/* CSS Custom Properties (Variables) */
:root {
    /* Color Palette */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Dark Mode Colors */
    --dark-bg: #0f172a;
    --dark-surface: #1e293b;
    --dark-border: #334155;
    --dark-text: #f1f5f9;
    --dark-text-secondary: #cbd5e1;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-korean: 'Noto Sans KR', sans-serif;
    
    /* Font Sizes */
    --text-2xs: 0.625rem;
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-7: 1.75rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.125rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Layout */
    --container-max-width: 1200px;
    --sidebar-width: 300px;
    --header-height: 80px;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --primary-color: #818cf8;
    --primary-hover: #6366f1;
    --text-color: var(--dark-text);
    --text-secondary: var(--dark-text-secondary);
    --bg-color: var(--dark-bg);
    --surface-color: var(--dark-surface);
    --border-color: var(--dark-border);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--gray-50);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

[data-theme="dark"] body {
    color: var(--dark-text);
    background-color: var(--dark-bg);
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: var(--white);
    padding: var(--space-8) 0;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Ccircle cx='30' cy='30' r='10'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
    opacity: 0.3;
}

.header__content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.header__title {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header__subtitle {
    font-size: var(--text-lg);
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

/* Main Layout */
.main {
    padding: var(--space-8) 0;
    min-height: calc(100vh - var(--header-height));
}



/* Content Area */
.content {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-md);
    min-height: 600px;
}

[data-theme="dark"] .content {
    background: var(--dark-surface);
    border: 1px solid var(--dark-border);
}

/* Upload Section */
.upload-section {
    text-align: center;
    padding: var(--space-8) 0;
}

.upload-area {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-xl);
    padding: var(--space-12);
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .upload-area {
    border-color: var(--dark-border);
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary-color);
    background-color: var(--gray-50);
    transform: translateY(-2px);
}

[data-theme="dark"] .upload-area:hover,
[data-theme="dark"] .upload-area.drag-over {
    background-color: var(--dark-border);
}

.upload-area__icon {
    margin-bottom: var(--space-4);
    color: var(--gray-400);
}

[data-theme="dark"] .upload-area__icon {
    color: var(--dark-text-secondary);
}

.upload-area__title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--gray-900);
}

[data-theme="dark"] .upload-area__title {
    color: var(--dark-text);
}

.upload-area__subtitle {
    font-size: var(--text-lg);
    color: var(--gray-600);
    margin-bottom: var(--space-4);
}

[data-theme="dark"] .upload-area__subtitle {
    color: var(--dark-text-secondary);
}

.upload-area__info {
    font-size: var(--text-sm);
    color: var(--gray-500);
    margin-bottom: var(--space-6);
}

[data-theme="dark"] .upload-area__info {
    color: var(--dark-text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    outline: none;
    position: relative;
    overflow: hidden;
}

.btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

.btn--primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.btn--primary:active {
    transform: translateY(0);
}

.btn--secondary {
    background-color: var(--gray-100);
    color: var(--gray-900);
    border: 1px solid var(--gray-200);
}

[data-theme="dark"] .btn--secondary {
    background-color: var(--dark-border);
    color: var(--dark-text);
    border-color: var(--dark-border);
}

.btn--secondary:hover {
    background-color: var(--gray-200);
    transform: translateY(-1px);
}

[data-theme="dark"] .btn--secondary:hover {
    background-color: var(--gray-700);
}

.btn--large {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

/* Processing Section */
.processing-section {
    text-align: center;
    padding: var(--space-12) 0;
}

.processing-animation {
    margin-bottom: var(--space-8);
}

.spinner {
    width: 64px;
    height: 64px;
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary-color);
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-4);
}

[data-theme="dark"] .spinner {
    border-color: var(--dark-border);
    border-top-color: var(--primary-color);
}

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

.processing-title {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--gray-900);
}

[data-theme="dark"] .processing-title {
    color: var(--dark-text);
}

.processing-subtitle {
    font-size: var(--text-lg);
    color: var(--gray-600);
}

[data-theme="dark"] .processing-subtitle {
    color: var(--dark-text-secondary);
}

.processing-steps {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    margin-top: var(--space-8);
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    opacity: 0.4;
    transition: opacity var(--transition-normal);
}

.step.active {
    opacity: 1;
}

.step-icon {
    width: 40px;
    height: 40px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--gray-600);
    transition: all var(--transition-normal);
}

[data-theme="dark"] .step-icon {
    background: var(--dark-border);
    color: var(--dark-text-secondary);
}

.step.active .step-icon {
    background: var(--primary-color);
    color: var(--white);
}

.step-text {
    font-size: var(--text-sm);
    color: var(--gray-600);
    text-align: center;
}

[data-theme="dark"] .step-text {
    color: var(--dark-text-secondary);
}

/* Result Section */
.result-section {
    padding: var(--space-8) 0;
}

.result-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--space-8);
    align-items: start;
}

.result-preview {
    text-align: center;
}

#resultCanvas {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--space-6);
}

/* iOS-specific image element for saving */
.result-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--space-6);
    display: none;
    cursor: pointer;
    
    /* iOS-specific properties for better saving */
    -webkit-user-select: none;
    -webkit-touch-callout: default;
    -webkit-user-drag: auto;
    user-select: none;
    
    /* Smooth transitions for touch feedback */
    transition: opacity 0.2s ease, transform 0.2s ease;
}

/* iOS touch feedback */
.result-image:active {
    opacity: 0.9;
    transform: scale(0.98);
}

/* Ensure the image is selectable on iOS */
.result-image[data-ios-saveable="true"] {
    -webkit-touch-callout: default !important;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    
    /* Allow image to be saved */
    pointer-events: auto;
}

.result-info {
    text-align: left;
    max-width: 600px;
    margin: 0 auto;
}

.result-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--gray-900);
}

[data-theme="dark"] .result-title {
    color: var(--dark-text);
}

.result-quote {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-style: italic;
    color: var(--gray-700);
    margin-bottom: var(--space-3);
    line-height: 1.7;
}

[data-theme="dark"] .result-quote {
    color: var(--dark-text-secondary);
}

.result-source {
    font-size: var(--text-sm);
    color: var(--gray-500);
    font-weight: 500;
}

[data-theme="dark"] .result-source {
    color: var(--dark-text-secondary);
}

.result-actions {
    background: var(--gray-50);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    position: sticky;
    top: var(--space-8);
}

[data-theme="dark"] .result-actions {
    background: var(--dark-bg);
    border: 1px solid var(--dark-border);
}

.download-options h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--gray-900);
}

[data-theme="dark"] .download-options h4 {
    color: var(--dark-text);
}

.format-selector {
    margin-bottom: var(--space-6);
}

.format-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    cursor: pointer;
}

.format-label input[type="radio"] {
    accent-color: var(--primary-color);
}

.format-label span {
    font-size: var(--text-sm);
    color: var(--gray-700);
}

[data-theme="dark"] .format-label span {
    color: var(--dark-text-secondary);
}

.resolution-selector {
    margin-bottom: var(--space-6);
}

.resolution-selector label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    margin-bottom: var(--space-2);
    color: var(--gray-700);
}

[data-theme="dark"] .resolution-selector label {
    color: var(--dark-text-secondary);
}

.resolution-selector select {
    width: 100%;
    padding: var(--space-3);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    background: var(--white);
    color: var(--gray-900);
}

[data-theme="dark"] .resolution-selector select {
    background: var(--dark-surface);
    border-color: var(--dark-border);
    color: var(--dark-text);
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* iPhone Instructions */
.iphone-instructions {
    margin: var(--space-4) 0;
    padding: var(--space-4);
    background: linear-gradient(135deg, #007AFF, #5856D6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.5s ease-out;
}

.iphone-instructions__content {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--white);
    text-align: left;
}

.iphone-instructions__icon {
    font-size: var(--text-2xl);
    flex-shrink: 0;
}

.iphone-instructions__text {
    font-size: var(--text-sm);
    line-height: 1.5;
}

.iphone-instructions__text strong {
    font-weight: 600;
    display: block;
    margin-bottom: var(--space-1);
}

.iphone-instructions__text small {
    opacity: 0.9;
    font-size: var(--text-xs);
    color: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .iphone-instructions {
    background: linear-gradient(135deg, #0066CC, #4A4A9A);
    border: 1px solid var(--dark-border);
}

/* Ad Containers */
.ad-container {
    margin: var(--space-8) 0;
    text-align: center;
}

.ad-container--header {
    margin-top: var(--space-6);
}

.ad-container--sidebar {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
}

[data-theme="dark"] .ad-container--sidebar {
    border-top-color: var(--dark-border);
}

.ad-container--content {
    margin: var(--space-12) 0;
}

.ad-container--footer {
    margin-bottom: var(--space-6);
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--space-8) 0;
    margin-top: var(--space-16);
}

[data-theme="dark"] .footer {
    background: var(--dark-surface);
    border-top: 1px solid var(--dark-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer-links {
    display: flex;
    gap: var(--space-6);
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

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

/* Toast Notifications */
.toast {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    background: var(--error-color);
    color: var(--white);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    transform: translateX(100%);
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

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

.toast__content {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.toast__icon {
    font-size: var(--text-lg);
}

.toast__message {
    font-size: var(--text-sm);
    font-weight: 500;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 56px;
    height: 56px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 100;
    transition: all var(--transition-normal);
}

[data-theme="dark"] .theme-toggle {
    background: var(--dark-surface);
    border-color: var(--dark-border);
    color: var(--dark-text);
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle__icon {
    transition: all var(--transition-normal);
}

.theme-toggle__icon--dark {
    display: none;
}

[data-theme="dark"] .theme-toggle__icon--light {
    display: none;
}

[data-theme="dark"] .theme-toggle__icon--dark {
    display: block;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

/* Utility Classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.font-bold {
    font-weight: 700;
}

.font-semibold {
    font-weight: 600;
}

.font-medium {
    font-weight: 500;
}

.opacity-50 {
    opacity: 0.5;
}

.opacity-75 {
    opacity: 0.75;
}

.pointer-events-none {
    pointer-events: none;
}

.cursor-pointer {
    cursor: pointer;
}

.cursor-not-allowed {
    cursor: not-allowed;
}

.select-none {
    user-select: none;
}

.overflow-hidden {
    overflow: hidden;
}

.relative {
    position: relative;
}

.absolute {
    position: absolute;
}

.fixed {
    position: fixed;
}

.inset-0 {
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

.z-10 {
    z-index: 10;
}

.z-20 {
    z-index: 20;
}

.z-30 {
    z-index: 30;
}

.z-40 {
    z-index: 40;
}

.z-50 {
    z-index: 50;
}