:root {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --panel-border: rgba(148, 163, 184, 0.1);
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #64748b;
    --secondary-hover: #475569;
    --success: #10b981;
    --danger: #ef4444;
    --info: #0ea5e9;
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --font-heading: 'Press Start 2P', cursive;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    background-image:
        radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.15) 0%, transparent 20%);
    color: var(--text-color);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

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

::-webkit-scrollbar-track {
    background: transparent;
}

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

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

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--panel-border);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo i {
    font-size: 1.5rem;
    color: var(--primary);
}

.logo h1 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    background: linear-gradient(to right, var(--primary), #a855f7);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.5;
}

#langSelect {
    background: var(--panel-bg);
    color: var(--text-color);
    border: 1px solid var(--panel-border);
    padding: 6px 12px;
    border-radius: 8px;
    font-family: var(--font-body);
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

#langSelect:hover {
    border-color: var(--primary);
}

/* Main Layout */
.main-layout {
    flex: 1;
    display: flex;
    gap: 2rem;
    padding: 2rem;
    overflow: hidden;
    /* Prevent body scroll, let children scroll */
}

/* Sidebar */
.sidebar {
    width: 300px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    backdrop-filter: blur(12px);
    overflow-y: auto;
    flex-shrink: 0;
    box-shadow: var(--shadow);
}

.tool-group {
    background: rgba(255, 255, 255, 0.03);
    padding: 1rem;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.tool-group h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 12px;
    font-weight: 700;
}

.input-row {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.input-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-wrapper label {
    font-size: 0.8rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 6px;
}

input[type="number"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    padding: 8px;
    color: #fff;
    font-family: var(--font-body);
}

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

/* Color Picker Styling */
.color-picker-wrapper {
    margin-bottom: 12px;
}

.color-input-container {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(0, 0, 0, 0.3);
    padding: 5px;
    border-radius: 6px;
    border: 1px solid var(--panel-border);
    cursor: pointer;
}

input[type="color"] {
    -webkit-appearance: none;
    border: none;
    width: 100%;
    height: 36px;
    padding: 0;
    background: transparent;
    cursor: pointer;
    border-radius: 4px;
    overflow: hidden;
}

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

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

/* Buttons */
.btn {
    width: 100%;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 8px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn:active {
    transform: translateY(1px);
    box-shadow: none;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

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

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

.btn-secondary.active {
    background: var(--danger);
    outline: 2px solid white;
    animation: pulse 1s infinite;
}

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

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.5);
}

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

.btn-info {
    background: rgba(14, 165, 233, 0.2);
    color: var(--info);
    border: 1px solid rgba(14, 165, 233, 0.5);
}

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

.btn-warning {
    background: rgba(245, 158, 11, 0.2);
    color: #f59e0b;
    border: 1px solid rgba(245, 158, 11, 0.5);
}

.btn-warning:hover {
    background: #f59e0b;
    color: white;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4);
    }

    70% {
        box-shadow: 0 0 0 6px rgba(239, 68, 68, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0);
    }
}

/* Canvas Area */
.canvas-section {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(15, 23, 42, 0.3);
    border: 2px dashed rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 2rem;
    overflow: auto;
    position: relative;
}

#pixelart-container {
    background: #1e293b;
    padding: 20px;
    border-radius: 4px;
    box-shadow: var(--shadow-lg);
    display: flex;
    justify-content: center;
    align-items: center;
}

#pixelart {
    display: grid;
    gap: 1px;
    background-color: #64748b; /* Lighter color for grid lines */
    /* Grid lines color */
    border: 1px solid #64748b;
    user-select: none;
}

.pixel {
    width: 20px;
    height: 20px;
    background-color: #1e293b; /* Darker/different bg for empty pixels */
    /* Default bg */
    transition: background-color 0.1s;
    cursor: crosshair;
}

.pixel:hover {
    filter: brightness(1.2);
    box-shadow: inset 0 0 4px rgba(255, 255, 255, 0.5);
}

/* Footer */
footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--panel-border);
    background: var(--panel-bg);
}

/* Responsive Design */
@media (max-width: 900px) {
    .main-layout {
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
        overflow-y: auto;
        /* Enable scroll on mobile */
    }

    .sidebar {
        width: 100%;
        order: 2;
        /* Move controls to bottom */
        flex-direction: row;
        flex-wrap: wrap;
        gap: 10px;
        padding: 12px;
    }

    .tool-group {
        flex: 1 1 200px;
        /* Grow to fill space, min 200px */
        margin: 0;
    }

    .canvas-section {
        order: 1;
        min-height: 50vh;
        padding: 1rem;
    }

    .logo h1 {
        font-size: 1rem;
    }
}

@media (max-width: 600px) {
    header {
        padding: 0.8rem 1rem;
    }

    .sidebar {
        height: auto;
        overflow: visible;
        padding-bottom: 2rem;
    }

    .pixel {
        width: 16px;
        /* Smaller pixels on mobile */
        height: 16px;
    }

    .logo h1 {
        display: none;
        /* Hide text on small screens, keep icon */
    }

    .logo i {
        font-size: 1.8rem;
    }
}