/* ============================================================
   NAVBAR
   Animation concept: scaleX underline (from MPINavbar component)
   ============================================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding-block: var(--space-4);
  transition: background var(--transition-base),
              box-shadow var(--transition-base),
              padding var(--transition-base);
}

.navbar.transparent {
  background: linear-gradient(
    to bottom,
    rgba(20, 20, 18, 0.65) 0%,
    rgba(20, 20, 18, 0.0) 100%
  );
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  padding-block: var(--space-3);
}

.navbar__inner {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) auto minmax(140px, 1fr);
  align-items: center;
  gap: var(--space-6);
}

.navbar__right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  justify-self: end;
}

/* --- Logo --- */
.navbar__logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-white);
  letter-spacing: -0.02em;
  transition: color var(--transition-fast);
  flex-shrink: 0;
  text-decoration: none;
}

.navbar.scrolled .navbar__logo {
  color: var(--color-primary);
}

.navbar__logo span span {
  color: var(--color-secondary);
}

/* --- Nav links --- */
.navbar__links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

/* Link base — force color in all states */
.navbar__links a,
.navbar__links a:visited,
.navbar__links a:hover,
.navbar__links a:focus,
.navbar__links a:active {
  position: relative;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  padding-block: 0.15rem;
  transition: color var(--transition-fast);
}

/* scaleX underline — the key animation */
.navbar__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 2px;
  background: var(--color-secondary);
  border-radius: var(--radius-full);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-base);
}

.navbar__links a:hover::after,
.navbar__links a.active::after {
  transform: scaleX(1);
}

/* Scrolled state: dark text */
.navbar.scrolled .navbar__links a,
.navbar.scrolled .navbar__links a:visited {
  color: var(--color-text-muted);
}

.navbar.scrolled .navbar__links a:hover {
  color: var(--color-primary);
}

/* --- CTA button in navbar --- */
.navbar__cta {
  display: none;
}

/* --- Burger button --- */
.navbar__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.navbar.scrolled .navbar__burger {
  border-color: var(--color-border);
}

.navbar__burger span {
  display: block;
  height: 2px;
  background: var(--color-white);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base),
              opacity var(--transition-base),
              background var(--transition-fast);
}

.navbar.scrolled .navbar__burger span {
  background: var(--color-text);
}

.navbar__burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.navbar__burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.navbar__burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Mobile menu (slide from right) --- */
.navbar__mobile {
  position: fixed;
  inset: 0;
  top: 64px;
  background: var(--color-white);
  padding: var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  z-index: var(--z-dropdown);
  display: flex;
  flex-direction: column;
  gap: 0;
  box-shadow: var(--shadow-lg);
  overflow-y: auto;
}

.navbar__mobile.open {
  transform: translateX(0);
}

.navbar__mobile a {
  position: relative;
  font-size: var(--text-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-decoration: none;
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

/* scaleX underline on mobile links too */
.navbar__mobile a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--color-secondary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-base);
}

.navbar__mobile a:hover {
  color: var(--color-primary);
}

.navbar__mobile a:hover::after,
.navbar__mobile a.active::after {
  transform: scaleX(1);
}

.navbar__mobile .btn {
  margin-top: var(--space-6);
}

/* --- Scroll-to-top button --- */
.scroll-top-btn {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  background: var(--color-secondary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-toast);

  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity var(--transition-fast),
              transform var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.scroll-top-btn.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.scroll-top-btn:hover {
  background: var(--color-secondary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.scroll-top-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

/* --- Desktop show/hide --- */
@media (min-width: 768px) {
  .navbar__links  { display: flex; }
  .navbar__cta    { display: inline-flex; }
  .navbar__burger { display: none; }
}