/* ============================================
   HEIC → JPG Converter - Premium Dark UI
   ============================================ */

/* Variables */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a26;
    --bg-elevated: #22222e;
    
    /* Accent colors */
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --accent-glow: rgba(99, 102, 241, 0.4);
    
    /* Status colors */
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --info: #3b82f6;
    --info-bg: rgba(59, 130, 246, 0.1);
    
    /* Text colors */
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    
    /* Border colors */
    --border-primary: rgba(255, 255, 255, 0.08);
    --border-secondary: rgba(255, 255, 255, 0.12);
    --border-accent: rgba(99, 102, 241, 0.5);
    
    /* Glassmorphism */
    --glass-bg: rgba(18, 18, 26, 0.8);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-blur: blur(20px);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px var(--accent-glow);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* App Container */
.app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-x: hidden;
}

/* Background effects */
.app::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
                radial-gradient(circle at 70% 80%, rgba(168, 85, 247, 0.06) 0%, transparent 40%);
    pointer-events: none;
    z-index: 0;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: var(--font-size-2xl);
}

.logo h1 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-arrow {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0 var(--spacing-xs);
}

.header-badge {
    display: flex;
    gap: var(--spacing-sm);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: var(--radius-full);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
}

.badge-success {
    background: var(--success-bg);
    border-color: rgba(34, 197, 94, 0.2);
    color: var(--success);
}

.badge-info {
    background: var(--info-bg);
    border-color: rgba(59, 130, 246, 0.2);
    color: var(--info);
}

.badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================================
   Main Content
   ============================================ */
.main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-xl);
    width: 100%;
    position: relative;
    z-index: 1;
}

/* ============================================
   Drop Zone
   ============================================ */
.drop-zone-container {
    margin-bottom: var(--spacing-xl);
}

.drop-zone {
    position: relative;
    border: 2px dashed var(--border-secondary);
    border-radius: var(--radius-2xl);
    background: var(--bg-secondary);
    padding: var(--spacing-2xl) var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    overflow: hidden;
}

.drop-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.drop-zone:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.drop-zone:hover::before {
    opacity: 0.05;
}

.drop-zone.drag-over {
    border-color: var(--accent-secondary);
    border-style: solid;
    transform: scale(1.02);
    box-shadow: var(--shadow-glow);
}

.drop-zone.drag-over::before {
    opacity: 0.1;
}

.drop-zone-content {
    position: relative;
    z-index: 1;
}

.drop-zone-icon {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-base);
}

.drop-zone:hover .drop-zone-icon {
    transform: translateY(-4px);
}

.drop-zone-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.drop-zone-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-lg);
}

.drop-zone-formats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.format-tag {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

/* ============================================
   Controls
   ============================================ */
.controls {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-primary);
}

.control-group {
    flex: 1;
}

.control-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.label-text {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.label-value {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--accent-primary);
}

/* Slider */
.slider {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-gradient);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast);
}

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

/* Toggle Group */
.toggle-group {
    display: flex;
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    padding: 3px;
}

.toggle-btn {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    font-family: inherit;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.toggle-btn.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* ============================================
   File Queue
   ============================================ */
.file-queue-container {
    display: none;
    margin-bottom: var(--spacing-xl);
}

.file-queue-container.visible {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.queue-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.queue-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.queue-count {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.queue-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.file-queue {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* File Item */
.file-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    transition: all var(--transition-fast);
}

.file-item:hover {
    border-color: var(--border-secondary);
}

.file-preview {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    flex-shrink: 0;
}

.file-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.file-preview-placeholder {
    color: var(--text-tertiary);
    font-size: var(--font-size-xl);
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: var(--spacing-xs);
}

.file-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
}

.file-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.status-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
}

.status-pending {
    background: var(--bg-elevated);
    color: var(--text-tertiary);
}

.status-processing {
    background: var(--info-bg);
    color: var(--info);
}

.status-complete {
    background: var(--success-bg);
    color: var(--success);
}

.status-error {
    background: var(--error-bg);
    color: var(--error);
}

/* Progress bar */
.file-progress {
    position: relative;
    width: 100%;
    height: 4px;
    background: var(--bg-elevated);
    border-radius: var(--radius-full);
    margin-top: var(--spacing-sm);
    overflow: hidden;
}

.file-progress-bar {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.file-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-icon {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-icon.btn-download {
    background: var(--success-bg);
    color: var(--success);
}

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

/* ============================================
   Stats
   ============================================ */
.stats {
    display: none;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stats.visible {
    display: grid;
    animation: fadeIn 0.3s ease;
}

.stat-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    border: 1px solid var(--border-primary);
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    border-top: 1px solid var(--border-primary);
    background: var(--bg-secondary);
    position: relative;
    z-index: 1;
}

.footer p {
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--accent-primary);
}

.footer-divider {
    color: var(--border-secondary);
}

/* ============================================
   Loading Overlay
   ============================================ */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    z-index: 1000;
    transition: opacity var(--transition-base);
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--bg-elevated);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .controls {
        flex-direction: column;
    }
    
    .queue-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: stretch;
    }
    
    .queue-actions {
        justify-content: stretch;
    }
    
    .queue-actions .btn {
        flex: 1;
        justify-content: center;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .file-item {
        flex-wrap: wrap;
    }
    
    .file-status {
        width: 100%;
        justify-content: space-between;
        padding-top: var(--spacing-sm);
        border-top: 1px solid var(--border-primary);
    }
}