.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-sizing: border-box;
    width: 100%;
    min-height: var(--arme-header-height);
    padding-inline: max(var(--page-gutter), calc((100% - var(--page-width)) / 2));
    gap: 20px;
    background: var(--arme-background);
    transition: background-color 220ms ease;
}

.site-header__brand {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 0;
}

.site-header__logo {
    display: block;
    width: auto;
    height: 44px;
    object-fit: contain;
    flex-shrink: 0;
    filter: drop-shadow(var(--arme-logo-glow));
    transition: filter 220ms ease;
}

[data-theme="dark"] .site-header__logo {
    filter: brightness(100) drop-shadow(var(--arme-logo-glow));
}

.site-header__brand-copy {
    padding-left: 16px;
    border-left: 1px solid var(--arme-border);
    color: var(--arme-muted);
    font-size: 0.68rem;
    font-weight: 600;
    line-height: 1.45;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.site-header__nav {
    display: flex;
    align-items: center;
    gap: clamp(20px, 2.4vw, 44px);
}

.site-header__nav-item {
    position: relative;
}

.site-header__nav-item--has-children {
    padding-bottom: 18px;
    margin-bottom: -18px;
}

.site-header__nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--arme-nav-link);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    transition: color 180ms ease;
}

.site-header__nav-item--has-children > .site-header__nav-link::after {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 2px;
    border-top: 4px solid currentColor;
    border-right: 3.5px solid transparent;
    border-left: 3.5px solid transparent;
    content: "";
    opacity: 0.7;
    transition: transform 180ms ease;
}

.site-header__nav-link::before {
    position: absolute;
    right: 0;
    bottom: -8px;
    left: 0;
    height: 1px;
    content: "";
    background: var(--arme-blue-light);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 220ms ease;
}

.site-header__nav-link:hover,
.site-header__nav-item:focus-within > .site-header__nav-link,
.site-header__nav-item--open > .site-header__nav-link,
.site-header__nav-link--active {
    color: var(--arme-nav-link-hover);
}

.site-header__nav-link:hover::before,
.site-header__nav-item:focus-within > .site-header__nav-link::before,
.site-header__nav-item--open > .site-header__nav-link::before,
.site-header__nav-link--active::before {
    transform: scaleX(1);
    transform-origin: left;
}

.site-header__nav-item:hover > .site-header__nav-link::after,
.site-header__nav-item:focus-within > .site-header__nav-link::after,
.site-header__nav-item--open > .site-header__nav-link::after {
    transform: rotate(180deg);
}

.site-header__nav-dropdown {
    position: absolute;
    top: calc(100% - 10px);
    left: 50%;
    z-index: 30;
    display: grid;
    gap: 2px;
    min-width: 280px;
    padding: 10px;
    border: 1px solid var(--arme-border);
    border-radius: 14px;
    background: var(--arme-dropdown-bg);
    box-shadow: var(--arme-dropdown-shadow);
    backdrop-filter: blur(18px);
    opacity: 0;
    pointer-events: none;
    transform: translate(-50%, -6px);
    transition:
        opacity 180ms ease,
        transform 180ms ease;
}

.site-header__nav-item:hover > .site-header__nav-dropdown,
.site-header__nav-item:focus-within > .site-header__nav-dropdown,
.site-header__nav-item--open > .site-header__nav-dropdown {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, 0);
}

.site-header__nav-sublink {
    display: block;
    padding: 11px 12px;
    border-radius: 10px;
    color: var(--arme-nav-link);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    line-height: 1.35;
    text-transform: none;
    transition:
        color 160ms ease,
        background-color 160ms ease;
}

.site-header__nav-sublink:hover,
.site-header__nav-sublink:focus-visible {
    color: var(--arme-nav-link-hover);
    background: var(--arme-dropdown-item-hover);
}

/* Mega menu — Sistemas Constructivos */
.site-header__nav-item--mega > .site-header__nav-dropdown--mega {
    left: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 0;
    row-gap: 0;
    min-width: min(720px, calc(100vw - 48px));
    max-width: min(780px, calc(100vw - 48px));
    padding: 8px 12px;
    border-radius: 16px;
    background: var(--arme-dropdown-bg);
    transform: translate(0, -6px);
}

.site-header__nav-item--mega:hover > .site-header__nav-dropdown--mega,
.site-header__nav-item--mega:focus-within > .site-header__nav-dropdown--mega,
.site-header__nav-item--mega.site-header__nav-item--open > .site-header__nav-dropdown--mega {
    transform: translate(0, 0);
}

.site-header__nav-dropdown--mega .site-header__nav-sublink--rich {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: start;
    gap: 14px;
    padding: 16px 14px;
    border-radius: 0;
    background: transparent;
    color: var(--arme-nav-link-hover);
    letter-spacing: 0;
    text-transform: none;
}

.site-header__nav-dropdown--mega .site-header__nav-sublink--rich:nth-child(n + 3) {
    border-top: 1px solid var(--arme-border);
}

.site-header__nav-dropdown--mega .site-header__nav-sublink--rich:nth-child(even) {
    border-left: 1px solid var(--arme-border);
    margin-left: 4px;
    padding-left: 18px;
}

.site-header__nav-dropdown--mega .site-header__nav-sublink--rich:hover,
.site-header__nav-dropdown--mega .site-header__nav-sublink--rich:focus-visible {
    background: var(--arme-dropdown-item-hover);
    border-radius: 10px;
}

.site-header__nav-sublink-icon {
    margin-top: 2px;
    color: var(--arme-blue-light);
    font-size: 22px;
    font-variation-settings: "FILL" 0, "wght" 300, "GRAD" 0, "opsz" 24;
    line-height: 1;
}

.site-header__nav-sublink-copy {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.site-header__nav-sublink-title {
    color: var(--arme-nav-link-hover);
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    line-height: 1.25;
}

.site-header__nav-sublink-desc {
    color: var(--arme-nav-link);
    font-size: 0.72rem;
    font-weight: 400;
    letter-spacing: 0;
    line-height: 1.4;
}

.site-header__nav-sublink-arrow {
    align-self: center;
    color: var(--arme-blue-light);
    font-size: 18px;
    font-variation-settings: "FILL" 0, "wght" 300, "GRAD" 0, "opsz" 20;
    opacity: 0.85;
    transition: transform 180ms ease;
}

.site-header__nav-dropdown--mega .site-header__nav-sublink--rich:hover .site-header__nav-sublink-arrow,
.site-header__nav-dropdown--mega .site-header__nav-sublink--rich:focus-visible .site-header__nav-sublink-arrow {
    transform: translateX(3px);
}

.site-header__controls {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.theme-switch {
    position: relative;
    display: grid;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    color: var(--arme-menu-fg);
    background: transparent;
    place-items: center;
    cursor: pointer;
    transition: color 180ms ease;
}

.theme-switch:hover {
    color: var(--arme-blue-light);
}

.theme-switch__icon {
    position: absolute;
    width: 18px;
    height: 18px;
    transition:
        opacity 180ms ease,
        transform 180ms ease;
}

.theme-switch__icon svg {
    display: block;
    width: 100%;
    height: 100%;
}

.theme-switch[data-theme="dark"] .theme-switch__icon--sun,
.theme-switch:not([data-theme]) .theme-switch__icon--sun {
    opacity: 1;
    transform: scale(1);
}

.theme-switch[data-theme="dark"] .theme-switch__icon--moon,
.theme-switch:not([data-theme]) .theme-switch__icon--moon {
    opacity: 0;
    transform: scale(0.7);
}

.theme-switch[data-theme="light"] .theme-switch__icon--sun {
    opacity: 0;
    transform: scale(0.7);
}

.theme-switch[data-theme="light"] .theme-switch__icon--moon {
    opacity: 1;
    transform: scale(1);
}

.site-header__menu {
    display: none;
    position: relative;
    width: 50px;
    height: 50px;
    padding: 0;
    border: 1px solid var(--arme-border);
    border-radius: 50%;
    color: var(--arme-menu-fg);
    background: var(--arme-menu-bg);
    place-items: center;
    cursor: pointer;
    backdrop-filter: blur(18px);
    transition:
        border-color 180ms ease,
        background-color 180ms ease,
        color 180ms ease;
}

.site-header__menu:hover {
    border-color: var(--arme-menu-border-hover);
    background: var(--arme-menu-bg-hover);
}

.site-header__menu-lines,
.site-header__menu-lines::before,
.site-header__menu-lines::after {
    display: block;
    width: 17px;
    height: 1px;
    background: currentColor;
}

.site-header__menu-lines {
    position: relative;
}

.site-header__menu-lines::before,
.site-header__menu-lines::after {
    position: absolute;
    right: 0;
    content: "";
}

.site-header__menu-lines::before {
    top: -5px;
    width: 13px;
}

.site-header__menu-lines::after {
    top: 5px;
    width: 10px;
}