@media (max-width: 1120px) {
  .homepage-grid {
    gap: 22px;
  }

  .story-card--stream {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .story-card--channel-lead {
    grid-template-columns: minmax(0, 1fr);
  }

  .story-card--channel-lead.story-card--with-media {
    grid-template-columns: 104px minmax(0, 1fr);
  }
}

@media (max-width: 1023px) {
  .header-shell {
    grid-template-columns: minmax(0, 1fr) auto auto;
  }

  .menu-button {
    display: inline-flex;
  }

  .channel-menu {
    position: absolute;
    top: 52px;
    right: 0;
    left: 0;
    z-index: 2;
    padding-inline: 16px;
    border-block: 1px solid var(--fuel-line);
    background: #fff;
  }

  .channel-nav a {
    min-height: 40px;
  }

  .homepage-grid.home-layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "main" "channels";
  }

  .portal-rail {
    display: none;
  }

  .story-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .evidence-panel {
    width: 100%;
  }
}

@media (max-width: 767px) {
  html {
    scroll-padding-top: 7rem;
  }

  .shell {
    width: min(var(--content-max), calc(100% - 24px));
  }

  .header-shell {
    min-height: 44px;
    gap: 8px;
  }

  .brand-mark {
    width: 22px;
    height: 22px;
    padding: 4px;
  }

  .brand-zh {
    font-size: 1rem;
  }

  .brand-en {
    display: none;
  }

  .header-button span:last-child {
    display: none;
  }

  .menu-button {
    display: inline-flex;
  }

  .channel-menu {
    top: 44px;
    width: 100%;
  }

  .channel-nav {
    padding-inline: 16px;
    overflow-x: auto;
  }

  .channel-nav a {
    flex: 0 0 auto;
  }

  .reader-tools {
    grid-template-columns: minmax(0, 1fr);
  }

  .main-shell {
    padding-top: 12px;
  }

  .homepage-grid {
    margin-top: 16px;
  }

  .section-heading {
    align-items: flex-start;
  }

  .live-signals {
    padding: 12px 14px 0;
    margin-bottom: 18px;
  }

  .live-signals-heading {
    align-items: flex-end;
  }

  .live-signal-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .live-signal-list li:nth-last-child(2) {
    border-bottom: 1px solid var(--fuel-line);
  }

  .story-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .story-card--stream {
    min-height: 48px;
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding: 12px 0;
  }

  .story-card--channel-lead .story-media {
    display: none;
  }

  .story-card--stream .story-card-body {
    padding: 0;
  }

  .story-title-row {
    align-items: start;
    gap: 8px;
  }

  .story-card .story-title-row :is(h2, h3) {
    display: -webkit-box;
    margin: 0;
    overflow: hidden;
    font-size: 16px;
    line-height: 23px;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
  }

  .story-summary {
    margin-block: 4px;
    line-height: 19px;
    -webkit-line-clamp: 1;
  }

  .story-card--channel-lead,
  .story-card--channel-lead.story-card--with-media {
    grid-template-columns: minmax(0, 1fr);
  }

  .channel-board {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    margin-top: 24px;
  }

  .story-meta-row {
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 4px 10px;
  }

  .news-day {
    grid-template-columns: minmax(0, 1fr);
  }

  .news-day > header {
    padding: 18px 0 7px;
  }

  .news-day > header::after {
    display: none;
  }

  .news-day-stories {
    border-left: 0;
    padding-left: 0;
  }

  .page-intro {
    padding: 18px 0 14px;
  }

  .story-hero {
    padding: 24px 0 18px;
  }

  .source-directory-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .source-directory-card {
    min-height: 0;
    padding: 16px 0;
  }

  .story-provenance,
  .engagement-snapshot {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .story-copy {
    padding: 22px 0;
  }

  .priority-item {
    grid-template-columns: 38px minmax(0, 1fr);
  }

  .priority-rank {
    padding-top: 18px;
  }

  .brief-list .story-card--stream {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.75rem;
  }

  .login-main {
    align-items: start;
    padding: 0.7rem;
  }

  .login-frame {
    grid-template-columns: minmax(0, 1fr);
  }

  .login-context {
    min-height: auto;
    padding: 1.5rem;
  }

  .login-panel {
    padding: 1.5rem;
  }

  .login-channel-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 439px) {
  .story-card--channel-lead {
    grid-template-columns: minmax(0, 1fr);
  }

  .brand-mark {
    display: none;
  }

  .brand-copy {
    gap: 0.4rem;
  }

  .brand-zh {
    font-size: 0.93rem;
  }

  .header-actions {
    gap: 0.25rem;
  }

  .header-button {
    padding-inline: 0.55rem;
  }

  .story-hero h1 {
    font-size: 1.9rem;
  }

  .story-card--stream,
  .brief-list .story-card--stream {
    grid-template-columns: minmax(0, 1fr);
  }

  .story-card--stream .story-card-body {
    grid-column: auto;
    grid-row: auto;
  }

  .story-provenance,
  .engagement-snapshot {
    grid-template-columns: minmax(0, 1fr);
  }

  .pagination {
    grid-template-columns: 1fr 1fr;
  }

  .pagination strong {
    grid-column: 1 / -1;
    grid-row: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}