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

:root {
    /* Color Palette */
    --primary-color: #6C63FF;
    --primary-dark: #5548E0;
    --secondary-color: #FF6B9D;
    --success-color: #4CAF50;
    --danger-color: #FF5252;
    --text-primary: #2C3E50;
    --text-secondary: #7F8C8D;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --border-color: #E0E0E0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.15);
    
    /* 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;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

/* ===== App Container ===== */
.app-container {
    max-width: 100%;
    min-height: 100vh;
    position: relative;
}

/* ===== Screen Management ===== */
.screen {
    display: none;
    min-height: 100vh;
    padding: var(--spacing-sm);
    animation: fadeIn var(--transition-normal);
}

#matchingScreen.screen {
    padding: 0;
}

.screen.active {
    display: flex;
    flex-direction: column;
}

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

/* ===== Header ===== */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-md);
}

#matchingScreen .app-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 10;
    margin: 0;
    border-radius: 0;
}

.app-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    flex: 1;
    text-align: center;
}

.progress-indicator {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== Buttons ===== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    touch-action: manipulation;
    user-select: none;
}

.btn:active {
    transform: scale(0.95);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.btn-icon {
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1.25rem;
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

.btn-category {
    flex: 1;
    flex-direction: column;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    min-height: 100px;
}

.btn-category:hover,
.btn-category:active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

.btn-swipe {
    width: 4rem;
    height: 4rem;
    border-radius: 50%;
    font-size: 2rem;
    padding: 0;
    box-shadow: var(--shadow-lg);
}

.btn-reject {
    background: white;
    color: var(--danger-color);
    border: 3px solid var(--danger-color);
}

.btn-accept {
    background: white;
    color: var(--success-color);
    border: 3px solid var(--success-color);
}

/* ===== Welcome Screen ===== */
.welcome-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
    padding: var(--spacing-lg);
}

.app-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* ===== Upload Screen ===== */
.upload-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.upload-area {
    background: var(--bg-primary);
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--primary-color);
    background: rgba(108, 99, 255, 0.05);
}

.upload-icon {
    width: 4rem;
    height: 4rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.upload-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

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

.uploaded-images {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--spacing-sm);
}

.uploaded-image-item {
    position: relative;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.uploaded-image-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.remove-image-btn {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    width: 1.5rem;
    height: 1.5rem;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--danger-color);
    box-shadow: var(--shadow-sm);
}

/* ===== Category Assignment Screen ===== */
.category-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.category-image-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    min-height: 300px;
}

.category-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.category-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===== Matching Screen (Tinder-style) ===== */
.matching-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    padding: 0;
    margin: 0;
}

.matching-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    height: 50vh;
    padding: var(--spacing-sm);
}

.section-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    padding-top: 3.5rem;
}

.card-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: 0;
    padding: var(--spacing-sm) 0;
}

.swipe-card {
    position: relative;
    width: 90%;
    max-width: 400px;
    height: 100%;
    max-height: calc(50vh - 120px);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: transform var(--transition-fast);
}

.swipe-card.swipeable {
    cursor: grab;
    touch-action: none;
}

.swipe-card.swipeable:active {
    cursor: grabbing;
}

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

.card-category {
    position: absolute;
    bottom: var(--spacing-sm);
    left: var(--spacing-sm);
    right: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    text-align: center;
    text-transform: none;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.swipe-indicator {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 4rem;
    font-weight: bold;
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}

.swipe-indicator.left {
    left: var(--spacing-lg);
    color: var(--danger-color);
}

.swipe-indicator.right {
    right: var(--spacing-lg);
    color: var(--success-color);
}

.swipe-card.swiping-left .swipe-indicator.left,
.swipe-card.swiping-right .swipe-indicator.right {
    opacity: 1;
}

.matching-divider {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    z-index: 5;
    box-shadow: var(--shadow-sm);
}

.swipe-buttons {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    z-index: 10;
}

/* ===== Gallery Screen ===== */
.gallery-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    background: var(--bg-primary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.gallery-item {
    position: relative;
    aspect-ratio: 3/4;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.gallery-item:active {
    transform: scale(0.95);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gallery-item-category {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: var(--spacing-xs);
    font-size: 0.75rem;
    font-weight: 600;
    text-align: center;
    text-transform: capitalize;
}

.gallery-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: auto;
    padding-top: var(--spacing-md);
}

/* ===== Detail Screen ===== */
.detail-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.detail-image-wrapper {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

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

.detail-category-badge {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: capitalize;
}

.detail-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.detail-section h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.outfit-combinations {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.outfit-combo {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.outfit-combo-item {
    flex: 1;
    aspect-ratio: 3/4;
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
}

.outfit-combo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.outfit-combo-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 0.25rem;
    font-size: 0.625rem;
    text-align: center;
    text-transform: capitalize;
}

.no-combinations {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-lg);
}

/* ===== Recommendation Screen ===== */
.recommendation-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.recommended-outfit {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.recommended-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.recommended-item-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: capitalize;
}

.recommended-item-image {
    width: 100%;
    aspect-ratio: 3/4;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.recommended-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.no-recommendation {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-xl);
}

.no-recommendation-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transition: bottom var(--transition-normal);
    max-width: 90%;
    text-align: center;
}

.toast.show {
    bottom: var(--spacing-lg);
}

/* ===== Responsive Design ===== */
@media (min-width: 768px) {
    .app-container {
        max-width: 768px;
        margin: 0 auto;
    }
    
    .screen {
        padding: var(--spacing-lg);
    }
    
    .app-title {
        font-size: 4rem;
    }
    
    .uploaded-images {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }
    
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    }
    
    .gallery-actions {
        flex-direction: row;
    }
    
    .recommended-outfit {
        flex-direction: row;
    }
    
    .recommended-item {
        flex: 1;
    }
}

@media (min-width: 1024px) {
    .app-container {
        max-width: 1024px;
    }
    
    .matching-container {
        flex-direction: column;
    }
    
    .matching-section {
        height: 50vh;
    }
    
    .swipe-card {
        max-width: 500px;
    }
}

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

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

.mt-auto {
    margin-top: auto;
}

/* ===== Loading State ===== */
.loading {
    pointer-events: none;
    opacity: 0.6;
}

/* ===== Empty State ===== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-secondary);
    min-height: 200px;
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.empty-state-text {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.empty-state-subtext {
    font-size: 0.875rem;
}