:root {
  --topic-coral: #ff4a35;
  --topic-ink: #322f2c;
  --topic-muted: #8a837c;
  --topic-line: #e7e3df;
  --topic-paper: #fff;
  --topic-canvas: #f8f8f7;
  --topic-peach: #fbf8f6;
  --topic-source: #0f756f;
}

.hot-topic-shell {
  position: fixed;
  inset: 0 0 0 var(--sidebar-w);
  z-index: 35;
  display: block;
  overflow: hidden;
  background: var(--topic-canvas);
}
body[data-workspace-mode="topics"] .topbar { left: var(--sidebar-w); }
body[data-workspace-mode="topics"] .template-dock,
body[data-workspace-mode="topics"] .workspace-main,
body[data-workspace-mode="topics"] .matrix-shell,
body[data-workspace-mode="topics"] .toolbox-shell,
body[data-workspace-mode="topics"] .release-shell { display: none; }
body[data-workspace-mode="topics"] .hot-topic-shell { display: block; }

.hot-topic-main {
  min-width: 0;
  height: 100%;
  padding-top: var(--topbar-h);
  overflow: auto;
  color: var(--topic-ink);
  background: var(--topic-canvas);
  outline: 0;
  scroll-behavior: smooth;
  font-family: "PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.topic-timeline-page {
  width: min(100%,1500px);
  margin: 0 auto;
  padding: 24px 36px 70px;
}
.topic-timeline-hero { padding: 0 80px 18px; }
.topic-timeline-hero > span {
  display: block;
  margin-bottom: 8px;
  color: #aaa39d;
  font: 700 9px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing: .1em;
}
.topic-timeline-hero h1 {
  margin: 0;
  color: #292725;
  font-size: clamp(26px,1.8vw,31px);
  font-weight: 500;
  line-height: 1.28;
  letter-spacing: -.02em;
}
.topic-timeline-hero p {
  margin: 8px 0 0;
  color: #96908a;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.65;
}

.topic-filter-bar {
  display: grid;
  grid-template-columns: minmax(190px,230px) minmax(190px,230px) minmax(300px,1fr);
  gap: 12px;
  margin-left: 80px;
  padding-bottom: 18px;
}
.topic-filter-select,
.topic-filter-search {
  position: relative;
  min-width: 0;
  height: 48px;
  display: flex;
  align-items: center;
  color: #2d2926;
  background: rgba(255,255,255,.9);
  border: 1px solid #e2ddd8;
  border-radius: 10px;
  box-shadow: 0 1px 3px rgba(57,43,33,.018);
  transition: border-color .16s ease,box-shadow .16s ease,background .16s ease;
}
.topic-filter-select:focus-within,
.topic-filter-search:focus-within {
  background: #fff;
  border-color: #ff8d7d;
  box-shadow: 0 0 0 4px rgba(255,74,53,.09);
}
.topic-filter-select > span {
  flex: 0 0 auto;
  padding-left: 15px;
  color: #a19a94;
  font-size: 11px;
  font-weight: 500;
}
.topic-filter-select select {
  width: 100%;
  height: 100%;
  padding: 0 38px 0 12px;
  color: #4a4541;
  background: transparent;
  border: 0;
  outline: 0;
  appearance: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
}
.topic-filter-select > svg {
  position: absolute;
  right: 14px;
  width: 14px;
  height: 14px;
  fill: none;
  stroke: #746d66;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
}
.topic-filter-search { padding: 0 14px 0 15px; }
.topic-filter-search > svg {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  fill: none;
  stroke: #777069;
  stroke-width: 1.6;
  stroke-linecap: round;
}
.topic-filter-search input {
  min-width: 0;
  flex: 1;
  align-self: stretch;
  margin-left: 9px;
  padding: 0;
  color: #4a4541;
  background: transparent;
  border: 0;
  outline: 0;
  font-size: 13px;
  font-weight: 400;
}
.topic-filter-search input::placeholder { color: #aaa49e; }
.topic-filter-search kbd {
  flex: 0 0 auto;
  padding: 5px 7px;
  color: #9a928b;
  background: #f7f4f1;
  border: 1px solid #ddd7d2;
  border-radius: 6px;
  font: 600 8px/1 ui-monospace,SFMono-Regular,Menlo,monospace;
}

.topic-timeline-section > header {
  min-height: 52px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-left: 80px;
  padding: 0 2px 11px;
  border-bottom: 1px solid #d9d4cf;
}
.topic-timeline-section > header span {
  color: var(--topic-coral);
  font: 700 8px/1 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing: .13em;
}
.topic-timeline-section > header h2 {
  margin: 7px 0 0;
  color: #383430;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -.02em;
}
.topic-timeline-section > header > strong {
  padding-bottom: 1px;
  color: #938c86;
  font-size: 11px;
  font-weight: 500;
}

.topic-signal-list {
  position: relative;
  display: grid;
  gap: 10px;
  padding-top: 12px;
}
.topic-signal-list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 66px;
  width: 1px;
  background: #e2dfdc;
}
.topic-signal {
  position: relative;
  display: grid;
  grid-template-columns: 80px minmax(0,1fr);
  align-items: start;
}
.topic-signal-time {
  position: relative;
  min-height: 72px;
  padding: 16px 18px 0 0;
  color: #99928c;
  text-align: right;
}
.topic-signal-time time {
  font: 500 12px/1 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing: -.02em;
}
.topic-signal-time i {
  position: absolute;
  top: 18px;
  right: 10px;
  width: 8px;
  height: 8px;
  background: #9b948e;
  border: 2px solid var(--topic-canvas);
  border-radius: 50%;
  box-sizing: content-box;
  transform: translateX(50%);
  transition: background .16s ease,transform .16s ease;
}
.topic-signal.is-expanded .topic-signal-time i {
  background: var(--topic-coral);
  transform: translateX(50%) scale(1.12);
}
.topic-signal-card {
  position: relative;
  min-width: 0;
  overflow: hidden;
  background: rgba(255,255,255,.86);
  border: 1px solid #ebe7e3;
  border-radius: 12px;
  box-shadow: none;
  transition: border-color .16s ease,box-shadow .16s ease;
}
.topic-signal-source-link {
  position: absolute;
  top: 14px;
  right: 18px;
  z-index: 2;
  color: #d36f62;
  font-size: 10px;
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
}
.topic-signal-source-link:hover { text-decoration: underline; }
.topic-signal-source-link:focus-visible {
  outline: 2px solid rgba(231,99,84,.28);
  outline-offset: 3px;
  border-radius: 3px;
}
.topic-signal.is-expanded .topic-signal-card {
  border-color: #f0d8d3;
  box-shadow: 0 4px 14px rgba(83,64,55,.025);
}
.topic-signal-toggle {
  width: 100%;
  min-height: 94px;
  display: grid;
  grid-template-columns: minmax(0,1fr) auto;
  grid-template-rows: auto auto auto;
  column-gap: 18px;
  align-items: center;
  padding: 14px 18px;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
}
.topic-signal-toggle:hover { background: #fffdfa; }
.topic-domain-tag {
  grid-column: 1;
  justify-self: start;
  padding: 3px 6px;
  color: #327d78;
  background: #e6f4f2;
  border-radius: 5px;
  font-size: 9px;
  font-weight: 500;
  line-height: 1;
}
.topic-signal-toggle h2 {
  grid-column: 1;
  margin: 7px 0 0;
  color: #34312e;
  font-size: 16.5px;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: -.006em;
}
.topic-signal-toggle p {
  grid-column: 1;
  display: -webkit-box;
  overflow: hidden;
  margin: 4px 0 0;
  color: #8d8781;
  font-size: 12.5px;
  font-weight: 400;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}
.topic-signal-toggle > strong {
  grid-column: 2;
  grid-row: 1/4;
  min-width: 112px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 0 12px;
  color: #e76354;
  background: #fffefa;
  border: 1px solid #f3cfc9;
  border-radius: 8px;
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
  align-self: end;
}
.topic-signal-toggle > strong svg {
  width: 13px;
  height: 13px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform .18s ease;
}
.topic-signal.is-expanded .topic-signal-toggle > strong svg { transform: rotate(180deg); }

.signal-topic-panel {
  margin: 0 14px 14px;
  padding: 14px;
  background: #fbf8f6;
  border: 1px solid #eee5e0;
  border-radius: 11px;
  animation: topic-inline-enter .22s ease both;
}
@keyframes topic-inline-enter {
  from { opacity: 0; transform: translateY(-7px); }
  to { opacity: 1; transform: translateY(0); }
}
.signal-topic-panel-head {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 14px;
  padding: 0 2px 11px;
}
.signal-topic-panel-head > div { display: flex; align-items: center; gap: 9px; }
.signal-topic-panel-head i {
  color: var(--topic-coral);
  font-size: 16px;
  font-style: normal;
}
.signal-topic-panel-head strong {
  color: #4a4541;
  font-size: 14.5px;
  font-weight: 500;
}
.signal-topic-grid {
  display: grid;
  grid-template-columns: repeat(6,minmax(0,1fr));
  gap: 9px;
}
.signal-topic-card {
  grid-column: span 2;
  min-width: 0;
  min-height: 96px;
  display: flex;
  flex-direction: column;
  padding: 13px 14px 14px;
  background: #fffefc;
  border: 1px solid #eee9e5;
  border-radius: 9px;
  box-shadow: none;
  transition: transform .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.signal-topic-card:nth-last-child(2):nth-child(3n + 1),
.signal-topic-card:last-child:nth-child(3n + 2) { grid-column: span 3; }
.signal-topic-card:only-child { grid-column: 1/-1; }
.signal-topic-card:hover {
  transform: translateY(-1px);
  border-color: #efc7bf;
  box-shadow: 0 5px 14px rgba(83,64,55,.05);
}
.signal-topic-card > header { display: flex; align-items: center; gap: 9px; }
.signal-topic-card > header > span {
  color: #b8b1ab;
  font: 500 9px/1 ui-monospace,SFMono-Regular,Menlo,monospace;
}
.signal-topic-card > header > div { min-width: 0; display: flex; gap: 5px; }
.signal-topic-card em {
  padding: 3px 5px;
  border-radius: 5px;
  font-size: 8.5px;
  font-style: normal;
  font-weight: 500;
  line-height: 1;
}
.signal-topic-card em { color: #8b847e; background: #f4f2f0; }
.signal-topic-card h3 {
  margin: 10px 0 0;
  color: #423e3a;
  font-size: 15.5px;
  font-weight: 500;
  line-height: 1.46;
  letter-spacing: -.006em;
}

.topic-signal-empty {
  margin-left: 88px;
  min-height: 260px;
  display: grid;
  place-content: center;
  justify-items: center;
  color: #8d857e;
  background: #fff;
  border: 1px dashed #d8d1ca;
  border-radius: 14px;
  text-align: center;
}
.topic-signal-empty strong { color: #312c28; font-size: 20px; }
.topic-signal-empty p { margin: 8px 0 0; font-size: 13px; }
.topic-timeline-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 28px 0 0 88px;
  padding: 18px 2px 0;
  color: #9a928b;
  border-top: 1px solid #ddd8d3;
  font-size: 11px;
}
.topic-timeline-footer strong { color: #645d57; font-weight: 750; }

.topic-board-switch {
  width: max-content;
  display: flex;
  gap: 3px;
  margin: 0 0 22px 80px;
  padding: 4px;
  background: #ebe8e4;
  border: 1px solid #e0dbd6;
  border-radius: 11px;
}
.topic-board-switch button {
  position: relative;
  min-width: 146px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 11px 0 13px;
  color: #736c66;
  background: transparent;
  border: 0;
  border-radius: 7px;
  cursor: pointer;
  font: inherit;
  transition: color .16s ease,background .16s ease,box-shadow .16s ease;
}
.topic-board-switch button:hover { color: #3d3935; }
.topic-board-switch button.is-active {
  color: #2c2926;
  background: #fff;
  box-shadow: 0 1px 4px rgba(55,43,34,.12);
}
.topic-board-switch button > span { min-width: 0; display: flex; align-items: center; gap: 7px; font-size: 12px; font-weight: 750; }
.topic-board-switch button > span i { width: 8px; height: 8px; flex: 0 0 8px; display: grid; place-items: center; color: var(--topic-coral); font-size: 11px; font-style: normal; }
.topic-board-switch button[data-topic-board="daily"] > span i { background: var(--topic-coral); border-radius: 50%; box-shadow: 0 0 0 3px rgba(255,74,53,.1); }
.topic-board-switch button em { color: #aaa29b; font: 750 10px/1 ui-monospace,SFMono-Regular,Menlo,monospace; font-style: normal; }
.topic-board-switch button.is-active em { color: var(--topic-coral); }
.topic-board-switch button b {
  position: absolute;
  top: -10px;
  right: -5px;
  padding: 3px 5px;
  color: #fff;
  background: var(--topic-coral);
  border: 2px solid #ebe8e4;
  border-radius: 5px;
  font: 800 7px/1 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing: .08em;
}

.viral-topic-page { --viral-blue: #1f57db; }
.viral-topic-hero {
  display: grid;
  grid-template-columns: minmax(0,1.05fr) minmax(430px,.95fr);
  gap: 56px;
  margin-left: 80px;
  padding: 10px 0 30px;
}
.viral-topic-hero-copy > span {
  display: block;
  margin-bottom: 12px;
  color: #aaa39d;
  font: 700 9px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;
  letter-spacing: .11em;
}
.viral-topic-hero-copy h1 {
  margin: 0;
  color: #292725;
  font-size: clamp(32px,3vw,46px);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.055em;
}
.viral-topic-hero-copy h1 em { color: var(--topic-coral); font-style: normal; }
.viral-topic-hero-copy p {
  max-width: 620px;
  margin: 15px 0 0;
  color: #8e8781;
  font-size: 13px;
  line-height: 1.75;
}
.viral-topic-scoreboard {
  display: grid;
  grid-template-columns: repeat(2,minmax(0,1fr));
  overflow: hidden;
  background: #fff;
  border: 1px solid #dfdad5;
  border-radius: 13px;
  box-shadow: 0 10px 30px rgba(53,41,32,.035);
}
.viral-topic-scoreboard > div {
  position: relative;
  min-height: 104px;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto 1fr;
  align-items: start;
  gap: 4px 12px;
  padding: 16px 17px 14px;
  border-right: 1px solid #ece8e4;
  border-bottom: 1px solid #ece8e4;
}
.viral-topic-scoreboard > div:nth-child(2n) { border-right: 0; }
.viral-topic-scoreboard > div:nth-last-child(-n+2) { border-bottom: 0; }
.viral-topic-scoreboard span { color: #817a74; font-size: 10px; font-weight: 650; }
.viral-topic-scoreboard strong { grid-row: 1/3; grid-column: 2; color: #302c28; font: 750 31px/1 ui-monospace,SFMono-Regular,Menlo,monospace; letter-spacing: -.08em; }
.viral-topic-scoreboard small { align-self: end; color: #bbb4ae; font: 700 7px/1 ui-monospace,SFMono-Regular,Menlo,monospace; letter-spacing: .11em; }
.viral-topic-scoreboard .is-accent { background: var(--topic-coral); border-color: var(--topic-coral); }
.viral-topic-scoreboard .is-accent span,.viral-topic-scoreboard .is-accent small { color: rgba(255,255,255,.72); }
.viral-topic-scoreboard .is-accent strong { color: #fff; }

.viral-filter-bar {
  display: grid;
  grid-template-columns: repeat(3,minmax(155px,190px)) minmax(280px,1fr);
  gap: 10px;
  margin-left: 80px;
  padding: 0 0 22px;
}
.viral-topic-library > header {
  min-height: 54px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-left: 80px;
  padding: 0 2px 12px;
  border-bottom: 1px solid #d9d4cf;
}
.viral-topic-library > header span { color: var(--topic-coral); font: 700 8px/1 ui-monospace,SFMono-Regular,Menlo,monospace; letter-spacing: .13em; }
.viral-topic-library > header h2 { margin: 7px 0 0; color: #383430; font-size: 19px; font-weight: 600; letter-spacing: -.02em; }
.viral-topic-library > header > strong { padding-bottom: 1px; color: #938c86; font-size: 11px; font-weight: 500; }
.viral-topic-grid {
  display: grid;
  grid-template-columns: repeat(3,minmax(0,1fr));
  gap: 12px;
  margin-left: 80px;
  padding-top: 14px;
}
.viral-topic-card {
  position: relative;
  min-width: 0;
  min-height: 258px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 16px 17px 15px;
  background: #fff;
  border: 1px solid #e5e0db;
  border-radius: 11px;
  box-shadow: 0 2px 7px rgba(54,42,33,.025);
  transition: transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.viral-topic-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg,var(--topic-coral) 0 38%,#f5d7d2 38% 100%);
  opacity: 0;
  transition: opacity .18s ease;
}
.viral-topic-card:hover { transform: translateY(-2px); border-color: #efc8c1; box-shadow: 0 11px 28px rgba(66,45,35,.07); }
.viral-topic-card:hover::before { opacity: 1; }
.viral-topic-card > header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.viral-topic-labels { min-width: 0; display: flex; align-items: center; flex-wrap: wrap; gap: 5px; }
.viral-topic-labels span,.viral-topic-labels em,.viral-topic-labels b {
  padding: 4px 6px;
  border-radius: 5px;
  font-size: 8.5px;
  font-style: normal;
  font-weight: 700;
  line-height: 1;
}
.viral-topic-labels span { color: #355e88; background: #eaf2f9; }
.viral-topic-labels span[data-track="AI"] { color: #5b43a9; background: #eeeafd; }
.viral-topic-labels span[data-track="职场"] { color: #8a5b16; background: #f8efdd; }
.viral-topic-labels span[data-track="大厂"] { color: #a34136; background: #faeae7; }
.viral-topic-labels span[data-track="科技"] { color: #176b66; background: #e4f4f1; }
.viral-topic-labels em.is-hot { color: #d94635; background: #fff0ed; }
.viral-topic-labels em.is-evergreen { color: #287158; background: #e9f5ef; }
.viral-topic-labels b { color: #fff; background: #2f2a26; font-family: ui-monospace,SFMono-Regular,Menlo,monospace; }
.viral-topic-card > header > strong { flex: 0 0 auto; color: #2f2a26; font: 700 19px/1 ui-monospace,SFMono-Regular,Menlo,monospace; letter-spacing: -.06em; }
.viral-topic-card > header > strong small { margin-left: 2px; color: #aaa29c; font-size: 8px; letter-spacing: 0; }
.viral-topic-card h3 {
  margin: 19px 0 0;
  color: #302d2a;
  font-size: 19px;
  font-weight: 650;
  line-height: 1.42;
  letter-spacing: -.022em;
}
.viral-topic-card > p {
  display: -webkit-box;
  overflow: hidden;
  margin: 10px 0 0;
  color: #817a74;
  font-size: 12px;
  line-height: 1.7;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}
.viral-topic-card dl { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: auto 0 0; padding-top: 15px; }
.viral-topic-card dl div { min-width: 0; padding: 9px 10px; background: #f8f6f4; border-radius: 7px; }
.viral-topic-card dt { color: #aaa39d; font-size: 8px; font-weight: 600; }
.viral-topic-card dd { overflow: hidden; margin: 4px 0 0; color: #5d5752; font-size: 10px; font-weight: 650; text-overflow: ellipsis; white-space: nowrap; }
.viral-topic-empty {
  grid-column: 1/-1;
  min-height: 280px;
  display: grid;
  place-content: center;
  justify-items: center;
  color: #8d857e;
  background: #fff;
  border: 1px dashed #d8d1ca;
  border-radius: 14px;
  text-align: center;
}
.viral-topic-empty span { color: var(--topic-coral); font-size: 28px; }
.viral-topic-empty strong { margin-top: 8px; color: #312c28; font-size: 19px; }
.viral-topic-empty p { margin: 7px 0 0; font-size: 12px; }
.viral-topic-footer { margin-left: 80px; }

.hot-topic-loading,
.hot-topic-error {
  min-height: calc(100vh - var(--topbar-h));
  display: grid;
  place-content: center;
  justify-items: center;
  color: #777069;
  text-align: center;
}
.hot-topic-loading { display: flex; align-items: center; justify-content: center; gap: 10px; font-size: 13px; font-weight: 750; }
.hot-topic-loading i { width: 10px; height: 10px; background: var(--topic-coral); border-radius: 50%; animation: topic-pulse 1s ease-in-out infinite alternate; }
@keyframes topic-pulse { to { opacity: .25; transform: scale(.7); } }
.hot-topic-error > span { width: 38px; height: 38px; display: grid; place-items: center; color: #fff; background: var(--topic-coral); border-radius: 50%; font-weight: 900; }
.hot-topic-error h2 { margin: 16px 0 5px; color: #2a2521; font-size: 21px; }
.hot-topic-error p { margin: 0; font-size: 13px; }
.hot-topic-error button { margin-top: 16px; padding: 10px 15px; color: #fff; background: #24201d; border: 0; border-radius: 8px; cursor: pointer; font-size: 11px; font-weight: 850; }

@media (max-width: 1200px) {
  .topic-timeline-page { padding-inline: 24px; }
  .topic-board-switch { margin-left: 72px; }
  .topic-timeline-hero { padding-left: 72px; padding-right: 0; }
  .topic-filter-bar,.topic-timeline-section > header { margin-left: 72px; }
  .viral-topic-hero,.viral-filter-bar,.viral-topic-library > header,.viral-topic-grid,.viral-topic-footer { margin-left: 72px; }
  .viral-topic-hero { grid-template-columns: minmax(0,1fr) minmax(390px,.9fr); gap: 34px; }
  .viral-filter-bar { grid-template-columns: repeat(3,minmax(140px,1fr)); }
  .viral-filter-bar .topic-filter-search { grid-column: 1/-1; }
  .viral-topic-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .topic-signal { grid-template-columns: 72px minmax(0,1fr); }
  .topic-signal-list::before { left: 58px; }
  .topic-signal-toggle > strong { min-width: 108px; }
  .topic-signal-toggle h2 { font-size: 17px; }
}
@media (max-width: 980px) {
  .topic-filter-bar { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .topic-filter-search { grid-column: 1/-1; }
  .signal-topic-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .signal-topic-card,
  .signal-topic-card:nth-last-child(2):nth-child(3n + 1),
  .signal-topic-card:last-child:nth-child(3n + 2),
  .signal-topic-card:only-child { grid-column: auto; }
  .topic-signal-toggle { grid-template-columns: minmax(0,1fr); }
  .topic-signal-toggle > strong { grid-column: 1; grid-row: auto; justify-self: start; align-self: auto; height: 36px; margin-top: 12px; }
  .viral-topic-hero { grid-template-columns: 1fr; gap: 24px; }
  .viral-topic-scoreboard { max-width: 640px; }
}
@media (max-width: 760px) {
  .topic-timeline-page { padding: 22px 16px 64px; }
  .topic-board-switch,.topic-timeline-hero,.topic-filter-bar,.topic-timeline-section > header,.topic-timeline-footer,
  .viral-topic-hero,.viral-filter-bar,.viral-topic-library > header,.viral-topic-grid,.viral-topic-footer { margin-left: 0; padding-left: 0; }
  .topic-board-switch { width: 100%; }
  .topic-board-switch button { min-width: 0; flex: 1; }
  .topic-timeline-hero { padding-right: 0; }
  .topic-filter-bar { grid-template-columns: 1fr; }
  .topic-filter-search { grid-column: auto; }
  .topic-signal-list::before { left: 8px; }
  .topic-signal { grid-template-columns: 18px minmax(0,1fr); }
  .topic-signal-time { padding: 20px 0 0; }
  .topic-signal-time time { display: none; }
  .topic-signal-time i { right: 10px; }
  .signal-topic-grid { grid-template-columns: 1fr; }
  .signal-topic-panel { margin: 0 10px 10px; padding: 12px; }
  .signal-topic-panel-head { align-items: flex-start; }
  .topic-timeline-section > header { align-items: flex-start; }
  .viral-topic-hero { padding-top: 0; }
  .viral-topic-hero-copy h1 { font-size: 34px; }
  .viral-topic-scoreboard > div { min-height: 94px; }
  .viral-filter-bar { grid-template-columns: 1fr; }
  .viral-filter-bar .topic-filter-search { grid-column: auto; }
  .viral-topic-library > header { align-items: flex-start; }
  .viral-topic-grid { grid-template-columns: 1fr; }
  .viral-topic-card { min-height: 252px; }
}
@media (prefers-reduced-motion: reduce) {
  .hot-topic-main { scroll-behavior: auto; }
  .signal-topic-panel { animation: none; }
  .topic-signal-card,.topic-signal-time i,.signal-topic-card,.topic-signal-toggle > strong svg { transition: none; }
}