/* ==========================================================
   HEADER
   ========================================================== */

.site-header {
    position: fixed;

    top: 0;
    left: 0;

    z-index: var(--z-header);

    width: 100%;

    color: var(--color-text-primary);

    transition:
        background-color var(--transition-base),
        border-color var(--transition-base),
        box-shadow var(--transition-base),
        backdrop-filter var(--transition-base);
}


/* ==========================================================
   CONTAINER
   ========================================================== */

.site-header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: var(--space-4);

    min-height: 88px;

    transition:
        min-height var(--transition-base);
}


/* ==========================================================
   ESTADO AO ROLAR
   ========================================================== */

.site-header.is-scrolled {
    background:
        rgba(246, 243, 237, 0.82);

    border-bottom:
        1px solid rgba(16, 24, 32, 0.08);

    box-shadow:
        0 8px 30px rgba(16, 24, 32, 0.04);

    backdrop-filter:
        blur(18px);

    -webkit-backdrop-filter:
        blur(18px);
}


.site-header.is-scrolled .site-header__container {
    min-height: 72px;
}


/* ==========================================================
   BRAND
   ========================================================== */

.site-header__brand {
    position: relative;

    z-index: 2;

    display: inline-flex;
    align-items: center;

    flex-shrink: 0;
}


.site-header__brand-name {
    color: var(--color-text-primary);

    font-family: var(--font-body);

    font-size: 1.35rem;
    font-weight: var(--font-weight-bold);

    letter-spacing: -0.04em;

    line-height: 1;
}


.site-header__brand-name span {
    color: var(--color-accent);
}


/* ==========================================================
   NAVEGAÇÃO DESKTOP
   ========================================================== */

.site-nav {
    margin-left: auto;
}


.site-nav__list {
    display: flex;
    align-items: center;

    gap: clamp(
        1.5rem,
        2.5vw,
        2.5rem
    );
}


.site-nav__link {
    position: relative;

    display: inline-flex;
    align-items: center;

    padding-block: 0.5rem;

    color: var(--color-text-primary);

    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);

    line-height: 1.2;
}


.site-nav__link::after {
    content: "";

    position: absolute;

    right: 0;
    bottom: 0;

    width: 100%;
    height: 1px;

    background: var(--color-accent);

    transform: scaleX(0);
    transform-origin: right center;

    transition:
        transform var(--transition-base);
}


.site-nav__link:hover::after,
.site-nav__link:focus-visible::after {
    transform: scaleX(1);

    transform-origin: left center;
}


/* ==========================================================
   AÇÕES
   ========================================================== */

.site-header__actions {
    display: flex;
    align-items: center;

    gap: var(--space-3);
}


/* ==========================================================
   MENU TOGGLE
   ========================================================== */

.menu-toggle {
    position: relative;

    z-index: 1002;

    display: none;

    width: 48px;
    height: 48px;

    padding: 0;

    border-radius: 50%;

    background: transparent;

    cursor: pointer;
}


.menu-toggle__line {
    position: absolute;

    left: 50%;

    width: 22px;
    height: 1.5px;

    background: currentColor;

    transform:
        translateX(-50%);

    transition:
        top var(--transition-base),
        transform var(--transition-base);
}


.menu-toggle__line:first-child {
    top: 19px;
}


.menu-toggle__line:last-child {
    top: 28px;
}


/* ==========================================================
   MENU ABERTO
   ========================================================== */

.menu-toggle.is-active .menu-toggle__line:first-child {
    top: 24px;

    transform:
        translateX(-50%)
        rotate(45deg);
}


.menu-toggle.is-active .menu-toggle__line:last-child {
    top: 24px;

    transform:
        translateX(-50%)
        rotate(-45deg);
}


/* ==========================================================
   MOBILE NAV
   ========================================================== */

.mobile-nav {
    position: fixed;

    inset: 0;

    z-index: 1000;

    display: none;

    padding-top: 88px;

    background: var(--color-bg);

    visibility: hidden;
    opacity: 0;

    transform:
        translateY(-12px);

    transition:
        visibility var(--transition-base),
        opacity var(--transition-base),
        transform var(--transition-base);
}


.mobile-nav.is-open {
    visibility: visible;
    opacity: 1;

    transform: translateY(0);
}


.mobile-nav__inner {
    display: flex;
    flex-direction: column;
    justify-content: space-between;

    width: min(
        100% - 2.5rem,
        var(--container-max)
    );

    height: calc(100dvh - 88px);

    margin-inline: auto;

    padding:
        var(--space-8)
        0
        var(--space-5);
}


/* ==========================================================
   MOBILE LINKS
   ========================================================== */

.mobile-nav__list {
    display: flex;
    flex-direction: column;
}


.mobile-nav__list li {
    border-bottom:
        1px solid var(--color-border);
}


.mobile-nav__link {
    display: flex;
    align-items: baseline;

    gap: var(--space-3);

    padding:
        1.5rem
        0;

    color: var(--color-text-primary);

    font-family: var(--font-display);

    font-size:
        clamp(2rem, 9vw, 3.25rem);

    font-weight: var(--font-weight-medium);

    line-height: 1;
}


.mobile-nav__link span {
    color: var(--color-accent);

    font-family: var(--font-body);

    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);

    letter-spacing: 0.12em;
}


/* ==========================================================
   MOBILE ACTIONS
   ========================================================== */

.mobile-nav__actions {
    display: grid;

    gap: var(--space-2);
}


.mobile-nav__actions .button {
    width: 100%;
}


/* ==========================================================
   BODY COM MENU ABERTO
   ========================================================== */

body.nav-open {
    overflow: hidden;
}


/* ==========================================================
   ACESSIBILIDADE
   ========================================================== */

.site-header a:focus-visible,
.menu-toggle:focus-visible {
    outline-offset: 3px;
}

/* ==========================================================
   HEADER SOBRE HERO
   ========================================================== */

.site-header:not(.is-scrolled) {
    color:
        var(--color-text-inverse);
}


.site-header:not(.is-scrolled)
.site-header__brand-name,

.site-header:not(.is-scrolled)
.site-nav__link,

.site-header:not(.is-scrolled)
.button--ghost {
    color:
        var(--color-text-inverse);
}


.site-header:not(.is-scrolled)
.site-nav__link::after {
    background:
        var(--color-accent-soft);
}


.site-header:not(.is-scrolled)
.menu-toggle {
    color:
        var(--color-text-inverse);
}


.site-header:not(.is-scrolled)
.site-header__actions
.button--primary {
    background:
        var(--color-accent);

    border-color:
        var(--color-accent);

    color:
        var(--color-surface-dark);
}


.site-header:not(.is-scrolled)
.site-header__actions
.button--primary:hover {
    background:
        var(--color-accent-soft);

    border-color:
        var(--color-accent-soft);
}

/* ==========================================================
   CORREÇÃO — MENU MOBILE APÓS SCROLL

   Quando o menu mobile estiver aberto, removemos o efeito
   glass do Header e garantimos uma superfície totalmente
   opaca para a bandeja de navegação.

   Isso evita conflito entre backdrop-filter do Header
   scrolled e o overlay fixed do menu mobile.
   ========================================================== */

body.nav-open .site-header {
    background:
        var(--color-bg);

    border-bottom-color:
        transparent;

    box-shadow:
        none;

    backdrop-filter:
        none;

    -webkit-backdrop-filter:
        none;
}


/* Mantém Header e menu com a identidade correta
   mesmo quando .is-scrolled estiver ativo. */

body.nav-open
.site-header.is-scrolled {
    background:
        var(--color-bg);
}


/* Superfície do menu sempre opaca */

body.nav-open
.mobile-nav,
.mobile-nav.is-open {
    background:
        var(--color-bg);

    opacity:
        1;
}


/* Quando aberto, o Header deixa de usar as cores
   do Hero e assume a aparência clara do menu. */

body.nav-open
.site-header__brand-name,

body.nav-open
.menu-toggle {
    color:
        var(--color-text-primary);
}


/* Mantém o "4" da marca no accent */

body.nav-open
.site-header__brand-name span {
    color:
        var(--color-accent);
}