/* ==========================================================================
   Navigation Component
   Fixed-position sticky navbar with responsive hamburger menu.
   Uses BEM naming: navbar, navbar__container, navbar__logo, etc.
   ========================================================================== */

/* ---- Navbar Base ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--navbar-height);
  background-color: var(--color-bg-primary);
  z-index: var(--z-navbar);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.navbar--scrolled {
  background-color: rgba(10, 10, 10, 0.92);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ---- Navbar Container ---- */
.navbar__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ---- Navbar Logo ---- */
.navbar__logo {
  display: flex;
  align-items: center;
  height: 100%;
  text-decoration: none;
  flex-shrink: 0;
}

.navbar__logo svg,
.navbar__logo img {
  height: 40px;
  width: auto;
}

/* ---- Hamburger Toggle (Mobile) ---- */
.navbar__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  z-index: calc(var(--z-overlay) + 1);
}

.navbar__toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.navbar__toggle-bar + .navbar__toggle-bar {
  margin-top: 6px;
}

/* Hamburger to X animation when menu is open */
.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.navbar__toggle[aria-expanded="true"] .navbar__toggle-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ---- Mobile Menu (Default: hidden overlay) ---- */
.navbar__menu {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100vh;
  background-color: var(--color-bg-secondary);
  padding: calc(var(--navbar-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  z-index: var(--z-overlay);
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

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

/* ---- Navigation List ---- */
.navbar__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

/* ---- Navigation Links ---- */
.navbar__link {
  display: block;
  padding: var(--space-md) var(--space-md);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
}

.navbar__link:hover,
.navbar__link:focus {
  color: var(--color-accent);
  background-color: var(--color-bg-tertiary);
}

.navbar__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Active page link */
.navbar__link--active {
  color: var(--color-accent);
  font-weight: var(--fw-semibold);
  position: relative;
}

.navbar__link--active::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: var(--space-md);
  right: var(--space-md);
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
}

/* ---- Mobile Menu Overlay Backdrop ---- */
.navbar__overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.navbar__overlay--visible {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   Tablet & Desktop (above 768px)
   ========================================================================== */
@media screen and (min-width: 769px) {
  /* Hide hamburger toggle on desktop */
  .navbar__toggle {
    display: none;
  }

  /* Desktop horizontal navigation */
  .navbar__menu {
    position: static;
    width: auto;
    height: auto;
    background-color: transparent;
    padding: 0;
    transform: none;
    box-shadow: none;
    overflow: visible;
  }

  .navbar__list {
    flex-direction: row;
    align-items: center;
    gap: var(--space-xs);
  }

  .navbar__link {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--fs-small);
    border-radius: var(--radius-sm);
    white-space: nowrap;
  }

  .navbar__link--active::after {
    bottom: 4px;
    left: var(--space-sm);
    right: var(--space-sm);
  }

  /* Hide overlay on desktop */
  .navbar__overlay {
    display: none;
  }

  /* Logo can be slightly larger on desktop */
  .navbar__logo svg,
  .navbar__logo img {
    height: 45px;
  }
}

/* ==========================================================================
   Large Desktop (above 1024px)
   ========================================================================== */
@media screen and (min-width: 1025px) {
  .navbar__link {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--fs-body);
  }

  .navbar__logo svg,
  .navbar__logo img {
    height: 50px;
  }
}

/* ==========================================================================
   Body offset for fixed navbar
   ========================================================================== */
body {
  padding-top: var(--navbar-height);
}

/* ==========================================================================
   Reduced Motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  .navbar__menu {
    transition: none;
  }

  .navbar__toggle-bar {
    transition: none;
  }

  .navbar__overlay {
    transition: none;
  }
}