/* ============================================
   Shell — Header, Navigation, Skip link
   ============================================ */

.skip-nav {
    background-color: var(--accent);
    color: var(--ink);
    font-size: 0.875rem;
    left: 0.5rem;
    padding: 0.5rem 1rem;
    position: absolute;
    top: -3rem;
    transition: top var(--transition);
    z-index: 300;
}

.skip-nav:focus {
    top: 0.5rem;
}

.mast {
    align-items: center;
    background-color: var(--paper);
    display: flex;
    justify-content: space-between;
    left: 0;
    padding: var(--space-s) var(--space-m);
    position: sticky;
    right: 0;
    top: 0;
    z-index: 200;
}

@media (min-width: 48rem) {
    .mast {
        padding: var(--space-s) var(--space-l);
    }
}

.logotype {
    align-items: center;
    color: var(--ink);
    display: flex;
    font-family: var(--font-display);
    font-size: 1.125rem;
    gap: 0.5rem;
    letter-spacing: 0.05em;
    text-decoration: none;
    text-transform: uppercase;
}

.logotype:hover {
    color: var(--sage);
}

.logotype-icon {
    height: 2rem;
    width: 2rem;
}

.mast-nav {
    display: none;
    list-style: none;
}

@media (min-width: 64rem) {
    .mast-nav {
        align-items: center;
        display: flex;
        gap: var(--space-l);
    }
}

.mast-nav a {
    color: var(--ink);
    font-size: 0.875rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    transition: color var(--transition);
}

.mast-nav a:hover {
    color: var(--accent);
}

.nav-trigger {
    align-items: center;
    background: none;
    border: none;
    color: var(--ink);
    display: flex;
    height: 3rem;
    justify-content: center;
    padding: 0;
    width: 3rem;
}

@media (min-width: 64rem) {
    .nav-trigger {
        display: none;
    }
}

.nav-trigger span {
    background-color: var(--ink);
    display: block;
    height: 0.125rem;
    position: relative;
    transition: background-color var(--transition);
    width: 1.5rem;
}

.nav-trigger span::before,
.nav-trigger span::after {
    background-color: var(--ink);
    content: '';
    display: block;
    height: 0.125rem;
    left: 0;
    position: absolute;
    transition: transform var(--transition);
    width: 1.5rem;
}

.nav-trigger span::before {
    top: -0.4375rem;
}

.nav-trigger span::after {
    top: 0.4375rem;
}

.nav-trigger[aria-expanded="true"] span {
    background-color: transparent;
}

.nav-trigger[aria-expanded="true"] span::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-trigger[aria-expanded="true"] span::after {
    top: 0;
    transform: rotate(-45deg);
}

/* Mobile overlay */
.mast-overlay {
    align-items: center;
    background-color: var(--paper);
    display: flex;
    flex-direction: column;
    inset: 0;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    position: fixed;
    transition: opacity var(--transition);
    z-index: 250;
}

.mast-overlay.is-open {
    opacity: 1;
    pointer-events: all;
}

.mast-overlay-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-l);
    list-style: none;
    text-align: center;
}

.mast-overlay-nav a {
    color: var(--ink);
    font-family: var(--font-display);
    font-size: 1.5rem;
    text-decoration: none;
    transition: color var(--transition);
}

.mast-overlay-nav a:hover {
    color: var(--accent);
}

/* CTA button in header */
.mast-cta {
    background-color: var(--accent);
    border: none;
    border-radius: var(--radius);
    color: var(--ink);
    display: none;
    font-size: 0.8125rem;
    letter-spacing: 0.04em;
    padding: 0.625rem 1.25rem;
    text-decoration: none;
    text-transform: uppercase;
    transition: background-color var(--transition);
}

.mast-cta:hover {
    background-color: var(--accent-hover);
    color: var(--ink);
}

@media (min-width: 64rem) {
    .mast-cta {
        display: inline-block;
    }
}