.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 700;
  white-space: nowrap;
}

.search-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
}

.search-wrap input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  background: var(--surface);
}

.read-progress {
  position: sticky;
  top: 64px;
  z-index: 35;
  height: 4px;
  background: transparent;
}

#read-progress-fill {
  width: 0;
  height: 100%;
  background: var(--brand);
  transition: width 120ms linear;
}

.app-grid {
  display: block;
  padding: var(--space-4);
}

.left-rail,
.right-rail {
  display: none;
}

.content-column {
  max-width: 900px;
  margin: 0 auto;
}

.home-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding: var(--space-4);
  max-width: 1200px;
  margin: 0 auto;
}

.search-page {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-4);
}

@media (min-width: 1024px) {
  body {
    padding-bottom: 0;
  }

  .app-grid {
    display: grid;
    grid-template-columns: 264px minmax(760px, 860px) 300px;
    gap: var(--space-4);
    align-items: start;
    max-width: 1480px;
    margin: 0 auto;
    padding: var(--space-4);
  }

  .left-rail,
  .right-rail {
    display: block;
    position: sticky;
    top: 112px;
    max-height: calc(100vh - 132px);
    overflow: auto;
  }

  .home-grid {
    grid-template-columns: 1.5fr 1fr;
  }

  .hero-card {
    grid-column: 1 / -1;
  }
}