/* ============================================================
   E-Comm SaaS - Modern Design System v3.1
   Features: CSS Variables, Dark Mode, Animations, Responsive
   ============================================================ */

/* ---- CSS Variables ---- */
:root {
    --primary: #4F46E5;
    --primary-light: #818CF8;
    --primary-dark: #3730A3;
    --secondary: #0EA5E9;
    --accent: #F59E0B;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --info: #3B82F6;
    --dark: #1F2937;
    --darker: #111827;
    --light: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    --white: #FFFFFF;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.25);
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-primary: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-display: 'Poppins', 'Inter', sans-serif;
    --bg-body: #F9FAFB;
    --bg-card: #FFFFFF;
    --bg-nav: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --border-color: #E5E7EB;
}

/* ---- Dark Mode ---- */
.dark-mode {
    --bg-body: #0F172A;
    --bg-card: #1E293B;
    --bg-nav: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border-color: #334155;
    --gray-100: #1E293B;
    --gray-200: #334155;
    --gray-300: #475569;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.3);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.3);
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

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

img {
    max-width: 100%;
    height: auto;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--gray-100);
}
::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* ---- Selection ---- */
::selection {
    background-color: var(--primary);
    color: var(--white);
}

/* ---- Navbar ---- */
.navbar {
    background-color: var(--bg-nav) !important;
    box-shadow: var(--shadow-sm);
    padding: 0.75rem 0;
    transition: var(--transition);
    z-index: 1030;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    padding: 0.5rem 0;
}

.navbar-brand {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary) !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand i {
    font-size: 1.3rem;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.925rem;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary) !important;
    background-color: rgba(79, 70, 229, 0.08);
}

.dropdown-item {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: rgba(79, 70, 229, 0.08);
    color: var(--primary);
}

/* ---- Cart Badge ---- */
.badge-cart {
    position: absolute;
    top: -5px;
    right: -8px;
    font-size: 0.65rem;
    padding: 0.2rem 0.4rem;
    border-radius: 50px;
    animation: badgeBounce 0.4s ease;
    background: linear-gradient(135deg, var(--danger), #DC2626);
    border: 2px solid var(--bg-nav);
}

@keyframes badgeBounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.3); }
}

.wishlist-count {
    background: linear-gradient(135deg, var(--danger), #DC2626) !important;
}

/* ---- Hero Section ---- */
.hero-section {
    background: linear-gradient(135deg, #1E1B4B 0%, #312E81 50%, #4338CA 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
    pointer-events: none;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: rgba(255,255,255,0.03);
    pointer-events: none;
}

.hero-section h1 {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 3rem;
    line-height: 1.15;
}

.hero-section .lead {
    font-size: 1.15rem;
    opacity: 0.9;
}

.min-vh-50 {
    min-height: 50vh;
}

/* ---- Product Cards ---- */
.product-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    background-color: var(--bg-card);
    position: relative;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.product-card .card-img-top {
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-card:hover .card-img-top {
    transform: scale(1.08);
}

.product-card .card-body {
    padding: 1rem;
}

.product-card .card-title {
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.product-card .card-title a {
    color: var(--text-primary);
    transition: var(--transition);
}

.product-card .card-title a:hover {
    color: var(--primary);
}

.product-card .product-actions {
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition);
    background: linear-gradient(transparent, rgba(0,0,0,0.6));
    padding: 0.75rem;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.product-card:hover .product-actions {
    opacity: 1;
    transform: translateY(0);
}

.product-card .product-actions .btn {
    backdrop-filter: blur(10px);
    background: rgba(255,255,255,0.9);
    border: none;
    border-radius: var(--radius);
    transition: var(--transition);
}

.product-card .product-actions .btn:hover {
    background: var(--primary);
    color: var(--white);
    transform: scale(1.1);
}

.product-card .product-actions .btn-primary {
    background: var(--primary);
    color: var(--white);
}

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

/* ---- Category Cards ---- */
.category-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    background-color: var(--bg-card);
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.category-card .card-body {
    padding: 1.5rem 1rem;
}

.category-card .card-title {
    font-size: 0.9rem;
    font-weight: 600;
}

/* ---- Buttons ---- */
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    padding: 0.6rem 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.5s, height 0.5s;
}

.btn-primary:hover::after {
    width: 300px;
    height: 300px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.4);
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
}

.btn-outline-primary {
    border: 2px solid var(--primary);
    color: var(--primary);
    border-radius: var(--radius);
    font-weight: 600;
    transition: var(--transition);
}

.btn-outline-primary:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(79, 70, 229, 0.3);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    transition: var(--transition);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #DC2626);
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    transition: var(--transition);
}

.btn-lg {
    padding: 0.85rem 2rem;
    font-size: 1rem;
}

/* ---- Cards ---- */
.card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow);
}

.card-header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

/* ---- Form Controls ---- */
.form-control {
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    padding: 0.6rem 1rem;
    font-size: 0.95rem;
    transition: var(--transition);
    background-color: var(--bg-card);
    color: var(--text-primary);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
}

.form-control::placeholder {
    color: var(--text-muted);
}

/* ---- Alert/Flash Messages ---- */
.alert {
    border: none;
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    font-weight: 500;
    animation: slideDown 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.alert-success {
    background: linear-gradient(135deg, #D1FAE5, #A7F3D0);
    color: #065F46;
}

.alert-error {
    background: linear-gradient(135deg, #FEE2E2, #FECACA);
    color: #991B1B;
}

.alert-warning {
    background: linear-gradient(135deg, #FEF3C7, #FDE68A);
    color: #92400E;
}

.alert-info {
    background: linear-gradient(135deg, #DBEAFE, #BFDBFE);
    color: #1E40AF;
}

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

/* ---- Breadcrumb ---- */
.breadcrumb {
    background: transparent;
    padding: 0;
    margin: 0;
}

.breadcrumb-item a {
    color: var(--text-secondary);
}

.breadcrumb-item.active {
    color: var(--text-primary);
    font-weight: 600;
}

/* ---- Pagination ---- */
.pagination .page-link {
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    margin: 0 3px;
    padding: 0.5rem 0.85rem;
    transition: var(--transition);
}

.pagination .page-link:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.pagination .page-item.active .page-link {
    background-color: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* ---- Countdown Timer ---- */
.countdown-box .bg-dark {
    background: linear-gradient(135deg, #1E1B4B, #312E81) !important;
    border-radius: var(--radius);
}

.countdown-box span {
    font-family: var(--font-display);
}

/* ---- Footer ---- */
footer {
    background: linear-gradient(180deg, var(--gray-900), var(--darker));
    color: #D1D5DB;
    padding: 4rem 0 2rem;
}

footer h6 {
    color: var(--white);
    font-family: var(--font-display);
    font-weight: 700;
    margin-bottom: 1.25rem;
    font-size: 1rem;
}

footer a {
    color: #D1D5DB;
    transition: var(--transition);
    font-size: 0.9rem;
}

footer a:hover {
    color: var(--primary-light);
    padding-left: 4px;
}

footer .social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    color: #D1D5DB;
    margin-right: 0.5rem;
    transition: var(--transition);
    font-size: 0.85rem;
}

footer .social-links a:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
}

footer .footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1.5rem;
    margin-top: 2rem;
    color: var(--text-muted);
}

/* ---- Dark Mode Toggle ---- */
.dark-mode-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 0.35rem 0.65rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-size: 1rem;
}

.dark-mode-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ---- Toast Notifications ---- */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    max-width: 450px;
    animation: toastSlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 4px solid var(--primary);
}

.toast-item.success { border-left-color: var(--success); }
.toast-item.error { border-left-color: var(--danger); }
.toast-item.warning { border-left-color: var(--warning); }

.toast-item.removing {
    animation: toastSlideOut 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes toastSlideIn {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toastSlideOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(100px); }
}

/* ---- Skeleton Loading ---- */
.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

.dark-mode .skeleton {
    background: linear-gradient(90deg, var(--gray-700) 25%, var(--gray-600) 50%, var(--gray-700) 75%);
    background-size: 200% 100%;
}

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

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-image {
    height: 200px;
}

/* ---- Back to Top ---- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* ---- Product Image Zoom ---- */
.product-images .main-image {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    cursor: zoom-in;
}

.product-images .main-image img {
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-images .main-image:hover img {
    transform: scale(1.15);
}

/* ---- Star Rating ---- */
.star-rating {
    display: flex;
    flex-direction: row-reverse;
    justify-content: flex-end;
}

.star-rating input { display: none; }
.star-rating label {
    cursor: pointer;
    font-size: 1.5rem;
    color: #D1D5DB;
    transition: color 0.2s;
}
.star-rating input:checked ~ label,
.star-rating label:hover,
.star-rating label:hover ~ label { color: #F59E0B; }

/* ---- Section Titles ---- */
.section-title {
    position: relative;
    padding-bottom: 0.75rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
}

/* ---- Responsive ---- */
@media (max-width: 991.98px) {
    .hero-section h1 {
        font-size: 2.25rem;
    }
    
    .navbar-collapse {
        background-color: var(--bg-card);
        padding: 1rem;
        border-radius: var(--radius-md);
        margin-top: 0.5rem;
        box-shadow: var(--shadow-md);
    }
}

@media (max-width: 767.98px) {
    .hero-section h1 {
        font-size: 1.85rem;
    }
    
    .product-card .product-actions {
        opacity: 1;
        transform: translateY(0);
        background: linear-gradient(transparent, rgba(0,0,0,0.5));
    }
    
    .product-card:hover .card-img-top {
        transform: none;
    }
}

@media (max-width: 575.98px) {
    .hero-section {
        text-align: center;
    }
    
    .hero-section h1 {
        font-size: 1.6rem;
    }
}

/* ---- Animations ---- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-fadeIn {
    animation: fadeIn 0.4s ease;
}

/* ---- Tab Styles ---- */
.nav-tabs .nav-link {
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
}

.nav-tabs .nav-link.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: transparent;
}

/* ---- Custom Scroll for Categories ---- */
.category-scroll {
    display: flex;
    overflow-x: auto;
    gap: 1rem;
    padding-bottom: 1rem;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
}

.category-scroll::-webkit-scrollbar {
    height: 4px;
}

.category-scroll > * {
    scroll-snap-align: start;
    flex-shrink: 0;
}

/* ---- Price Tag ---- */
.price-tag {
    font-family: var(--font-display);
    font-weight: 700;
}

.price-tag .original-price {
    text-decoration: line-through;
    color: var(--text-muted);
    font-size: 0.85em;
    font-weight: 400;
}

/* ---- Comparison Table ---- */
.comparison-table th {
    background-color: var(--primary);
    color: var(--white);
    font-weight: 600;
}

.comparison-table td {
    vertical-align: middle;
}

/* ---- Quick View Modal ---- */
.quick-view-modal .modal-body {
    padding: 2rem;
}

/* ---- Responsive Search ---- */
.search-form .input-group {
    max-width: 300px;
}

.search-form .form-control {
    border-right: none;
}

.search-form .btn {
    border: 2px solid var(--border-color);
    border-left: none;
    background: var(--bg-card);
    color: var(--text-secondary);
}

.search-form .form-control:focus + .input-group-append .btn {
    border-color: var(--primary);
    color: var(--primary);
}

/* ---- Checkout Steps ---- */
.checkout-step {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.checkout-step.active {
    color: var(--primary);
    font-weight: 700;
}

.checkout-step .step-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    transition: var(--transition);
}

.checkout-step.active .step-icon {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* ---- Print Styles ---- */
@media print {
    .navbar, footer, .back-to-top, .product-actions, .btn {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card {
        border: 1px solid #ddd;
        box-shadow: none;
    }
}