/* ==========================================================================
   Nav — header, hamburger, slide-in menu panel, overlay, active states
   ========================================================================== */

/* --- Header bar --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height-mobile);
  display: flex;
  align-items: center;
}

@media (min-width: 768px) {
  .site-header { height: var(--nav-height-tablet); }
}

@media (min-width: 1200px) {
  .site-header { height: var(--nav-height-desktop); }
}

.nav {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--page-x-mobile);
}

@media (min-width: 768px) {
  .nav { padding: 0 var(--page-x-tablet); }
}

@media (min-width: 1200px) {
  .nav {
    padding: 0 var(--page-x-desktop);
    max-width: 1440px;
    margin: 0 auto;
  }
}

/* --- Logo --- */
.nav__logo {
  display: block;
  flex-shrink: 0;
}

.nav__logo img {
  height: 2rem;
  width: auto;
}

@media (min-width: 768px) {
  .nav__logo img { height: 2.25rem; }
}

/* --- Desktop nav links (hidden on mobile/tablet) --- */
.nav__links {
  display: none;
}

@media (min-width: 1200px) {
  .nav__links {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    list-style: none;
  }

  .nav__link {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--color-text-heading);
    text-decoration: none;
    padding: 0.25rem 0;
    position: relative;
    transition: color 0.15s ease;
  }

  .nav__link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-navy);
    border-radius: 1px;
    transition: width 0.2s ease;
  }

  .nav__link:hover { color: var(--color-navy); }
  .nav__link:hover::after { width: 100%; }

  .nav__link--active {
    color: var(--color-navy);
    font-weight: 700;
  }

  .nav__link--active::after { width: 100%; }
}

/* --- Desktop CTA button --- */
.nav__cta {
  display: none;
}

@media (min-width: 1200px) {
  .nav__cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 2.6rem;
    padding: 0 1.25rem;
    border-radius: var(--radius-btn);
    background: var(--color-navy);
    color: var(--color-white);
    font-size: var(--text-base);
    font-weight: 700;
    text-decoration: none;
    transition: opacity 0.15s ease;
    white-space: nowrap;
  }

  .nav__cta:hover { opacity: 0.85; }
}

/* --- Hamburger button (visible on mobile + tablet) --- */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav__hamburger span {
  display: block;
  width: 1.5rem;
  height: 2px;
  background: var(--color-text-heading);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

/* Animate hamburger → X when open */
.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (min-width: 1200px) {
  .nav__hamburger { display: none; }
}

/* --- Overlay --- */
.nav__overlay {
  position: fixed;
  inset: 0;
  z-index: 110;
  background: var(--color-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-menu);
}

.nav__overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

/* --- Slide-in menu panel --- */
.nav__panel {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 120;
  width: var(--menu-width-mobile);
  max-width: 85vw;
  height: 100%;
  background: var(--color-white);
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition-menu);
  overflow-y: auto;
}

@media (min-width: 768px) {
  .nav__panel { width: var(--menu-width-tablet); }
}

.nav__panel.is-open {
  transform: translateX(0);
}

@media (min-width: 1200px) {
  /* Panel never shown on desktop */
  .nav__panel,
  .nav__overlay { display: none; }
}

/* --- Panel header (logo + close) --- */
.nav__panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem var(--page-x-mobile);
  border-bottom: 1px solid var(--color-border);
  min-height: var(--nav-height-mobile);
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .nav__panel-header {
    padding: 1.5rem var(--page-x-tablet);
    min-height: var(--nav-height-tablet);
  }
}

.nav__panel-logo img {
  height: 2rem;
  width: auto;
}

.nav__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav__close img {
  width: 1.125rem;
  height: 1.125rem;
}

/* --- Panel nav items --- */
.nav__panel-links {
  flex: 1;
  padding: 1.5rem var(--page-x-mobile);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

@media (min-width: 768px) {
  .nav__panel-links { padding: 1.5rem var(--page-x-tablet); }
}

.nav__panel-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-heading);
  text-decoration: none;
  position: relative;
  transition: color 0.15s ease;
}

.nav__panel-link:last-child {
  border-bottom: none;
}

.nav__panel-link:hover {
  color: var(--color-navy);
}

/* Active dot indicator */
.nav__panel-link--active {
  color: var(--color-navy);
  font-weight: 700;
}

.nav__panel-link--active::after {
  content: '';
  display: block;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-orange);
  flex-shrink: 0;
}

/* --- Panel CTA --- */
.nav__panel-cta {
  padding: 1.5rem var(--page-x-mobile);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .nav__panel-cta { padding: 1.5rem var(--page-x-tablet); }
}

.nav__panel-cta .btn {
  width: 100%;
}