/* styles.css - Complete Enhanced Professional Styles */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    background: linear-gradient(45deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.user-info {
    display: none;
    align-items: center;
    gap: 1rem;
}

.user-info.logged-in {
    display: flex;
}

.auth-buttons {
    display: flex;
    gap: 0.5rem;
}

.auth-buttons.hidden {
    display: none;
}

.cart-icon {
    position: relative;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

.cart-icon:hover {
    background-color: rgba(102, 126, 234, 0.1);
}

.cart-count {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #ff4757;
    color: white;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* Buttons */
.btn {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    margin: 0 0.25rem;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    font-size: 0.9rem;
    font-weight: 500;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary {
    background: linear-gradient(45deg, #ff6b6b, #ee5a24);
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: linear-gradient(45deg, #6c757d, #5a6268);
    color: white;
}

.btn-success {
    background: linear-gradient(45deg, #28a745, #20c997);
    color: white;
}

.btn-warning {
    background: linear-gradient(45deg, #ffc107, #fd7e14);
    color: #212529;
}

.btn-danger {
    background: linear-gradient(45deg, #dc3545, #e83e8c);
    color: white;
}

.btn-info {
    background: linear-gradient(45deg, #17a2b8, #20c997);
    color: white;
}

.btn-light {
    background: linear-gradient(45deg, #f8f9fa, #e9ecef);
    color: #212529;
    border: 1px solid #dee2e6;
}

.btn-dark {
    background: linear-gradient(45deg, #343a40, #495057);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn-large {
    padding: 15px 30px;
    font-size: 1.1rem;
}

.btn-full-width {
    width: 100%;
}

.btn-rounded {
    border-radius: 50px;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 20px 40px;
}

.page {
    display: none;
}

.page.active {
    display: block;
}

/* Homepage */
.hero {
    text-align: center;
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 3.5rem;
    color: white;
    margin-bottom: 1rem;
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    font-weight: 700;
}

.hero p {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: #333;
    font-weight: 600;
}

.feature-card p {
    color: #666;
}

/* Camera Page */
.camera-container {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: 15px;
    max-width: 1000px;
    margin: 0 auto;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.camera-container h2 {
    margin-bottom: 1rem;
    color: #333;
    font-weight: 600;
}

.video-container {
    position: relative;
    display: inline-block;
    border-radius: 15px;
    overflow: hidden;
    margin-bottom: 2rem;
    background: #000;
}

#inputVideo {
    width: 100%;
    max-width: 640px;
    height: auto;
    display: block;
    border-radius: 15px;
    transform: scaleX(-1);
}

#outputCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: scaleX(-1);
}

.camera-placeholder {
    width: 640px;
    height: 480px;
    max-width: 100%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    border-radius: 15px;
    margin: 0 auto;
}

.camera-controls {
    margin: 1rem 0;
}

.control-panel {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    align-items: center;
    margin: 2rem 0;
    padding: 1.5rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
}

.landmarks-toggle label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    color: #333;
}

.landmarks-toggle input[type="checkbox"] {
    transform: scale(1.2);
    accent-color: #667eea;
}

.intensity-control {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: #333;
    font-weight: 500;
}

.intensity-slider {
    width: 200px;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
    accent-color: #667eea;
}

#intensityValue {
    min-width: 40px;
    font-weight: bold;
    color: #667eea;
}

.filter-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin: 2rem 0;
}

.filter-btn {
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
    padding: 12px 24px;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    min-width: 120px;
}

.filter-btn:hover {
    background: #f0f8ff;
    transform: translateY(-2px);
}

.filter-btn.active {
    background: #667eea;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.action-buttons {
    margin: 2rem 0;
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Analysis Section */
.analysis-section {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
    margin: 2rem 0;
    text-align: left;
}

.analysis-section h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: #333;
    font-weight: 600;
}

.skin-analysis {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.skin-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.skin-card:hover {
    transform: translateY(-2px);
}

.skin-card h4 {
    margin-bottom: 1rem;
    color: #333;
    font-weight: 600;
}

.skin-color-preview {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    margin: 0 auto 1rem;
    border: 3px solid #fff;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.confidence-bar {
    background: #e0e0e0;
    border-radius: 10px;
    height: 8px;
    margin: 8px 0;
    overflow: hidden;
}

.confidence-fill {
    height: 100%;
    background: linear-gradient(90deg, #ff6b6b, #feca57, #48dbfb, #0abde3);
    border-radius: 10px;
    transition: width 0.3s ease;
}

/* Budget Section */
.budget-section {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin: 2rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.budget-section h3 {
    margin-bottom: 1rem;
    color: #333;
    font-weight: 600;
}

.budget-range {
    width: 100%;
    max-width: 300px;
    margin: 1rem 0;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
    accent-color: #667eea;
}

/* Product Recommendations */
.recommendations {
    margin-top: 2rem;
    display: none;
}

.recommendations h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
    font-weight: 600;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.product-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.product-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: white;
}

.product-info {
    padding: 1.5rem;
}

.product-info h4 {
    margin-bottom: 0.5rem;
    color: #333;
    font-weight: 600;
}

.product-info p {
    color: #666;
    margin-bottom: 0.5rem;
}

.product-rating {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0.5rem 0;
}

.stars {
    display: flex;
    gap: 2px;
}

.star {
    width: 16px;
    height: 16px;
    background: #ddd;
    clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
}

.star.filled {
    background: #ffd700;
}

.star.half-filled {
    background: linear-gradient(90deg, #ffd700 50%, #ddd 50%);
}

.match-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: bold;
    display: inline-block;
    margin: 0.5rem 0;
}

.match-badge.match-excellent {
    background: #e8f5e8;
    color: #2d5a2d;
}

.match-badge.match-great {
    background: #e3f2fd;
    color: #1565c0;
}

.match-badge.match-good {
    background: #fff3e0;
    color: #ef6c00;
}

.match-badge.match-fair {
    background: #fce4ec;
    color: #c2185b;
}

.price-category {
    font-size: 0.8rem;
    color: #666;
    font-style: italic;
    margin: 0.25rem 0;
}

/* Status Messages */
.status-message {
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    font-weight: 500;
}

.status-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.status-warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

.status-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

.status-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    max-width: 400px;
    margin: 0 20px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.modal-content h3 {
    margin-bottom: 1.5rem;
    color: #333;
    text-align: center;
    font-weight: 600;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: #333;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.form-buttons {
    margin-top: 1.5rem;
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

.modal-link {
    margin-top: 1rem;
    text-align: center;
}

.modal-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.modal-link a:hover {
    text-decoration: underline;
}

/* Enhanced Form Styles */
.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.form-group-inline {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.form-group-inline label {
    margin-bottom: 0;
    min-width: fit-content;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: white;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
    background-color: #fafbfc;
}

.form-control:disabled {
    background-color: #f8f9fa;
    opacity: 0.6;
    cursor: not-allowed;
}

.form-control.is-invalid {
    border-color: #dc3545;
    box-shadow: 0 0 0 2px rgba(220, 53, 69, 0.2);
}

.form-control.is-valid {
    border-color: #28a745;
    box-shadow: 0 0 0 2px rgba(40, 167, 69, 0.2);
}

.form-text {
    font-size: 0.875rem;
    color: #6c757d;
    margin-top: 0.25rem;
}

.form-error {
    font-size: 0.875rem;
    color: #dc3545;
    margin-top: 0.25rem;
}

.form-success {
    font-size: 0.875rem;
    color: #28a745;
    margin-top: 0.25rem;
}

/* Enhanced Card Styles */
.card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card-header {
    padding: 1.5rem;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1rem 1.5rem;
    background: #f8f9fa;
    border-top: 1px solid #dee2e6;
}

.card-title {
    margin-bottom: 1rem;
    color: #333;
    font-weight: 600;
}

.card-text {
    color: #666;
    line-height: 1.6;
}

.card-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.card-link:hover {
    text-decoration: underline;
}

/* Enhanced Alert Styles */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
    font-weight: 500;
    border: 1px solid transparent;
    position: relative;
}

.alert-primary {
    background: #cce7ff;
    color: #004085;
    border-color: #b3d7ff;
}

.alert-secondary {
    background: #e2e3e5;
    color: #383d41;
    border-color: #d6d8db;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}

.alert-danger {
    background: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border-color: #ffeaa7;
}

.alert-info {
    background: #d1ecf1;
    color: #0c5460;
    border-color: #bee5eb;
}

.alert-light {
    background: #fefefe;
    color: #818182;
    border-color: #fdfdfe;
}

.alert-dark {
    background: #d6d8d9;
    color: #1b1e21;
    border-color: #c6c8ca;
}

.alert-dismissible {
    padding-right: 3rem;
}

.alert-dismissible .close {
    position: absolute;
    top: 50%;
    right: 1rem;
    transform: translateY(-50%);
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
}

.alert-dismissible .close:hover {
    opacity: 1;
}

/* Enhanced Badge Styles */
.badge {
    display: inline-block;
    padding: 0.25em 0.5em;
    font-size: 0.75em;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 0.375rem;
}

.badge-primary {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
}

.badge-secondary {
    background: #6c757d;
    color: white;
}

.badge-success {
    background: #28a745;
    color: white;
}

.badge-danger {
    background: #dc3545;
    color: white;
}

.badge-warning {
    background: #ffc107;
    color: #212529;
}

.badge-info {
    background: #17a2b8;
    color: white;
}

.badge-light {
    background: #f8f9fa;
    color: #212529;
}

.badge-dark {
    background: #343a40;
    color: white;
}

.badge-pill {
    border-radius: 10rem;
}

/* Enhanced Progress Bars */
.progress {
    display: flex;
    height: 1rem;
    overflow: hidden;
    background-color: #e9ecef;
    border-radius: 0.375rem;
}

.progress-bar {
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: white;
    text-align: center;
    white-space: nowrap;
    background: linear-gradient(45deg, #667eea, #764ba2);
    transition: width 0.6s ease;
}

.progress-bar-striped {
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.15) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.15) 75%,
        transparent 75%,
        transparent
    );
    background-size: 1rem 1rem;
}

.progress-bar-animated {
    animation: progress-bar-stripes 1s linear infinite;
}

@keyframes progress-bar-stripes {
    0% {
        background-position: 1rem 0;
    }
    100% {
        background-position: 0 0;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

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

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flex-wrap {
    flex-wrap: wrap;
}

.gap-small {
    gap: 0.5rem;
}

.gap-medium {
    gap: 1rem;
}

.gap-large {
    gap: 2rem;
}

.margin-top-small {
    margin-top: 0.5rem;
}

.margin-top-medium {
    margin-top: 1rem;
}

.margin-top-large {
    margin-top: 2rem;
}

.margin-bottom-small {
    margin-bottom: 0.5rem;
}

.margin-bottom-medium {
    margin-bottom: 1rem;
}

.margin-bottom-large {
    margin-bottom: 2rem;
}

.padding-small {
    padding: 0.5rem;
}

.padding-medium {
    padding: 1rem;
}

.padding-large {
    padding: 2rem;
}

/* Enhanced Tooltip Styles */
.tooltip {
    position: relative;
    cursor: help;
}

.tooltip::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 1000;
}

.tooltip::after {
    content: '';
    position: absolute;
    bottom: 115%;
    left: 50%;
    transform: translateX(-50%);
    border: 5px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.9);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.tooltip:hover::before,
.tooltip:hover::after {
    opacity: 1;
}

/* Enhanced Dropdown Styles */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    background: white;
    border: 1px solid #ddd;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-width: 150px;
}

.dropdown-toggle:hover {
    background: #f8f9fa;
}

.dropdown-toggle::after {
    content: '▼';
    font-size: 0.8rem;
    margin-left: 0.5rem;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    max-height: 200px;
    overflow-y: auto;
    display: none;
}

.dropdown.active .dropdown-menu {
    display: block;
}

.dropdown-item {
    padding: 0.75rem 1rem;
    cursor: pointer;
    border-bottom: 1px solid #f8f9fa;
    transition: background-color 0.3s ease;
}

.dropdown-item:hover {
    background: #f8f9fa;
}

.dropdown-item:last-child {
    border-bottom: none;
}

/* Enhanced Tab Styles */
.tabs {
    border-bottom: 1px solid #dee2e6;
    margin-bottom: 2rem;
}

.tab-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.tab-item {
    margin-right: 0.5rem;
}

.tab-link {
    display: block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    color: #6c757d;
    border: 1px solid transparent;
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    transition: all 0.3s ease;
}

.tab-link:hover {
    color: #667eea;
    background: #f8f9fa;
}

.tab-link.active {
    color: #667eea;
    background: white;
    border-color: #dee2e6;
    border-bottom-color: white;
    margin-bottom: -1px;
}

.tab-content {
    padding: 2rem 0;
}

.tab-pane {
    display: none;
}

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

/* Enhanced List Styles */
.list-group {
    list-style: none;
    padding: 0;
    margin: 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.list-group-item {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #f8f9fa;
    transition: background-color 0.3s ease;
}

.list-group-item:hover {
    background: #f8f9fa;
}

.list-group-item:last-child {
    border-bottom: none;
}

.list-group-item.active {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
}

.list-group-item-action {
    cursor: pointer;
}

/* Enhanced Navigation Pills */
.nav-pills {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 0.5rem;
}

.nav-pill {
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: #6c757d;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-pill:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

.nav-pill.active {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
}

/* Enhanced Breadcrumb */
.breadcrumb {
    display: flex;
    list-style: none;
    padding: 0.75rem 1rem;
    margin: 0;
    background: #f8f9fa;
    border-radius: 8px;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: '/';
    margin: 0 0.5rem;
    color: #6c757d;
}

.breadcrumb-item a {
    color: #667eea;
    text-decoration: none;
}

.breadcrumb-item a:hover {
    text-decoration: underline;
}

.breadcrumb-item.active {
    color: #6c757d;
}

/* Enhanced Pagination */
.pagination {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    justify-content: center;
    gap: 0.25rem;
}

.page-item {
    display: flex;
}

.page-link {
    padding: 0.5rem 0.75rem;
    text-decoration: none;
    color: #667eea;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.page-link:hover {
    background: #f8f9fa;
    color: #495057;
}

.page-item.active .page-link {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border-color: #667eea;
}

.page-item.disabled .page-link {
    color: #6c757d;
    pointer-events: none;
    background: #f8f9fa;
}

/* Enhanced Spinner */
.spinner {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    border: 0.25em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border 0.75s linear infinite;
}

.spinner-small {
    width: 1rem;
    height: 1rem;
    border-width: 0.2em;
}

.spinner-large {
    width: 3rem;
    height: 3rem;
    border-width: 0.3em;
}

@keyframes spinner-border {
    to {
        transform: rotate(360deg);
    }
}

/* Enhanced Accordion */
.accordion {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.accordion-item {
    border-bottom: 1px solid #dee2e6;
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    margin: 0;
}

.accordion-button {
    width: 100%;
    padding: 1rem 1.5rem;
    background: white;
    border: none;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.accordion-button:hover {
    background: #f8f9fa;
}

.accordion-button.collapsed::after {
    content: '+';
    font-size: 1.2rem;
    font-weight: bold;
}

.accordion-button:not(.collapsed)::after {
    content: '−';
    font-size: 1.2rem;
    font-weight: bold;
}

.accordion-collapse {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.accordion-collapse.show {
    max-height: 500px;
}

.accordion-body {
    padding: 1rem 1.5rem;
    background: #f8f9fa;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .navbar {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-controls {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .container {
        padding: 140px 15px 20px;
    }
    
    .camera-placeholder {
        width: 100%;
        height: 300px;
        font-size: 1.5rem;
    }
    
    .control-panel {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .filter-controls {
        flex-direction: column;
        align-items: center;
    }

    .filter-btn {
        width: 100%;
        max-width: 200px;
    }

    .action-buttons {
        flex-direction: column;
        align-items: center;
    }

    .action-buttons .btn {
        width: 100%;
        max-width: 250px;
    }

    .modal-content {
        margin: 1rem;
        max-width: calc(100% - 2rem);
        padding: 1.5rem;
    }

    .form-buttons {
        flex-direction: column;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .skin-analysis {
        grid-template-columns: 1fr;
    }

    .product-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .navbar {
        padding: 0.5rem;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    
    .camera-container {
        padding: 1rem;
    }
    
    .camera-placeholder {
        height: 250px;
        font-size: 1.2rem;
    }
    
    .intensity-control {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .intensity-slider {
        width: 150px;
    }
}

/* Animation Enhancements */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.page.active {
    animation: fadeIn 0.5s ease-out;
}

.feature-card {
    animation: slideIn 0.5s ease-out;
}

.feature-card:nth-child(2) {
    animation-delay: 0.1s;
}

.feature-card:nth-child(3) {
    animation-delay: 0.2s;
}

.feature-card:nth-child(4) {
    animation-delay: 0.3s;
}

.feature-card:nth-child(5) {
    animation-delay: 0.4s;
}

.feature-card:nth-child(6) {
    animation-delay: 0.5s;
}

.product-card {
    animation: fadeIn 0.5s ease-out;
}

.btn-primary:hover {
    animation: pulse 0.3s ease-in-out;
}

/* Accessibility Improvements */
.btn:focus,
.filter-btn:focus,
input:focus,
.cart-icon:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

.landmarks-toggle input:focus {
    outline: 2px solid #667eea;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn {
        border: 2px solid currentColor;
    }
    
    .feature-card {
        border: 1px solid #333;
    }
    
    .product-card {
        border: 1px solid #333;
    }
}

/* Reduced motion support */
@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 {
    .navbar,
    .camera-container,
    .modal {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .hero h1 {
        color: black;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(45deg, #667eea, #764ba2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(45deg, #5a6fd8, #6a42a0);
}

/* Selection Styling */
::selection {
    background: rgba(102, 126, 234, 0.3);
    color: #333;
}

::-moz-selection {
    background: rgba(102, 126, 234, 0.3);
    color: #333;
}

/* Dark mode support (future enhancement) */
@media (prefers-color-scheme: dark) {
    /* Dark mode styles could be added here if needed */
}