:root {
    --bg-color: #1a1a1a;
    --panel-bg: #2a2a2a;
    --border-color: #444;
    --text-color: #e0e0e0;
    --text-color-dark: #999;
    --primary-color: #4a90e2;
    --primary-color-hover: #5aa1f2;
    --danger-color: #e94f37;
    --warning-color: #f7a440;
    --font-family: 'Noto Sans KR', sans-serif;
}

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

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    height: 50px;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

header h1 {
    font-size: 1.2rem;
    color: var(--primary-color);
}
header h1 .fa-solid {
    margin-right: 8px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.export-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.export-controls select {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 7px;
    border-radius: 5px;
    font-size: 0.9rem;
}


header .export-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}
header .export-btn:hover {
    background-color: var(--primary-color-hover);
}
header .export-btn .fa-solid {
    margin-right: 8px;
}
header .btn-secondary {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color-dark);
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}
header .btn-secondary:hover {
    color: var(--text-color);
    border-color: var(--text-color-dark);
}
header .btn-secondary .fa-solid {
    margin-right: 8px;
}


main {
    display: grid;
    grid-template-columns: 280px 5px 1fr 5px 280px;
    flex-grow: 1;
    overflow: hidden;
}

.panel {
    background-color: var(--panel-bg);
    padding: 15px;
    overflow-y: auto;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

.panel:first-child {
    border-left: none;
}

.panel h2, .panel h3 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 15px;
    font-size: 1rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    flex-shrink: 0;
}
.panel h2 .fa-solid, .panel h3 .fa-solid {
    margin-right: 8px;
    color: var(--primary-color);
}


.panel-section {
    margin-bottom: 20px;
}

.upload-btn, .tool-btn {
    display: block;
    width: 100%;
    background-color: #3e3e3e;
    color: var(--text-color);
    border: 1px dashed var(--border-color);
    padding: 12px;
    border-radius: 5px;
    cursor: pointer;
    text-align: center;
    font-size: 0.9rem;
    margin-bottom: 15px;
    transition: background-color 0.2s, border-color 0.2s;
}

.upload-btn:hover, .tool-btn:hover {
    background-color: #4a4a4a;
    border-color: var(--primary-color);
}

.tool-btn {
    text-align: left;
    display: flex;
    align-items: center;
}
.tool-btn .fa-solid {
    margin-right: 10px;
    width: 16px;
    text-align: center;
}
.tool-btn .fa-caret-down {
    margin-left: auto;
}

.tool-dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #3e3e3e;
    min-width: 100%;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 100;
    border-radius: 5px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.dropdown-content.show {
    display: block;
}

.dropdown-content a {
    color: var(--text-color);
    padding: 12px 16px;
    text-decoration: none;
    display: flex;
    align-items: center;
    font-size: 0.9rem;
}
.dropdown-content a:hover {
    background-color: var(--primary-color);
}
.dropdown-content a .fa-solid {
    margin-right: 10px;
    width: 16px;
    text-align: center;
}


.media-bin {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 10px;
}

.media-item {
    position: relative;
    cursor: grab;
    border-radius: 5px;
    overflow: hidden;
    border: 2px solid transparent;
    aspect-ratio: 16 / 9;
    background-color: var(--bg-color);
}
.media-item:hover {
    border-color: var(--primary-color);
}
.media-item video,
.media-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.media-item .media-name {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0,0,0,0.7);
    color: white;
    font-size: 0.7rem;
    padding: 4px;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.canvas-panel {
    background-color: var(--bg-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    justify-content: center;
    align-items: center;
}

.canvas-container {
    width: 100%;
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

#canvas {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: black;
    position: relative;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
    background-size: cover;
    background-position: center;
    transition: aspect-ratio 0.3s ease;
    cursor: default;
}

.playback-controls {
    display: flex;
    align-items: center;
    gap: 15px;
    width: 100%;
    max-width: 800px;
    padding: 15px 0 0 0;
    color: var(--text-color-dark);
}
.playback-controls button {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    width: 30px;
    height: 30px;
}

.playback-controls button#editor-view-btn.active {
    color: var(--primary-color);
}


.time-slider-container {
    flex-grow: 1;
}
#time-slider {
    width: 100%;
}

.properties-inspector {
    flex-grow: 1;
}

.properties-inspector .property-group {
    margin-bottom: 20px;
}
.properties-inspector h4, .properties-inspector h5 {
    font-size: 1rem;
    margin-bottom: 15px;
    color: var(--primary-color);
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}
.properties-inspector .property-group h5 {
    font-size: 0.9rem;
    color: var(--text-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    color: var(--text-color-dark);
    border-bottom: none;
    padding-bottom: 0;
}
.properties-inspector .prop-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}
.properties-inspector label {
    font-size: 0.85rem;
    color: var(--text-color-dark);
}
.properties-inspector input,
.properties-inspector select {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 4px;
    border-radius: 3px;
    max-width: 150px;
}
.properties-inspector input {
     width: 80px;
     text-align: right;
}
.properties-inspector input[type="text"], 
.properties-inspector input[type="color"],
.properties-inspector textarea,
.properties-inspector select {
    width: 100%;
    text-align: left;
}
.properties-inspector input[type="color"] {
    width: 80px;
    height: 25px;
    padding: 2px;
}
.properties-inspector textarea {
    height: 80px;
    resize: vertical;
    width: 100%;
    margin-top: 5px;
}

.properties-inspector .btn-secondary {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 4px 8px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 0.75rem;
    transition: all 0.2s;
}
.properties-inspector .btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-group-action {
    display: block;
    width: 100%;
    padding: 10px;
    margin-top: 15px;
    border: none;
    border-radius: 5px;
    font-size: 0.9rem;
    cursor: pointer;
    background-color: var(--warning-color);
    color: white;
    font-weight: bold;
    transition: opacity 0.2s;
}
.btn-group-action:hover {
    opacity: 0.9;
}

.btn-danger {
    display: block;
    width: 100%;
    padding: 10px;
    margin-top: 20px;
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: opacity 0.2s;
}
.btn-danger:hover {
    opacity: 0.9;
}


.timeline-panel {
    height: 200px;
    flex-shrink: 0;
    background-color: var(--panel-bg);
    border-top: 1px solid var(--border-color);
    padding: 10px;
    overflow-x: auto;
    overflow-y: hidden; /* vertical scroll handled by tracks container */
}
.timeline {
    position: relative;
    min-height: 100%;
}

.timeline-ruler {
    position: relative;
    height: 25px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 5px;
    width: 100%;
    color: var(--text-color-dark);
    font-size: 0.75rem;
}
.ruler-marker {
    position: absolute;
    height: 100%;
    border-left: 1px solid var(--text-color-dark);
    top: 0;
    transform: translateX(-1px);
    display: flex;
    align-items: flex-start;
}
.ruler-marker span {
    padding-left: 4px;
}

.timeline-end-marker {
    position: absolute;
    top: 0;
    bottom: -1000px; /* Hack to ensure it covers all tracks when scrolling */
    width: 3px;
    background-color: var(--danger-color);
    opacity: 0.6;
    z-index: 15;
    pointer-events: none;
    box-shadow: 0 0 8px rgba(233, 79, 55, 0.7);
}

.tracks-container {
    overflow-y: auto;
    height: calc(100% - 30px); /* 100% of panel minus ruler height */
}

.timeline-track {
    background-color: #333;
    height: 50px;
    border-radius: 5px;
    margin-bottom: 10px;
    position: relative;
    padding: 5px;
}
.timeline-clip {
    position: absolute;
    height: 40px;
    top: 5px;
    background-color: var(--primary-color);
    border-radius: 4px;
    cursor: grab;
    overflow: visible; /* Allow handles to be visible */
    display: flex;
    align-items: center;
    padding: 0 10px;
    font-size: 0.8rem;
    color: white;
    border: 1px solid var(--primary-color-hover);
    user-select: none;
    background-size: cover;
    background-position: center;
}
.timeline-clip span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    background-color: rgba(0, 0, 0, 0.4);
    padding: 2px 5px;
    border-radius: 3px;
}
.timeline-clip.video {
    background-color: #3a7ab8; /* Different color to not be confused with selection */
}
.timeline-clip.text {
    background-color: #e94f37;
    border-color: #f06a56;
}
.timeline-clip.image {
    background-color: #6a4de2;
    border-color: #7d60e8;
}
.timeline-clip.shape {
    background-color: #e2a44d;
    border-color: #e8b660;
}
.timeline-clip.selected {
    box-shadow: 0 0 0 2px white;
    z-index: 10;
}

.timeline-resizer-handle {
    position: absolute;
    top: -2px;
    bottom: -2px;
    width: 8px;
    cursor: ew-resize;
    z-index: 11;
}

.timeline-resizer-handle.left {
    left: -4px;
}

.timeline-resizer-handle.right {
    right: -4px;
}


.empty-message {
    color: var(--text-color-dark);
    font-size: 0.9rem;
    text-align: center;
    padding: 20px;
}

#export-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    z-index: 999;
    justify-content: center;
    align-items: center;
}

.export-modal {
    background-color: var(--panel-bg);
    padding: 30px 40px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.export-modal h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}
.export-modal h3 .fa-solid {
    margin-right: 10px;
}
.export-modal p {
    color: var(--text-color-dark);
    margin-bottom: 5px;
}

.resizer-v {
    background-color: var(--bg-color);
    cursor: col-resize;
    width: 5px;
    z-index: 50;
}
.resizer-h {
    background-color: var(--bg-color);
    cursor: row-resize;
    height: 5px;
    flex-shrink: 0;
    z-index: 50;
}
.resizer-v:hover, .resizer-h:hover {
    background-color: var(--primary-color);
}

.ad-placeholder {
    margin-top: 20px;
    padding: 10px;
    background-color: var(--bg-color);
    border: 1px dashed var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 120px;
    color: var(--text-color-dark);
    font-size: 0.8rem;
    border-radius: 5px;
}
.ad-placeholder p {
    text-align: center;
}