/* TechHub - Modern E-commerce Design */

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

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --secondary: #0ea5e9;
    --accent: #f59e0b;
    --dark: #1e293b;
    --light: #f8fafc;
    --text: #334155;
    --border: #e2e8f0;
    --success: #10b981;
    --danger: #ef4444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text);
    background: var(--light);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Demo Banner */
.demo-banner {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: white;
    text-align: center;
    padding: 12px 20px;
    font-weight: 600;
    font-size: 14px;
    position: sticky;
    top: 0;
    z-index: 1001;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* Header */
header {
    background: white;
    box-shadow: 0 2px 20px rgba(0,0,0,0.1);
    position: sticky;
    top: 44px;
    z-index: 1000;
}

.navbar {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    white-space: nowrap;
}

.search-bar {
    flex: 1;
    display: flex;
    max-width: 500px;
}

.search-bar input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: 8px 0 0 8px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.search-bar input:focus {
    border-color: var(--primary);
}

.search-bar button {
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0 8px 8px 0;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background 0.3s;
}

.search-bar button:hover {
    background: var(--primary-dark);
}

.cart-btn {
    padding: 0.75rem 1.5rem;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

.cart-btn:hover {
    background: #d97706;
    transform: translateY(-2px);
}

.cart-count {
    background: var(--danger);
    color: white;
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border-radius: 10px;
    margin-left: 0.5rem;
}

/* Cart Sidebar */
.cart-sidebar {
    position: fixed;
    right: -400px;
    top: 0;
    width: 400px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 20px rgba(0,0,0,0.2);
    z-index: 2000;
    transition: right 0.3s ease;
    display: flex;
    flex-direction: column;
}

.cart-sidebar.active {
    right: 0;
}

.cart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 2px solid var(--border);
}

.cart-header h2 {
    font-size: 1.5rem;
    color: var(--dark);
}

.close-btn {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transition: background 0.3s;
}

.close-btn:hover {
    background: var(--light);
}

.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
}

.empty-cart {
    text-align: center;
    color: var(--text);
    padding: 3rem 1rem;
}

.cart-item {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

.cart-item-image {
    width: 80px;
    height: 80px;
    background: var(--light);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.cart-item-details {
    flex: 1;
}

.cart-item-name {
    font-weight: 600;
    color: var(--dark);
}

.cart-item-price {
    color: var(--primary);
    font-weight: 600;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.qty-btn {
    width: 30px;
    height: 30px;
    border: 1px solid var(--border);
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

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

.qty-display {
    padding: 0 0.75rem;
    font-weight: 600;
}

.remove-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1.2rem;
}

.cart-footer {
    padding: 1.5rem;
    border-top: 2px solid var(--border);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.checkout-btn {
    width: 100%;
    padding: 1rem;
    background: var(--success);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.checkout-btn:hover {
    background: #059669;
    transform: translateY(-2px);
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 5rem 2rem;
    text-align: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 800;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-btn {
    padding: 1rem 3rem;
    background: white;
    color: var(--primary);
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
}

.cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

/* Filters */
.filters-section {
    padding: 2rem 0;
    background: white;
}

.filters-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.filters {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: var(--light);
    border: 2px solid var(--border);
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

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

.sort-controls select {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
}

/* Products */
.products-section {
    padding: 3rem 0;
}

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

.product-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.product-image {
    width: 100%;
    height: 250px;
    background: var(--light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    position: relative;
}

.product-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--accent);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 600;
}

.product-info {
    padding: 1.5rem;
}

.product-category {
    color: var(--secondary);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.product-name {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

.product-description {
    color: var(--text);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

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

.product-price {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
}

.add-to-cart-btn {
    padding: 0.75rem 1.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.add-to-cart-btn:hover {
    background: var(--primary-dark);
}

.no-results {
    text-align: center;
    padding: 4rem 2rem;
}

/* Features */
.features {
    padding: 4rem 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature {
    text-align: center;
    padding: 2rem;
}

.feature-icon {
    font-size: 3rem;
}

/* Footer */
footer {
    background: var(--dark);
    color: white;
    text-align: center;
    padding: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
    }
    .hero-content h1 {
        font-size: 2.5rem;
    }
    .cart-sidebar {
        width: 100%;
        right: -100%;
    }
}