/* ===================================
   Virtual Try-On - Modern UI Styles
   =================================== */

:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

    --bg-dark: #0f0f1a;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    --border-color: rgba(255, 255, 255, 0.1);
    --border-glow: rgba(102, 126, 234, 0.5);

    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* 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: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* Reset and Base */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Background Effects */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(79, 172, 254, 0.1) 0%, transparent 60%);
    pointer-events: none;
    z-index: -1;
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    background: rgba(15, 15, 26, 0.8);
    border-bottom: 1px solid var(--border-color);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.brand:hover {
    color: var(--text-primary);
    transform: scale(1.02);
}

.brand-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: var(--transition-normal);
}

.nav-link:hover {
    color: var(--text-primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* Main Content */
.main-content {
    flex: 1;
    padding-bottom: var(--spacing-2xl);
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin: 0 0 var(--spacing-md);
    letter-spacing: -0.02em;
}

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

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Try-On Section */
.tryon-section {
    max-width: 900px;
    margin: 0 auto;
}

/* Upload Grid */
.upload-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

@media (max-width: 768px) {
    .upload-grid {
        grid-template-columns: 1fr;
    }
}

/* Multi-Product Upload */
.upload-card-products {
    padding: var(--spacing-lg);
}

.products-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.products-header h3 {
    margin: 0 0 var(--spacing-xs);
    font-size: 1.25rem;
}

.products-header p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.products-container {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.product-upload-item {
    flex: 0 0 auto;
}

.product-zone {
    width: 120px;
    height: 160px;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    position: relative;
    cursor: pointer;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-zone:hover {
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
}

.product-zone.has-image {
    border-style: solid;
    border-color: var(--success);
}

.product-placeholder {
    text-align: center;
    padding: var(--spacing-sm);
}

.product-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.upload-hint-small {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.product-preview {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    display: none;
}

.product-preview.visible {
    display: block;
}

.product-remove-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    font-size: 0.8rem;
}

.add-product-btn {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    background: transparent;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.add-product-btn:hover {
    border-color: var(--border-glow);
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

/* Upload Card */
.upload-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.upload-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glow);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.15);
}

.upload-zone {
    position: relative;
    aspect-ratio: 3/4;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-normal);
    overflow: hidden;
}

.upload-zone.dragover {
    background: rgba(102, 126, 234, 0.1);
    border-color: var(--border-glow);
}

.upload-placeholder {
    text-align: center;
    padding: var(--spacing-xl);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.8;
}

.upload-placeholder h3 {
    margin: 0 0 var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 600;
}

.upload-placeholder p {
    margin: 0 0 var(--spacing-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.upload-hint {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 500;
}

.upload-preview {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: none;
    background: rgba(0, 0, 0, 0.3);
    padding: var(--spacing-sm);
}

.upload-preview.visible {
    display: block;
}

.remove-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.remove-btn:hover {
    background: var(--error);
    transform: scale(1.1);
}

/* Options Section */
.options-section {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
}

.option-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: 500;
}

.sample-select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-fast);
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='white' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.sample-select option {
    background: var(--bg-dark);
    color: var(--text-primary);
    padding: var(--spacing-sm);
}

.sample-select:hover,
.sample-select:focus {
    border-color: var(--border-glow);
    outline: none;
}

/* Action Section */
.action-section {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
}

.generate-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-2xl);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-xl);
    color: white;
    font-family: var(--font-family);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.generate-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
}

.generate-btn:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
}

.generate-btn:not(:disabled):active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.generate-btn:not(:disabled):hover .btn-icon {
    transform: translateX(4px);
}

/* Loading Section */
.loading-section {
    text-align: center;
    padding: var(--spacing-2xl);
}

.loading-spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
    border: 3px solid var(--border-color);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-xs);
}

.loading-subtext {
    color: var(--text-muted);
    margin: 0;
}

/* Error Section */
.error-section {
    text-align: center;
    padding: var(--spacing-2xl);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

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

.error-message {
    color: #fca5a5;
    font-size: 1rem;
    margin: 0 0 var(--spacing-lg);
}

.retry-btn {
    padding: var(--spacing-sm) var(--spacing-xl);
    background: transparent;
    border: 1px solid var(--error);
    border-radius: var(--radius-sm);
    color: var(--error);
    font-family: var(--font-family);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.retry-btn:hover {
    background: var(--error);
    color: white;
}

/* Results Section */
.results-section {
    margin-top: var(--spacing-2xl);
}

.results-title {
    text-align: center;
    font-size: 2rem;
    margin: 0 0 var(--spacing-md);
}

.results-stats {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0 0 var(--spacing-xl);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    display: inline-block;
    width: 100%;
}

.results-stats::before {
    content: '⏱️ ';
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.result-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.result-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.result-image {
    width: 100%;
    aspect-ratio: 3/4;
    object-fit: contain;
    display: block;
    background: rgba(0, 0, 0, 0.3);
}

.result-actions {
    padding: var(--spacing-md);
    display: flex;
    justify-content: center;
}

.download-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
}

.download-btn:hover {
    border-color: var(--border-glow);
    color: var(--text-primary);
    background: var(--bg-card-hover);
}

.new-tryon-btn {
    display: block;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-2xl);
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-xl);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.new-tryon-btn:hover {
    border-color: var(--border-glow);
    background: var(--bg-card);
}

/* Footer */
.app-footer {
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

.app-footer p {
    margin: 0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Utility Classes */
[hidden] {
    display: none !important;
}

/* Lightbox */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
}

.lightbox-content {
    position: relative;
    width: 90vw;
    height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 1;
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    width: 36px;
    height: 36px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.lightbox-close:hover {
    background: var(--error);
    border-color: var(--error);
    transform: scale(1.1);
}

.lightbox-image-container {
    flex: 1;
    width: 100%;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    border-radius: var(--radius-lg);
    background: var(--bg-card);
}

.lightbox-image-container:active {
    cursor: grabbing;
}

.lightbox-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    transition: transform 0.1s ease-out;
    user-select: none;
    -webkit-user-drag: none;
}

.lightbox-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
}

.lightbox-btn {
    width: 40px;
    height: 40px;
    background: var(--bg-card-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-btn:hover {
    background: var(--primary-gradient);
    border-color: transparent;
}

.lightbox-btn:last-child {
    width: auto;
    padding: 0 var(--spacing-md);
    font-size: 0.9rem;
}

.lightbox-zoom-level {
    min-width: 60px;
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
}

.lightbox-hint {
    margin: var(--spacing-sm) 0 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Make result images clickable */
.result-image {
    cursor: zoom-in;
}

/* Lightbox Navigation */
.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 2rem;
    line-height: 1;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.lightbox-nav:hover {
    background: var(--primary-gradient);
    border-color: transparent;
    transform: translateY(-50%) scale(1.1);
}

.lightbox-nav:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.lightbox-nav:disabled:hover {
    background: var(--bg-card);
    border-color: var(--border-color);
    transform: translateY(-50%);
}

.lightbox-prev {
    left: -70px;
}

.lightbox-next {
    right: -70px;
}

@media (max-width: 1200px) {
    .lightbox-prev {
        left: 10px;
    }

    .lightbox-next {
        right: 10px;
    }
}

.lightbox-divider {
    width: 1px;
    height: 20px;
    background: var(--border-color);
    margin: 0 var(--spacing-sm);
}

.lightbox-counter {
    min-width: 50px;
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
}