointer;
}

#add-cover-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-color);
    padding: 0;
}
#add-cover-btn:hover {
    color: var(--primary-color);
}
#add-cover-btn svg {
    width: 48px;
    height: 48px;
}

#track-headers-container {
    flex-grow: 1;
    overflow: hidden;
}

.track-header {
    width: 100%;
    height: 100px; /* Match track height */
    padding: 8px;
    border-bottom: 1px solid var(--bg-lighter);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: bold;
    overflow: hidden;
}

.track-header.image-track-header {
    background-color: var(--image-track-color);
    border-bottom: 1px solid var(--primary-dark);
}

.track-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex-grow: 1;
}

.delete-track-btn {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 2px;
    border-radius: 4px;
    flex-shrink: 0;
    margin-left: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
    transition: opacity 0.2s, background-color 0.2s, color 0.2s;
}

.track-header:hover .delete-track-btn {
    opacity: 1;
}

.delete-track-btn:hover {
    background-color: var(--error-color);
    color: white;
}

.delete-track-btn svg {
    width: 20px;
    height: 20px;
}

#add-track-row-control {
    padding: 8px;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

#add-track-plus-btn {
    background: transparent;
    border: 1px dashed var(--secondary-color);
    color: var(--secondary-color);
    width: 100%;
    height: 40px;
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

#add-track-plus-btn:hover {
    background: rgba(0, 170, 255, 0.1);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

#add-track-plus-btn svg {
    width: 20px;
    height: 20px;
}


/* Timeline & Tracks */
#timeline-container {
    flex-grow: 1;
    position: relative;
    overflow: auto;
    background-color: var(--bg-color);
    cursor: text;
}

#timeline-ruler {
    position: sticky;
    top: 0;
    height: var(--ruler-height);
    background-color: var(--bg-light);
    z-index: 10;
    background-image:
        linear-gradient(to right, var(--border-color) 1px, transparent 1px),
        linear-gradient(to right, var(--secondary-color) 1px, transparent 1px);
    background-size: 100px 100%, 10px 100%;
    border-bottom: 1px solid var(--border-color);
}

#ruler-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

#playhead {
    position: absolute;
    top: 0;
    left: 0;
    width: 10px; /* Wider for easier grabbing */
    height: 100%;
    background-color: transparent;
    z-index: 5;
    cursor: ew-resize; /* Sliding symbol */
    pointer-events: auto; /* Make it interactive */
    transform: translateX(-50%); /* Center the handle on the exact pixel */
}

#playhead::before {
    content: '';
    position: absolute;
    left: 4px; /* (10px - 2px) / 2 */
    top: 0;
    width: 2px;
    height: 100%;
    background-color: var(--playhead-color);
    pointer-events: none; /* The pseudo-element shouldn't capture events */
}

#tracks-container {
    position: relative;
    min-height: calc(100% - var(--ruler-height));
}

.track {
    height: 100px;
    border-bottom: 1px solid var(--bg-lighter);
}

.track.image-track-row {
    background-color: var(--image-track-color);
    border-bottom: 1px solid var(--primary-dark);
}

.track-timeline {
    height: 100%;
    position: relative;
    background-image: linear-gradient(var(--bg-lighter) 1px, transparent 1px);
    background-size: 100% 50px;
}

.image-track-row .track-timeline {
    background-image: none;
}


/* Audio Clip */
.clip {
    position: absolute;
    height: 80%;
    top: 10%;
    background-color: var(--primary-dark);
    border-radius: 4px;
    border: 1px solid var(--primary-color);
    cursor: grab;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible; /* Needed for handles to be visible outside */
}

.clip.selected {
    border: 2px solid var(--playhead-color);
    box-shadow: 0 0 10px rgba(255, 77, 77, 0.7);
    z-index: 3;
}

.clip:active {
    cursor: grabbing;
}

.clip-waveform {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 4px;
    overflow: hidden;
}

/* Image Clip */
.image-clip {
    position: absolute;
    height: 80%;
    top: 10%;
    background-color: #000;
    border-radius: 4px;
    border: 1px solid var(--text-color);
    cursor: grab;
    overflow: hidden;
    /* Updated styles for better image display */
    background-size: contain;      /* Fit image vertically, maintain aspect ratio */
    background-position: center;   /* Center the image */
    background-repeat: repeat-x; /* Repeat horizontally if clip is wider */
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.8);
    font-size: 10px;
    text-shadow: 1px 1px 2px black;
    overflow: visible;
}

.image-clip.selected {
    border: 2px solid var(--playhead-color);
    box-shadow: 0 0 10px rgba(255, 77, 77, 0.7);
    z-index: 3;
}

.image-clip:active {
    cursor: grabbing;
}


/* Handles (reused for audio and image clips) */
.clip-handle {
    position: absolute;
    top: 0;
    height: 100%;
    width: 10px;
    background-color: rgba(0, 170, 255, 0.5);
    z-index: 4;
}

.clip-handle.left {
    left: 0;
    cursor: w-resize;
}

.clip-handle.right {
    right: 0;
    cursor: e-resize;
}

/* In-Clip Controls */
.clip-delete-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 18px;
    height: 18px;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--text-color);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    line-height: 18px;
    z-index: 6;
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.2s, transform 0.2s, background-color 0.2s;
}
.clip:hover .clip-delete-btn, .clip.selected .clip-delete-btn,
.image-clip:hover .clip-delete-btn, .image-clip.selected .clip-delete-btn {
    opacity: 1;
    transform: scale(1);
}
.clip-delete-btn:hover {
    background-color: var(--error-color);
    border-color: var(--error-color);
}
.clip-delete-btn::after {
    content: '×';
}

.clip-fade-handle {
    position: absolute;
    bottom: 0;
    width: 12px;
    height: 12px;
    background-color: var(--playhead-color);
    border: 1px solid var(--bg-color);
    border-radius: 50%;
    z-index: 5;
    opacity: 0;
    transform: translateY(50%);
    transition: opacity 0.2s;
}
.clip:hover .clip-fade-handle, .clip.selected .clip-fade-handle {
    opacity: 1;
}
.clip-fade-handle.left {
    left: 0;
    cursor: e-resize;
}
.clip-fade-handle.right {
    right: 0;
    cursor: w-resize;
}

.clip-volume-line {
    position: absolute;
    left: 15px;
    right: 15px;
    height: 2px;
    background-color: var(--primary-color);
    pointer-events: auto; /* Make line draggable */
    cursor: ns-resize; /* Show vertical resize cursor on line */
    z-index: 3;
    opacity: 0;
    transition: opacity 0.2s;
}
.clip:hover .clip-volume-line, .clip.selected .clip-volume-line {
    opacity: 0.8;
}
.clip-volume-handle {
    position: absolute;
    left: 50%;
    width: 12px;
    height: 12px;
    background-color: white;
    border: 1px solid var(--bg-color);
    border-radius: 50%;
    cursor: ns-resize;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translate(-50%, -50%);
}
.volume-tooltip {
    position: absolute;
    bottom: 120%;
    background-color: var(--bg-lighter);
    color: var(--text-color);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 10px;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
}
.clip-volume-handle:hover .volume-tooltip,
.clip-volume-handle.dragging .volume-tooltip {
    opacity: 1;
}


/* Utility Classes */
.hidden {
    display: none !important;
}

/* Drop Zone */
.drop-container {
    height: 100%;
}
.drop-container .drop-indicator {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    color: var(--secondary-color);
    border: 2px dashed var(--secondary-color);
    border-radius: 8px;
    margin: 16px;
    pointer-events: none;
}

#tracks-container.dragover .drop-indicator {
   display: none;
}
#tracks-container.dragover {
    background-color: rgba(0, 170, 255, 0.1);
    border: 2px dashed var(--primary-color);
}


/* Loading Overlay */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.spinner {
    border: 8px solid var(--bg-lighter);
    border-top: 8px solid var(--primary-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
}

#loading-text {
    margin-top: 20px;
    font-size: 1.2em;
    color: var(--text-color);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Modal Base */
.modal-content {
    background-color: var(--bg-light);
    padding: 24px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 5px 15px rgba(0,0,0,0.5);
    width: 90%;
}

.modal-actions {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 24px;
}
.modal-actions button {
    background-color: var(--bg-lighter);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 14px;
    transition: background-color 0.2s, border-color 0.2s;
}
.modal-actions button:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-color);
}

/* Export Modal */
#export-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}
#export-modal .modal-content {
    max-width: 500px;
    text-align: center;
}
#export-modal h3 {
    margin-top: 0;
    margin-bottom: 8px;
    color: var(--text-color);
}
#export-modal p {
    margin-bottom: 24px;
    color: var(--secondary-color);
}
#export-modal .modal-actions {
    flex-wrap: wrap;
}

#export-modal button#export-cancel-btn:hover {
    background-color: var(--bg-lighter);
    border-color: var(--secondary-color);
}

/* AI Cover Modal */
#ai-cover-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
}
#ai-cover-modal .modal-content {
    max-width: 500px;
    text-align: left;
}
#ai-cover-modal h3 {
    margin-top: 0;
    margin-bottom: 8px;
    color: var(--text-color);
}
#ai-cover-modal p {
    font-size: 14px;
    margin-bottom: 16px;
    color: var(--secondary-color);
}
#ai-cover-prompt-container {
    margin-bottom: 16px;
}
#ai-cover-prompt-container label {
    display: block;
    margin-bottom: 4px;
    font-weight: bold;
}
#ai-cover-prompt {
    width: 100%;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px;
    border-radius: 4px;
    font-family: inherit;
    resize: vertical;
    margin-bottom: 8px;
}
#ai-suggest-prompt-btn {
    background-color: var(--bg-lighter);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.2s, border-color 0.2s;
    font-size: 12px;
}
#ai-suggest-prompt-btn:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-color);
}
#ai-suggest-prompt-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
#ai-cover-result-container {
    width: 100%;
    aspect-ratio: 1 / 1;
    background-color: var(--bg-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
}
#ai-cover-result-container .spinner {
    position: absolute;
    width: 40px;
    height: 40px;
    border-width: 4px;
}
#ai-generated-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
}
#ai-cover-modal .modal-actions button {
    flex-grow: 1;
}
#ai-use-image-btn:disabled,
.modal-actions button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-lighter);
    border-color: var(--border-color);
}
#ai-use-image-btn:disabled:hover,
.modal-actions button:disabled:hover {
    background-color: var(--bg-lighter);
    border-color: var(--border-color);
}