.app-shell {
  position: relative;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 18px 22px;
  background:
    linear-gradient(180deg, rgba(22, 14, 14, 0.98), rgba(8, 7, 7, 0.98)),
    url("../assets/newsheadline_background.gif"),
    url("../media/newsheadline_background.gif");
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 22px;
  z-index: 20;
}

.page-shell {
  min-width: 0;
  padding: 18px 18px 24px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 18;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0 18px;
  backdrop-filter: blur(12px);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--rail-width);
  gap: 18px;
  align-items: start;
}

.main-column,
.right-rail {
  min-width: 0;
}

.main-column {
  display: grid;
  gap: 16px;
}

.right-rail {
  display: grid;
  gap: 16px;
  position: sticky;
  top: 84px;
}

.content-view {
  min-height: 65vh;
}

.app-footer {
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 24px;
  padding: 18px 24px 8px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 1200px) {
  .workspace {
    grid-template-columns: minmax(0, 1fr);
  }

  .right-rail {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    box-shadow: var(--shadow-lg);
    width: min(86vw, 320px);
  }

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

  .mobile-only,
  .icon-button.mobile-only {
    display: inline-flex;
  }

  .page-shell {
    padding: 14px;
  }

  .topbar {
    padding-top: 0;
  }

  .right-rail {
    grid-template-columns: 1fr;
  }
}