.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--torq-black);
  transition:
    background 0.45s var(--ease),
    border-color 0.45s var(--ease),
    box-shadow 0.45s var(--ease),
    backdrop-filter 0.45s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(10, 10, 10, 0.82);
  backdrop-filter: blur(18px) saturate(1.2);
  border-bottom: 1px solid rgba(201, 162, 39, 0.12);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 100%;
  width: min(1280px, calc(100% - 2rem));
  margin: 0 auto;
}

.nav__brand {
  flex-shrink: 0;
}

.nav__logo {
  height: 2rem;
  width: auto;
  filter: brightness(0) invert(1);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2.5vw, 2.25rem);
  list-style: none;
}

.nav__link {
  position: relative;
  padding: 0.35rem 0;
  color: var(--torq-muted);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transition: color 0.3s var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--torq-accent);
  transition: width 0.35s var(--ease);
}

.nav__link:hover,
.nav__link:focus-visible,
.nav__link.is-active {
  color: var(--torq-ink);
}

.nav__link:hover::after,
.nav__link:focus-visible::after,
.nav__link.is-active::after {
  width: 100%;
}

.nav__cta {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.65rem 1.25rem;
  background: var(--torq-accent);
  color: var(--torq-black);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: background 0.35s var(--ease), color 0.35s var(--ease);
}

.nav__cta:hover,
.nav__cta:focus-visible {
  background: var(--torq-accent-hover);
  color: var(--torq-black);
}

.nav__toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
}

.nav__toggle-bar {
  position: absolute;
  left: 50%;
  width: 1.15rem;
  height: 1px;
  background: var(--torq-ink);
  transform: translateX(-50%);
  transition: transform 0.35s var(--ease), opacity 0.25s var(--ease), top 0.35s var(--ease);
}

.nav__toggle-bar:nth-child(1) { top: 0.9rem; }
.nav__toggle-bar:nth-child(2) { top: 1.23rem; }
.nav__toggle-bar:nth-child(3) { top: 1.56rem; }

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  top: 1.23rem;
  transform: translateX(-50%) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  top: 1.23rem;
  transform: translateX(-50%) rotate(-45deg);
}

.nav__drawer {
  display: none;
}

@media (max-width: 900px) {
  .nav__toggle {
    display: block;
  }

  .nav__links,
  .nav__cta {
    display: none;
  }

  .nav__drawer {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 90;
    padding: 2rem 1.5rem;
    background: var(--torq-black);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-0.5rem);
    transition: opacity 0.4s var(--ease), visibility 0.4s var(--ease), transform 0.4s var(--ease);
  }

  .nav__drawer.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .nav__drawer-links {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    list-style: none;
  }

  .nav__drawer-links a {
    display: block;
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: var(--torq-ink);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
  }

  .nav__drawer-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 3rem;
    width: 100%;
    background: var(--torq-accent);
    color: var(--torq-black);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
  }
}