:root {
    --bg-color: #1a1a1a;
    --panel-bg: rgba(40, 40, 40, 0.7);
    --accent-color: #ff6b6b; /* Pudding Pink */
    --accent-hover: #ff4757;
    --text-color: #f1f2f6;
    --secondary-text: #a4b0be;
    --border-radius: 12px;
}

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
}

#app {
    position: relative;
    width: 100vw;
    height: 100vh;
}

#canvas-container {
    width: 100%;
    height: 100%;
    /* Subtle grid background */
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    cursor: crosshair;
}

#ui-panel {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 300px;
    max-height: calc(100vh - 40px); /* Account for top margin + padding */
    overflow-y: auto;
    background: var(--panel-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    transition: all 0.3s ease;
    box-sizing: border-box; /* Ensure padding is included in height */
    z-index: 1000; /* Ensure on top */
}

.header h1 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--accent-color);
}

.header p {
    margin: 5px 0 20px;
    font-size: 0.9rem;
    color: var(--secondary-text);
}

.control-group {
    margin-bottom: 20px;
}

input[type="file"] {
    display: none;
}

.custom-file-upload {
    display: block;
    padding: 12px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    text-align: center;
    transition: background 0.2s;
    border: 1px dashed rgba(255, 255, 255, 0.3);
}

.custom-file-upload:hover {
    background: rgba(255, 255, 255, 0.2);
}

button {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    margin-bottom: 8px;
}

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

.primary-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.primary-btn:disabled {
    background-color: #555;
    cursor: not-allowed;
    opacity: 0.6;
}

.secondary-btn {
    background-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
}

.secondary-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.hidden {
    display: none !important;
}

.slider-container {
    margin-bottom: 15px;
}

.slider-container label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 5px;
    color: var(--secondary-text);
}

.slider-container small {
    display: block;
    font-size: 0.7rem;
    color: #666;
    margin-top: 2px;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--accent-color);
}

.status-text {
    font-size: 0.9rem;
    margin-bottom: 10px;
}

#mode-display {
    font-weight: bold;
    color: var(--accent-color);
}