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

.site-nav {
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-nav-bg);
  border-block-end: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  min-block-size: var(--nav-height);
}

/* ============================================================
   NAV LOGO
   ============================================================ */

.nav-logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-brand-primary);
  white-space: nowrap;
}

.nav-logo:hover {
  color: var(--color-brand-primary-dark);
}

/* ============================================================
   NAV LINKS — hidden on mobile, shown on desktop
   ============================================================ */

.nav-links {
  display: none;
  gap: var(--space-6);
  align-items: center;
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-nav-text);
  padding-block: var(--space-2);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-nav-link-hover);
}

/* Underline indicator — auto-mirrors in RTL via inset-inline-start */
.nav-links a::after {
  content: '';
  position: absolute;
  inset-block-end: 0;
  inset-inline-start: 0;
  inline-size: 0;
  block-size: 2px;
  background-color: var(--color-brand-primary);
  transition: inline-size var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  inline-size: 100%;
}

/* ============================================================
   LANGUAGE SWITCHER — pill buttons
   ============================================================ */

.lang-switcher {
  display: flex;
  gap: var(--space-2);
}

.lang-switcher button {
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: transparent;
  cursor: pointer;
  font-family: var(--font-family-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.lang-switcher button:hover {
  border-color: var(--color-brand-primary);
  color: var(--color-brand-primary);
}

.lang-switcher button.active {
  background-color: var(--color-brand-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-brand-primary);
}

/* ============================================================
   HAMBURGER TOGGLE — visible on mobile only
   ============================================================ */

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: var(--space-2);
  background: none;
  border: none;
  cursor: pointer;
}

@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
}

.hamburger-line {
  display: block;
  inline-size: 24px;
  block-size: 2px;
  background-color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ============================================================
   MOBILE NAV MENU — toggled by JS in Phase 2
   ============================================================ */

.nav-links--mobile-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  inset-block-start: var(--nav-height);
  inset-inline-start: 0;
  inline-size: 100%;
  background-color: var(--color-nav-bg);
  padding: var(--space-4);
  box-shadow: var(--shadow-md);
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .nav-links--mobile-open {
    position: static;
    flex-direction: row;
    inline-size: auto;
    padding: 0;
    box-shadow: none;
    background-color: transparent;
  }
}

/* ============================================================
   BUTTON BASE CLASSES
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-family-body);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-btn-primary-bg);
  color: var(--color-btn-primary-text);
  border-color: var(--color-btn-primary-bg);
}

.btn--primary:hover {
  background-color: var(--color-btn-primary-hover);
  border-color: var(--color-btn-primary-hover);
}

.btn--secondary {
  background-color: var(--color-btn-secondary-bg);
  color: var(--color-btn-secondary-text);
  border-color: var(--color-btn-secondary-border);
}

.btn--secondary:hover {
  background-color: var(--color-btn-secondary-hover);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

/* ============================================================
   SECTION HEADING UTILITIES
   ============================================================ */

.section__heading {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-block-end: var(--space-4);
  color: var(--color-text-primary);
}

.section__subheading {
  font-size: var(--font-size-lg);
  text-align: center;
  color: var(--color-text-secondary);
  margin-block-end: var(--space-12);
  max-inline-size: 600px;
  margin-inline: auto;
}