/* ==========================================================================
   03-COMPONENTS: Navigation
   ========================================================================== */

/* Skip Link for Accessibility */
.c-skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--color-coffee-black);
  color: var(--color-paper-white);
  padding: 0.75rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  z-index: 1000;
  text-decoration: none;
  border: 1px solid var(--color-paper-white);
}

.c-skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--color-coffee-black);
}

/* Desktop Fixed Sidebar */
.c-sidenav {
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  height: 100vh;
  width: var(--sidebar-width);
  background-color: var(--color-paper-white);
  border-right: 1px solid var(--color-outline-variant);
  padding: var(--space-lg) var(--space-md);
  z-index: 100;
}

.c-sidenav__header {
  margin-bottom: var(--space-lg);
}

.c-sidenav__brand-link {
  display: block;
  text-decoration: none;
}

.c-sidenav__brand-link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
}

.c-sidenav__logo {
  display: block;
  width: 100%;
  margin: 0 auto;
  max-width: 150px;
  height: auto;
}

.c-sidenav__brand {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  color: var(--color-primary);
  text-decoration: none;
  display: block;
}

.c-sidenav__tagline {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  color: var(--color-outline-dark);
  text-align: center;
  text-transform: uppercase;
  margin-top: 0.75rem;
}

/* Navigation List & Links */
.c-sidenav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  width: 100%;
}

.c-sidenav__item {
  width: 100%;
}

.c-nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 0;
  border-top: 1px solid var(--color-outline-variant);
  color: var(--color-on-surface-variant);
  text-decoration: none;
  transition: transform 0.2s ease, color 0.2s ease;
}

.c-sidenav__item:last-child .c-nav-link {
  border-bottom: 1px solid var(--color-outline-variant);
}

.c-nav-link:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.c-nav-link:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.c-nav-link.is-active {
  color: var(--color-primary);
  font-weight: 500;
}

.c-nav-link__num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-outline-dark);
}

.c-nav-link__icon {
  width: 1.5em;
}

.c-nav-link__label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.c-sidenav__footer {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-outline-dark);
  line-height: 1.4;
}

.c-mobile-nav {
  display: none;
  padding: 1rem var(--grid-margin);
  background-color: var(--color-paper-white);
  border-bottom: 1px solid var(--color-outline-variant);
  position: sticky;
  top: 0;
  z-index: 90;
}

.c-mobile-nav__logo {
  display: block;
  width: 100px;
  height: auto;
}

@media (max-width: 768px) {
  .c-sidenav {
    display: none;
  }
  .c-mobile-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
}