/* Base styles and reset */
:root {
    /* Colors */
    --primary-color: #0066cc;
    --primary-dark: #004e9e;
    --secondary-color: #ff9900;
    --background-color: #f0f2f5;
    --surface-color: #ffffff;
    --text-color: #222222;
    --text-light: #666666;
    --error-color: #d32f2f;
    --success-color: #4caf50;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Sizing */
    --button-size: 56px;
    --border-radius: 12px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html, body {
    height: 100%;
    background-color: var(--background-color);
    color: var(--text-color);
    font-size: 16px;
    overscroll-behavior: none; /* Prevent pull-to-refresh on mobile */
}

.app-container {
    max-width: 1024px; /* Optimized for iPad/tablets */
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    padding: var(--spacing-md) 0 var(--spacing-lg);
}

h1 {
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Upload section */
.upload-section {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl) 0;
}

.upload-prompt {
    text-align: center;
    background-color: var(--surface-color);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 600px;
}

.icon-container {
    margin-bottom: var(--spacing-lg);
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.icon-container svg {
    width: 80px;
    height: 80px;
    color: var(--primary-color);
}

.upload-prompt h2 {
    margin-bottom: var(--spacing-xl);
    font-size: 1.5rem;
    font-weight: 500;
}

/* Editor section */
.editor-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.preview-container {
    display: flex;
    gap: var(--spacing-md);
    overflow-x: auto;
    padding-bottom: var(--spacing-md);
}

.preview-wrapper {
    flex: 1;
    min-width: 0;
}

.preview-heading {
    text-align: center;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.image-container {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow: hidden;
    height: 280px;
}

.image-container img {
    max-width: 100%;
    max-height: 230px;
    object-fit: contain;
    border-radius: var(--spacing-xs);
}

.file-info {
    position: absolute;
    bottom: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--text-light);
    background-color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--spacing-xs);
}

.controls-container {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Slider styling */
.slider-container {
    margin-bottom: var(--spacing-md);
}

.slider-container label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.slider-track {
    position: relative;
    height: 44px;
    display: flex;
    align-items: center;
}

#sliderTrackFill {
    position: absolute;
    height: 6px;
    background-color: var(--primary-color);
    border-radius: 3px;
    left: 0;
    pointer-events: none;
}

input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #e0e0e0;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-color);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-color);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    border: none;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: var(--spacing-sm);
}

/* Buttons */
.button-group {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

button {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    min-height: var(--button-size);
    transition: all 0.2s;
    outline: none;
    position: relative;
    overflow: hidden;
}

.primary-button {
    background-color: var(--primary-color);
    color: white;
    min-width: 140px;
    flex: 1;
}

.primary-button:hover, .primary-button:focus {
    background-color: var(--primary-dark);
}

.primary-button:active {
    transform: scale(0.97);
}

.action-button {
    background-color: var(--surface-color);
    color: var(--text-color);
    border: 1px solid #ddd;
    flex: 1;
    min-width: 100px;
}

.action-button:hover, .action-button:focus {
    background-color: #f8f8f8;
}

.action-button:active {
    transform: scale(0.97);
}

.secondary-button {
    background-color: #f0f0f0;
    color: var(--text-color);
    width: 100%;
}

.secondary-button:hover, .secondary-button:focus {
    background-color: #e5e5e5;
}

.close-button {
    background: none;
    font-size: 1.8rem;
    min-height: auto;
    padding: var(--spacing-xs);
    color: var(--text-light);
}

/* Icons in buttons */
.icon {
    margin-right: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Camera modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 700px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid #eee;
}

.camera-container {
    width: 100%;
    background-color: #000;
    position: relative;
    overflow: hidden;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

#cameraPreview, #cameraCanvas {
    max-width: 100%;
    max-height: 70vh;
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    z-index: 2000;
    min-width: 200px;
    text-align: center;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 3000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

.loading-text {
    font-size: 1.1rem;
    font-weight: 500;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Utility classes */
.hidden {
    display: none !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .preview-container {
        flex-direction: column;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .primary-button, .action-button {
        width: 100%;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .upload-prompt {
        padding: var(--spacing-lg);
    }
    
    .icon-container {
        height: 80px;
    }
    
    .icon-container svg {
        width: 60px;
        height: 60px;
    }
}

@media (max-width: 480px) {
    .app-container {
        padding: var(--spacing-sm);
    }
    
    .controls-container {
        padding: var(--spacing-md);
    }
    
    .preview-container {
        gap: var(--spacing-sm);
    }
    
    .image-container {
        height: 220px;
    }
    
    .image-container img {
        max-height: 170px;
    }
    
    button {
        font-size: 1rem;
    }
}

/* Support for dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #121212;
        --surface-color: #1e1e1e;
        --text-color: #e0e0e0;
        --text-light: #a0a0a0;
        --primary-color: #4c9cff;
        --primary-dark: #3c7fd9;
    }
    
    input[type="range"] {
        background: #383838;
    }
    
    .action-button {
        border-color: #444;
    }
    
    .secondary-button {
        background-color: #2a2a2a;
    }
    
    .file-info {
        background-color: rgba(30, 30, 30, 0.9);
    }
    
    .loading-overlay {
        background-color: rgba(18, 18, 18, 0.8);
    }
    
    .spinner {
        border: 5px solid #333;
        border-top: 5px solid var(--primary-color);
    }
}