/* cz-header — navegação minimalista com divisor energizado e menu acessível no mobile
   Estrutura: header.cz-header > .cz-header__inner > .cz-header__brand + button.cz-header__toggle + nav.cz-header__nav
   Comportamento: cz-header.js (aria-expanded, Esc fecha, clique fora fecha) */

.cz-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  background: color-mix(in srgb, var(--cz-bg) 82%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.cz-header::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cz-cyan) 30%, var(--cz-violet) 70%, transparent);
  opacity: 0.7;
}

.cz-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--cz-space-6);
  min-height: var(--cz-header-height);
  max-width: var(--cz-container);
  margin-inline: auto;
  padding-inline: var(--cz-gutter);
}

.cz-header__brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--cz-space-2);
  color: var(--cz-cyan-soft);
  text-decoration: none;
  font-family: var(--cz-font-display);
  font-size: var(--cz-text-lg);
  font-weight: 700;
  letter-spacing: 0.2em;
  text-shadow: var(--cz-text-glow);
}
.cz-header__brand small {
  font-family: var(--cz-font-mono);
  font-size: 0.55em;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--cz-muted);
  text-shadow: none;
}

.cz-header__nav ul {
  display: flex;
  align-items: center;
  gap: var(--cz-space-1);
  margin: 0;
  padding: 0;
  list-style: none;
}
.cz-header__nav a {
  position: relative;
  display: block;
  padding: var(--cz-space-2) var(--cz-space-3);
  color: var(--cz-muted);
  font-family: var(--cz-font-mono);
  font-size: var(--cz-text-xs);
  letter-spacing: var(--cz-tracking-label);
  text-transform: uppercase;
  text-decoration: none;
}
.cz-header__nav a::after {
  content: "";
  position: absolute;
  left: var(--cz-space-3);
  right: var(--cz-space-3);
  bottom: 2px;
  height: 1px;
  background: var(--cz-cyan);
  box-shadow: var(--cz-glow);
  transform: scaleX(0);
  transition: transform var(--cz-duration-base) var(--cz-ease);
}
.cz-header__nav a:hover,
.cz-header__nav a[aria-current="page"] { color: var(--cz-text-strong); }
.cz-header__nav a:hover::after,
.cz-header__nav a[aria-current="page"]::after { transform: scaleX(1); }

.cz-header__toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: var(--cz-stroke) solid var(--cz-border);
  border-radius: var(--cz-radius-sm);
  background: transparent;
  color: var(--cz-cyan);
  cursor: pointer;
}
.cz-header__toggle span,
.cz-header__toggle span::before,
.cz-header__toggle span::after {
  display: block;
  width: 18px;
  height: 1.5px;
  margin-inline: auto;
  background: currentColor;
  transition: transform var(--cz-duration-base) var(--cz-ease), opacity var(--cz-duration-fast);
}
.cz-header__toggle span { position: relative; }
.cz-header__toggle span::before,
.cz-header__toggle span::after { content: ""; position: absolute; left: 0; }
.cz-header__toggle span::before { top: -6px; }
.cz-header__toggle span::after { top: 6px; }
.cz-header__toggle[aria-expanded="true"] span { background: transparent; }
.cz-header__toggle[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.cz-header__toggle[aria-expanded="true"] span::after { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 760px) {
  .cz-header__toggle { display: inline-grid; place-items: center; }
  .cz-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: var(--cz-space-4) var(--cz-gutter) var(--cz-space-6);
    background: color-mix(in srgb, var(--cz-bg) 96%, transparent);
    border-bottom: var(--cz-stroke) solid var(--cz-border);
  }
  .cz-header__nav[data-open="false"] { display: none; }
  .cz-header__nav ul { flex-direction: column; align-items: stretch; }
  .cz-header__nav a { padding-block: var(--cz-space-3); }
}