/* ============================================================
   NAV.CSS — BachatAI Navbar
   ============================================================ */

/* ── NAVBAR SHELL ─────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);

  /* Starts fully transparent — JS adds .scrolled class */
  background: transparent;
  transition: background var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out),
              border-color var(--duration-base) var(--ease-out);

  border-bottom: 1px solid transparent;
}

/* Scrolled state — white bg + soft shadow */
#navbar.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--color-border),
              var(--shadow-sm);
  border-bottom-color: var(--color-border);
}

/* ── INNER LAYOUT ─────────────────────────────────────────── */
.nav-inner {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

/* ── LOGO ─────────────────────────────────────────────────── */
.nav-logo {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--color-navy);
  letter-spacing: -0.03em;
  flex-shrink: 0;
  transition: opacity var(--duration-fast);
}

.nav-logo:hover {
  opacity: 0.75;
}

.nav-logo-accent {
  color: var(--color-green);
}

/* ── CENTER LINKS ─────────────────────────────────────────── */
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}

.nav-link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-navy);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  transition: background var(--duration-fast),
              color var(--duration-fast);
  opacity: 0.7;
}

.nav-link:hover {
  background: var(--color-surface);
  opacity: 1;
}

.nav-link.active {
  opacity: 1;
  font-weight: 600;
}

/* ── RIGHT SIDE ───────────────────────────────────────────── */
.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.nav-cta {
  padding: 10px 24px;
  font-size: var(--text-sm);
}

/* ── HAMBURGER (mobile) ───────────────────────────────────── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0;
}

.nav-hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-navy);
  border-radius: 2px;
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast);
  transform-origin: center;
}

/* Hamburger → X animation */
#navbar.menu-open .nav-hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
#navbar.menu-open .nav-hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
#navbar.menu-open .nav-hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── MOBILE DRAWER ────────────────────────────────────────── */
.nav-drawer {
  position: absolute;
  top: var(--nav-height);
  left: 0; right: 0;

  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-md);

  /* Hidden by default */
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--duration-slow) var(--ease-out);
}

#navbar.menu-open .nav-drawer {
  max-height: 400px;
}

.nav-drawer-links {
  display: flex;
  flex-direction: column;
  padding: 16px 24px 24px;
  gap: 4px;
}

.nav-drawer-link {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  color: var(--color-navy);
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  opacity: 0.8;
  transition: opacity var(--duration-fast),
              color var(--duration-fast);
}

.nav-drawer-link:hover {
  opacity: 1;
  color: var(--color-green);
}

.nav-drawer-cta {
  margin-top: 16px;
  width: 100%;
  text-align: center;
  padding: 14px;
}

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  /* On mobile, hide desktop CTA — it's in the drawer */
  .nav-cta {
    display: none;
  }
}