:root {
    /* Minimalist Palette */
    --color-bg: #ffffff;
    --color-text-main: #111111;
    --color-text-secondary: #757575;
    --color-border: #e5e5e5;
    --color-accent: #000000;
    --color-accent-text: #ffffff;
    --color-hover: #f9f9f9;

    /* Spacing System */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 64px;

    /* Typography */
    --font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
        sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

button,
input {
    font-family: inherit;
}

/* Layout Containers */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header & Navigation */
header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg); /* Ensure opacity over content */
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
}

.nav-bar {
    height: 80px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--color-text-secondary);
}

/* Hierarchical Navigation (Breadcrumbs) - Req #6 */
.breadcrumbs {
    padding: var(--spacing-md) 0;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

/* Shopping List Interaction - Req #4 */
.cart-wrapper {
    border: 0;
    position: relative;
    padding: var(--spacing-sm) 0;
}

.cart-wrapper > summary {
    list-style: none;
    cursor: pointer;
}

.cart-wrapper > summary::-webkit-details-marker {
    display: none;
}

.cart-icon {
    font-weight: 600;
    border-bottom: 2px solid transparent;
}

.cart-wrapper:hover .cart-icon {
    border-bottom: 2px solid var(--color-accent);
}

/* The Dropdown List */
.shopping-list {
    display: none; /* Hidden by default */
    position: absolute;
    top: 100%;
    right: 0;
    width: 350px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
    z-index: 2000; /* Req #4: Covers elements behind */
}

/* Interaction: click-to-toggle via <details>, plus hover on pointer devices */
.cart-wrapper[open] .shopping-list {
    display: block;
}

@media (hover: hover) {
    .cart-wrapper:hover .shopping-list {
        display: block;
    }
}

.cart-title {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.cart-item-info {
    font-size: 0.9rem;
}

.cart-item-qty input {
    width: 40px;
    padding: 4px;
    text-align: center;
    border: 1px solid var(--color-border);
}

.btn-checkout {
    display: block;
    width: 100%;
    padding: var(--spacing-md);
    background-color: var(--color-accent);
    color: var(--color-accent-text);
    border: none;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 1px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-checkout:hover {
    opacity: 0.8;
}

/* Main Page: Product Grid - Req #3 */
.hero-section {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-sm);
}

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

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 60px 40px; /* Vertical gap larger for breathing room */
    padding-bottom: var(--spacing-xl);
}

.category-block {
    scroll-margin-top: 100px;
    padding-bottom: var(--spacing-xl);
}

.category-header {
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.category-title {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.2px;
}

.category-subtitle {
    margin-top: 6px;
    color: var(--color-text-secondary);
    max-width: 70ch;
}

.product-card {
    display: flex;
    flex-direction: column;
}

.product-image-container {
    background-color: var(
        --color-hover
    ); /* Very subtle grey background for image area */
    aspect-ratio: 1 / 1;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    position: relative;
    overflow: hidden;
}

.product-image-container img {
    width: 80%;
    height: auto;
    transition: transform 0.4s ease;
}

/* Interaction: Zoom on hover */
.product-card:hover .product-image-container img {
    transform: scale(1.05);
}

.product-info {
    text-align: left;
}

.product-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.product-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
    display: block;
}

.product-price {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.btn-add-grid {
    background: transparent;
    border: 1px solid var(--color-border);
    padding: 8px 16px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-add-grid:hover {
    border-color: var(--color-accent);
    background-color: var(--color-accent);
    color: var(--color-accent-text);
}

/* Product Page: Details - Req #5 */
.product-detail-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    align-items: start;
}

.detail-image-wrapper {
    background-color: var(--color-hover);
    padding: var(--spacing-xl);
    display: flex;
    justify-content: center;
}

.detail-content {
    padding-top: var(--spacing-lg);
}

.detail-category {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--color-text-secondary);
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.detail-title {
    font-size: 2.5rem;
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.detail-price {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.detail-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 90%;
}

.detail-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.more-views {
    margin-top: 40px;
    border-top: 1px solid var(--color-border);
    padding-top: 20px;
}

.more-views-label {
    color: #999;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.75rem;
}

.more-views-thumbs {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.more-views-thumb {
    width: 60px;
    height: 60px;
    background: var(--color-hover);
    border: 1px solid transparent;
}

.more-views-thumb--active {
    border-color: var(--color-accent);
}

.btn-add-main {
    background-color: var(--color-accent);
    color: var(--color-accent-text);
    border: none;
    padding: 16px 32px;
    font-size: 1rem;
    cursor: pointer;
    flex-grow: 0;
}

.btn-add-main:hover {
    opacity: 0.9;
}

/* Footer */
footer {
    border-top: 1px solid var(--color-border);
    padding: 60px 0;
    margin-top: 60px;
    text-align: center;
}

.footer-text {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* Simple error pages (used by Nginx error_page) */
.error-page {
    padding: 80px 16px;
}

.error-title {
    font-size: 2rem;
    font-weight: 600;
}

.error-text {
    margin-top: 12px;
    color: var(--color-text-secondary);
    max-width: 70ch;
}

.error-link {
    margin-top: 20px;
}

.error-link a {
    text-decoration: underline;
}

.cart-empty {
    text-align: center;
    color: var(--color-text-secondary);
    padding: 1rem 0;
}

.cart-item-qty {
    display: flex;
    align-items: center;
    gap: 4px;
}

.qty-btn {
    width: 24px;
    height: 24px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
}

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

.cart-item-qty input {
    width: 40px;
    text-align: center;
}

.cart-item-remove {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--color-text-secondary);
    padding: 0 4px;
}

.cart-item-remove:hover {
    color: #f44336;
}

.cart-total {
    padding: 1rem 0;
    border-top: 1px solid var(--color-border);
    margin-top: 1rem;
    text-align: right;
}

.cart-toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--color-accent);
    color: var(--color-accent-text);
    padding: 12px 24px;
    border-radius: 4px;
    z-index: 9999;
    animation: fadeInOut 2s ease;
}

@keyframes fadeInOut {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    15% {
        opacity: 1;
        transform: translateY(0);
    }
    85% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-10px);
    }
}

.nav-link.active {
    font-weight: 700;
    border-bottom: 2px solid var(--color-accent);
}

.nav-user {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.inline-form {
    display: inline-flex;
    align-items: center;
}

.nav-button,
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-accent);
    background: var(--color-accent);
    color: var(--color-accent-text);
    padding: 0.65rem 1rem;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
}

.nav-button {
    padding: 0.45rem 0.85rem;
}

.nav-button:hover,
.btn-primary:hover {
    opacity: 0.9;
}

.page-shell {
    padding-bottom: var(--spacing-xl);
}

.auth-card {
    max-width: 480px;
    margin: 2rem auto 0;
    padding: 2rem;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg);
}

.auth-title {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

.auth-form {
    display: grid;
    gap: 0.85rem;
}

.form-label {
    font-size: 0.95rem;
    font-weight: 600;
}

.auth-form input,
.auth-form textarea,
.auth-form select {
    width: 100%;
    padding: 0.8rem 0.9rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 1rem;
}

.auth-footnote {
    margin-top: 1rem;
    color: var(--color-text-secondary);
}

.auth-footnote a {
    text-decoration: underline;
}

.form-alert {
    padding: 0.85rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.form-alert-error {
    background: #fff1f1;
    border: 1px solid #f2b8b5;
    color: #8a1c1c;
}

.form-alert-success {
    background: #eef8ef;
    border: 1px solid #b8ddb9;
    color: #1a5d23;
}

@media (max-width: 860px) {
    .nav-bar {
        height: auto;
        padding: 1rem 0;
        align-items: flex-start;
        gap: 1rem;
        flex-direction: column;
    }

    .nav-menu {
        flex-wrap: wrap;
        gap: 0.9rem;
    }

    .shopping-list {
        width: min(350px, calc(100vw - 2rem));
        right: auto;
        left: 0;
    }
}