/* ============================================================
   Brandão Torres Construtora — Navegação: topbar fixa e menu mobile
   Ordem de carregamento: 2 de 7 (não altere a ordem dos <link>
   no index.html — a cascata do CSS depende dela).
   ============================================================ */

/* ---------- nav ---------- */
nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  transition: background .4s ease, border-color .4s ease;
  border-bottom: 1px solid transparent;
}

nav.scrolled {
  background: rgba(19, 19, 19, .82);
  backdrop-filter: blur(14px);
  border-color: var(--line)
}

.nav-in {
  width: min(1240px, 92vw);
  margin: 0 auto;
  height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo img {
  height: 40px;
  width: auto
}

.nav-links {
  display: flex;
  gap: 34px;
  align-items: center
}

.nav-links a {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mist);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 100%;
  background: var(--sage);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform .35s ease;
}

.nav-links a:hover {
  color: var(--paper)
}

.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: .12em;
  text-transform: uppercase;
  padding: 13px 22px;
  border: 1px solid var(--line);
  color: var(--paper);
  transition: .35s ease;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  cursor: pointer;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--sage);
  z-index: -1;
  transform: translateY(101%);
  transition: transform .38s cubic-bezier(.65, 0, .35, 1);
}

.btn:hover {
  color: var(--ink);
  border-color: var(--sage)
}

.btn:hover::before {
  transform: none
}

.btn:hover svg {
  stroke: var(--ink)
}

.btn svg {
  transition: .35s ease
}

.btn.solid {
  background: var(--sage);
  color: var(--ink);
  border-color: var(--sage)
}

.btn.solid::before {
  background: var(--paper)
}

.btn.solid:hover {
  border-color: var(--paper)
}

.burger {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
  z-index: 60
}

.burger span {
  display: block;
  width: 26px;
  height: 1.6px;
  background: var(--paper);
  margin: 6px 0;
  transition: .35s ease
}