:root {
  --bg: #f5efe6;
  --bg-strong: #fffaf4;
  --panel: rgba(255, 250, 244, 0.86);
  --panel-strong: #fffdf8;
  --ink: #132b35;
  --muted: #5d6a71;
  --accent: #b45832;
  --accent-dark: #8d3d21;
  --accent-soft: #f2ded0;
  --teal: #2d6a73;
  --line: rgba(19, 43, 53, 0.12);
  --shadow: 0 22px 60px rgba(22, 40, 49, 0.12);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --header-height: 72px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  position: relative;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0) 24%),
    var(--bg);
  color: var(--ink);
  font-family: 'Avenir Next', 'Segoe UI', 'Helvetica Neue', sans-serif;
  line-height: 1.65;
}

body::before,
body::after {
  content: '';
  position: fixed;
  pointer-events: none;
  z-index: 0;
}

body::before {
  top: -8rem;
  right: -6rem;
  width: 32rem;
  height: 32rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 106, 115, 0.18), rgba(45, 106, 115, 0) 68%);
}

body::after {
  bottom: -10rem;
  left: -8rem;
  width: 30rem;
  height: 30rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(180, 88, 50, 0.16), rgba(180, 88, 50, 0) 70%);
}

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

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

main,
.site-header,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(245, 239, 230, 0.84);
  border-bottom: 1px solid rgba(19, 43, 53, 0.08);
}

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

.brand {
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-size: 0.95rem;
}

.site-nav a {
  position: relative;
  padding: 8px 0;
  color: var(--muted);
  transition: color 0.25s ease;
}

.site-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a.is-active::after {
  transform: scaleX(1);
}

.section-shell {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 88px 24px 0;
}

.hero {
  padding-top: 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(320px, 0.98fr);
  grid-template-areas:
    "title media"
    "meta logos";
  gap: 28px 32px;
  align-items: start;
}

.hero-title-wrap {
  grid-area: title;
  min-width: 0;
}

.hero-media {
  grid-area: media;
}

.hero-meta {
  grid-area: meta;
}

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

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent-dark);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.page-title,
.section-heading h2,
.quote-text,
.metric-card strong,
.stat-card strong {
  font-family: 'Iowan Old Style', 'Palatino Linotype', 'Book Antiqua', Georgia, serif;
}

.page-title {
  margin: 0;
  font-size: clamp(2.8rem, 5vw, 4.7rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.hero-authors {
  margin: 0;
}

.hero-meta {
  min-width: 0;
}

.author-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  align-items: center;
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 700;
}

.author-name {
  white-space: nowrap;
}

.author-name sup {
  font-size: 0.68em;
  vertical-align: super;
}

.author-sep {
  color: rgba(19, 43, 53, 0.38);
  font-weight: 700;
}

.affiliation-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.affiliation-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 600;
}

.affiliation-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.8rem;
  font-weight: 800;
}

.logo-strip {
  display: grid;
  gap: 16px;
}

.logo-strip-side {
  grid-area: logos;
  grid-template-columns: 1fr;
  align-content: start;
}

.logo-card {
  min-height: 112px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
}

.logo-card img {
  width: auto;
  max-width: 100%;
  object-fit: contain;
}

.logo-cmu {
  max-height: 58px;
}

.logo-icl {
  max-height: 88px;
}

.logo-siemens {
  max-height: 50px;
}

.hero-summary {
  max-width: 58ch;
  margin: 24px 0 0;
  font-size: 1.08rem;
}

.hero-actions,
.paper-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 700;
  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease,
    background 0.25s ease,
    border-color 0.25s ease;
}

.button-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 28px rgba(22, 40, 49, 0.14);
}

.button-primary {
  background: var(--accent);
  color: #fffaf6;
}

.button-primary:hover {
  background: var(--accent-dark);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.72);
  border-color: var(--line);
  color: var(--ink);
}

.button-secondary:hover {
  background: #fffdf8;
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.hero-chips span {
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 600;
}

.hero-media {
  padding: 22px;
}

.media-label,
.definition-label,
.paper-label {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--teal);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 0;
  border-radius: calc(var(--radius-lg) - 4px);
  background: #000;
}

.media-caption {
  margin: 14px 6px 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.68fr) minmax(0, 1fr);
  gap: 24px;
  align-items: end;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
}

.overview-grid,
.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.quote-card,
.prose-card,
.definition-card,
.metric-card,
.stat-card,
.highlight-card,
.paper-card,
.callout-card,
.step-card {
  padding: 28px;
}

.quote-text {
  margin: 0;
  font-size: 1.75rem;
  line-height: 1.18;
}

.quote-note,
.highlight-card p,
.step-card p,
.definition-card p,
.paper-card p,
.callout-card p,
.metric-card p,
.stat-card p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.prose-card p {
  margin: 0;
}

.prose-card p + p {
  margin-top: 16px;
}

.figure-panel {
  margin: 28px 0 0;
  overflow: hidden;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

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

.figure-panel figcaption {
  padding: 18px 22px 22px;
  color: var(--muted);
  font-size: 0.95rem;
}

.card-grid {
  display: grid;
  gap: 24px;
  margin-top: 28px;
}

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

.highlight-card h3,
.step-card h3,
.definition-card h3,
.paper-card h3,
.callout-card h3 {
  margin: 0;
  font-size: 1.18rem;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-top: 6px;
}

.step-card {
  position: relative;
  overflow: hidden;
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.95rem;
  font-weight: 800;
}

.glossary-stack {
  display: grid;
  gap: 20px;
}

.metrics-grid,
.stats-grid,
.callout-row {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

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

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

.metric-card,
.stat-card,
.callout-card {
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.metric-card span,
.stat-card span {
  display: block;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.metric-card strong,
.stat-card strong {
  display: block;
  margin-top: 12px;
  font-size: clamp(1.65rem, 2vw, 2.25rem);
  line-height: 1.05;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 28px;
}

.gallery-grid .figure-panel {
  margin: 0;
  height: 100%;
}

.paper-card {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) auto;
  gap: 24px;
  align-items: center;
}

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 54px 24px 72px;
  color: var(--muted);
  font-size: 0.95rem;
}

.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.js-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1080px) {
  .hero-grid,
  .section-heading,
  .overview-grid,
  .two-column,
  .gallery-grid,
  .callout-row,
  .paper-card {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    grid-template-areas:
      "title"
      "media"
      "meta"
      "logos";
  }

  .logo-strip-side {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .steps-grid,
  .metrics-grid,
  .stats-grid,
  .card-grid-three {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .site-header {
    position: static;
  }

  .header-inner {
    padding: 18px;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
    gap: 14px;
    font-size: 0.9rem;
  }

  .section-shell {
    padding: 64px 18px 0;
  }

  .hero {
    padding-top: 32px;
  }

  .page-title {
    font-size: clamp(2.3rem, 12vw, 3.4rem);
  }

  .quote-text {
    font-size: 1.45rem;
  }

  .hero-media {
    padding: 16px;
  }

  .logo-strip-side {
    grid-template-columns: 1fr;
  }

  .logo-card {
    min-height: 90px;
  }

  .logo-cmu {
    max-height: 48px;
  }

  .logo-icl {
    max-height: 74px;
  }

  .logo-siemens {
    max-height: 42px;
  }

  .steps-grid,
  .metrics-grid,
  .stats-grid,
  .gallery-grid,
  .card-grid-three,
  .callout-row {
    grid-template-columns: 1fr;
  }

  .hero-actions,
  .paper-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button-link {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .js-ready [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .button-link:hover {
    transform: none;
    box-shadow: none;
  }
}