/* CSS Variables */
:root {
    --primary-color: #667eea;
    --primary-dark: #5a6fd6;
    --secondary-color: #764ba2;
    --background-color: #0f0f1a;
    --surface-color: #1a1a2e;
    --surface-light: #252542;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b8;
    --border-color: #333355;
    --success-color: #4caf50;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition: all 0.2s ease;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 600;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 2rem;
    padding: 2rem;
    flex: 1;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Controls Panel */
.controls-panel {
    background: var(--surface-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    height: fit-content;
    position: sticky;
    top: 1rem;
}

.controls-panel h2 {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

/* Control Groups */
.control-group {
    margin-bottom: 1.25rem;
}

.control-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.control-group label span {
    color: var(--primary-color);
    font-weight: 500;
}

/* Select */
select {
    width: 100%;
    padding: 0.625rem 0.75rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

select:hover, select:focus {
    border-color: var(--primary-color);
    outline: none;
}

/* Input */
input[type="number"] {
    width: 100%;
    padding: 0.625rem 0.75rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
}

input[type="number"]:focus {
    border-color: var(--primary-color);
    outline: none;
}

/* Seed Controls */
.seed-controls {
    display: flex;
    gap: 0.5rem;
}

.seed-controls input {
    flex: 1;
}

/* Range Input */
input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--surface-light);
    border-radius: 3px;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--gradient);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--gradient);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* Checkbox */
input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
    margin-right: 0.5rem;
    vertical-align: middle;
}

.control-group label:has(input[type="checkbox"]) {
    display: flex;
    align-items: center;
    cursor: pointer;
    color: var(--text-primary);
}

/* Color Input */
input[type="color"] {
    width: 100%;
    height: 40px;
    padding: 4px;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 2px;
}

input[type="color"]::-webkit-color-swatch {
    border-radius: 4px;
    border: none;
}

/* Color Controls */
.color-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.color-controls label {
    font-size: 0.75rem;
}

/* Resolution Buttons */
.resolution-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.resolution-btn {
    padding: 0.5rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition);
}

.resolution-btn:hover {
    border-color: var(--primary-color);
    color: var(--text-primary);
}

.resolution-btn.active {
    background: var(--gradient);
    border-color: transparent;
    color: white;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-small {
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    gap: 0.375rem;
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.action-buttons .btn {
    width: 100%;
}

/* Preview Panel */
.preview-panel {
    background: var(--surface-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.preview-panel h2 {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.preview-container {
    position: relative;
    aspect-ratio: 1;
    max-width: 600px;
    margin: 0 auto;
    background: var(--surface-light);
    border-radius: var(--border-radius);
    overflow: hidden;
}

#previewCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 15, 26, 0.9);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    color: var(--text-secondary);
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--surface-light);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Preview Info */
.preview-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

#textureInfo {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Tile Preview */
.tile-preview {
    margin-top: 1.5rem;
    display: none;
}

.tile-preview.active {
    display: block;
}

.tile-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    background: var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    max-width: 600px;
    margin: 0 auto;
}

.tile-grid canvas {
    width: 100%;
    aspect-ratio: 1;
    display: block;
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.footer a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Hidden controls */
.control-group.hidden {
    display: none;
}

/* Responsive Design */
@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
        padding: 1rem;
    }

    .controls-panel {
        position: static;
    }

    .preview-container {
        max-width: 100%;
    }
}

@media (max-width: 600px) {
    .header {
        padding: 1.5rem 1rem;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .tagline {
        font-size: 0.875rem;
    }

    .resolution-buttons {
        grid-template-columns: repeat(2, 1fr);
    }

    .preview-info {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .tile-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Print styles */
@media print {
    .controls-panel,
    .action-buttons {
        display: none;
    }
}