/* Variables */
:root {
    --primary-color: #4a7dff;
    --primary-hover: #3a6ae0;
    --secondary-color: #f5f7ff;
    --accent-color: #ff7a50;
    --text-primary: #333333;
    --text-secondary: #6c757d;
    --border-color: #e0e0e0;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --background-light: #ffffff;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    --transition-speed: 0.3s;
    --border-radius: 8px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

/* Dark Mode Variables */
.dark-mode {
    --primary-color: #5c8fff;
    --primary-hover: #4c7aec;
    --secondary-color: #2a2d3e;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --border-color: #3d4152;
    --background-light: #222533;
    --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

body {
    background-color: var(--background-light);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-speed) ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
header {
    background-color: var(--background-light);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-speed) ease;
}

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

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    margin-right: var(--spacing-sm);
}

.theme-toggle {
    border: none;
    background: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.25rem;
    padding: var(--spacing-sm);
    border-radius: 50%;
    transition: background-color var(--transition-speed) ease;
}

.theme-toggle:hover {
    background-color: var(--secondary-color);
}

/* Main Content */
main {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

.grid-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-gap: var(--spacing-xl);
}

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

/* Card Styling */
.card {
    background-color: var(--background-light);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: all var(--transition-speed) ease;
    height: 100%;
}

.card-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.card-body {
    padding: var(--spacing-md);
}

/* Image Preview Section */
.preview-container {
    position: relative;
    height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--secondary-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-align: center;
    padding: var(--spacing-md);
}

.preview-placeholder i {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.preview-image {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
}

/* Input Controls */
.input-group {
    margin-bottom: var(--spacing-md);
}

.input-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--background-light);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: border-color var(--transition-speed) ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236c757d' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 12px;
    padding-right: 2rem;
}

/* Sliders */
.slider-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.slider-control {
    flex: 1;
}

.range-value {
    min-width: 40px;
    text-align: center;
    font-weight: 500;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 5px;
    background: var(--border-color);
    outline: none;
}

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

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

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-hover);
}

input[type="range"]::-moz-range-thumb:hover {
    background: var(--primary-hover);
}

/* Color Palette */
.color-palette {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.palette-color {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    transition: transform var(--transition-speed) ease;
    border: 2px solid var(--border-color);
}

.palette-color:hover {
    transform: scale(1.1);
}

.palette-color.active {
    border: 2px solid var(--text-primary);
    transform: scale(1.1);
}

.color-display {
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Button Group */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    font-size: 0.9rem;
}

.btn i {
    margin-right: var(--spacing-xs);
}

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

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

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

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

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

.btn-success:hover {
    background-color: #218838;
}

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

.btn-danger:hover {
    background-color: #c82333;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* File Input */
.file-input-container {
    position: relative;
    display: inline-block;
    width: 100%;
}

.file-input-label {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--secondary-color);
    color: var(--text-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color var(--transition-speed) ease;
    text-align: center;
}

.file-input-label:hover {
    background-color: var(--border-color);
}

.file-input-label i {
    margin-right: var(--spacing-sm);
}

.file-input {
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

/* Settings Group */
.settings-group {
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--spacing-lg);
}

.settings-group:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.settings-title {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-md);
    font-weight: 500;
    color: var(--text-primary);
}

.settings-title i {
    margin-right: var(--spacing-sm);
    color: var(--primary-color);
}

/* Footer */
footer {
    background-color: var(--background-light);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--border-color);
    transition: background-color var(--transition-speed) ease;
}

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

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

.footer-links a:hover {
    color: var(--primary-color);
}

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

/* Responsive Adjustments */
@media (max-width: 576px) {
    .btn {
        padding: var(--spacing-sm) var(--spacing-sm);
        font-size: 0.8rem;
    }
    
    .card-header h2 {
        font-size: 1.1rem;
    }
    
    .preview-container {
        height: 250px;
    }
    
    .logo {
        font-size: 1.2rem;
    }
    
    .slider-container {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-xs);
    }
    
    .range-value {
        align-self: flex-end;
    }
}