:root {
    --bg-dark: #111115;
    --card-bg: rgba(30, 30, 35, 0.6);
    --primary: #6c5ce7;
    --primary-hover: #5b4cc4;
    --text-main: #ffffff;
    --text-muted: #a0a0a0;
    --border: rgba(255, 255, 255, 0.1);
    --glass-blur: 16px;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

#main-nav-placeholder {
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1000;
    pointer-events: none;
    /* Let clicks pass through to canvas if needed, but nav needs clicks */
}

#main-nav-placeholder * {
    pointer-events: auto;
}

.container {
    display: grid;
    grid-template-columns: 1fr 380px;
    /* Canvas | Sidebar */
    gap: 0;
    padding: 0;
    max-width: none;
    margin: 0;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

@media (max-width: 900px) {
    .container {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr auto;
        /* Canvas top, Controls bottom on mobile */
        overflow-y: auto;
    }
}

.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-left: 1px solid var(--border);
    border-radius: 0;
    /* Full height sidebar */
    padding: 24px;
    box-shadow: -5px 0 32px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    height: 100%;
    box-sizing: border-box;
    order: 2;
    /* Move to right */
    z-index: 10;
}

/* Specific style for Preview Container (Canvas) */
.preview-container {
    padding: 0;
    border: none;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    order: 1;
    /* Move to left */
    overflow: hidden;
    position: relative;
    height: 100%;
}

/* Ensure canvas fills container */
#canvas-container {
    width: 100%;
    height: 100%;
}

h1 {
    font-size: 1.8rem;
    margin: 0 0 5px 0;
    font-weight: 700;
}

p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.upload-area {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.upload-area:hover,
.upload-area.dragover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary);
}

.upload-area .icon {
    font-size: 3rem;
    margin-bottom: 10px;
}

.error-msg {
    color: #ff4757;
    font-weight: bold;
    margin-top: 10px;
    min-height: 20px;
    word-break: break-all;
}

.controls {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.control-group {
    background: rgba(0, 0, 0, 0.2);
    padding: 10px;
    border-radius: 8px;
}

.control-group h3 {
    margin: 0 0 10px 0;
    font-size: 0.9rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.control-group label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.control-group input[type="range"] {
    width: 60%;
    accent-color: var(--primary);
}

.texture-upload {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 5px;
}

.btn.small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.hidden {
    display: none !important;
}

.info-stats {
    display: flex;
    justify-content: space-between;
    font-family: monospace;
    background: rgba(0, 0, 0, 0.2);
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 10px;
}

.btn {
    border: none;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s;
    font-size: 1rem;
}

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

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

.secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

.preview-container {
    padding: 0;
    overflow: hidden;
    position: relative;
    min-height: 300px;
}

#canvas-container {
    width: 100%;
    height: 100%;
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 10px;
}

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

    100% {
        transform: rotate(360deg);
    }
}

.progress-bar {
    width: 200px;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin-top: 10px;
    overflow: hidden;
}

.progress-fill {
    width: 0%;
    height: 100%;
    background: var(--primary);
    transition: width 0.3s ease;
}

/* Modern Controls Overhaul */

/* Sliders */
input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
    margin: 10px 0;
}

/* ... existing code ... */

/* Color Input */
input[type=color] {
    -webkit-appearance: none;
    appearance: none;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    overflow: hidden;
    background: none;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: #ffffff;
    cursor: pointer;
    margin-top: -6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    transition: transform 0.1s ease;
}

input[type=range]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
}

input[type=range]:focus {
    outline: none;
}

/* Checkboxes */
input[type=checkbox] {
    accent-color: var(--primary);
    transform: scale(1.2);
    margin-right: 8px;
    cursor: pointer;
}

/* Buttons */
.btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 12px rgba(108, 92, 231, 0.3);
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(108, 92, 231, 0.4);
}

.btn:active {
    transform: translateY(0);
}

.btn.secondary {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: none;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

.btn.small {
    padding: 6px 12px;
    font-size: 0.8rem;
}

/* Control Groups */
.control-group {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 15px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.control-group h3 {
    margin-top: 0;
    margin-bottom: 12px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 8px;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-main);
    margin-bottom: 8px;
}

.control-group label input[type=range] {
    width: 60%;
}

/* Color Input */
input[type=color] {
    -webkit-appearance: none;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    overflow: hidden;
    background: none;
}

input[type=color]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type=color]::-webkit-color-swatch {
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
}

/* Custom Checkboxes */
input[type=checkbox] {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    vertical-align: middle;
    transition: all 0.2s ease;
}

input[type=checkbox]:checked {
    background: var(--primary);
    border-color: var(--primary);
}

/* Checkmark */
input[type=checkbox]:checked::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

input[type=checkbox]:hover {
    border-color: var(--primary);
    box-shadow: 0 0 8px rgba(108, 92, 231, 0.3);
}