/* CSS Variables */
:root {
    --primary-color: #e94560;
    --primary-hover: #d63850;
    --secondary-color: #0f3460;
    --bg-dark: #1a1a2e;
    --bg-darker: #16213e;
    --bg-card: #1f2a48;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: #2a3f5f;
    --success-color: #4caf50;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

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

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

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

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), #ff8a80);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 300px 1fr 280px;
    flex: 1;
    overflow: hidden;
}

/* Control Panels */
.controls-panel, .library-panel {
    background: var(--bg-darker);
    padding: 1.5rem;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

.library-panel {
    border-right: none;
    border-left: 1px solid var(--border-color);
}

.control-section {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.control-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.control-section h2, .library-panel h2 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* Pattern Selector */
.pattern-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.pattern-btn {
    aspect-ratio: 1;
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.pattern-btn svg {
    width: 24px;
    height: 24px;
    fill: var(--text-secondary);
    stroke: var(--text-secondary);
    stroke-width: 1;
}

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

.pattern-btn:hover svg {
    fill: var(--primary-color);
    stroke: var(--primary-color);
}

.pattern-btn.active {
    background: var(--secondary-color);
    border-color: var(--primary-color);
}

.pattern-btn.active svg {
    fill: var(--primary-color);
    stroke: var(--primary-color);
}

/* Control Groups */
.control-group {
    margin-bottom: 1rem;
}

.control-group:last-child {
    margin-bottom: 0;
}

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

.control-group input[type="range"] {
    width: calc(100% - 50px);
    height: 6px;
    background: var(--bg-card);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    vertical-align: middle;
}

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

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 10px var(--primary-color);
}

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

.value-display {
    display: inline-block;
    width: 45px;
    text-align: right;
    font-size: 0.875rem;
    color: var(--primary-color);
    font-weight: 500;
}

/* Color Controls */
.color-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.color-group {
    flex: 1;
    min-width: 70px;
}

.color-group label {
    display: block;
    font-size: 0.75rem;
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
}

.color-group input[type="color"] {
    width: 100%;
    height: 36px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    background: var(--bg-card);
    padding: 2px;
}

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

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

.checkbox-group {
    margin-top: 1rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

.gradient-colors {
    margin-top: 1rem;
    display: flex;
    gap: 1rem;
}

/* Color Presets */
.color-presets {
    margin-top: 1rem;
}

.color-presets h3 {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.preset-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.preset-btn {
    width: 32px;
    height: 32px;
    border: 2px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    padding: 2px;
    background: var(--bg-card);
    transition: var(--transition);
}

.preset-btn span {
    display: block;
    width: 100%;
    height: 100%;
    border-radius: 4px;
}

.preset-btn:hover {
    border-color: var(--primary-color);
    transform: scale(1.1);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
    margin-bottom: 0.5rem;
}

.btn:last-child {
    margin-bottom: 0;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    background: #143d6e;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--bg-card);
    border-color: var(--primary-color);
}

.btn-full {
    width: 100%;
}

/* Preview Area */
.preview-area {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: var(--bg-dark);
    overflow: hidden;
}

.preview-container {
    width: 100%;
    max-width: 600px;
    aspect-ratio: 1;
    background: #1a1a2e;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

#patternSvg {
    width: 100%;
    height: 100%;
}

/* Library Panel */
.library-info {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.library-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-top: 1rem;
}

.library-item {
    position: relative;
    aspect-ratio: 1;
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.library-item:hover {
    border-color: var(--primary-color);
    transform: scale(1.02);
}

.library-item svg {
    width: 100%;
    height: 100%;
}

.library-item-actions {
    position: absolute;
    top: 4px;
    right: 4px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: var(--transition);
}

.library-item:hover .library-item-actions {
    opacity: 1;
}

.library-item-actions button {
    width: 24px;
    height: 24px;
    border: none;
    border-radius: 4px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.library-item-actions button:hover {
    background: var(--primary-color);
}

.library-item-actions button svg {
    width: 14px;
    height: 14px;
}

.library-empty {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-secondary);
}

.library-empty svg {
    margin-bottom: 1rem;
    fill: var(--text-secondary);
}

.library-empty p {
    font-size: 0.875rem;
}

/* Footer */
.footer {
    background: var(--bg-darker);
    padding: 1rem 2rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

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

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.footer a:hover {
    color: #ff8a80;
    text-decoration: underline;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
    border-left: 4px solid var(--success-color);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 280px 1fr;
    }

    .library-panel {
        display: none;
    }
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
    }

    .controls-panel {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        max-height: 350px;
        overflow-y: auto;
    }

    .pattern-selector {
        grid-template-columns: repeat(8, 1fr);
    }

    .control-section {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }

    .control-section h2 {
        grid-column: 1 / -1;
    }

    .control-section.actions {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .control-section.actions .btn {
        flex: 1;
        min-width: 120px;
        margin-bottom: 0;
    }

    .preview-area {
        padding: 1rem;
    }

    .preview-container {
        max-width: 100%;
        aspect-ratio: 1;
    }
}

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

    .logo h1 {
        font-size: 1.2rem;
    }

    .tagline {
        font-size: 0.8rem;
    }

    .controls-panel {
        padding: 1rem;
    }

    .pattern-selector {
        grid-template-columns: repeat(4, 1fr);
    }

    .control-section {
        grid-template-columns: 1fr;
    }

    .color-controls {
        flex-direction: row;
    }

    .control-section.actions {
        flex-direction: column;
    }

    .control-section.actions .btn {
        width: 100%;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Animation */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.preview-container {
    animation: fadeIn 0.5s ease;
}