/* ============================================
   TMT THEME — NAVIGATION
   File: assets/css/navigation.css
   ============================================ */

/* ----------------------------------------
   Site Header
   ---------------------------------------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding-block: 1.25rem;
  background-color: transparent;
  transition: background-color 0.4s ease,
              backdrop-filter 0.4s ease,
              border-bottom-color 0.4s ease,
              padding 0.4s ease;
  border-bottom: 1px solid transparent;
}

/* Scrolled state — added via JS */
.site-header.is-scrolled {
  background-color: rgba(15, 15, 15, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--color-border);
  padding-block: 0.875rem;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* ----------------------------------------
   Logo
   ---------------------------------------- */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: var(--weight-bold);
  color: var(--color-text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}
.site-logo:hover {
  opacity: 0.85;
}
.site-logo span {
  color: var(--color-accent);
}
.site-logo img {
  height: 2rem;
  width: auto;
}

/* ----------------------------------------
   Primary Navigation
   ---------------------------------------- */
.primary-nav {
  display: flex;
  align-items: center;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.primary-nav__item {
  position: relative;
}

.primary-nav__link {
  display: block;
  padding: 0.5rem 0.875rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-fast),
              background-color var(--transition-fast);
}
.primary-nav__link:hover,
.primary-nav__link:focus-visible,
.primary-nav__item.current-menu-item .primary-nav__link {
  color: var(--color-text-primary);
  background-color: rgba(255,255,255,0.05);
}
.primary-nav__item.current-menu-item .primary-nav__link {
  color: var(--color-accent);
  background-color: rgba(168, 218, 220, 0.07);
}

/* ----------------------------------------
   Header CTA
   ---------------------------------------- */
.header-cta {
  flex-shrink: 0;
}

/* ----------------------------------------
   Mobile Menu Toggle
   ---------------------------------------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  gap: 5px;
  width: 2.25rem;
  height: 2.25rem;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.25rem;
  border-radius: var(--border-radius-sm);
  transition: background-color var(--transition-fast);
}
.nav-toggle:hover {
  background-color: rgba(255,255,255,0.06);
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: width var(--transition-base),
              transform var(--transition-base),
              opacity var(--transition-base);
}
.nav-toggle__bar:nth-child(1) { width: 22px; }
.nav-toggle__bar:nth-child(2) { width: 16px; }
.nav-toggle__bar:nth-child(3) { width: 22px; }

/* Toggle open state */
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  width: 22px;
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  width: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  width: 22px;
  transform: translateY(-7px) rotate(-45deg);
}

/* ----------------------------------------
   Mobile Navigation
   ---------------------------------------- */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg-secondary);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-smooth);
  }

  .primary-nav.is-open {
    opacity: 1;
    pointer-events: all;
  }

  .primary-nav__list {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }

  .primary-nav__link {
    font-size: 1.5rem;
    font-family: var(--font-heading);
    font-weight: var(--weight-semibold);
    padding: 0.75rem 2rem;
  }

  .header-cta {
    margin-top: var(--space-8);
  }
}

/* ----------------------------------------
   Footer Nav
   ---------------------------------------- */
.footer-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav__link {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.footer-nav__link:hover {
  color: var(--color-accent);
}

/* Hide desktop CTA on mobile — it's duplicated inside mobile nav overlay */
@media (max-width: 768px) {
  .header-cta--desktop {
    display: none;
  }
}