/* ── Header ── */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  transition: background var(--transition), backdrop-filter var(--transition), border-color var(--transition);
}

.header.scrolled {
  background: rgba(12, 17, 23, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.logo-mark {
  width: 28px;
  height: 28px;
  border: 2px solid var(--accent-cyan);
  border-radius: 4px;
  position: relative;
}

.logo-mark::after {
  content: '';
  position: absolute;
  inset: 5px;
  border: 1px dashed var(--accent-cyan);
  opacity: 0.6;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.nav-links a:hover { color: var(--text-primary); }

.nav-cta {
  padding: 0.55rem 1.2rem;
  background: var(--accent-cyan-dim);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--accent-cyan) !important;
}

.nav-cta:hover {
  background: rgba(45, 212, 191, 0.25);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 4px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle.active span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle.active span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* ── Sections ── */
.section {
  position: relative;
  z-index: 1;
  padding: 5rem 0;
}

.section-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-amber);
  margin-bottom: 0.75rem;
}

.section-header {
  margin-bottom: 3rem;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 600;
  line-height: 1.2;
  max-width: 28rem;
}

/* ── Footer ── */
.footer {
  position: relative;
  z-index: 1;
  padding: 3rem 0 2rem;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 1.5rem 2rem;
}

.footer-brand p {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  align-self: start;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--text-primary); }

.footer-copy {
  grid-column: 1 / -1;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}