/* Apple Design System - Image Converter */

/* CSS Variables */
:root {
    /* Colors - Apple Design */
    --primary-color: #007AFF;
    --primary-hover: #0051D5;
    --secondary-color: #5856D6;
    --success-color: #34C759;
    --background: #F2F2F7;
    --surface: rgba(255, 255, 255, 0.72);
    --text-primary: #000000;
    --text-secondary: #3C3C43;
    --text-tertiary: #8E8E93;
    --border-color: rgba(0, 0, 0, 0.1);
    
    /* Typography - San Francisco */
    --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --background: #000000;
        --surface: rgba(28, 28, 30, 0.72);
        --text-primary: #FFFFFF;
        --text-secondary: #E5E5EA;
        --text-tertiary: #8E8E93;
        --border-color: rgba(255, 255, 255, 0.1);
    }
}

/* Manual Dark Mode */
:root[data-theme="dark"] {
    --background: #000000;
    --surface: rgba(28, 28, 30, 0.72);
    --text-primary: #FFFFFF;
    --text-secondary: #E5E5EA;
    --text-tertiary: #8E8E93;
    --border-color: rgba(255, 255, 255, 0.1);
}

/* Manual Light Mode */
:root[data-theme="light"] {
    --background: #F2F2F7;
    --surface: rgba(255, 255, 255, 0.72);
    --text-primary: #000000;
    --text-secondary: #3C3C43;
    --text-tertiary: #8E8E93;
    --border-color: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: var(--font-system);
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Safe Area Support for iOS */
body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-top: var(--spacing-lg);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    position: relative;
}

.header-text {
    flex: 1;
    text-align: center;
}

.app-title {
    font-size: 34px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: var(--spacing-xs);
}

.app-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Theme Toggle Button */
.theme-toggle {
    position: absolute;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    background: var(--surface);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 50%;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.theme-toggle:active {
    transform: scale(0.95);
}

.theme-icon {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

:root[data-theme="dark"] .sun-icon {
    display: none;
}

:root[data-theme="dark"] .moon-icon {
    display: block;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .sun-icon {
        display: none;
    }
    
    :root:not([data-theme="light"]) .moon-icon {
        display: block;
    }
}

/* Main Content */
.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

/* Glass Card Effect */
.glass-card {
    background: var(--surface);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
    box-shadow: var(--shadow-lg);
}

/* Section Title */
.section-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.3px;
}

.section-description {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.4;
}

/* Upload Section */
.upload-mode-selector {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    background: var(--background);
    padding: 4px;
    border-radius: var(--radius-md);
}

.mode-button {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font-system);
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s;
}

.mode-button:hover {
    background: rgba(0, 122, 255, 0.05);
}

.mode-button.active {
    background: var(--primary-color);
    color: white;
}

.mode-button:active {
    transform: scale(0.98);
}

.mode-icon {
    width: 24px;
    height: 24px;
}

.upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl) var(--spacing-lg);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: 200px;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: rgba(0, 122, 255, 0.05);
}

.upload-area:active {
    transform: scale(0.98);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.upload-text {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.upload-hint {
    font-size: 13px;
    color: var(--text-tertiary);
}

/* Image Preview */
.image-preview {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.image-preview img {
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: contain;
    border-radius: var(--radius-md);
    background: var(--background);
}

.image-info {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.03);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
}

.image-info.success {
    background: rgba(52, 199, 89, 0.1);
    color: var(--success-color);
}

/* Settings */
.preset-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.preset-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    background: var(--background);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-system);
}

.preset-button:hover {
    border-color: var(--primary-color);
    background: rgba(0, 122, 255, 0.05);
}

.preset-button.active {
    border-color: var(--primary-color);
    background: rgba(0, 122, 255, 0.1);
}

.preset-button:active {
    transform: scale(0.98);
}

.preset-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.preset-desc {
    font-size: 13px;
    color: var(--text-tertiary);
}

.setting-group {
    margin-bottom: var(--spacing-lg);
}

.setting-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 15px;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.quality-value {
    color: var(--primary-color);
    font-weight: 600;
}

.setting-hint {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-top: var(--spacing-xs);
}

/* Slider */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: var(--border-color);
    outline: none;
    margin-bottom: var(--spacing-xs);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.slider::-webkit-slider-thumb:active {
    transform: scale(0.95);
}

.slider::-moz-range-thumb {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

/* Resize Inputs */
.resize-inputs {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.resize-separator {
    color: var(--text-tertiary);
    font-size: 17px;
}

/* Input Fields */
.input-field {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 17px;
    font-family: var(--font-system);
    background: var(--background);
    color: var(--text-primary);
    transition: all 0.2s;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.input-field::placeholder {
    color: var(--text-tertiary);
}

/* Buttons */
.primary-button,
.secondary-button {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 17px;
    font-weight: 600;
    font-family: var(--font-system);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.primary-button {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.primary-button:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-md);
}

.primary-button:active {
    transform: scale(0.98);
}

.secondary-button {
    background: var(--background);
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}

.secondary-button:hover {
    background: rgba(0, 122, 255, 0.05);
}

.secondary-button:active {
    transform: scale(0.98);
}

.button-icon {
    width: 20px;
    height: 20px;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: white;
    font-size: 17px;
    font-weight: 500;
    margin-top: var(--spacing-md);
}

.loading-progress {
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
    margin-top: var(--spacing-xs);
}

/* Error Toast */
.error-toast {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(255, 59, 48, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    max-width: 90%;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.error-message {
    font-size: 15px;
    font-weight: 500;
    text-align: center;
    margin: 0;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xl);
}

.footer-text {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 400;
}

/* Format Comparison Styles */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

@media (min-width: 700px) {
    .comparison-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.format-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--background);
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.format-card.best-format {
    border-color: var(--success-color);
    box-shadow: 0 0 0 1px var(--success-color);
}

.format-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xs);
    min-height: 24px;
}

.format-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #fff;
}

.format-badge-webp { background: #34C759; }
.format-badge-jpeg { background: #007AFF; }
.format-badge-png  { background: #FF9500; }
.format-badge-jxl  { background: #AF52DE; }

.best-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    background: var(--success-color);
    color: #fff;
}

.format-preview {
    width: 100%;
    aspect-ratio: 4 / 3;
    object-fit: cover;
    border-radius: var(--radius-sm);
    background: var(--border-color);
}

.format-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.format-size {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.format-savings {
    font-size: 13px;
    font-weight: 500;
}

.savings-positive { color: var(--success-color); }
.savings-negative { color: #FF3B30; }

.format-dimensions {
    font-size: 12px;
    color: var(--text-tertiary);
}

.format-unavailable {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    text-align: center;
    color: var(--text-tertiary);
    min-height: 80px;
    gap: 4px;
}

.format-error-msg {
    font-size: 11px;
    color: var(--text-tertiary);
}

.download-format-btn {
    margin-top: auto;
    font-size: 13px;
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 40px;
}

/* Comparison section full-width in desktop grid layout */
@media (min-width: 1024px) {
    .comparison-section {
        grid-column: 1 / -1;
    }
}

/* Responsive Design */
@media (min-width: 768px) {
    .app-container {
        padding: var(--spacing-xl);
    }
    
    .app-title {
        font-size: 48px;
    }
    
    .app-subtitle {
        font-size: 20px;
    }
    
    .glass-card {
        padding: var(--spacing-xl);
    }
    
    .preset-buttons {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .action-buttons {
        flex-direction: row;
    }
    
    .action-buttons button {
        width: auto;
        flex: 1;
    }
}

@media (max-width: 767px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .theme-toggle {
        position: static;
    }
}

@media (min-width: 1024px) {
    .app-main {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xl);
    }
    
    .upload-section {
        grid-column: 1 / -1;
    }
    
    .result-section {
        grid-column: 1 / -1;
    }
}

/* Touch Device Optimizations */
@media (hover: none) and (pointer: coarse) {
    .primary-button,
    .secondary-button,
    .upload-area {
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }
    
    /* Larger touch targets */
    .primary-button,
    .secondary-button {
        min-height: 50px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .upload-section,
    .settings-section,
    .action-buttons,
    .app-footer {
        display: none;
    }
}