:root {
  --ink: #1e2e3b;
  --ink-soft: #536572;
  --muted: #71808a;
  --navy: #18384f;
  --blue: #3f6f8e;
  --blue-soft: #eaf1f5;
  --accent: #b36d57;
  --paper: #ffffff;
  --canvas: #f5f7f8;
  --line: #d5dfe4;
  --line-dark: #b9c7cf;
  --shadow: 0 14px 34px rgba(29, 56, 74, 0.07);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--canvas);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background: linear-gradient(180deg, #fbfcfc 0%, var(--canvas) 34rem);
  line-height: 1.55;
}

button,
audio {
  font: inherit;
}

button {
  cursor: pointer;
}

.site-shell {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
}

.page-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  justify-content: center;
  gap: 13px;
  margin-top: 28px;
}

.page-nav a {
  width: 100%;
  padding: 14px 20px;
  border: 1px solid var(--line-dark);
  border-bottom: 3px solid transparent;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-nav a:hover,
.page-nav a.is-active {
  border-bottom-color: var(--accent);
  background: var(--paper);
  color: var(--navy);
}

.demo-page {
  display: none;
}

.demo-page.is-active {
  display: block;
}

.hero:not(.construction-active) .hero-pipeline {
  display: none;
}

.hero:not(.construction-active) .hero-grid {
  grid-template-columns: 1fr;
}

/* The construction pipeline sits beneath the title as a horizontal sequence. */
.hero-grid {
  grid-template-columns: 1fr;
}

.hero-pipeline {
  flex-direction: row;
  align-items: stretch;
  margin-top: 48px;
}

.pipeline-node {
  display: block;
  flex: 1;
  padding: 18px 21px 20px;
}

.pipeline-node + .pipeline-node {
  border-top: 0;
  border-left: 1px solid var(--line);
}

.pipeline-node > span {
  display: block;
  margin-bottom: 7px;
}

.pipeline-arrow {
  display: grid;
  min-width: 34px;
  place-items: center;
  color: var(--blue);
}

.hero {
  padding: 24px 0 86px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 78px;
  padding-bottom: 17px;
  border-bottom: 1px solid var(--line);
}

.language-toggle {
  min-width: 46px;
  padding: 8px 12px;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--navy);
  font: inherit;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 160ms ease, transform 160ms ease;
}

.language-toggle:hover {
  background: var(--blue-soft);
  transform: translateY(-1px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid var(--navy);
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.22rem;
  line-height: 1;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  letter-spacing: -0.02em;
  font-size: 0.98rem;
}

.brand small,
.topbar-note,
.eyebrow,
.hero-meta,
.step-eyebrow,
.media-label,
.fact-label,
.summary-badge,
.source-label,
.dialogue-role,
.dialogue-round {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  line-height: 1.4;
  text-transform: uppercase;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  letter-spacing: 0.16em;
  font-size: 0.52rem;
}

.topbar-note {
  color: var(--muted);
  font-size: 0.62rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  gap: 76px;
}

.hero-copy {
  max-width: none;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
}

.hero h1,
.section-heading h2,
.flow-toolbar h2 {
  margin: 0;
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  letter-spacing: -0.045em;
}

.hero h1 {
  font-size: clamp(4.4rem, 10vw, 8.4rem);
  line-height: 0.9;
}

.benchmark-intro {
  max-width: 900px;
  margin: 24px auto 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
  line-height: 1.9;
}

.benchmark-intro-list {
  display: inline-block;
  padding-left: 1em;
  color: var(--ink);
}

.benchmark-stats {
  display: grid;
  grid-template-columns: repeat(6, minmax(90px, 1fr));
  gap: 9px;
  max-width: 1000px;
  width: 100%;
  margin-top: 28px;
  margin-right: auto;
  margin-left: auto;
}

.benchmark-stat {
  display: grid;
  gap: 3px;
  padding: 15px 15px 16px;
  border-top: 3px solid var(--blue);
  background: rgba(255, 255, 255, 0.68);
}

.benchmark-stat strong {
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.7rem;
  font-weight: 400;
  line-height: 1;
}

.benchmark-stat span {
  color: var(--muted);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.resource-links {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 18px;
  justify-content: center;
  margin-top: 17px;
}

.resource-link {
  padding: 7px 11px;
  border-bottom: 1px solid var(--line-dark);
  color: var(--blue);
  font-size: 0.86rem;
  font-weight: 650;
  text-decoration: none;
}

.resource-link:hover {
  border-bottom-color: var(--accent);
  color: var(--navy);
}

.resource-link.is-placeholder {
  color: var(--muted);
  cursor: default;
}

.hero-lede {
  max-width: 520px;
  margin: 30px 0 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
  line-height: 1.85;
}

.hero-meta {
  display: inline-block;
  margin: 33px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line-dark);
  color: var(--blue);
  letter-spacing: 0.13em;
}

.hero-pipeline {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  margin-top: 48px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.72);
}

.pipeline-node {
  display: block;
  flex: 1;
  padding: 18px 21px 20px;
}

.pipeline-node + .pipeline-node {
  border-top: 0;
  border-left: 1px solid var(--line);
}

.pipeline-node > span {
  display: block;
  margin-bottom: 7px;
  color: var(--blue);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
}

.pipeline-node strong {
  color: var(--navy);
  font-size: 0.93rem;
  font-weight: 650;
}

.pipeline-node small {
  color: var(--muted);
  font-size: 0.76rem;
}

.pipeline-arrow {
  display: grid;
  min-width: 34px;
  place-items: center;
  color: var(--blue);
}

.intro-section {
  display: block;
  padding: 66px 0 30px;
  border-top: 1px solid var(--line-dark);
}

.intro-section .hero-pipeline {
  margin-top: 31px;
}

.intro-section .section-description {
  max-width: none;
  width: 100%;
  margin-top: 25px;
  font-size: 1.08rem;
  line-height: 1.9;
}

.section-heading h2 {
  font-size: clamp(2.55rem, 5vw, 4.65rem);
  line-height: 0.98;
}

.section-heading h2 span {
  color: var(--blue);
}

.section-description {
  max-width: 460px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.85;
}

.case-switcher {
  margin: 36px 0 28px;
}

.case-tabs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.case-tab {
  display: flex;
  min-height: 138px;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 21px 24px 22px;
  border: 1px solid var(--line-dark);
  border-top: 3px solid transparent;
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  text-align: left;
  transition: border-color 160ms ease, box-shadow 160ms ease,
    background-color 160ms ease;
}

.case-tab:hover,
.case-tab.is-active {
  border-top-color: var(--blue);
  background: #fcfefe;
  box-shadow: var(--shadow);
}

.case-tab-kicker,
.summary-badge {
  color: var(--accent);
}

.case-tab-title {
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.55rem;
  line-height: 1.08;
}

.case-tab-subtitle {
  color: var(--ink-soft);
  font-size: 0.84rem;
  line-height: 1.6;
}

.case-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 18px;
  align-items: start;
  margin-top: 16px;
  padding: 21px 24px 22px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--blue);
  background: var(--blue-soft);
}

.case-summary .summary-badge {
  grid-row: span 2;
  padding-top: 3px;
  white-space: nowrap;
}

.case-summary h3 {
  margin: 0;
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.55rem;
  font-weight: 400;
  line-height: 1.15;
}

.case-summary p {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.summary-sources {
  display: flex;
  grid-column: 2;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 15px;
}

.summary-sources span {
  padding: 4px 8px;
  border: 1px solid #c7d5dc;
  background: rgba(255, 255, 255, 0.62);
  color: var(--blue);
  font-size: 0.69rem;
}

.flow-panel {
  margin-top: 42px;
  padding: 30px 30px 38px;
  border: 1px solid var(--line-dark);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.flow-toolbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 26px;
  padding-bottom: 23px;
  border-bottom: 1px solid var(--line);
}

.flow-toolbar .eyebrow {
  margin-bottom: 8px;
}

.flow-toolbar h2 {
  font-size: clamp(1.8rem, 3vw, 2.65rem);
  line-height: 1.05;
}

.flow-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.button {
  min-height: 37px;
  padding: 7px 13px;
  border: 1px solid var(--line-dark);
  border-radius: 0;
  background: var(--paper);
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 650;
  transition: background-color 160ms ease, border-color 160ms ease,
    color 160ms ease;
}

.button:hover:not(:disabled) {
  border-color: var(--blue);
  background: var(--blue-soft);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.button-primary {
  border-color: var(--navy);
  background: var(--navy);
  color: #fff;
}

.button-primary:hover:not(:disabled) {
  border-color: var(--blue);
  background: var(--blue);
}

.button-quiet {
  color: var(--muted);
}

.button-icon {
  margin-right: 4px;
  font-size: 0.72rem;
}

.progress-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 22px 0 26px;
}

.progress-track {
  height: 3px;
  flex: 1;
  overflow: hidden;
  background: #e5ebee;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--blue);
  transition: width 280ms ease;
}

#progress-label {
  min-width: 82px;
  color: var(--muted);
  font-size: 0.72rem;
  text-align: right;
}

.flow-canvas {
  max-width: 970px;
  margin: 0 auto;
}

.loading-state,
.empty-state,
.error-state {
  padding: 46px 20px;
  border: 1px dashed var(--line-dark);
  color: var(--muted);
  font-size: 0.86rem;
  text-align: center;
}

.error-state {
  border-color: #d4a497;
  color: #9b5544;
}

.flow-step {
  display: grid;
  grid-template-columns: 65px minmax(0, 1fr);
  gap: 23px;
  padding: 26px 28px 30px 20px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--step-color, var(--blue));
  background: var(--paper);
  box-shadow: 0 8px 22px rgba(29, 56, 74, 0.045);
  opacity: 1;
  transition: opacity 320ms ease, transform 320ms ease;
}

.flow-step.is-hidden {
  display: none;
}

.flow-step.is-new {
  opacity: 0;
  transform: translateY(11px);
}

.flow-step.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.step-index {
  padding-top: 1px;
  color: var(--step-color, var(--blue));
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.75rem;
  line-height: 1;
}

.step-index::after {
  display: block;
  width: 26px;
  height: 1px;
  margin-top: 12px;
  background: var(--step-color, var(--blue));
  content: "";
}

.step-eyebrow {
  margin: 0 0 8px;
  color: var(--step-color, var(--blue));
}

.step-content h3 {
  margin: 0;
  color: var(--navy);
  font-size: 1.28rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.step-intro {
  max-width: 790px;
  margin: 9px 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
  line-height: 1.75;
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 21px;
}

.fact-card {
  min-width: 0;
  padding: 13px 14px 14px;
  border: 1px solid #e0e7ea;
  background: #fbfcfc;
}

.fact-card.fact-wide {
  grid-column: 1 / -1;
}

.fact-label {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.61rem;
}

.fact-value {
  overflow-wrap: anywhere;
  color: var(--ink);
  font-size: 0.87rem;
  line-height: 1.7;
}

.fact-list {
  margin: 0;
  padding-left: 18px;
}

.fact-list li + li {
  margin-top: 4px;
}

.fact-list.fact-paragraphs li + li {
  margin-top: 8px;
}

.step-quote {
  margin: 20px 0 0;
  padding: 15px 17px 16px;
  border: 1px solid #dbe4e8;
  border-left: 3px solid var(--step-color, var(--blue));
  background: #f8fafb;
}

.step-quote .quote-label {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.step-quote p {
  display: -webkit-box;
  overflow: hidden;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.89rem;
  line-height: 1.72;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 13px;
  margin-top: 21px;
}

.media-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--paper);
}

.media-card figure {
  margin: 0;
  background: #edf2f3;
}

.media-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  cursor: zoom-in;
}

.media-card.media-final {
  grid-column: 1 / -1;
}

.media-card.media-final img {
  max-height: 620px;
  aspect-ratio: auto;
  object-fit: contain;
}

.image-entity-step .media-grid {
  max-width: 290px;
}

.image-entity-step .media-card img {
  aspect-ratio: 1 / 1;
}

.step-next-button {
  display: block;
  margin: 22px 0 0 auto;
  padding: 8px 13px;
  border: 1px solid var(--blue);
  border-radius: 0;
  background: var(--blue-soft);
  color: var(--navy);
  font-size: 0.76rem;
  font-weight: 650;
  transition: background-color 160ms ease, color 160ms ease;
}

.step-next-button:hover:not(:disabled) {
  background: var(--blue);
  color: #fff;
}

.step-next-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.media-card-body {
  padding: 12px 14px 14px;
}

.media-label {
  display: block;
  color: var(--blue);
  font-size: 0.61rem;
}

.media-caption {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.55;
}

.media-card audio {
  display: block;
  width: calc(100% - 26px);
  margin: 18px 13px 3px;
}

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

.audio-list .media-card {
  display: grid;
  align-content: start;
}

.dialogue-list {
  display: grid;
  gap: 9px;
  margin-top: 21px;
}

.dialogue-line {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 12px;
  padding: 11px 13px;
  border-left: 2px solid #b8cbd4;
  background: #fbfcfc;
}

.dialogue-round {
  padding-top: 3px;
  color: var(--muted);
  font-size: 0.58rem;
}

.dialogue-bubble {
  display: grid;
  gap: 3px;
  color: var(--ink);
  font-size: 0.84rem;
  line-height: 1.6;
}

.dialogue-bubble.assistant {
  margin-top: 8px;
  color: var(--ink-soft);
}

.dialogue-role {
  color: var(--blue);
  font-size: 0.56rem;
}

.flow-arrow {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  min-height: 49px;
  color: var(--blue);
  transition: opacity 280ms ease, transform 280ms ease;
}

.flow-arrow.is-hidden {
  display: none;
}

.flow-arrow.is-new {
  opacity: 0;
  transform: translateY(-5px);
}

.flow-arrow.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.arrow-line {
  height: 1px;
  background: var(--line-dark);
}

.arrow-head {
  color: var(--blue);
  font-size: 1.55rem;
  line-height: 1;
}

.arrow-label {
  color: var(--muted);
  font-size: 0.67rem;
  letter-spacing: 0.04em;
  text-align: left;
}

.method-note {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 20px;
  margin: 52px 0 0;
  padding: 24px 0 25px;
  border-top: 1px solid var(--line-dark);
  border-bottom: 1px solid var(--line-dark);
}

.note-index {
  color: var(--blue);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}

.method-note .eyebrow {
  margin-bottom: 7px;
}

.method-note p:last-child {
  max-width: 700px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.87rem;
  line-height: 1.75;
}

.method-note strong {
  color: var(--navy);
  font-weight: 700;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 23px 0 34px;
  color: var(--muted);
  font-size: 0.72rem;
}

@media (max-width: 900px) {
  .hero-grid,
  .intro-section {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .hero-pipeline {
    max-width: 570px;
  }

  .flow-toolbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .flow-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 620px) {
  .site-shell {
    width: min(100% - 28px, 1160px);
  }

  .hero {
    padding-bottom: 58px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 13px;
    margin-bottom: 53px;
  }

  .page-nav {
    grid-template-columns: 1fr;
    gap: 7px;
    margin-top: 23px;
  }

  .page-nav a {
    padding: 9px 11px;
    font-size: 0.68rem;
  }

  .hero h1 {
    font-size: clamp(4rem, 22vw, 6.2rem);
  }

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

  .hero-pipeline {
    max-width: none;
  }

  .hero-pipeline {
    flex-direction: column;
  }

  .pipeline-node + .pipeline-node {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .pipeline-node > span {
    display: inline;
    margin: 0;
  }

  .pipeline-arrow {
    min-height: 18px;
    transform: rotate(90deg);
  }

  .case-tabs,
  .facts-grid,
  .audio-list {
    grid-template-columns: 1fr;
  }

  .case-summary {
    grid-template-columns: 1fr;
    row-gap: 7px;
  }

  .case-summary .summary-badge,
  .summary-sources {
    grid-column: 1;
    grid-row: auto;
  }

  .flow-panel {
    padding: 22px 14px 28px;
  }

  .flow-step {
    grid-template-columns: 43px minmax(0, 1fr);
    gap: 13px;
    padding: 22px 15px 24px 13px;
  }

  .step-index {
    font-size: 1.45rem;
  }

  .dialogue-line {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .dialogue-round {
    padding-top: 0;
  }

  .flow-arrow {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    gap: 0 9px;
    padding: 7px 12px;
  }

  .arrow-line {
    grid-row: 1 / span 2;
    width: 1px;
    height: 35px;
    justify-self: center;
  }

  .arrow-head {
    transform: rotate(90deg);
  }

  .arrow-label {
    grid-column: 2;
  }

  .method-note {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }
}

/* Unified, quieter native audio controls for the construction and QA views. */
audio {
  accent-color: var(--blue);
}

.media-card audio,
.qa-clue-audio audio {
  box-sizing: border-box;
  height: 42px;
  border: 1px solid #cbd9df;
  border-radius: 9px;
  background: #eef4f5;
}

.media-card audio {
  width: calc(100% - 28px);
  margin: 16px 14px 5px;
}

.qa-clue-audio audio {
  width: 100%;
  margin: 0;
}

audio::-webkit-media-controls-panel {
  background: #eef4f5;
}

audio::-webkit-media-controls-play-button {
  border-radius: 50%;
  background-color: #d4e4e8;
}

audio::-webkit-media-controls-timeline {
  margin-right: 7px;
  margin-left: 7px;
}

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

.qa-section {
  margin-top: 88px;
  padding-top: 64px;
  border-top: 1px solid var(--line-dark);
}

.qa-section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.72fr);
  align-items: end;
  gap: 76px;
  margin-bottom: 32px;
}

.qa-section-heading h2 {
  margin: 0;
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.45rem, 5vw, 4.35rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 1;
}

.qa-section-heading > p {
  max-width: 460px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.8;
}

.qa-grid {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.qa-card {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line-dark);
  background: var(--paper);
  box-shadow: 0 8px 22px rgba(29, 56, 74, 0.045);
}

.qa-card-header {
  padding: 21px 22px 19px;
  border-bottom: 1px solid var(--line);
  background: #f8fafb;
}

.qa-card-kicker,
.qa-subheading,
.qa-meta span,
.qa-audio-label {
  color: var(--blue);
  font-size: 0.61rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

.qa-card-header h3 {
  margin: 8px 0 0;
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.65rem;
  font-weight: 400;
  line-height: 1.1;
}

.qa-card-header p {
  margin: 9px 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.65;
}

.qa-card-body {
  padding: 19px 22px 22px;
}

.qa-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 16px;
}

.qa-meta span {
  padding: 4px 7px;
  border: 1px solid #cbd9df;
  background: var(--blue-soft);
  font-size: 0.56rem;
}

.qa-question {
  padding-bottom: 19px;
  border-bottom: 1px solid var(--line);
}

.qa-question-text {
  margin: 9px 0 0;
  white-space: pre-line;
  color: var(--ink);
  font-size: 0.94rem;
  font-weight: 600;
  line-height: 1.75;
}

.qa-option-grid,
.qa-clue-image-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin-top: 15px;
}

.qa-option,
.qa-clue-image {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--line);
  background: #fbfcfc;
}

.qa-option img,
.qa-clue-image img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  cursor: zoom-in;
}

.qa-option figcaption,
.qa-clue-image figcaption {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  min-height: 41px;
  padding: 7px 8px 8px;
  color: var(--ink-soft);
  font-size: 0.72rem;
  line-height: 1.5;
}

.qa-option-letter {
  display: inline-grid;
  width: 21px;
  height: 21px;
  flex: 0 0 21px;
  place-items: center;
  border: 1px solid var(--blue);
  color: var(--blue);
  font-size: 0.69rem;
  line-height: 1;
}

.qa-text-options {
  display: grid;
  gap: 7px;
  margin-top: 15px;
}

.qa-text-option {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 9px;
  border: 1px solid #e0e7ea;
  color: var(--ink-soft);
  font-size: 0.81rem;
  line-height: 1.45;
}

.qa-clues {
  padding: 19px 0;
  border-bottom: 1px solid var(--line);
}

.qa-subheading {
  display: block;
  margin: 0;
  color: var(--muted);
  font-size: 0.6rem;
}

.qa-clue-image-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 12px;
}

.qa-clue-image figcaption {
  min-height: 0;
  padding: 6px 7px;
  font-size: 0.61rem;
}

.qa-clue-audio-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.qa-clue-audio {
  min-width: 0;
  padding: 9px 10px 8px;
  border: 1px solid #e0e7ea;
  background: #fbfcfc;
}

.qa-audio-label {
  display: block;
  overflow: hidden;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.55rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.qa-clue-audio audio {
  display: block;
  width: 100%;
  height: 42px;
}

.custom-audio {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  align-items: center;
  gap: 11px;
  min-height: 54px;
  padding: 8px 12px;
  border: 1px solid rgba(126, 162, 173, 0.42);
  border-radius: 14px;
  background: linear-gradient(135deg, #f7fbfb, #e8f1f3);
  box-shadow: 0 5px 14px rgba(31, 70, 83, 0.08), inset 0 1px rgba(255,255,255,.8);
}

.media-card .custom-audio {
  margin: 15px 14px 5px;
}

.custom-audio-play {
  display: grid;
  position: relative;
  width: 34px;
  height: 34px;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  box-shadow: 0 3px 8px rgba(24, 56, 79, 0.25);
  transition: transform 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

.custom-audio-play::before {
  content: "";
  width: 0;
  height: 0;
  margin-left: 3px;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 10px solid #fff;
}

.custom-audio-play.is-playing::before {
  width: 10px;
  height: 13px;
  margin-left: 0;
  border: 0;
  background: linear-gradient(90deg, #fff 0 35%, transparent 35% 65%, #fff 65% 100%);
}

.custom-audio-play.is-error { background: #a44747; }
.custom-audio-play.is-error::before { content: "!"; width: auto; height: auto; margin: 0; background: none; font-weight: 800; }

.custom-audio-play:hover {
  background: var(--blue);
  transform: scale(1.06);
  box-shadow: 0 5px 12px rgba(36, 113, 145, 0.28);
}

.custom-audio-progress {
  width: 100%;
  height: 8px;
  margin: 0;
  appearance: none;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--blue) var(--progress, 0%), #cbdde1 var(--progress, 0%));
  accent-color: var(--blue);
  cursor: pointer;
}

.custom-audio-progress::-webkit-slider-runnable-track {
  height: 7px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--blue) var(--progress, 0%), #cbdde1 var(--progress, 0%));
}

.custom-audio-progress::-webkit-slider-thumb {
  width: 14px;
  height: 14px;
  margin-top: -4px;
  appearance: none;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 1px 4px rgba(24, 56, 79, 0.28);
}

.custom-audio-progress::-moz-range-track {
  height: 7px;
  border-radius: 99px;
  background: #cbdde1;
}

.custom-audio-progress::-moz-range-progress {
  height: 6px;
  border-radius: 99px;
  background: var(--blue);
}

.custom-audio-progress::-moz-range-thumb {
  width: 11px;
  height: 11px;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 1px 4px rgba(24, 56, 79, 0.28);
}

.custom-audio-time {
  min-width: 72px;
  color: var(--muted);
  font-size: 0.62rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.custom-audio > audio {
  display: none;
}

.qa-answer {
  margin-top: 18px;
  border: 1px solid #c9d8df;
  background: #f8fbfc;
}

.qa-answer summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 13px;
  color: var(--navy);
  cursor: pointer;
  font-size: 0.81rem;
  font-weight: 650;
  list-style: none;
}

.qa-answer summary::-webkit-details-marker {
  display: none;
}

.qa-answer-toggle {
  color: var(--blue);
  font-size: 1.1rem;
  font-weight: 400;
  line-height: 1;
}

.qa-answer[open] .qa-answer-toggle {
  transform: rotate(45deg);
}

.qa-answer-body {
  display: grid;
  gap: 14px;
  padding: 0 13px 15px;
  border-top: 1px solid #d9e5e9;
}

.qa-answer-value,
.qa-preference {
  display: grid;
  gap: 6px;
  padding-top: 13px;
}

.qa-answer-value strong {
  color: var(--accent);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.55rem;
  font-weight: 400;
  line-height: 1;
}

.qa-preference p {
  margin: 0;
  color: var(--ink);
  font-size: 0.84rem;
  line-height: 1.65;
}

.qa-answer-note {
  display: grid;
  gap: 6px;
  padding-top: 13px;
  border-top: 1px solid #d9e5e9;
}

.qa-answer-note p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.8rem;
  line-height: 1.65;
}

.results-section {
  margin-top: 88px;
  padding-top: 64px;
  border-top: 1px solid var(--line-dark);
}

.results-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.72fr);
  align-items: end;
  gap: 76px;
  margin-bottom: 30px;
}

.results-heading h2 {
  margin: 0;
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.45rem, 5vw, 4.35rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 1;
}

.results-heading > p {
  max-width: 460px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.8;
}

.results-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 17px;
}

.result-tab {
  display: grid;
  gap: 5px;
  min-height: 73px;
  padding: 14px 17px;
  border: 1px solid var(--line-dark);
  border-top: 3px solid transparent;
  background: var(--paper);
  color: var(--ink);
  text-align: left;
}

.result-tab:hover,
.result-tab.is-active {
  border-top-color: var(--accent);
  background: #fcfefe;
  box-shadow: var(--shadow);
}

.result-tab strong {
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.22rem;
  font-weight: 400;
}

.result-tab span {
  color: var(--muted);
  font-size: 0.72rem;
}

.results-panel {
  padding: 28px 30px 34px;
  border: 1px solid var(--line-dark);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.result-panel-title {
  margin-bottom: 22px;
  color: var(--blue);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.result-intro {
  display: grid;
  gap: 7px;
  margin-bottom: 22px;
}

.result-question,
.result-card-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.79rem;
  line-height: 1.6;
}

.result-intro h3 {
  margin: 0;
  color: var(--navy);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  font-weight: 400;
  line-height: 1.1;
}

.result-callout {
  margin: 0;
  padding: 11px 13px;
  border-left: 3px solid var(--accent);
  background: #fbf7f4;
  color: var(--ink-soft);
  font-size: 0.84rem;
  line-height: 1.6;
}

.result-model-grid,
.quality-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 15px;
  margin-top: 15px;
}

.rq1-reference-layout {
  display: grid;
  grid-template-columns: minmax(210px, 0.72fr) minmax(0, 1.14fr) minmax(0, 1.14fr);
  gap: 15px;
  align-items: stretch;
}

.rq1-reference-side {
  display: grid;
  gap: 15px;
}

.rq1-reference-models {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.rq1-reference-card {
  min-width: 0;
  height: 100%;
}

.rq1-reference-layout > .result-human-card {
  height: 100%;
}

.rq1-reference-model + .rq1-reference-model {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
  border-left: 1px solid var(--line);
  padding-left: 9px;
}

.rq1-reference-model-title {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.61rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rq1-reference-card .result-chart-legend {
  display: none;
}

.rq1-reference-card .result-chart-group {
  width: 62px;
  flex-basis: 62px;
}

.rq1-reference-card .result-chart-label {
  min-height: 0;
}

.rq1-main-models {
  grid-template-columns: 1fr;
  margin-top: 15px;
}

.result-card {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  background: #fcfdfd;
}

.result-human-card {
  margin-bottom: 15px;
  background: #f8fafb;
}

.result-card-title {
  margin-bottom: 13px;
  color: var(--navy);
  font-size: 0.92rem;
  font-weight: 700;
}

.result-chart {
  overflow-x: auto;
}

.result-chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.61rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.chart-legend-item::before {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 5px;
  content: "";
}

.explicit-legend::before { background: #8bb7aa; }
.implicit-legend::before { background: #d28a70; }
.gap-legend::before { background: var(--accent); }

.result-chart-plot {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  min-width: max-content;
  padding: 0 7px 0 3px;
  border-bottom: 1px solid var(--line-dark);
  justify-content: center;
  margin-right: auto;
  margin-left: auto;
  background: repeating-linear-gradient(
    to top,
    transparent 0,
    transparent 38px,
    #edf1f2 39px,
    transparent 40px
  );
}

.result-chart-group {
  display: grid;
  width: 82px;
  flex: 0 0 82px;
  justify-items: center;
  align-items: end;
}

.result-chart-bars {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  width: 100%;
}

.result-chart-column {
  display: flex;
  align-items: flex-end;
  width: 30px;
}

.result-chart-column .result-bar-wrap {
  width: 100%;
}

.result-chart-column .result-bar-track {
  width: 26px;
}

.result-chart-label {
  display: -webkit-box;
  overflow: hidden;
  width: 100%;
  min-height: 31px;
  margin-top: 7px;
  color: var(--ink);
  font-size: 0.62rem;
  line-height: 1.35;
  text-align: center;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.result-chart-gap {
  margin-top: 3px;
  color: var(--accent);
  font-size: 0.59rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.quality-task {
  padding: 11px 0 13px;
  border-top: 1px solid #e5ebee;
}

.quality-task-name {
  margin-bottom: 6px;
  color: var(--ink);
  font-size: 0.74rem;
  font-weight: 650;
}

.quality-chart-plot {
  display: flex;
  align-items: flex-end;
  justify-content: space-around;
  gap: 10px;
  min-width: 250px;
  padding: 0 8px;
  border-bottom: 1px solid var(--line-dark);
  background: repeating-linear-gradient(
    to top,
    transparent 0,
    transparent 31px,
    #edf1f2 32px,
    transparent 33px
  );
}

.quality-chart-group {
  display: grid;
  width: 74px;
  flex: 0 0 74px;
  justify-items: center;
}

.quality-chart-bars {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  width: 100%;
}

.quality-chart-bars .result-bar-wrap {
  width: 29px;
}

.quality-chart-bars .result-bar-track {
  width: 26px;
}

.quality-chart-label {
  margin-top: 6px;
  color: var(--ink);
  font-size: 0.63rem;
  text-align: center;
}

.result-table {
  overflow-x: auto;
}

.result-row {
  display: grid;
  grid-template-columns: minmax(118px, 1.2fr) minmax(120px, 1fr) minmax(120px, 1fr) 53px;
  align-items: center;
  gap: 10px;
  min-width: 500px;
  padding: 8px 0;
  border-top: 1px solid #e5ebee;
  color: var(--ink-soft);
  font-size: 0.72rem;
}

.result-row-wide {
  grid-template-columns: 75px 95px minmax(105px, 1fr) minmax(105px, 1fr) 53px;
  min-width: 560px;
}

.result-row:first-child {
  border-top: 0;
}

.result-row.result-header {
  padding-top: 0;
  border-top: 0;
  color: var(--muted);
  font-size: 0.59rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-row.oracle-row {
  background: #f3f7f8;
}

.result-method {
  color: var(--ink);
  font-weight: 600;
}

.result-gap {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.result-bar-wrap {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
}

.result-bar-track {
  display: block;
  height: 7px;
  flex: 1;
  overflow: hidden;
  background: #e7edef;
}

.result-bar-fill {
  display: block;
  height: 100%;
  background: var(--blue);
}

.result-bar-fill.explicit {
  background: #8bb7aa;
}

.result-bar-fill.implicit {
  background: #d28a70;
}

.result-bar-fill.gap {
  background: var(--accent);
}

.result-number {
  width: 29px;
  color: var(--ink);
  font-size: 0.68rem;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.result-summary-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 15px;
}

.result-summary-strip span {
  padding: 12px 13px;
  border: 1px solid #d8e3e6;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 0.74rem;
  line-height: 1.5;
}

.quality-card {
  overflow-x: auto;
}

.series-levels,
.series-row {
  display: grid;
  grid-template-columns: minmax(110px, 1fr) repeat(3, minmax(70px, 1fr));
  gap: 8px;
  align-items: center;
}

.series-levels {
  padding-bottom: 7px;
  color: var(--muted);
  font-size: 0.59rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.quality-task {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3px;
  padding: 9px 0;
  border-top: 1px solid #e5ebee;
}

.quality-task-name {
  margin-bottom: 2px;
  color: var(--ink);
  font-size: 0.74rem;
  font-weight: 650;
}

.series-tag {
  display: block;
  margin-bottom: -23px;
  color: var(--muted);
  font-size: 0.57rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.explicit-tag { color: #57917f; }
.implicit-tag { color: #b4654d; }
.gap-tag { color: var(--accent); }

.series-row > .series-cell:first-of-type {
  margin-left: 65px;
}

.series-row .result-bar-wrap {
  grid-column: 1 / -1;
  margin-left: 65px;
}

.tradeoff-card,
.retrieval-card {
  margin-top: 15px;
}

.tradeoff-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  padding: 12px 0 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.tradeoff-label {
  min-width: 145px;
  color: var(--navy);
}

.tradeoff-stat {
  padding: 4px 7px;
  background: #eef4f5;
  color: var(--blue);
}

.rq2-paper-figure {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid #e5ebee;
}

.rq2-paper-figure img {
  display: block;
  width: min(100%, 760px);
  margin: 0 auto;
  border: 1px solid #d9e3e6;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 5px 16px rgba(31, 70, 83, 0.08);
  cursor: zoom-in;
}

.rq2-paper-figure figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.66rem;
  line-height: 1.5;
  text-align: center;
}

.rq2-figure-explanation {
  margin-top: 15px;
  padding: 13px 14px;
  border-left: 3px solid #c77c61;
  background: #fff8f4;
}

.rq2-figure-explanation p {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
  line-height: 1.7;
}

.implicit-stat { background: #fbefe9; color: #a75e47; }
.explicit-stat { background: #edf6f2; color: #4e8877; }

.retrieval-table {
  overflow-x: auto;
  margin-top: 13px;
}

.retrieval-row {
  display: grid;
  grid-template-columns: 50px repeat(4, minmax(90px, 1fr));
  gap: 10px;
  min-width: 480px;
  align-items: center;
  padding: 8px 0;
  border-top: 1px solid #e5ebee;
  color: var(--ink-soft);
  font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
}

.rq3-notation {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: baseline;
  margin: 0 0 15px;
  padding: 12px 14px;
  border: 1px solid #d7e3e5;
  border-left: 3px solid var(--blue);
  background: #f3f8f8;
  color: var(--ink-soft);
  font-size: 0.78rem;
  line-height: 1.6;
}

.rq3-notation strong {
  color: var(--navy);
  white-space: nowrap;
}

.rq3-notation-table {
  width: 100%;
  margin-top: 9px;
  border-collapse: collapse;
  color: var(--ink-soft);
  font-size: 0.68rem;
}

.rq3-notation-table th,
.rq3-notation-table td {
  padding: 7px 8px;
  border: 1px solid #dbe6e8;
  text-align: left;
  line-height: 1.4;
}

.rq3-notation-table tr:first-child {
  background: #eaf3f4;
}

.rq3-notation-table th {
  color: var(--navy);
  font-weight: 750;
}

.rq3-variant-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 15px;
}

.rq3-variant-card,
.rq3-oracle-card {
  min-width: 0;
}

.rq3-variant-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.rq3-variant-badge {
  flex: 0 0 auto;
  padding: 4px 8px;
  border-radius: 999px;
  background: #e8f2f3;
  color: var(--blue);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.rq3-variant-models {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.rq3-variant-model {
  min-width: 0;
  padding-top: 10px;
  border-top: 1px solid #e5ebee;
}

.rq3-variant-model-name {
  min-height: 30px;
  color: var(--navy);
  font-size: 0.64rem;
  font-weight: 750;
  line-height: 1.35;
}

.rq3-variant-model .result-chart {
  margin-top: 7px;
}

.rq3-oracle-card {
  margin-top: 15px;
}

@media (max-width: 760px) {
  .rq3-variant-grid,
  .rq3-variant-models {
    grid-template-columns: 1fr;
  }
}

.rq3-backbone-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 15px;
}

.rq3-backbone-card,
.rq3-backbone-variant {
  min-width: 0;
}

.rq3-backbone-variants {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.rq3-backbone-variant {
  padding: 9px 6px 7px;
  border: 1px solid #e1eaeb;
  border-radius: 8px;
  background: #fbfdfd;
}

.rq3-backbone-variant .rq3-variant-badge {
  display: table;
  margin: 0 auto 4px;
}

.rq3-backbone-variant .result-chart {
  margin: 0;
}

.rq3-backbone-variant .result-chart-legend {
  display: none;
}

.rq3-backbone-variant .result-chart-plot {
  padding: 4px 0 0;
}

.rq3-backbone-variant .result-chart-group {
  width: 100%;
}

.rq3-backbone-variant .result-chart-label {
  min-height: 0;
  font-size: 0.54rem;
}

.rq3-backbone-variant .result-chart-gap {
  font-size: 0.55rem;
}

.rq3-oracle-title {
  margin-top: 15px;
  padding-top: 12px;
  border-top: 1px solid #e5ebee;
  color: var(--muted);
  font-size: 0.64rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.rq3-backbone-card > .result-chart {
  margin-top: 6px;
}

.experiment-conclusion {
  margin-top: 16px;
  padding: 15px 16px;
  border: 1px solid #d8e3e5;
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  background: linear-gradient(135deg, #fffaf6, #f7fbfa);
}

.experiment-conclusion-point {
  position: relative;
  margin: 9px 0 0;
  padding-left: 16px;
  color: var(--ink-soft);
  font-size: 0.94rem;
  line-height: 1.8;
}

.experiment-conclusion-point::before {
  content: "•";
  position: absolute;
  left: 1px;
  color: var(--accent);
  font-size: 1.1em;
  font-weight: 800;
}

@media (max-width: 900px) {
  .rq3-backbone-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .rq3-backbone-variants {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Results typography: keep labels readable at a glance. */
.result-card-title {
  font-size: 1.04rem;
}

.result-chart-legend {
  font-size: 0.72rem;
}

.result-chart-label {
  font-size: 0.72rem;
}

.result-chart-gap {
  font-size: 0.68rem;
}

.rq1-reference-model-title {
  font-size: 0.7rem;
}

.rq3-backbone-variant .result-chart-label {
  font-size: 0.64rem;
}

.rq3-backbone-variant .result-chart-gap {
  font-size: 0.63rem;
}

.rq2-audio-note {
  display: grid;
  gap: 4px;
  margin-top: 14px;
  padding: 10px 11px;
  border-left: 3px solid #d28a70;
  background: #fff7f2;
  color: var(--ink-soft);
  font-size: 0.74rem;
  line-height: 1.55;
}

.rq2-audio-note strong {
  color: #9d5a44;
  font-size: 0.75rem;
}

.retrieval-header {
  border-top: 0;
  color: var(--muted);
  font-size: 0.59rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

@media (max-width: 900px) {
  .results-heading {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .rq1-reference-layout {
    grid-template-columns: 1fr;
  }

  .rq1-reference-models {
    grid-template-columns: 1fr;
  }

  .rq1-reference-model + .rq1-reference-model {
    border-top: 1px solid var(--line);
    border-left: 0;
    padding-top: 13px;
    padding-left: 0;
  }
}

@media (max-width: 620px) {
  .results-tabs,
  .result-model-grid,
  .quality-grid,
  .result-summary-strip {
    grid-template-columns: 1fr;
  }

  .results-panel {
    padding: 22px 14px 28px;
  }
}

@media (max-width: 900px) {
  .qa-section-heading {
    grid-template-columns: 1fr;
    gap: 25px;
  }
}

@media (max-width: 620px) {
  .qa-grid {
    grid-template-columns: 1fr;
  }

  .qa-card-body,
  .qa-card-header {
    padding-left: 16px;
    padding-right: 16px;
  }

  .qa-clue-image-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .qa-clue-audio-grid {
    grid-template-columns: 1fr;
  }
}

.step-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin-top: 20px;
}

.step-controls button {
  min-height: 34px;
  padding: 7px 12px;
  border: 1px solid #c6d7dc;
  border-radius: 999px;
  background: #f7fbfb;
  color: var(--navy);
  font: inherit;
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.step-controls button:hover:not(:disabled) {
  border-color: var(--blue);
  background: #eaf5f6;
  transform: translateY(-1px);
}

.step-controls button:disabled {
  cursor: default;
  opacity: 0.42;
}

.step-controls .step-previous-button,
.step-controls .step-next-button {
  border-color: var(--navy);
  background: var(--navy);
  color: #fff;
}

.step-controls .step-previous-button:hover:not(:disabled),
.step-controls .step-next-button:hover:not(:disabled) {
  border-color: var(--blue);
  background: var(--blue);
}

.step-controls .step-top-button {
  margin-left: auto;
  border-color: #d39b87;
  color: #96553f;
  background: #fff7f3;
}

.qa-refusal-info,
.qa-adversarial-answer,
.qa-trap-reason {
  margin-top: 14px;
  padding: 12px 13px;
  border: 1px solid #e1cfc5;
  border-radius: 10px;
  background: #fffaf7;
}

.qa-refusal-summary,
.qa-adversarial-answer p,
.qa-trap-reason p {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.76rem;
  line-height: 1.65;
}

.qa-subtype-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.qa-subtype-list span {
  padding: 4px 7px;
  border: 1px solid #eadbd4;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.58rem;
  line-height: 1.2;
}

.qa-subtype-list span.is-current {
  border-color: #c77c61;
  background: #f4dfd5;
  color: #8d4c38;
  font-weight: 800;
}

.qa-adversarial-answer {
  border-color: #c8dcd5;
  background: #f4faf8;
}

.qa-trap-reason {
  border-color: #e6d9a9;
  background: #fffdf3;
}