/* Site header and primary navigation (mobile-first) */

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.96);
    border-bottom: 1px solid var(--color-border);
}

.navbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-height);
    gap: var(--space-3);
}

.navbar__brand {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-text);
    text-decoration: none;
}
.navbar__brand:hover { color: var(--color-primary); }

.navbar__toggle {
    display: none; /* shown only when JS is available (see .js below) */
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.navbar__toggle-icon,
.navbar__toggle-icon::before,
.navbar__toggle-icon::after {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}
.navbar__toggle-icon { position: relative; }
.navbar__toggle-icon::before,
.navbar__toggle-icon::after { content: ""; position: absolute; left: 0; }
.navbar__toggle-icon::before { top: -6px; }
.navbar__toggle-icon::after { top: 6px; }

.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon { background: transparent; }
.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon::before { top: 0; transform: rotate(45deg); }
.navbar__toggle[aria-expanded="true"] .navbar__toggle-icon::after { top: 0; transform: rotate(-45deg); }

.navbar__menu {
    flex-basis: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding-bottom: var(--space-4);
}

/* With JS, the mobile menu is collapsed until toggled */
.js .navbar__toggle { display: inline-flex; }
.js .navbar__menu:not(.is-open) { display: none; }

.navbar__links { display: flex; flex-direction: column; gap: var(--space-1); }
.navbar__links a,
.navbar__link {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding-inline: var(--space-2);
    color: var(--color-text);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-sm);
}
.navbar__links a:hover,
.navbar__link:hover { background: var(--color-surface-2); color: var(--color-text); }

.navbar__actions { display: flex; flex-direction: column; gap: var(--space-2); }
.navbar__actions .btn { width: 100%; }

@media (min-width: 900px) {
    .navbar { flex-wrap: nowrap; gap: var(--space-5); }

    .navbar__toggle,
    .js .navbar__toggle { display: none; }

    .navbar__menu,
    .js .navbar__menu:not(.is-open) {
        display: flex;
        flex: 1;
        flex-basis: auto;
        flex-direction: row;
        align-items: center;
        gap: var(--space-5);
        padding-bottom: 0;
    }

    .navbar__links { flex-direction: row; gap: var(--space-1); }
    .navbar__search { flex: 1; max-width: 340px; margin-left: auto; }
    .navbar__actions { flex-direction: row; align-items: center; gap: var(--space-2); }
    .navbar__actions .btn { width: auto; }
}

/* Log out is a POST form (CSRF-safe) styled like a link */
.navbar__logout { margin: 0; }
.navbar__link--button {
    width: 100%;
    background: transparent;
    border: 0;
    font: inherit;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
}
@media (min-width: 900px) {
    .navbar__link--button { width: auto; }
}

/* Cart item count */
.navbar__count {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 1.4rem; height: 1.4rem; margin-left: var(--space-2); padding-inline: 0.35rem;
    font-size: 0.75rem; font-weight: 700; color: #fff; background: var(--color-primary); border-radius: 999px;
}