/* ============================================================
   HEADER — Sticky, navegação e menu mobile
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition),
    background-color var(--transition);
}

/* Estado ao rolar a página (classe adicionada via JS) */
.site-header.is-scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-header);
  background-color: rgba(255, 255, 255, 0.92);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* ---- Logo ---- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
  background: var(--gradient-brand);
  color: #fff;
  font-size: 1.125rem;
  box-shadow: 0 6px 16px rgba(109, 40, 168, 0.28);
}

/* ---- Navegação desktop ---- */
.nav-list {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-link {
  position: relative;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding-block: 6px;
  transition: color var(--transition);
}

/* Underline animado no menu */
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-brand);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-text);
}

.nav-link:hover::after,
.nav-link.is-active::after {
  transform: scaleX(1);
}

/* ---- Ações do header ---- */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ---- Botão hamburger ---- */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  transition: background-color var(--transition);
}

.menu-toggle:hover {
  background-color: var(--color-bg-alt);
}

.menu-bar {
  display: block;
  width: 22px;
  height: 2px;
  margin-inline: auto;
  border-radius: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

/* Animação hamburger → X quando aberto */
.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Menu mobile ---- */
.nav-mobile {
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-card);
  transform: translateY(-12px);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition), opacity var(--transition),
    visibility var(--transition);
}

.nav-mobile.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav-mobile-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px var(--container-pad) 24px;
}

.nav-mobile-link {
  display: block;
  padding: 14px 12px;
  border-radius: var(--radius);
  font-family: var(--font-heading);
  font-weight: 500;
  color: var(--color-text);
  transition: background-color var(--transition), color var(--transition);
}

.nav-mobile-link:hover,
.nav-mobile-link.is-active {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.nav-mobile .btn {
  margin-top: 8px;
}