/* ========================================================================
   NAVIGATION
   ======================================================================== */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  height: 68px;
  display: flex;
  align-items: center;
  transition: background var(--t-base-t), backdrop-filter var(--t-base-t),
              border-color var(--t-base-t), height var(--t-base-t);
  border-bottom: 1px solid transparent;
}

.nav.is-scrolled {
  background: rgba(6, 14, 26, 0.78);
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
  border-bottom-color: var(--c-border);
  height: 60px;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  gap: var(--sp-8);
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  flex-shrink: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--c-white);
}
.nav__logo img { height: 32px; width: auto; filter: drop-shadow(0 0 12px rgba(83,192,184,0.25)); }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.nav__link {
  display: inline-block;
  padding: 0.5rem 0.85rem;
  font-size: var(--t-sm);
  color: var(--c-text-muted);
  font-weight: 500;
  border-radius: var(--r-md);
  transition: color var(--t-fast), background var(--t-fast);
  position: relative;
}
.nav__link:hover { color: var(--c-white); background: rgba(255,255,255,0.04); }

.nav__cta {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  flex-shrink: 0;
}

/* Mobile burger — sits ABOVE the drawer so the X stays clickable */
.nav__burger {
  display: none;
  position: relative;
  z-index: calc(var(--z-nav) + 2);
  width: 44px; height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--r-md);
  border: 1px solid var(--c-border-bright);
  background: rgba(11, 22, 38, 0.85);
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast);
}
.nav__burger span {
  width: 18px; height: 2px;
  background: var(--c-white);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
  transform-origin: center;
}
.nav__burger:hover { background: rgba(255,255,255,0.06); }
.nav__burger.is-open {
  background: rgba(83, 192, 184, 0.12);
  border-color: rgba(83, 192, 184, 0.6);
}
.nav__burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ──────────────────────────────────────────────────────────────────
   Mobile drawer — full-screen, fully opaque takeover.
   No backdrop-filter (stacks badly over the nav's own blur on iOS).
   Solid layered gradient + accent glow + crisp content.
   ────────────────────────────────────────────────────────────────── */
.nav__drawer {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) + 1);
  background:
    radial-gradient(circle at 85% 0%, rgba(83, 192, 184, 0.18), transparent 55%),
    radial-gradient(circle at 0% 100%, rgba(54, 120, 174, 0.18), transparent 55%),
    linear-gradient(180deg, #060E1A 0%, #04091A 100%);
  display: flex;
  flex-direction: column;
  padding: calc(68px + var(--sp-8)) var(--gutter) var(--sp-8);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: opacity 0.32s var(--t-ease-out),
              transform 0.32s var(--t-ease-out),
              visibility 0s 0.32s;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.nav__drawer.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.32s var(--t-ease-out),
              transform 0.32s var(--t-ease-out),
              visibility 0s 0s;
}

/* Subtle noise overlay inside drawer for depth */
.nav__drawer::before {
  content: '';
  position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  opacity: 0.04;
  pointer-events: none;
  mix-blend-mode: overlay;
}

.nav__drawer ul {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 0;
  position: relative;
  z-index: 1;
}
.nav__drawer-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sp-5) 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 1.4rem + 2vw, 2.5rem);
  color: var(--c-white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
  transition: color var(--t-fast), padding-left var(--t-fast);
}
.nav__drawer-link::after {
  content: '→';
  color: var(--c-accent);
  font-size: 1.4rem;
  opacity: 0.5;
  transform: translateX(0);
  transition: transform var(--t-fast), opacity var(--t-fast);
}
.nav__drawer-link:active,
.nav__drawer-link:hover {
  color: var(--c-accent);
  padding-left: var(--sp-2);
}
.nav__drawer-link:active::after,
.nav__drawer-link:hover::after {
  opacity: 1;
  transform: translateX(4px);
}

.nav__drawer-cta {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-10);
  position: relative;
  z-index: 1;
}

@media (max-width: 900px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: flex; }
}

/* When the drawer is open, hide the nav's scroll-state background so the
   takeover feels seamless — the drawer brings its own background. */
body.nav-open .nav,
body.nav-open .nav.is-scrolled {
  background: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  border-bottom-color: transparent;
}