/* ── Navigation ──────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px var(--edge);
  transition: background var(--dur) var(--ease), padding var(--dur) var(--ease);
}

.nav.scrolled {
  background: rgba(17, 17, 17, 0.96);
  backdrop-filter: blur(8px);
  padding: 14px var(--edge);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--c-white);
  letter-spacing: 6px;
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  gap: 36px;
}

.nav__link {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--c-white);
  text-transform: uppercase;
  letter-spacing: 2.5px;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: currentColor;
  transition: width var(--dur) var(--ease);
}

.nav__link:hover::after { width: 100%; }

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-direction: column;
  gap: 5px;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-white);
  transition: transform var(--dur) var(--ease), opacity var(--dur);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Section base ────────────────────────── */
.section {
  position: relative;
  padding: var(--section-pad) var(--edge);
  overflow: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

/* Large decorative section number in background */
.section-num {
  position: absolute;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(160px, 30vw, 340px);
  line-height: 1;
  top: -0.1em;
  right: var(--edge);
  user-select: none;
  pointer-events: none;
  z-index: 1;
}

/* ── Shared button ───────────────────────── */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  padding: 14px 32px;
  border: 2px solid currentColor;
  border-radius: 2px;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
  cursor: pointer;
}

/* ── Responsive nav ──────────────────────── */
@media (max-width: 768px) {
  .nav__toggle { display: flex; }

  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-dark);
    flex-direction: column;
    padding: 24px var(--edge) 32px;
    gap: 20px;
  }

  .nav__links.open { display: flex; }
}