:root {
    --bg: #f8f9fa;
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --ink: #1a1a1a;
    --muted: #898989;
    --accent: #0f766e;
    --accent-deep: #0b554f;
    --accent-rgb: 15, 118, 110;
    --line: rgba(0, 0, 0, 0.08);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.12), 0 8px 24px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    color: var(--ink);
}

a {
    color: inherit;
    text-decoration: none;
}

.shell {
    width: min(1680px, calc(100% - 1.5rem));
    margin: 0 auto;
    padding: 0;
}

.shell-wide {
    width: min(1680px, calc(100% - 1.5rem));
}

.site-footer,
.panel {
    -webkit-backdrop-filter: blur(12px);
    background: var(--surface);
    backdrop-filter: blur(12px);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    padding: 20px;
}

.site-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.25rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.85rem;
}

.brand strong,
.brand small {
    display: block;
}

.brand small,
.site-footer {
    color: var(--muted);
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 3rem;
    height: 3rem;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--accent), var(--accent-deep));
    color: #fff;
    font-weight: 700;
    letter-spacing: 0.08em;
}

.brand-logo {
    display: block;
    width: auto;
    max-width: min(12rem, 28vw);
    height: 3rem;
    border-radius: 18px;
    object-fit: contain;
    background: rgba(255, 255, 255, 0.82);
    padding: 0;
    border: 1px solid var(--line);
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-nav a {
    padding: 0.45rem 0.75rem;
    border-radius: 999px;
    transition: background-color 180ms ease, transform 180ms ease;
    display: grid;
    align-items: center;
}

.nav-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.4rem;
    min-height: 1.4rem;
    margin-left: 0.35rem;
    padding: 0 0.35rem;
    border-radius: 999px;
    background: var(--accent-deep);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 700;
}

.nav-count.is-hidden {
    display: none;
}

.flash-banner {
    margin-bottom: 1rem;
    padding: 0.9rem 1rem;
    border-radius: 18px;
    border: 1px solid rgba(15, 118, 110, 0.2);
    background: rgba(255, 252, 246, 0.96);
    box-shadow: var(--shadow);
}

.flash-banner-success {
    border-color: rgba(15, 118, 110, 0.28);
}

.flash-banner-error {
    border-color: rgba(180, 83, 9, 0.28);
}

.site-nav a:hover,
.site-nav a:focus-visible {
    background: rgba(15, 118, 110, 0.12);
    transform: translateY(-1px);
}

/* Mobile nav toggle button (hamburger) */
.site-nav-toggle {
    display: none;
    flex-shrink: 0;
    margin-left: auto;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0.4rem;
    border: none;
    border-radius: 12px;
    background: transparent;
    cursor: pointer;
}

.site-nav-toggle span {
    display: block;
    height: 2px;
    border-radius: 1px;
    background: var(--ink);
    transition: transform 200ms ease, opacity 200ms ease;
}

.site-nav-toggle.is-active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.site-nav-toggle.is-active span:nth-child(2) {
    opacity: 0;
}

.site-nav-toggle.is-active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

main {
    display: grid;
    gap: 1.5rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    padding: 0.75rem 1rem;
    border-radius: 999px;
    border: 1px solid transparent;
    cursor: pointer;
    transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
}

.button-primary {
    background: linear-gradient(135deg, var(--accent), var(--accent-deep));
    color: #fff;
}

.button-primary:hover,
.button-primary:focus-visible {
    background: linear-gradient(135deg, var(--accent-deep), var(--accent));
    transform: translateY(-1px);
}

.button.is-loading {
    position: relative;
    pointer-events: none;
}

.button.is-loading::before {
    content: '';
    width: 0.95rem;
    height: 0.95rem;
    margin-right: 0.5rem;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.45);
    border-top-color: #fff;
    animation: cart-spin 700ms linear infinite;
}

.button-secondary {
    border-color: var(--line);
    background: rgba(255, 255, 255, 0.55);
}

.button:hover:disabled {
    cursor: not-allowed;
}

.button-secondary:hover:not(:disabled):not([disabled]):not(.is-disabled),
.button-secondary:focus-visible:not(:disabled):not([disabled]):not(.is-disabled) {
    border-color: transparent;
    background: linear-gradient(135deg, var(--accent-deep), var(--accent));
    color: #fff;
    transform: translateY(-1px);
}

.panel,
.catalog-header,
.about-page,
.not-found {
    display: grid;
    gap: 1rem;
}

[data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 320ms ease, transform 320ms ease;
}

/* No-JS fallback: visible immediately */
[data-reveal]:not(.is-initialized) {
    opacity: 1;
    transform: translateY(0);
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 920px) {
    .product-grid,
    .category-grid,
    .detail-layout,
    .cart-layout,
        .checkout-layout,
        .order-status-layout,
    .cart-item-row,
    .checkout-grid-2,
    .checkout-grid-3 {
        grid-template-columns: 1fr;
    }

    .catalog-toolbar,
    .catalog-pagination {
        align-items: stretch;
        flex-direction: column;
    }

    .detail-cta {
        grid-template-columns: 1fr;
    }

    .detail-cart-form {
        grid-template-columns: auto minmax(0, 1fr);
    }

    .detail-cart-form .button {
        grid-column: 1 / -1;
    }

    .catalog-sort-form {
        width: 100%;
        margin-left: 0;
    }

    .catalog-sort-form select {
        width: 100%;
    }

    .mini-cart-drawer {
        width: 100%;
    }
}

/* Mobile nav drawer and backdrop */
@media (max-width: 768px) {

    .site-nav {
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        width: min(18rem, 85vw);
        flex-direction: column;
        flex-wrap: nowrap;
        gap: 0;
        padding: 4rem 1.25rem 1.25rem;
        background: var(--surface-strong);
        border-left: 1px solid var(--line);
        box-shadow: -10px 0 40px rgba(0, 0, 0, 0.15);
        z-index: 110;
        transform: translateX(100%);
        transition: transform 300ms ease;
    }

    .site-nav-toggle {
        display: flex;
        margin-left: auto;
    }

    .site-nav.is-open {
        transform: translateX(0);
    }

    .site-nav a {
        display: flex;
        align-items: center;
        padding: 0.75rem 1rem;
        border-radius: 12px;
    }

    .site-nav-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.35);
        z-index: 100;
        opacity: 0;
        transition: opacity 300ms ease;
        pointer-events: none;
    }

    .site-nav-backdrop.is-open {
        opacity: 1;
        pointer-events: auto;
    }
}

@media (max-width: 640px) {
    .shell {
        width: min(100% - 1rem, 100%);
    }

    .shell-wide {
        width: min(100% - 0.75rem, 100%);
    }
}

@supports (-webkit-touch-callout: none) {
    .site-footer,
    .panel,
    .product-card,
    .category-card,
    .detail-panel,
    .detail-sidebar,
    .detail-section,
    .category-pill,
    .button-secondary,
    .product-media,
    .detail-media-figure,
    .detail-media-thumb,
    .detail-stat,
    .catalog-page-link,
    .site-nav {
        background: rgba(255, 252, 246, 0.98);
    }

    .site-footer,
    .panel,
    .product-card,
    .category-card,
    .detail-panel,
    .detail-sidebar,
    .site-nav {
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }

    .button,
    .site-nav a,
    .category-pill,
    .nav-count,
    .brand-mark,
    .flash-banner,
    .sale-badge,
    .catalog-page-link {
        -webkit-text-fill-color: currentColor;
    }

    .button {
        -webkit-appearance: none;
        appearance: none;
    }

    .button-primary,
    .nav-count,
    .brand-mark,
    .sale-badge,
    .catalog-page-link.is-active {
        color: #fff;
        -webkit-text-fill-color: #fff;
    }

    .button-secondary,
    .site-nav a,
    .category-pill,
    .catalog-page-link,
    .flash-banner {
        color: var(--ink);
    }

    .catalog-sort-form select,
    .search-form input,
    .detail-cart-form input,
    .cart-quantity-form input,
    .checkout-field input,
    .checkout-field textarea,
    .checkout-field select {
        -webkit-appearance: none;
        appearance: none;
        background-color: var(--surface-strong);
        color: var(--ink);
        -webkit-text-fill-color: var(--ink);
    }

    .catalog-sort-form select option,
    .checkout-field select option {
        color: var(--ink);
        background: var(--surface-strong);
    }
}

@keyframes cart-spin {
    to {
        transform: rotate(360deg);
    }
}