/* ========================================
   Header & Navegação
   ======================================== */

.header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(251, 250, 247, 0);
  transition: background var(--t-base), height var(--t-base), box-shadow var(--t-base), backdrop-filter var(--t-base);
}
.header.is-scrolled {
  height: var(--header-h-scrolled);
  background: rgba(251, 250, 247, 0.88);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  box-shadow: 0 1px 0 var(--color-line);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  width: 100%;
}

/* ---- Logo ---- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  transition: color var(--t-base);
  flex-shrink: 0;
}
.header.is-scrolled .logo { color: var(--color-ink); }

.logo__mark {
  display: grid;
  place-items: center;
  width: 36px; height: 36px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 10px;
  box-shadow: var(--shadow-accent);
}
.logo__text {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.logo__text span {
  font-weight: 400;
  opacity: 0.7;
}

/* ---- Nav ---- */
.nav {
  display: flex;
  align-items: center;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.5vw, 1.75rem);
}
.nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 4px;
  color: rgba(255,255,255,0.92);
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: color var(--t-base);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 4px; right: 4px; bottom: 2px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--t-base);
}
.nav__link:hover::after { transform: scaleX(1); transform-origin: left; }
.header.is-scrolled .nav__link { color: var(--color-ink-soft); }
.header.is-scrolled .nav__link:hover { color: var(--color-ink); }

.nav__close { display: none; }

/* ---- Header Actions ---- */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border-radius: 10px;
  transition: background var(--t-base);
}
.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--t-base), background var(--t-base);
}
.header.is-scrolled .nav__toggle span { background: var(--color-ink); }