:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #111827;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius: 0.75rem;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    padding-bottom: 80px;
    /* Space for bottom nav if needed */
}

/* Header */
header {
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo {
    height: 32px;
    width: auto;
    object-fit: contain;
}

.btn-login {
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: background 0.2s;
}

.btn-login:hover {
    background: var(--primary-hover);
}

/* Hero Section */
.hero {
    padding: 2rem 1.5rem;
    text-align: center;
}

.hero h1 {
    font-size: 1.875rem;
    margin-bottom: 0.5rem;
}

.hero p {
    color: var(--text-secondary);
}

/* Footer */
.main-footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
}

/* Categories */
.category-scroll {
    display: flex !important;
    gap: 0.75rem;
    flex-wrap: wrap !important;
    justify-content: center !important;
    padding: 1rem 1.5rem;
}

.cat-pill {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    white-space: nowrap;
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.875rem;
    transition: all 0.2s;
}

.cat-pill.active,
.cat-pill:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Product Grid */
.product-grid {
    display: flex !important;
    gap: 1rem;
    flex-wrap: wrap !important;
    justify-content: center !important;
    padding: 1rem 1.5rem;
}

/* @media (min-width: 640px) { ... } Removed as we use Flexbox now */

.product-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s;
    text-decoration: none;
    color: inherit;
    display: block;
    width: 160px;
    /* Base width */
    flex-grow: 0;
    flex-shrink: 0;
}

@media (min-width: 640px) {
    .product-card {
        width: 220px;
        /* Larger width on desktop */
    }
}

.product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.product-img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    background: #e5e7eb;
}

.product-info {
    padding: 0.75rem;
}

.product-title {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.product-cat {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.product-stock {
    font-size: 0.75rem;
    color: var(--primary-color);
    font-weight: 500;
}

.product-stock.out {
    color: #ef4444;
}

.install-prompt {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    padding: 1rem;
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
    z-index: 100;
    text-align: center;
}

.btn-install {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    max-width: 300px;
}