:root {
  --bg: #f5f3ee;
  --panel: rgba(255, 255, 255, 0.9);
  --panel-solid: #ffffff;
  --panel-strong: #fefcf8;
  --ink: #102033;
  --muted: #506173;
  --soft: #7a8794;
  --line: rgba(16, 32, 51, 0.12);
  --line-strong: rgba(16, 32, 51, 0.22);
  --accent: #1d4ed8;
  --accent-soft: rgba(29, 78, 216, 0.12);
  --accent-strong: #1e3a8a;
  --sage: #0f766e;
  --sage-soft: rgba(15, 118, 110, 0.12);
  --rose: #b42318;
  --rose-soft: rgba(180, 35, 24, 0.1);
  --amber: #b45309;
  --amber-soft: rgba(180, 83, 9, 0.12);
  --shadow: 0 16px 42px rgba(16, 32, 51, 0.08);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --max: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(29, 78, 216, 0.08), transparent 28%),
    radial-gradient(circle at top right, rgba(15, 118, 110, 0.08), transparent 24%),
    linear-gradient(180deg, #fcfbf8 0%, var(--bg) 100%);
  line-height: 1.65;
}

main p,
main li,
figcaption,
.inline-note,
.group-note,
.summary-copy,
.transcript,
.context-block,
.query-block,
.expected-block,
.insight,
.source-block,
.help-block,
.response-text,
.turn-copy,
.compact-copy,
.compact-signal {
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

audio {
  width: 100%;
  height: 42px;
}

button,
input,
textarea,
select {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  background: rgba(252, 251, 248, 0.82);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  padding: 14px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-mark {
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.brand-subtitle {
  font-size: 0.92rem;
  color: var(--muted);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.nav-links a {
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-links a:hover {
  background: rgba(16, 32, 51, 0.06);
  color: var(--ink);
}

main {
  padding-bottom: 96px;
}

.section {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  padding: 34px 0;
}

.hero {
  padding-top: 54px;
}

.hero-shell {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}

.hero-title {
  margin: 0;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(2.4rem, 5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.hero-tagline {
  margin: 8px 0 0;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  line-height: 1.3;
  color: var(--muted);
  font-weight: 400;
}

.hero-links {
  display: flex;
  gap: 16px;
  margin-top: 20px;
  justify-content: center;
}

.hero-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--panel-solid);
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.hero-link-btn:hover {
  background: rgba(16, 32, 51, 0.06);
  box-shadow: 0 2px 8px rgba(16, 32, 51, 0.1);
}

.hero-link-disabled {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

.hero-link-icon {
  width: 22px;
  height: 22px;
  object-fit: contain;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.card-label {
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 4px 0 0;
  justify-content: center;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.74);
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

.abstract-section {
  width: 100%;
  max-width: 52rem;
  margin-top: 16px;
  text-align: left;
}

.abstract-heading {
  text-align: center;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1.5rem;
  margin: 0 0 20px;
  color: var(--ink);
  font-weight: 700;
}

.abstract-body {
  display: grid;
  gap: 16px;
}

.abstract-body p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.75;
}

.card-label {
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
}

.section-head {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
}

.section-head .kicker {
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.section-head h2,
.section-head h3 {
  margin: 0;
  font-family: Georgia, 'Times New Roman', serif;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.section-head h2 {
  font-size: clamp(1.4rem, 2.2vw, 1.8rem);
}

.section-head h3 {
  font-size: clamp(1.2rem, 1.8vw, 1.5rem);
}

.section-head p,
.prose p,
.callout p,
.sample-card p,
.placeholder-card p,
.case-panel p,
.pillar-card p,
.figure-caption,
.small-note,
.text-block {
  margin: 0;
  color: var(--muted);
}

.callout {
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
}

.inline-note {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(16, 32, 51, 0.045);
  color: var(--muted);
  font-size: 0.95rem;
}

.figure-frame {
  overflow: hidden;
  border-radius: var(--radius-xl);
  border: 1px solid var(--line);
  background: var(--panel-solid);
  box-shadow: var(--shadow);
}

.figure-frame img {
  width: 100%;
  height: auto;
}

.figure-caption {
  padding: 16px 20px 22px;
  border-top: 1px solid var(--line);
  font-size: 0.96rem;
}

.figure-medium {
  max-width: 75%;
  margin-left: auto;
  margin-right: auto;
}

.two-col,
.split-grid,
.case-grid,
.prompt-groups,
.samples-grid,
.pillar-grid,
.overview-band,
.tier-grid,
.audio-pair,
.response-grid,
.comparison-grid,
.quick-grid {
  display: grid;
  gap: 20px;
}

.overview-figure {
  margin-bottom: 22px;
}

.overview-band {
  grid-template-columns: minmax(0, 1.35fr) repeat(2, minmax(0, 1fr));
  align-items: stretch;
}

.overview-band > * {
  height: 100%;
}

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

.metric-card,
.tier-card,
.pillar-card,
.prompt-group,
.sample-card,
.placeholder-card,
.case-panel,
.comparison-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.metric-card,
.tier-card,
.pillar-card,
.prompt-group,
.placeholder-card,
.case-panel,
.comparison-card {
  padding: 24px;
}

.metric-card h3,
.tier-card h3,
.pillar-card h3,
.prompt-group h3,
.placeholder-card h3,
.case-panel h3,
.comparison-card h3 {
  margin: 0 0 8px;
  font-family: Georgia, 'Times New Roman', serif;
  line-height: 1.1;
}

.metric-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
}

.metric-card,
.tier-card {
  display: grid;
  align-content: start;
  gap: 12px;
}

.overview-band .inline-note {
  margin-top: auto;
}

.tier-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 22px;
}

.tier-pill,
.sample-pill,
.lang-pill,
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  width: fit-content;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tier-pill {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.sample-pill {
  background: rgba(16, 32, 51, 0.06);
  color: var(--soft);
}

.lang-pill {
  background: rgba(15, 118, 110, 0.12);
  color: var(--sage);
}

.status-pill {
  background: var(--amber-soft);
  color: var(--amber);
}

.pillar-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 22px;
}

.pillar-list,
.signal-list {
  margin: 14px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.pillar-list li,
.signal-list li {
  margin-bottom: 8px;
}

.prompt-groups,
.samples-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.prompt-group {
  display: grid;
  gap: 16px;
}

.prompt-card,
.audio-panel {
  padding: 16px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
}

.prompt-card h4,
.audio-panel h4,
.sample-card h4,
.response-card h5,
.turn h5,
.case-panel h4 {
  margin: 0;
}

.prompt-card h4,
.audio-panel h4,
.sample-card h4,
.case-panel h4 {
  font-size: 1.02rem;
  line-height: 1.25;
}

.prompt-card .topline,
.audio-panel .topline,
.sample-meta,
.turn-meta,
.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.transcript {
  margin: 12px 0;
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(16, 32, 51, 0.045);
  color: var(--ink);
  font-size: 0.96rem;
}

.transcript strong,
.query-block strong,
.context-block strong,
.insight strong {
  color: var(--ink);
}

.samples-block {
  margin-top: 18px;
}

.group-note {
  font-size: 0.94rem;
  color: var(--soft);
}

.tier-section {
  margin-top: 34px;
}

.tier-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 18px;
}

.tier-header h3 {
  margin: 0;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(1.45rem, 2vw, 1.8rem);
}

.sample-card {
  padding: 24px;
  display: grid;
  gap: 18px;
}

.sample-card header {
  display: grid;
  gap: 10px;
}

.sample-card h4 {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1.35rem;
  line-height: 1.15;
}

.context-block,
.query-block,
.expected-block,
.insight,
.source-block,
.help-block {
  padding: 14px 16px;
  border-radius: 16px;
  background: rgba(16, 32, 51, 0.045);
  color: var(--muted);
  font-size: 0.96rem;
}

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

.subcase-grid,
.audio-triptych,
.stack-responses {
  display: grid;
  gap: 16px;
}

.subcase-grid,
.audio-triptych {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.subcase-grid > * {
  height: 100%;
}

.subcase-grid .case-panel {
  display: grid;
  gap: 14px;
  align-content: start;
}

.audio-label {
  margin-bottom: 10px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink);
}

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

.response-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  display: grid;
  gap: 10px;
}

.response-card.good {
  background: linear-gradient(180deg, rgba(15, 118, 110, 0.1), rgba(255, 255, 255, 0.82));
  border-color: rgba(15, 118, 110, 0.22);
}

.response-card.bad {
  background: linear-gradient(180deg, rgba(180, 35, 24, 0.08), rgba(255, 255, 255, 0.82));
  border-color: rgba(180, 35, 24, 0.2);
}

.response-card.neutral {
  background: linear-gradient(180deg, rgba(29, 78, 216, 0.08), rgba(255, 255, 255, 0.82));
  border-color: rgba(29, 78, 216, 0.18);
}

.response-card.warning {
  background: linear-gradient(180deg, rgba(180, 83, 9, 0.1), rgba(255, 255, 255, 0.84));
  border-color: rgba(180, 83, 9, 0.24);
}

.response-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.response-title h5 {
  font-size: 1rem;
}

.response-model {
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--soft);
}

.response-text {
  color: var(--ink);
  font-size: 0.96rem;
  min-width: 0;
  overflow-wrap: anywhere;
}

.response-text code,
.context-block code,
.expected-block code,
.source-block code,
.compact-copy code {
  white-space: normal;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.timeline {
  display: grid;
  gap: 14px;
}

.turn {
  display: grid;
  gap: 10px;
  padding: 16px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
}

.turn-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.turn-index {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(29, 78, 216, 0.1);
  color: var(--accent-strong);
  font-weight: 800;
  flex: 0 0 auto;
}

.turn-copy {
  color: var(--ink);
  font-size: 0.96rem;
}

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

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

.placeholder-card {
  border-style: dashed;
  background: rgba(255, 255, 255, 0.72);
}

.placeholder-card .status-pill {
  margin-bottom: 8px;
}

.listening-shelf {
  margin-top: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.listening-shelf summary {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 24px;
  cursor: pointer;
  list-style: none;
}

.listening-shelf summary::-webkit-details-marker {
  display: none;
}

.listening-shelf summary::after {
  content: '+';
  margin-left: auto;
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1;
  color: var(--accent-strong);
}

.listening-shelf[open] summary {
  border-bottom: 1px solid var(--line);
}

.listening-shelf[open] summary::after {
  content: '−';
}

.summary-copy {
  display: grid;
  gap: 6px;
}

.shelf-kicker {
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--soft);
}

.shelf-title {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1.28rem;
  line-height: 1.15;
  color: var(--ink);
}

.shelf-count {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: rgba(29, 78, 216, 0.08);
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.shelf-body {
  padding: 20px 24px 24px;
  display: grid;
  gap: 18px;
}

.compact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.compact-card {
  display: grid;
  gap: 12px;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

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

.compact-card h4 {
  margin: 0;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 1.12rem;
  line-height: 1.2;
}

.compact-card p {
  margin: 0;
  color: var(--muted);
}

.compact-copy {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(16, 32, 51, 0.045);
  color: var(--ink);
  font-size: 0.94rem;
}

.compact-copy strong,
.compact-signal strong {
  color: var(--ink);
}

.compact-signal {
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  font-size: 0.92rem;
  color: var(--muted);
}

.compact-signal.good {
  background: linear-gradient(180deg, rgba(15, 118, 110, 0.08), rgba(255, 255, 255, 0.82));
  border-color: rgba(15, 118, 110, 0.2);
}

.compact-signal.bad {
  background: linear-gradient(180deg, rgba(180, 35, 24, 0.06), rgba(255, 255, 255, 0.82));
  border-color: rgba(180, 35, 24, 0.16);
}

.compact-pair {
  gap: 12px;
}

.footer {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  padding: 24px 0 40px;
  color: var(--soft);
  font-size: 0.92rem;
}

.footer a {
  color: var(--accent-strong);
}

@media (max-width: 1120px) {
  .overview-band,
  .prompt-groups,
  .samples-grid,
  .pillar-grid,
  .tier-grid,
  .case-grid,
  .compact-grid,
  .audio-pair,
  .comparison-grid,
  .response-grid,
  .quick-grid,
  .subcase-grid,
  .audio-triptych {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .metric-card,
  .tier-card,
  .pillar-card,
  .prompt-group,
  .sample-card,
  .placeholder-card,
  .case-panel,
  .comparison-card,
  .compact-card {
    padding: 20px;
  }

  .section {
    width: min(calc(100% - 24px), var(--max));
    padding: 28px 0;
  }

  .hero {
    padding-top: 36px;
  }

  .hero-title {
    font-size: clamp(2.4rem, 10vw, 3.2rem);
  }

  .listening-shelf summary,
  .shelf-body {
    padding-left: 20px;
    padding-right: 20px;
  }
}