:root {
    --bg-dark: #121212;
    --bg-panel: #1e1e1e;
    --bg-input: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent-color: #00ff88;
    --accent-hover: #00cc6a;
    --border-color: #333;
    --spacing: 16px;
    --border-radius: 8px;
}

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

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

header {
    background-color: var(--bg-panel);
    padding: var(--spacing);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing);
    position: relative;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-title {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

header h1 {
    font-size: 1.5rem;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-left: 36px;
}

.history-btn {
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.history-btn:hover {
    background: #3d3d3d;
    color: var(--accent-color);
}

/* History Panel */
.history-panel {
    position: fixed;
    top: 80px;
    right: 20px;
    width: 320px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    z-index: 999;
    display: none;
    flex-direction: column;
    max-height: 80vh;
}

.history-panel.active {
    display: flex;
}

.history-header {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-header h3 {
    font-size: 1rem;
    color: var(--accent-color);
}

.history-actions {
    display: flex;
    gap: 10px;
}

.history-actions button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    transition: color 0.2s;
    padding: 5px;
}

#clearHistoryBtn:hover {
    color: #ff4444;
}

#closeHistoryBtn:hover {
    color: #fff;
}

.history-grid {
    padding: 10px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    overflow-y: auto;
}

.history-item {
    position: relative;
    aspect-ratio: 1;
    background: #000;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.2s;
}

.history-item:hover {
    border-color: var(--accent-color);
}

.history-item img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    /* Show transparency grid */
    background-image: linear-gradient(45deg, #252525 25%, transparent 25%), 
                      linear-gradient(-45deg, #252525 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #252525 75%), 
                      linear-gradient(-45deg, transparent 75%, #252525 75%);
    background-size: 10px 10px;
}

.history-delete {
    position: absolute;
    bottom: 2px;
    right: 2px;
    background: rgba(0,0,0,0.7);
    color: #ff4444;
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.8rem;
    opacity: 0;
    transition: opacity 0.2s;
}

.history-item:hover .history-delete {
    opacity: 1;
}

.history-delete:hover {
    background: #fff;
}

/* Buy Me A Coffee Widget */
.coffee-widget {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
}

.coffee-icon {
    width: 50px;
    height: 50px;
    background: #ff6b6b;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    animation: heartbeat 2s infinite;
    transition: transform 0.2s;
}

.coffee-icon:hover {
    transform: scale(1.1);
    animation: none;
}

@keyframes heartbeat {
    0% { transform: scale(1); }
    10% { transform: scale(1.1); }
    20% { transform: scale(1); }
    30% { transform: scale(1.1); }
    40% { transform: scale(1); }
    100% { transform: scale(1); }
}

.coffee-popup {
    position: absolute;
    bottom: 70px;
    right: 0;
    width: 250px;
    background: white;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.3);
    display: none;
    transform-origin: bottom right;
    animation: popIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.coffee-widget:hover .coffee-popup {
    display: block;
}

@keyframes popIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

.coffee-content {
    text-align: center;
    color: #333;
}

.coffee-content img {
    width: 100%;
    border-radius: 8px;
    margin-bottom: 10px;
    border: 2px solid #ff6b6b;
}

.coffee-content p {
    font-weight: bold;
    font-size: 1rem;
    color: #ff6b6b;
}

/* Main Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing);
}

.intro-text {
    margin-bottom: 20px;
    padding: 15px;
    background-color: var(--bg-panel);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.intro-text h2 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.layout {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing);
    height: calc(100vh - 200px);
}

@media (max-width: 768px) {
    .layout {
        grid-template-columns: 1fr;
        height: auto;
    }
}

/* Preview Section */
.preview-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing);
}

.canvas-container {
    flex: 1;
    background-color: #333;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--border-color);
    min-height: 400px;
}

/* Background Patterns */
.bg-grid {
    background-image: linear-gradient(45deg, #252525 25%, transparent 25%), 
                      linear-gradient(-45deg, #252525 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #252525 75%), 
                      linear-gradient(-45deg, transparent 75%, #252525 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.bg-dark { background-color: #1a1a1a; }
.bg-light { background-color: #e0e0e0; }

canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.bg-controls {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    padding: 5px;
    border-radius: 20px;
    display: flex;
    gap: 5px;
}

.bg-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 5px 10px;
    cursor: pointer;
    border-radius: 15px;
    font-size: 0.8rem;
    transition: all 0.2s;
}

.bg-btn:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
}

.bg-btn.active {
    background: var(--accent-color);
    color: #000;
}

/* Export Controls */
.export-settings {
    background-color: var(--bg-panel);
    padding: 10px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 15px;
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.setting-item input[type="number"] {
    width: 70px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 5px;
    border-radius: 4px;
    text-align: center;
}

.export-controls {
    display: flex;
    gap: 10px;
}

button.primary-btn, button.secondary-btn {
    padding: 10px 20px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.1s, opacity 0.2s;
}

button.primary-btn {
    background-color: var(--accent-color);
    color: #000;
    flex: 2;
    justify-content: center;
}

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

button.secondary-btn {
    background-color: var(--bg-input);
    color: var(--text-primary);
    flex: 1;
    justify-content: center;
}

button.secondary-btn:hover {
    background-color: #3d3d3d;
}

/* Controls Section */
.controls-section {
    background-color: var(--bg-panel);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    overflow-y: auto;
    max-height: 100%;
}

.accordion-item {
    border-bottom: 1px solid var(--border-color);
}

.accordion-header {
    padding: 15px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    background-color: rgba(255, 255, 255, 0.02);
    transition: background-color 0.2s;
}

.accordion-header:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.accordion-content {
    padding: 15px;
    display: none;
}

.accordion-item.active .accordion-content {
    display: block;
}

.accordion-item.active .accordion-header i {
    transform: rotate(180deg);
}

/* Form Controls */
.control-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    background: var(--bg-input);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    margin-bottom: 0; /* Override previous */
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    transition: transform 0.1s;
}

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

input[type="number"] {
    width: 60px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 4px;
    border-radius: 4px;
    text-align: center;
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

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

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.checkbox-row label {
    margin-bottom: 0;
    cursor: pointer;
    color: var(--text-primary);
}

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

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-input);
    padding: 5px;
    border-radius: var(--border-radius);
}

input[type="color"] {
    border: none;
    width: 40px;
    height: 40px;
    cursor: pointer;
    background: none;
}

#colorHex {
    font-family: monospace;
    color: var(--text-primary);
}

.slider-group.indented {
    padding-left: 10px;
    border-left: 2px solid var(--border-color);
}

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

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

::-webkit-scrollbar-thumb {
    background: #444;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}