.frontier-topic-page main {
  width: min(1480px, calc(100% - 48px));
  margin-inline: auto;
}

.frontier-topic-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  gap: 32px;
  align-items: center;
  padding: clamp(28px, 4vw, 56px);
  overflow: hidden;
}

.frontier-topic-hero h1 {
  max-width: 15ch;
  margin: 8px 0 16px;
}

.frontier-topic-hero .lead {
  max-width: 72ch;
  font-size: 1.08rem;
  line-height: 1.8;
}

.frontier-topic-hero__visual {
  min-height: 300px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(30, 139, 151, 0.28);
  background: rgba(244, 252, 251, 0.86);
  overflow: hidden;
}

.frontier-topic-hero__visual img {
  width: 100%;
  height: 100%;
  min-height: 300px;
  object-fit: contain;
}

.topic-signal-map {
  width: 100%;
  padding: 28px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.topic-signal-map span {
  min-height: 92px;
  display: grid;
  place-items: center;
  padding: 12px;
  border: 1px solid rgba(14, 119, 132, 0.28);
  background: #ffffff;
  color: #17394a;
  font-weight: 750;
  text-align: center;
}

.topic-signal-map span:nth-child(2n) {
  border-color: rgba(205, 122, 44, 0.36);
  background: #fff8ee;
}

.topic-signal-map span:nth-child(3n) {
  border-color: rgba(91, 88, 169, 0.34);
  background: #f7f5ff;
}

.frontier-topic-switcher {
  position: sticky;
  top: calc(var(--frontier-topbar-height, 76px) + 8px);
  z-index: 24;
  margin: 24px 0 28px;
  padding: 10px;
  border: 1px solid rgba(30, 139, 151, 0.25);
  background: rgba(249, 253, 252, 0.96);
  box-shadow: 0 14px 34px rgba(31, 72, 83, 0.12);
  backdrop-filter: blur(14px);
}

.frontier-topic-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.frontier-topic-tab {
  min-height: 46px;
  flex: 1 0 auto;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: #244657;
  font: inherit;
  font-weight: 760;
  cursor: pointer;
  white-space: nowrap;
}

.frontier-topic-tab:hover,
.frontier-topic-tab:focus-visible {
  border-color: rgba(13, 145, 155, 0.42);
  background: #eaf8f7;
  outline: none;
}

.frontier-topic-tab.is-active {
  border-color: #087f8c;
  background: #087f8c;
  color: #ffffff;
}

.frontier-topic-panel[hidden] {
  display: none !important;
}

.frontier-topic-panel {
  animation: frontier-panel-in 180ms ease-out;
}

@keyframes frontier-panel-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.topic-panel-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.42fr);
  gap: 24px;
  align-items: end;
  margin-bottom: 24px;
}

.topic-panel-head p {
  margin-bottom: 0;
}

.topic-panel-note {
  padding: 16px 18px;
  border-left: 4px solid #d07b2f;
  background: #fff8ee;
  color: #4d4438;
  line-height: 1.65;
}

.topic-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.topic-card {
  padding: 22px;
  border: 1px solid rgba(43, 117, 130, 0.23);
  background: rgba(255, 255, 255, 0.91);
}

.topic-card h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
}

.topic-card p:last-child,
.topic-card ul:last-child {
  margin-bottom: 0;
}

.topic-card--warm {
  border-top: 4px solid #d07b2f;
}

.topic-card--violet {
  border-top: 4px solid #6764aa;
}

.topic-card--teal {
  border-top: 4px solid #078896;
}

.topic-process {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
  counter-reset: process;
}

.topic-process article {
  position: relative;
  min-height: 156px;
  padding: 42px 18px 18px;
  border: 1px solid rgba(32, 113, 127, 0.24);
  background: #ffffff;
  counter-increment: process;
}

.topic-process article::before {
  content: counter(process, decimal-leading-zero);
  position: absolute;
  top: 14px;
  left: 18px;
  color: #087f8c;
  font-weight: 850;
}

.topic-process article:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -13px;
  width: 13px;
  height: 2px;
  background: #72b9bd;
}

.topic-process h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.topic-process p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.6;
}

.topic-timeline {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  margin: 24px 0;
}

.topic-timeline article {
  position: relative;
  padding: 28px 16px 16px;
  border-top: 3px solid #75b8bd;
}

.topic-timeline article::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 16px;
  width: 13px;
  height: 13px;
  border: 3px solid #ffffff;
  border-radius: 50%;
  background: #087f8c;
  box-shadow: 0 0 0 1px #087f8c;
}

.topic-timeline time {
  display: block;
  color: #087f8c;
  font-weight: 850;
}

.topic-timeline h3 {
  margin: 6px 0;
  font-size: 1rem;
}

.topic-evidence-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 22px;
  align-items: start;
}

.topic-figure {
  margin: 0;
  border: 1px solid rgba(32, 113, 127, 0.24);
  background: #ffffff;
}

.topic-figure img {
  display: block;
  width: 100%;
  max-height: 560px;
  object-fit: contain;
  background: #f7fbfa;
}

.topic-figure figcaption {
  padding: 14px 16px;
  border-top: 1px solid rgba(32, 113, 127, 0.2);
  color: #4d6876;
  font-size: 0.9rem;
  line-height: 1.55;
}

.topic-metric-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 22px 0;
}

.topic-metric-strip article {
  padding: 18px;
  border-left: 4px solid #087f8c;
  background: #ffffff;
}

.topic-metric-strip strong {
  display: block;
  margin-bottom: 5px;
  color: #102d3b;
}

.topic-metric-strip span {
  color: #55717f;
  font-size: 0.92rem;
}

.topic-example {
  padding: 20px;
  border: 1px solid rgba(208, 123, 47, 0.35);
  background: #fff9f0;
}

.topic-example code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.topic-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.topic-source-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.topic-source-list a {
  display: block;
  min-height: 100%;
  padding: 14px 16px;
  border: 1px solid rgba(37, 113, 125, 0.24);
  background: #ffffff;
  line-height: 1.55;
}

.frontier-topic-hero__literature {
  grid-template-rows: minmax(0, 1fr) auto;
  align-items: stretch;
  padding: 0;
}

.frontier-topic-hero__literature > button,
.frontier-literature-image {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  min-width: 0;
  overflow: hidden;
  padding: 14px;
  border: 0;
  background: #ffffff;
  cursor: zoom-in;
}

.frontier-topic-hero__literature > button {
  min-height: 255px;
}

.frontier-topic-hero__literature > button:hover,
.frontier-topic-hero__literature > button:focus-visible,
.frontier-literature-image:hover,
.frontier-literature-image:focus-visible {
  outline: 3px solid rgba(8, 127, 140, 0.26);
  outline-offset: -4px;
}

.frontier-topic-hero__literature > button img,
.frontier-literature-image img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 620px;
  object-fit: contain;
}

.frontier-topic-hero__literature > button span,
.frontier-literature-image > span {
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(7, 91, 100, 0.94);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 820;
  box-shadow: 0 7px 20px rgba(15, 57, 65, 0.2);
}

.frontier-topic-hero__literature figcaption {
  padding: 11px 14px 13px;
  border-top: 1px solid rgba(32, 113, 127, 0.2);
  background: #f6fbfa;
  color: #4d6876;
  font-size: 0.76rem;
  line-height: 1.5;
}

.frontier-topic-hero__literature figcaption a,
.frontier-literature-source a {
  color: #067580;
  text-underline-offset: 3px;
}

.frontier-literature-atlas,
.frontier-literature-card {
  margin-top: 26px;
  overflow: hidden;
  border: 1px solid rgba(32, 113, 127, 0.25);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 18px 46px rgba(29, 70, 78, 0.09);
}

.frontier-literature-head {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(320px, 1.22fr);
  gap: 24px;
  align-items: end;
  padding: 22px 24px;
  border-bottom: 1px solid rgba(32, 113, 127, 0.18);
  background:
    radial-gradient(circle at 88% 0%, rgba(208, 123, 47, 0.12), transparent 29%),
    linear-gradient(135deg, #edf8f6, #fbfdfc);
}

.frontier-literature-head h3,
.frontier-literature-card-head h3 {
  margin: 4px 0 0;
  color: #143c47;
  font-size: clamp(1.22rem, 2vw, 1.72rem);
  line-height: 1.3;
}

.frontier-literature-head > p {
  margin: 0;
  color: #4d6876;
  line-height: 1.7;
}

.frontier-figure-tabs {
  display: flex;
  gap: 8px;
  padding: 12px 18px;
  overflow-x: auto;
  border-bottom: 1px solid rgba(32, 113, 127, 0.16);
  background: #f7fbfa;
}

.frontier-figure-tabs button {
  min-height: 40px;
  flex: 0 0 auto;
  padding: 8px 15px;
  border: 1px solid rgba(8, 127, 140, 0.27);
  border-radius: 999px;
  background: #ffffff;
  color: #28515a;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 780;
  cursor: pointer;
}

.frontier-figure-tabs button:hover,
.frontier-figure-tabs button:focus-visible {
  border-color: #087f8c;
  outline: 3px solid rgba(8, 127, 140, 0.14);
}

.frontier-figure-tabs button.is-active {
  border-color: #087f8c;
  background: #087f8c;
  color: #ffffff;
}

.frontier-figure-panel[hidden] {
  display: none !important;
}

.frontier-figure-panel {
  animation: frontier-panel-in 180ms ease-out;
}

.frontier-literature-card-head {
  padding: 20px 22px 0;
}

.frontier-literature-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
  gap: 18px;
  align-items: stretch;
  padding: 18px;
}

.frontier-literature-image {
  min-height: 390px;
  border: 1px solid rgba(32, 113, 127, 0.2);
  border-radius: 10px;
}

.frontier-figure-reading {
  display: grid;
  align-content: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: frontier-reading;
}

.frontier-figure-reading li {
  position: relative;
  padding: 14px 14px 14px 48px;
  border: 1px solid rgba(32, 113, 127, 0.18);
  border-radius: 10px;
  background: #f9fcfb;
  counter-increment: frontier-reading;
}

.frontier-figure-reading li::before {
  content: counter(frontier-reading, decimal-leading-zero);
  position: absolute;
  top: 15px;
  left: 15px;
  color: #c26924;
  font-size: 0.73rem;
  font-weight: 860;
}

.frontier-figure-reading b,
.frontier-figure-reading p {
  display: block;
  margin: 0;
}

.frontier-figure-reading b {
  color: #173f48;
  font-size: 0.9rem;
}

.frontier-figure-reading p {
  margin-top: 5px;
  color: #536e79;
  font-size: 0.82rem;
  line-height: 1.62;
}

.frontier-literature-source {
  display: block;
  padding: 13px 18px 16px;
  border-top: 1px solid rgba(32, 113, 127, 0.17);
  background: #f7fbfa;
  color: #536f79;
  font-size: 0.78rem;
  line-height: 1.62;
}

.frontier-figure-dialog {
  width: min(94vw, 1500px);
  max-width: none;
  max-height: 94vh;
  padding: 48px 18px 16px;
  overflow: auto;
  border: 1px solid rgba(32, 113, 127, 0.32);
  border-radius: 16px;
  background: #ffffff;
  color: #173f48;
  box-shadow: 0 30px 100px rgba(8, 38, 48, 0.34);
}

.frontier-figure-dialog::backdrop {
  background: rgba(9, 30, 38, 0.72);
  backdrop-filter: blur(5px);
}

.frontier-figure-dialog > button {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(32, 113, 127, 0.3);
  border-radius: 50%;
  background: #edf7f5;
  color: #164750;
  font: inherit;
  font-size: 1.25rem;
  cursor: pointer;
}

.frontier-figure-dialog img {
  display: block;
  width: 100%;
  max-height: calc(94vh - 120px);
  object-fit: contain;
}

.frontier-figure-dialog p {
  margin: 12px auto 0;
  max-width: 1100px;
  color: #536e79;
  font-size: 0.9rem;
  line-height: 1.6;
}

@media (max-width: 1080px) {
  .frontier-topic-hero,
  .topic-panel-head,
  .topic-evidence-layout,
  .frontier-literature-head,
  .frontier-literature-grid {
    grid-template-columns: 1fr;
  }

  .frontier-literature-image {
    min-height: 300px;
  }

  .topic-card-grid,
  .topic-metric-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topic-process {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topic-process article:not(:last-child)::after {
    display: none;
  }

  .topic-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px 0;
  }
}

@media (max-width: 720px) {
  .frontier-topic-page main {
    width: min(100% - 24px, 1480px);
  }

  .frontier-topic-hero {
    padding: 24px 18px;
  }

  .frontier-topic-hero__visual {
    min-height: 220px;
  }

  .frontier-topic-hero__visual img {
    min-height: 220px;
  }

  .frontier-topic-switcher {
    margin-inline: -4px;
  }

  .topic-card-grid,
  .topic-metric-strip,
  .topic-process,
  .topic-timeline,
  .topic-source-list {
    grid-template-columns: 1fr;
  }

  .topic-signal-map {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 16px;
  }

  .frontier-literature-atlas,
  .frontier-literature-card {
    border-radius: 10px;
  }

  .frontier-literature-head,
  .frontier-literature-card-head {
    padding-inline: 16px;
  }

  .frontier-literature-grid {
    padding: 12px;
  }

  .frontier-literature-image {
    min-height: 220px;
  }

  .topic-timeline article {
    border-top: 0;
    border-left: 3px solid #75b8bd;
    padding: 12px 16px 18px 28px;
  }

  .topic-timeline article::before {
    top: 16px;
    left: -8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .frontier-topic-panel {
    animation: none;
  }
}