:root {
  --bg: #ffffff;
  --bg-deep: #f3f6fa;
  --panel: rgba(255, 255, 255, 0.88);
  --panel-strong: #ffffff;
  --panel-border: rgba(86, 58, 37, 0.14);
  --ink: #24170f;
  --muted: #6e5a4a;
  --accent: #b75d32;
  --accent-strong: #8c3f1c;
  --accent-soft: #f3ceb1;
  --teal: #215d60;
  --gold: #d6a249;
  --line: rgba(61, 43, 29, 0.1);
  --shadow: 0 24px 80px rgba(48, 32, 21, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --max-width: 1240px;
  --font-sans: "Space Grotesk", sans-serif;
  --font-display: "Fraunces", serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.98), transparent 35%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 50%, var(--bg-deep) 100%);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.65;
  position: relative;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

p,
li,
figcaption,
small {
  color: var(--muted);
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-display);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.background-orb {
  position: fixed;
  border-radius: 999px;
  pointer-events: none;
  filter: blur(8px);
  opacity: 0.42;
}

.orb-one {
  top: -10rem;
  right: -8rem;
  width: 26rem;
  height: 26rem;
  background: radial-gradient(circle, rgba(183, 93, 50, 0.4), transparent 68%);
}

.orb-two {
  top: 28rem;
  left: -8rem;
  width: 22rem;
  height: 22rem;
  background: radial-gradient(circle, rgba(33, 93, 96, 0.28), transparent 68%);
}

.orb-three {
  bottom: -6rem;
  right: -4rem;
  width: 24rem;
  height: 24rem;
  background: radial-gradient(circle, rgba(214, 162, 73, 0.28), transparent 68%);
}

.page-frame {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  padding: 1.2rem 0 4rem;
  position: relative;
  z-index: 1;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.hero-panel,
.section-block,
.outro-panel {
  animation: fade-up 0.7s ease both;
}

.hero-panel {
  padding: 1.25rem;
  margin-bottom: 2.4rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.35rem 0.25rem 1.1rem;
}

.topbar-minimal {
  justify-content: flex-end;
}

.brand-mark {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.topbar-links {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.topbar-links a:not(.button-link) {
  font-size: 0.96rem;
  color: var(--muted);
}

.topbar-links a:not(.button-link):hover,
.authors-line a:hover,
.site-footer a:hover,
.back-link:hover {
  color: var(--accent-strong);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: start;
}

.hero-copy,
.hero-visual,
.feature-card,
.checklist-panel,
.prompt-panel,
.example-card,
.score-card,
.insight-card,
.artifact-card,
.impact-card,
.cta-card,
.sidebar-card,
.demo-stage {
  padding: 1.5rem;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.eyebrow,
.card-kicker {
  margin: 0;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-copy h1,
.demo-hero h1 {
  font-size: clamp(2.8rem, 5.4vw, 4.8rem);
  max-width: 11ch;
}

.hero-lead {
  margin: 0;
  font-size: 1.12rem;
  max-width: 46rem;
}

.hero-actions,
.demo-actions {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.button-link,
.action-button,
.letter-button {
  border: 0;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    background-color 0.2s ease,
    color 0.2s ease,
    border-color 0.2s ease;
}

.button-link,
.action-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.95rem 1.4rem;
  font-weight: 700;
}

.button-link:hover,
.action-button:hover,
.letter-button:hover {
  transform: translateY(-1px);
}

.button-link-solid,
.action-button.primary {
  background: linear-gradient(135deg, var(--accent) 0%, #d2864c 100%);
  color: #fff7f1;
  box-shadow: 0 14px 34px rgba(183, 93, 50, 0.26);
}

.button-link-ghost,
.action-button.secondary {
  background: rgba(255, 255, 255, 0.48);
  color: var(--ink);
  border: 1px solid rgba(86, 58, 37, 0.14);
}

.button-link-solid:hover,
.action-button.primary:hover {
  box-shadow: 0 18px 38px rgba(183, 93, 50, 0.32);
}

.authors-block {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.authors-line,
.affiliations-line {
  margin: 0;
}

.authors-line {
  font-size: 1rem;
  color: var(--ink);
}

.author-sep {
  margin: 0 0.6rem;
  color: rgba(110, 90, 74, 0.5);
}

.affiliations-line {
  font-size: 0.95rem;
}

.stat-ribbon {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: auto;
}

.stat-chip {
  padding: 1rem 1.05rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.54);
  border: 1px solid rgba(86, 58, 37, 0.1);
}

.stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1;
  color: var(--ink);
}

.stat-label {
  display: block;
  margin-top: 0.45rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  justify-content: flex-start;
}

.hero-figure {
  margin: 0;
  border-radius: calc(var(--radius-xl) - 6px);
  background: #f4f7fb;
  padding: 0.75rem;
}

.hero-figure img {
  width: 100%;
  height: auto;
  object-fit: contain;
  border-radius: calc(var(--radius-xl) - 12px);
}

.card-float {
  padding: 1.3rem 1.35rem;
}

.hero-answer-panel {
  margin-top: 0;
  padding-top: 1.3rem;
  border-top: 0;
}

.hero-answer-panel .answer-title {
  margin-top: 1rem;
}

.hero-letter-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.hero-demo-actions {
  margin-top: 1rem;
}

.hero-model-note {
  margin: 0.85rem 0 0;
  font-size: 0.95rem;
}

.card-float h2,
.feature-card h3,
.example-copy h3,
.artifact-card h3,
.impact-card h3,
.cta-card h3,
.sidebar-card h3,
.prompt-panel h3,
.outro-panel h2,
.demo-stage h2 {
  font-size: clamp(1.6rem, 2.4vw, 2.15rem);
  margin-top: 0.2rem;
}

.card-float p,
.feature-card p,
.example-copy p,
.artifact-card p,
.impact-card p,
.method-note-panel p,
.cta-card p,
.sidebar-copy,
.outro-panel p,
.prompt-note,
.figure-panel figcaption,
.score-note {
  margin: 0.75rem 0 0;
}

.section-block {
  margin-top: 2rem;
}

.section-heading {
  margin-bottom: 1rem;
}

.section-heading h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  margin-top: 0.3rem;
  max-width: 15ch;
}

.section-side-note {
  max-width: 44rem;
  margin: 0.65rem 0 0;
  font-size: 1rem;
}

.feature-grid {
  display: grid;
  gap: 1rem;
}

.three-up {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card {
  border-radius: var(--radius-lg);
}

.method-layout {
  display: block;
}

.figure-panel {
  padding: 1rem;
}

.figure-panel img {
  border-radius: calc(var(--radius-lg) - 8px);
  width: 100%;
}

.figure-panel figcaption {
  font-size: 0.95rem;
}

.stacked-panels {
  display: grid;
  gap: 1rem;
}

.checklist-panel,
.prompt-panel {
  border-radius: var(--radius-lg);
}

.caption-title {
  color: var(--ink);
  font-weight: 700;
}

.number-list,
.plain-list {
  margin: 0.85rem 0 0;
  padding-left: 1.2rem;
}

.number-list li,
.plain-list li {
  margin-bottom: 0.65rem;
}

.plain-list {
  list-style: disc;
}

.prompt-box,
.citation-block {
  margin-top: 0.9rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  background: #2b1f18;
  color: #f8ecdf;
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
  overflow-x: auto;
}

.example-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.single-stack {
  grid-template-columns: 1fr;
}

.example-card {
  border-radius: var(--radius-lg);
}

.example-pair,
.pair-showcase {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.example-pair figure,
.image-card {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: #e4dbcf;
}

.example-pair figcaption,
.frame-label {
  position: absolute;
  top: 0.85rem;
  left: 0.85rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(36, 23, 15, 0.78);
  color: #fff9f1;
  font-size: 0.84rem;
  backdrop-filter: blur(6px);
  z-index: 1;
}

.example-pair img,
.image-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.75rem;
  border-radius: 999px;
  font-size: 0.86rem;
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink);
  border: 1px solid rgba(86, 58, 37, 0.1);
}

.tag-accent {
  background: rgba(183, 93, 50, 0.12);
  color: var(--accent-strong);
}

.results-summary,
.artifact-layout,
.impact-visual-layout {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.result-note-panel {
  margin-top: 1rem;
  padding: 1.2rem 1.4rem;
  border-radius: var(--radius-lg);
}

.paper-table-panel {
  padding: 1.2rem 1.2rem 1rem;
  border-radius: var(--radius-lg);
}

.table-wrap {
  margin-top: 0.85rem;
  overflow-x: auto;
}

.paper-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 760px;
  font-size: 0.95rem;
}

.paper-table th,
.paper-table td {
  padding: 0.8rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid rgba(86, 58, 37, 0.1);
  color: var(--muted);
}

.paper-table th {
  color: var(--ink);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.paper-table td:nth-child(2),
.paper-table td:nth-child(4) {
  color: var(--ink);
  font-weight: 700;
}

.paper-table td:nth-child(2) {
  border-right: 2px solid rgba(86, 58, 37, 0.24);
  padding-right: 1.15rem;
}

.paper-table td:nth-child(3) {
  padding-left: 1.15rem;
}

.paper-table .table-emphasis-top {
  border-top: 3px solid rgba(86, 58, 37, 0.42);
}

.paper-table .table-emphasis-bottom {
  border-bottom: 3px solid rgba(86, 58, 37, 0.42);
}

.table-caption {
  margin: 0.8rem 0 0;
  font-size: 0.95rem;
}

.full-figure {
  margin-top: 1rem;
}

.score-card,
.insight-card,
.artifact-card,
.impact-card,
.cta-card,
.sidebar-card {
  border-radius: var(--radius-lg);
}

.score-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: center;
  margin-top: 1rem;
}

.score-divider {
  width: 1px;
  align-self: stretch;
  background: linear-gradient(180deg, transparent, rgba(86, 58, 37, 0.15), transparent);
}

.score-value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  line-height: 0.95;
}

.score-value.human {
  color: var(--accent-strong);
}

.score-value.model {
  color: var(--teal);
}

.score-label {
  display: block;
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.chart-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 1rem;
}

.chart-card {
  border-radius: var(--radius-lg);
}

.chart-wide {
  grid-column: span 2;
}

.impact-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

.citation-panel {
  padding: 1rem;
}

.citation-block {
  margin: 0;
}

.inline-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--accent-strong);
  font-size: 0.95em;
}

.site-footer {
  padding: 1.4rem 0 0.5rem;
  text-align: center;
}

.site-footer p {
  margin: 0;
  font-size: 0.95rem;
}

.demo-frame {
  padding-top: 1rem;
}

.demo-hero {
  padding: 1.3rem;
}

.demo-hero-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.back-link,
.demo-badge,
.progress-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(86, 58, 37, 0.1);
  color: var(--muted);
  font-size: 0.92rem;
}

.demo-badge {
  color: var(--accent-strong);
  font-weight: 700;
}

.demo-hero-copy {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 1.3rem;
  align-items: end;
  margin-top: 1.2rem;
}

.compact-grid {
  margin-top: 1.1rem;
}

.mini-card {
  padding: 1.15rem 1.2rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid rgba(86, 58, 37, 0.1);
}

.mini-card p:last-child {
  margin: 0.55rem 0 0;
}

.demo-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(20rem, 0.65fr);
  gap: 1rem;
  margin-top: 1rem;
}

.demo-stage {
  border-radius: var(--radius-xl);
}

.demo-stage-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.demo-stage-head h2 {
  max-width: 18ch;
}

.pair-showcase {
  margin-top: 1rem;
}

.image-card {
  aspect-ratio: 4 / 3;
}

.answer-panel {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.answer-title {
  margin: 0;
  color: var(--ink);
  font-weight: 700;
}

.letter-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1rem;
}

.letter-button {
  padding: 0.85rem 0;
  background: rgba(255, 255, 255, 0.65);
  color: var(--ink);
  border: 1px solid rgba(86, 58, 37, 0.12);
  font-weight: 700;
}

.letter-button.is-selected {
  background: rgba(183, 93, 50, 0.16);
  border-color: rgba(183, 93, 50, 0.45);
  color: var(--accent-strong);
  box-shadow: inset 0 0 0 1px rgba(183, 93, 50, 0.12);
}

.letter-button.is-correct {
  background: rgba(33, 93, 96, 0.12);
  border-color: rgba(33, 93, 96, 0.4);
  color: var(--teal);
  box-shadow: inset 0 0 0 1px rgba(33, 93, 96, 0.12);
}

.letter-button.is-incorrect {
  background: rgba(183, 93, 50, 0.12);
  border-color: rgba(183, 93, 50, 0.4);
  color: var(--accent-strong);
}

.letter-button:disabled {
  cursor: default;
  opacity: 0.82;
}

.feedback-box {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(86, 58, 37, 0.08);
  font-weight: 500;
}

.feedback-neutral {
  background: rgba(255, 255, 255, 0.62);
  color: var(--muted);
}

.feedback-correct {
  background: rgba(33, 93, 96, 0.12);
  color: var(--teal);
}

.feedback-incorrect {
  background: rgba(183, 93, 50, 0.12);
  color: var(--accent-strong);
}

.demo-sidebar {
  display: grid;
  gap: 1rem;
}

.score-stack {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 0.9rem;
}

.score-bubble {
  display: grid;
  place-items: center;
  padding: 1.15rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(86, 58, 37, 0.1);
}

.score-bubble span {
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 0.95;
}

.score-bubble small {
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.compact-list li {
  margin-bottom: 0.45rem;
}

.reveal-card {
  min-height: 12rem;
}

.outro-panel {
  margin-top: 1rem;
  padding: 1.5rem;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1100px) {
  .hero-grid,
  .demo-layout,
  .demo-hero-copy,
  .results-summary,
  .artifact-layout,
  .impact-visual-layout {
    grid-template-columns: 1fr;
  }

  .stat-ribbon,
  .impact-grid,
  .three-up {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .chart-wide {
    grid-column: auto;
  }
}

@media (max-width: 760px) {
  .page-frame {
    width: min(calc(100% - 1rem), var(--max-width));
    padding-bottom: 2.8rem;
  }

  .hero-panel,
  .demo-hero {
    padding: 1rem;
  }

  .hero-panel {
    margin-bottom: 2rem;
  }

  .hero-copy,
  .hero-visual,
  .feature-card,
  .checklist-panel,
  .prompt-panel,
  .example-card,
  .score-card,
  .insight-card,
  .artifact-card,
  .impact-card,
  .cta-card,
  .sidebar-card,
  .demo-stage,
  .outro-panel {
    padding: 1.15rem;
  }

  .topbar,
  .demo-stage-head,
  .demo-hero-top {
    flex-direction: column;
    align-items: start;
  }

  .topbar-links {
    gap: 0.7rem;
  }

  .hero-copy h1,
  .demo-hero h1 {
    max-width: none;
  }

  .stat-ribbon,
  .three-up,
  .impact-grid,
  .example-grid,
  .example-pair,
  .pair-showcase,
  .score-row,
  .score-stack {
    grid-template-columns: 1fr;
  }

  .score-divider {
    width: 100%;
    height: 1px;
  }

  .letter-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .hero-letter-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .button-link,
  .action-button {
    width: 100%;
  }

  .paper-table {
    min-width: 640px;
  }

  .letter-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .hero-letter-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .brand-mark {
    letter-spacing: 0.08em;
  }
}