.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  transition: background 0.4s var(--ease-out), backdrop-filter 0.4s;
}

.nav.scrolled {
  background: rgba(6, 6, 10, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.75rem;
  letter-spacing: 0.15em;
  background: linear-gradient(135deg, var(--text), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links { display: flex; gap: 2.5rem; }

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color 0.3s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s var(--ease-out);
}

.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
}

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem 2rem 2rem;
  background: rgba(6, 6, 10, 0.95);
  border-bottom: 1px solid var(--border);
}

.nav-mobile.open { display: flex; }

.section {
  position: relative;
  padding: calc(var(--nav-height) + 4rem) 2rem 6rem;
  max-width: 1280px;
  margin: 0 auto;
}

.page-header {
  max-width: 1280px;
  margin: 0 auto;
  padding: calc(var(--nav-height) + 4rem) 2rem 2rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 1rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
  max-width: 20ch;
}

.section-sub {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
  max-width: 60ch;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-inner p { color: var(--text-muted); font-size: 0.85rem; }
.footer-links { display: flex; gap: 2rem; }
.footer-links a { font-size: 0.8rem; color: var(--text-muted); transition: color 0.3s; }
.footer-links a:hover { color: var(--text); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .section, .page-header { padding-left: 1.25rem; padding-right: 1.25rem; }
}