/* CSS Variables */
:root {
    --bg-color: #f8f9fa;
    --primary-color: #1f3c88;
    --accent-color: #2ecc71;
    --text-color: #333;
    --text-light: #666;
    --white: #fff;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.2);
    --shadow-deep: 0 10px 30px rgba(0, 0, 0, 0.15);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3 {
    font-weight: 600;
    margin-bottom: 20px;
}

p {
    margin-bottom: 10px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

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

.btn-primary:hover {
    background-color: #172c5f;
    transform: translateY(-2px);
    box-shadow: var(--shadow-deep);
}

.btn-accent {
    background-color: var(--accent-color);
    color: var(--white);
}

.btn-accent:hover {
    background-color: #27ae60;
    transform: translateY(-2px);
    box-shadow: var(--shadow-deep);
}

.btn-danger {
    background-color: #e74c3c;
    color: var(--white);
}

.btn-danger:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
}

/* Navbar */
.navbar {
    background-color: var(--white);
    box-shadow: 0 2px 10px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: var(--transition);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar:hover {
    box-shadow: 0 4px 20px var(--shadow);
}

.nav-brand {
    display: flex;
    align-items: flex-start;
    gap: 15px;
}

.logo {
    height: 40px;
    width: auto;
    max-width: 50px;
    object-fit: contain;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.05);
}

.nav-brand a {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.nav-brand a:hover {
    color: var(--accent-color);
}

.nav-links-center {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-links-center a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding-bottom: 5px;
    border-bottom: 2px solid transparent;
}

.nav-links-center a:hover {
    color: var(--primary-color);
    border-bottom-color: var(--accent-color);
}

.nav-links-right {
    display: flex;
    list-style: none;
}

.cart-link {
    position: relative;
}

.cart-count {
    background-color: var(--accent-color);
    color: var(--white);
    border-radius: 50%;
    padding: 3px 7px;
    font-size: 12px;
    font-weight: 700;
    position: absolute;
    top: -10px;
    right: -15px;
    animation: pulse 0.5s ease;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

/* Hero Section */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-color), #2c5282);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--white);
    padding: 120px 0;
    text-align: center;
    overflow: hidden;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(31, 60, 136, 0.7);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    animation: fadeInUp 0.8s ease;
}

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

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-content p {
    font-size: 20px;
    font-weight: 300;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

/* Search Section */
.search-section {
    padding: 40px 0;
    text-align: center;
}

.search-form {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
    max-width: 800px;
    margin: 0 auto;
}

.search-form input,
.search-form select {
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: var(--border-radius);
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    flex: 1;
    min-width: 200px;
    transition: var(--transition);
}

.search-form input:focus,
.search-form select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(31, 60, 136, 0.1);
}

/* Alerts */
.alerts {
    margin-bottom: 30px;
}

.alert {
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 10px;
    text-align: center;
    font-weight: 500;
    border-left: 4px solid;
    animation: slideIn 0.3s ease;
}

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-color: #28a745;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-color: #17a2b8;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #dc3545;
}

/* Product Grid */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.product-card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-deep);
}

.product-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: var(--transition);
    background-color: var(--bg-color);
}

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

.product-card img[alt]::after {
    content: attr(alt);
}

.card-body {
    padding: 25px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-name {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-color);
}

.product-category {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.product-price {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: auto;
    margin-top: 15px;
}

.product-card .btn {
    margin-top: 20px;
    width: 100%;
    text-align: center;
}

/* Cart */
.cart-table-container {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-deep);
    overflow: hidden;
    margin-bottom: 30px;
}

.cart-table {
    width: 100%;
    border-collapse: collapse;
}

.cart-table th,
.cart-table td {
    padding: 20px;
    text-align: left;
    border-bottom: 1px solid #e1e5e9;
}

.cart-table th {
    background: linear-gradient(135deg, var(--primary-color), #2c5282);
    color: var(--white);
    font-weight: 600;
}

.cart-table tr:hover {
    background-color: var(--bg-color);
}

.cart-total {
    text-align: right;
    padding: 30px;
    background-color: var(--bg-color);
    border-top: 1px solid #e1e5e9;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-total h3 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 0;
}

.empty-cart {
    text-align: center;
    padding: 80px 20px;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-deep);
}

.empty-cart p {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 30px;
}

.empty-cart a {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
}

/* Checkout */
.checkout-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.order-summary {
    background-color: var(--white);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-deep);
}

.order-summary h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

.total-amount {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent-color);
    padding: 20px;
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    text-align: center;
}

.checkout-form {
    background-color: var(--white);
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-deep);
}

.checkout-form h3 {
    margin-bottom: 25px;
    color: var(--primary-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e1e5e9;
    border-radius: var(--border-radius);
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(31, 60, 136, 0.1);
}

/* Footer */
.footer {
    background: linear-gradient(135deg, var(--text-color), #222);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
    margin-top: 60px;
}

.footer p {
    margin: 0;
    font-weight: 300;
}

/* No Products */
.no-products {
    text-align: center;
    font-size: 18px;
    color: var(--text-light);
    padding: 80px 20px;
    background-color: var(--white);
    border-radius: var(--border-radius);
}

/* Responsive */
@media (max-width: 768px) {
    .navbar .container {
        padding: 12px 20px;
    }

    .nav-brand {
        gap: 10px;
    }

    .logo {
        height: 35px;
    }

    .nav-brand a {
        font-size: 18px;
    }

    .nav-links-center {
        gap: 20px;
        font-size: 14px;
    }

    .hero {
        padding: 80px 0;
        min-height: 300px;
    }

    .hero-content h1 {
        font-size: 36px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .search-form {
        flex-direction: column;
        align-items: stretch;
    }

    .search-form input,
    .search-form select,
    .search-form button {
        min-width: auto;
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .checkout-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .cart-table-container {
        overflow-x: auto;
    }

    .cart-table {
        min-width: 600px;
        font-size: 14px;
    }

    .cart-table th,
    .cart-table td {
        padding: 12px;
    }

    .cart-total {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .order-summary,
    .checkout-form {
        padding: 25px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .navbar .container {
        padding: 10px 15px;
    }

    .nav-brand a {
        font-size: 16px;
    }

    .nav-links-center {
        gap: 15px;
        font-size: 12px;
    }

    .logo {
        height: 30px;
    }

    .hero {
        padding: 60px 0;
        min-height: 250px;
    }

    .hero-content h1 {
        font-size: 24px;
    }

    .hero-content p {
        font-size: 14px;
    }

    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .product-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .product-card img {
        height: 200px;
    }

    .card-body {
        padding: 20px;
    }

    .product-name {
        font-size: 18px;
    }

    .product-price {
        font-size: 20px;
    }

    .cart-table {
        font-size: 12px;
    }

    .cart-table th,
    .cart-table td {
        padding: 8px;
    }

    .order-summary,
    .checkout-form {
        padding: 20px;
    }

    .checkout-form h3,
    .order-summary h3 {
        font-size: 18px;
    }

    .total-amount {
        font-size: 24px;
    }
}