/* ============================================================
   NAVIGATION — nav.css
   ============================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: background 0.4s, backdrop-filter 0.4s, border-color 0.4s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10, 12, 15, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: var(--color-border);
}
.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}
.nav-logo-bracket {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-2);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 100%;
  height: 1px;
  background: var(--color-accent);
  transition: right 0.3s var(--ease-snap);
}
.nav-links a:hover,
.nav-links a.active { color: var(--color-accent); }
.nav-links a:hover::after,
.nav-links a.active::after { right: 0; }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid var(--color-border-bright);
  padding: 0.45rem 1rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}
.nav-cta:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  opacity: 1;
}

/* ── Hamburger button ── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
  width: 40px;
  height: 40px;
  z-index: 1001;
  position: relative;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
  transform-origin: center;
}
.nav-hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
  width: 0;
}
.nav-hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile drawer ── */
.nav-mobile {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(8, 10, 13, 0.99);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: var(--space-xl) var(--space-xl);
  gap: 0;
  /* Hidden state */
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.23, 1, 0.32, 1);
  overflow-y: auto;
}
.nav-mobile.open {
  transform: translateX(0);
}
.nav-mobile a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-2);
  text-decoration: none;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color 0.2s, padding-left 0.2s;
  display: block;
}
.nav-mobile a:hover {
  color: var(--color-accent);
  padding-left: var(--space-sm);
}
.nav-mobile a:last-child {
  border-bottom: none;
  margin-top: var(--space-md);
}

/* ── Responsive breakpoints ── */
@media (max-width: 900px) {
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
  .nav-inner { padding: 0 var(--space-lg); }
}
@media (max-width: 480px) {
  .nav-inner { padding: 0 var(--space-md); }
  .nav-mobile { padding: var(--space-lg) var(--space-md); }
}