:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --input-bg: #334155;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

header {
    margin-bottom: 20px;
}

.header-top {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    position: relative;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: white;
}

.lang-select {
    padding: 5px 10px;
    border-radius: 4px;
    background-color: var(--input-bg);
    color: white;
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    cursor: pointer;
}

header h1 span {
    color: var(--primary-color);
}

header p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 5px;
    text-align: center;
}

main {
    display: flex;
    gap: 20px;
    flex: 1;
    min-height: 0;
    /* Important for scroll */
}

/* Controls Panel (Left) */
.controls-panel {
    width: 350px;
    background-color: var(--bg-panel);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    border: 1px solid var(--border-color);
    overflow-y: auto;
}

h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
    letter-spacing: 0.05em;
}

.upload-btn {
    background-color: var(--input-bg);
    color: white;
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: background 0.2s;
    display: block;
    font-weight: 500;
    border: 1px dashed var(--text-muted);
}

.upload-btn:hover {
    background-color: var(--border-color);
    border-color: var(--primary-color);
}

.input-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.input-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.input-group input,
.input-group select {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: white;
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 0.9rem;
    width: 120px;
}

.input-group input[type="color"] {
    width: 50px;
    padding: 0;
    height: 30px;
    cursor: pointer;
}

.input-group.full {
    flex-direction: column;
    align-items: flex-start;
    gap: 5px;
}

.input-group.full select {
    width: 100%;
}

/* Layer List */
.layer-list {
    flex: 1;
    background-color: var(--bg-dark);
    border-radius: 8px;
    padding: 10px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    min-height: 150px;
}

.layer-item {
    position: relative;
    /* Anchor for absolute children */
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px;
    padding-top: 15px;
    /* Add space for the button */
    margin-bottom: 8px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.layer-header {
    display: flex;
    align-items: center;
    gap: 10px;
}

.layer-info {
    flex: 1;
    overflow: hidden;
}

.layer-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.layer-controls {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
    /* Allow wrapping */
}

.control-group {
    display: flex;
    align-items: center;
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    padding-right: 2px;
}

.control-group .label {
    font-size: 0.7rem;
    color: var(--text-muted);
    padding: 0 4px;
    border-right: 1px solid var(--border-color);
    margin-right: 4px;
}

.layer-controls input,
.layer-controls select {
    background-color: transparent;
    border: none;
    color: white;
    padding: 4px 2px;
    font-size: 0.8rem;
    outline: none;
}

.layer-controls select {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 3px;
}

.layer-controls input[type="number"] {
    width: 40px;
}

.remove-btn {
    /* position: absolute; */
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    color: #ef4444;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: background 0.2s;
    margin-right: 5px;
    /* Spacing from thumb */
}

.remove-btn:hover {
    background-color: rgba(239, 68, 68, 0.1);
}

/* Action Section */
.primary-btn {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 14px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.primary-btn:hover {
    background-color: var(--primary-hover);
}

.primary-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Preview Panel (Right) */
.preview-panel {
    flex: 1;
    background-color: var(--bg-panel);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 10px;
}

.canvas-wrapper {
    flex: 1;
    background-color: #2a2a2a;
    /* Neutral dark for canvas checking */
    background-image: linear-gradient(45deg, #333 25%, transparent 25%), linear-gradient(-45deg, #333 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #333 75%), linear-gradient(-45deg, transparent 75%, #333 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    border-radius: 8px;
    overflow: auto;
    display: flex;
    align-items: flex-start;
    /* Align to top */
    justify-content: center;
    /* Keep horizontal center? or flex-start? User asked for TL=0 */
    /* Let's try flex-start for both to be super clear about 0,0 */
    justify-content: center;
    padding: 20px;
    position: relative;
}

canvas {
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    background-color: white;
    /* Default canvas bg */
}

.preview-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px;
    background-color: var(--bg-dark);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.preview-controls button {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: white;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    min-width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-controls button:hover {
    background-color: var(--border-color);
}

.frame-counter {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-left: 10px;
    font-family: monospace;
    font-size: 0.9rem;
    color: var(--text-muted);
}

#current-frame-input {
    width: 50px;
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: white;
    border-radius: 4px;
    padding: 4px;
    text-align: right;
    outline: none;
}


#progress-bar-container {
    height: 6px;
    background-color: var(--bg-dark);
    border-radius: 3px;
    margin-top: 10px;
    overflow: hidden;
}

#progress-bar {
    height: 100%;
    width: 0%;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

.hidden {
    display: none !important;
}

/* Language Selector */
.lang-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--input-bg);
    padding: 5px 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.lang-icon {
    font-size: 1rem;
}

.lang-select {
    padding: 0;
    border: none;
    background: transparent;
    color: white;
    font-size: 0.8rem;
    cursor: pointer;
    outline: none;
}

.lang-select option {
    background-color: var(--bg-dark);
}

/* Footer (Slim Version) */
.app-footer {
    margin-top: 15px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
    padding: 10px 0;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.donation-section {
    margin-bottom: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.donation-section p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-main);
}

.footer-info {
    text-align: left;
    border-left: 1px solid var(--border-color);
    padding-left: 15px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.footer-info p {
    margin: 1px 0;
}

.model-info {
    font-size: 0.7rem;
    opacity: 0.7;
}