/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-base) var(--ease-premium),
    background-color var(--duration-base) var(--ease-premium);
}

.site-header.is-scrolled {
  border-bottom-color: var(--border-soft);
  background: rgba(0, 0, 0, 0.88);
}

.site-header__bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-4);
  height: 4.75rem;
}

@media (min-width: 64rem) {
  .site-header__bar {
    grid-template-columns: 1fr auto 1fr;
  }
}

.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.brand__mark {
  height: 1.5rem;
  width: auto;
}

.nav-primary {
  display: none;
}

@media (min-width: 64rem) {
  .nav-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
  }

  .nav-primary a {
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    white-space: nowrap;
    position: relative;
    padding-block: var(--space-1);
    transition: color var(--duration-fast) var(--ease-premium);
  }

  .nav-primary a:hover,
  .nav-primary a:focus-visible {
    color: var(--text);
  }
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
}

.header-actions .btn {
  display: none;
}

@media (min-width: 64rem) {
  .header-actions .btn { display: inline-flex; }
}

.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-premium);
}

.menu-toggle:hover { border-color: var(--border-strong); }

.menu-toggle svg {
  width: 1.25rem;
  height: 1.25rem;
}

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

/* ===== Menu mobile — tela cheia ===== */
.mobile-nav {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: rgba(0, 0, 0, 0.97);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  flex-direction: column;
  padding: var(--space-5) var(--container-pad) var(--space-7);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--duration-base) var(--ease-premium),
    transform var(--duration-base) var(--ease-premium),
    visibility 0s linear var(--duration-base);
}

.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity var(--duration-base) var(--ease-premium),
    transform var(--duration-base) var(--ease-premium),
    visibility 0s linear 0s;
}

.mobile-nav__top {
  display: flex;
  justify-content: flex-end;
  margin-bottom: var(--space-7);
}

.mobile-nav__close {
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
}

.mobile-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.mobile-nav a {
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.mobile-nav__footer {
  margin-top: auto;
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-soft);
}

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

/* ===== Botões ===== */
.btn {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  text-align: center;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--duration-base) var(--ease-premium),
    border-color var(--duration-base) var(--ease-premium),
    color var(--duration-base) var(--ease-premium),
    transform var(--duration-fast) var(--ease-premium);
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 40%, rgba(255, 255, 255, 0.35) 50%, transparent 60%);
  transform: translateX(-120%);
  transition: transform 0.6s var(--ease-premium);
  pointer-events: none;
}

.btn:hover::after { transform: translateX(120%); }

.btn--primary {
  background: var(--text);
  color: var(--bg);
}
.btn--primary:hover, .btn--primary:focus-visible {
  transform: translateY(-2px);
}
.btn--primary::after {
  background: linear-gradient(115deg, transparent 40%, rgba(0, 0, 0, 0.25) 50%, transparent 60%);
}

.btn--ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn--ghost:hover, .btn--ghost:focus-visible {
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-2px);
}

.btn--sm {
  padding: var(--space-2) var(--space-5);
  font-size: 0.875rem;
  min-height: 40px;
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: 1.0625rem;
  min-height: 56px;
}

.btn--block { width: 100%; }

@media (prefers-reduced-motion: reduce) {
  .btn::after { display: none; }
  .btn:hover { transform: none; }
}