/* 
 * AI Image Generator Mini App - Styles
 * Premium design with glassmorphism and dark mode
 */

/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
    /* Colors - Premium Palette */
    --primary: #6866FF;
    --primary-dark: #5554CC;
    --primary-light: #8886FF;
    
    --secondary: #FF6B9D;
    --secondary-dark: #E65A8B;
    
    --success: #4CAF50;
    --warning: #FF9800;
    --error: #F44336;
    
    /* Background */
    --bg-primary: #0F0F1E;
    --bg-secondary: #1A1A2E;
    --bg-tertiary: #252541;
    
    /* Glass effect */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    /* Text */
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--spacing-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 600px;
    margin: 0 auto;
}

.header-title {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.token-balance {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-weight: 600;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* ============================================
   Navigation Tabs
   ============================================ */
.tabs {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--glass-border);
    overflow-x: auto;
    scrollbar-width: none;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    flex: 1;
    min-width: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.875rem;
}

.tab:hover {
    background: var(--glass-bg);
    border-color: var(--glass-border);
}

.tab.active {
    background: var(--primary);
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(104, 102, 255, 0.3);
}

.tab-icon {
    font-size: 1.25rem;
}

.tab-label {
    font-size: 0.75rem;
    font-weight: 500;
}

/* ============================================
   Container & Sections
   ============================================ */
.container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-md);
    padding-bottom: var(--spacing-xl);
}

.tab-content {
    display: none;
    animation: fadeIn var(--transition-base);
}

.tab-content.active {
    display: block;
}

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

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

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* ============================================
   Styles Grid
   ============================================ */
.styles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-sm);
}

.style-card {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    border: 2px solid transparent;
}

.style-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.style-card.selected {
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(104, 102, 255, 0.5);
}

.style-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.style-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    padding: var(--spacing-sm);
    transform: translateY(100%);
    transition: transform var(--transition-base);
}

.style-card:hover .style-overlay {
    transform: translateY(0);
}

.style-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.favorite-btn {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform var(--transition-fast);
    z-index: 10;
}

.favorite-btn:hover {
    transform: scale(1.1);
}

.favorite-btn.active {
    background: var(--secondary);
}

/* ============================================
   Upload Area
   ============================================ */
.upload-area {
    position: relative;
    aspect-ratio: 1;
    max-width: 400px;
    margin: 0 auto;
    border: 2px dashed var(--glass-border);
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    cursor: pointer;
    transition: all var(--transition-base);
    overflow: hidden;
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(104, 102, 255, 0.05);
}

.upload-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--spacing-md);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.upload-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

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

/* ============================================
   Buttons
   ============================================ */
.btn-primary, .btn-secondary {
    width: 100%;
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text-primary);
    box-shadow: 0 4px 12px rgba(104, 102, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(104, 102, 255, 0.4);
}

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

.btn-secondary:hover {
    background: var(--glass-border);
}

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

/* ============================================
   Progress
   ============================================ */
.progress-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.progress-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.progress-bar {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 999px;
    transition: width var(--transition-base);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { background-position: -100% 0; }
    100% { background-position: 100% 0; }
}

.progress-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.progress-hint {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* ============================================
   Result & Other Cards
   ============================================ */
.result-card, .invite-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.result-image {
    width: 100%;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.result-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.result-actions .btn-primary {
    grid-column: 1 / -1;
}

/* ============================================
   Invite Card
   ============================================ */
.invite-reward {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: linear-gradient(135deg, rgba(104, 102, 255, 0.1), rgba(255, 107, 157, 0.1));
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.reward-icon {
    font-size: 3rem;
}

.reward-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.reward-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.invite-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.stat-item {
    text-align: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-tertiary);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.5;
}

.empty-text {
    font-size: 1rem;
}

/* ============================================
   History List
   ============================================ */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.history-item {
    display: flex;
    gap: var(--spacing-sm);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-base);
}

.history-item:hover {
    background: var(--glass-border);
    transform: translateX(4px);
}

.history-thumbnail {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.history-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.history-title {
    font-size: 1rem;
    font-weight: 600;
}

.history-date {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.history-status {
    display: inline-block;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.history-status.completed {
    background: rgba(76, 175, 80, 0.2);
    color: var(--success);
}

.history-status.processing {
    background: rgba(255, 152, 0, 0.2);
    color: var(--warning);
}

.history-status.failed {
    background: rgba(244, 67, 54, 0.2);
    color: var(--error);
}

/* ============================================
   Skeleton Loader
   ============================================ */
.skeleton-loader {
    aspect-ratio: 1;
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--glass-bg) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 480px) {
    .styles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .result-actions {
        grid-template-columns: 1fr;
    }
}
.history-image { width: 80px; height: 80px; object-fit: cover; border-radius: 8px; flex-shrink: 0; }