.resource-layout {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  gap: 2rem;
  width: min(1180px, calc(100vw - 2rem));
  margin: 0 auto;
  align-items: start;
}

.resource-article {
  width: 100%;
  min-width: 0;
}

.resource-nav {
  position: sticky;
  top: calc(var(--nav-height, 64px) + 1rem);
  max-height: calc(100svh - var(--nav-height, 64px) - 2rem);
  overflow: auto;
  padding: 1rem 0.65rem;
  margin-top: 3rem;
  border-right: 1px solid rgba(30, 61, 47, 0.12);
}

.resource-nav__title {
  padding: 0 0.75rem 0.8rem;
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue-color);
}

.resource-nav__group {
  padding: 0.4rem 0 0.85rem;
}

.resource-nav__group h2 {
  margin: 0 0 0.35rem;
  padding: 0 0.75rem;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--font-color);
  opacity: 0.45;
}

.resource-nav__group ul {
  display: grid;
  gap: 0.1rem;
}

.resource-nav__link {
  display: block;
  padding: 0.48rem 0.75rem;
  border-radius: 7px;
  color: var(--font-color);
  font-size: 0.84rem;
  line-height: 1.35;
  opacity: 0.68;
  text-decoration: none;
}

.resource-nav__link:hover {
  background: var(--main-auxiliary);
  color: var(--purple-color);
  opacity: 1;
}

.resource-nav__link--active {
  background: var(--light-blue-color);
  color: var(--purple-color);
  font-weight: 700;
  opacity: 1;
}

.resource-list {
  display: grid;
  gap: 0.55rem;
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  list-style: disc;
  color: var(--ap-text-secondary);
  line-height: 1.65;
}

.resource-list li {
  list-style: disc;
}

body.dark-mode .resource-nav {
  border-right-color: rgba(229, 221, 212, 0.1);
}

/* ── Authenticated: resource nav becomes second fixed sidenav ── */

@media (min-width: 768px) {
  body.has-app-sidenav .resource-layout {
    grid-template-columns: minmax(0, 1fr);
    width: min(900px, calc(100vw - 2rem));
  }

  body.has-app-sidenav .resource-nav {
    position: fixed;
    left: 240px;
    top: 0;
    bottom: 0;
    width: 240px;
    max-height: none;
    margin-top: 0;
    padding: 0 0 16px;
    background: var(--main);
    border-left: 1px solid var(--tertiary);
    border-right: 1px solid var(--tertiary);
    border-top: none;
    border-bottom: none;
    border-radius: 0;
    box-shadow: none;
    z-index: 200;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: none;
  }

  body.has-app-sidenav .resource-nav::-webkit-scrollbar {
    display: none;
  }

  body.has-app-sidenav .resource-nav__title {
    padding: 20px 20px 16px;
    border-bottom: 1px solid var(--tertiary);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--font-color);
    opacity: 0.42;
    margin-bottom: 0;
  }

  body.has-app-sidenav .resource-nav__group {
    padding: 12px 0 4px;
  }

  body.has-app-sidenav .resource-nav__group + .resource-nav__group {
    border-top: 1px solid var(--tertiary);
    margin-top: 4px;
    padding-top: 8px;
  }

  body.has-app-sidenav .resource-nav__group h2 {
    padding: 0 20px 6px;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--font-color);
    opacity: 0.42;
    margin: 0;
  }

  body.has-app-sidenav .resource-nav__group ul {
    gap: 0;
  }

  body.has-app-sidenav .resource-nav__link {
    display: block;
    padding: 9px 20px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--font-color);
    border-left: 2px solid transparent;
    border-radius: 0;
    opacity: 1;
    line-height: 1.35;
    transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease;
  }

  body.has-app-sidenav .resource-nav__link:hover {
    background: var(--main-auxiliary);
    color: var(--purple-color);
    border-radius: 0;
    opacity: 1;
  }

  body.has-app-sidenav .resource-nav__link--active {
    color: var(--purple-color);
    font-weight: 600;
    background: var(--light-blue-color);
    border-left-color: var(--purple-color);
    border-radius: 0;
    opacity: 1;
  }
}

@media (max-width: 860px) {
  .resource-layout {
    display: block;
    width: min(940px, calc(100vw - 1.5rem));
  }

  .resource-nav {
    position: relative;
    top: auto;
    max-height: none;
    margin: 1rem auto 0;
    padding: 0.85rem;
    border: 1px solid rgba(30, 61, 47, 0.12);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.52);
  }

  .resource-nav__group {
    padding-bottom: 0.55rem;
  }
}