/*
  NAVBAR.CSS — Navegação principal
*/

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: var(--z-header);
  background: var(--color-bg-header);
  backdrop-filter: blur(14px);
  border-bottom: var(--border-width) solid var(--color-border);
}

.nav-shell {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: var(--border-width) solid var(--color-border-accent);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
}

.brand-name {
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand-name span {
  color: var(--color-text-muted);
  font-weight: 400;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.site-nav a {
  position: relative;
  padding: 0.45rem 0.7rem;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.site-nav a:hover {
  color: var(--color-text);
}

.site-nav a.is-active {
  color: var(--color-text);
}

.site-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.2rem;
  height: 1px;
  background: var(--color-primary);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  place-items: center;
  gap: 5px;
  flex-direction: column;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 980px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: min(320px, 100%);
    height: calc(100vh - var(--header-height));
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-lg);
    background: var(--color-bg-elevated);
    border-left: var(--border-width) solid var(--color-border);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
  }

  .site-nav.is-open {
    transform: none;
  }

  .site-nav a {
    padding: 0.85rem 0.5rem;
    font-size: var(--fs-md);
  }

  .site-nav a.is-active::after {
    display: none;
  }

  .site-nav a.is-active {
    color: var(--color-primary);
  }
}