/**
 * Custom CSS for Huy Hoàng Duy Jewelry E-commerce
 * Optimized for performance and SEO
 */

/* ========================================
   CSS Variables for Consistent Theming
   ======================================== */
:root {
    --primary-color: #d4af37;
    --primary-dark: #b8941f;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --info-color: #3498db;
    --light-color: #f8f9fa;
    --dark-color: #2c3e50;
    --border-color: #dee2e6;
    --shadow-light: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-medium: 0 4px 8px rgba(0,0,0,0.15);
    --shadow-heavy: 0 8px 16px rgba(0,0,0,0.2);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

/* ========================================
   Base Styles
   ======================================== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #ffffff;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.text-primary {
    color: var(--primary-color) !important;
}

.bg-primary {
    background-color: var(--primary-color) !important;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #ffffff;
}

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

/* ========================================
   Header Styles
   ======================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: #ffffff;
}

.top-bar {
    font-size: 0.875rem;
}

.top-bar a {
    transition: var(--transition);
}

.top-bar a:hover {
    opacity: 0.8;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color) !important;
}

.navbar-nav .nav-link {
    font-weight: 500;
    padding: 0.75rem 1rem !important;
    transition: var(--transition);
    position: relative;
}

.navbar-nav .nav-link:hover {
    color: var(--primary-color) !important;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background-color: var(--primary-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after {
    width: 80%;
}

/* ========================================
   Product Cards
   ======================================== */
.product-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
    background: #ffffff;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.product-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 1;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: var(--accent-color);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    z-index: 2;
}

.product-badge.featured {
    background: var(--primary-color);
}

.product-info {
    padding: 1rem;
}

.product-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
    text-decoration: none;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-title:hover {
    color: var(--primary-color);
    text-decoration: none;
}

.product-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.product-price .original-price {
    text-decoration: line-through;
    color: #6c757d;
    font-size: 0.9rem;
    margin-left: 0.5rem;
}

.product-description {
    color: #6c757d;
    font-size: 0.9rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========================================
   Category Cards
   ======================================== */
.category-card {
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-decoration: none;
    display: block;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
    color: white;
    text-decoration: none;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.3);
    transition: var(--transition);
}

.category-card:hover::before {
    background: rgba(0,0,0,0.1);
}

.category-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1.5rem;
    z-index: 2;
}

.category-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.category-count {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ========================================
   Cart Styles
   ======================================== */
.cart-item {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

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

.cart-item-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: var(--border-radius);
}

.cart-summary {
    background: var(--light-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    position: sticky;
    top: 100px;
}

.cart-total {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
    border-top: 2px solid var(--border-color);
    padding-top: 1rem;
    margin-top: 1rem;
}

/* ========================================
   Floating Contact Button
   ======================================== */
.floating-contact {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
}

.floating-contact .btn {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

/* ========================================
   Footer Styles
   ======================================== */
.footer {
    background: var(--dark-color);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.footer a {
    color: #bdc3c7;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 1rem;
    margin-top: 2rem;
    text-align: center;
    color: #bdc3c7;
}

/* ========================================
   Breadcrumb Styles
   ======================================== */
.breadcrumb {
    background: transparent;
    padding: 0.5rem 0;
}

.breadcrumb-item + .breadcrumb-item::before {
    content: "›";
    color: var(--primary-color);
    font-weight: bold;
}

.breadcrumb-item.active {
    color: var(--primary-color);
}

/* ========================================
   Alert Styles
   ======================================== */
.alert {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--shadow-light);
}

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

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

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

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

/* ========================================
   Form Styles
   ======================================== */
.form-control {
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(212, 175, 55, 0.25);
}

.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
}

/* ========================================
   Loading Spinner
   ======================================== */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .floating-contact {
        bottom: 15px;
        right: 15px;
    }
    
    .floating-contact .btn {
        width: 50px;
        height: 50px;
        font-size: 1.2rem;
    }
    
    .product-card {
        margin-bottom: 1rem;
    }
    
    .cart-summary {
        position: static;
        margin-top: 2rem;
    }
    
    .category-card {
        height: 150px;
    }
    
    .category-content {
        padding: 1rem;
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .floating-contact,
    .navbar,
    .footer,
    .btn {
        display: none !important;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    .container {
        width: 100% !important;
        max-width: none !important;
    }
}

/* ========================================
   Accessibility Improvements
   ======================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000000;
        --primary-dark: #333333;
        --border-color: #000000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-gold {
    color: var(--primary-color) !important;
}

.bg-gold {
    background-color: var(--primary-color) !important;
}

.shadow-custom {
    box-shadow: var(--shadow-medium) !important;
}

.border-gold {
    border-color: var(--primary-color) !important;
}

.hover-lift {
    transition: var(--transition);
}

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

/* Image lazy loading placeholder */
.lazy-image {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

/* ========================================
   Mobile Footer Navigation
   ======================================== */
.mobile-footer-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #ffffff;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    padding-bottom: env(safe-area-inset-bottom);
}

.mobile-nav-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 0.5rem 0;
    max-width: 100%;
}

.mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: #6c757d;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.5rem 0.25rem;
    min-width: 60px;
    transition: var(--transition);
    border-radius: 8px;
}

.mobile-nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
    transition: var(--transition);
}

.mobile-nav-item span {
    font-size: 0.7rem;
    line-height: 1;
    text-align: center;
}

.mobile-nav-item:hover,
.mobile-nav-item.active {
    color: var(--primary-color);
    text-decoration: none;
    background-color: rgba(212, 175, 55, 0.1);
}

.mobile-nav-item:hover i,
.mobile-nav-item.active i {
    transform: scale(1.1);
}

/* Adjust main content padding for mobile footer */
@media (max-width: 991.98px) {
    body {
        padding-bottom: 70px;
    }

    .floating-contact {
        bottom: 85px;
    }
}

/* Hide mobile footer on larger screens */
@media (min-width: 992px) {
    .mobile-footer-nav {
        display: none !important;
    }
}