:root {
  --bg: #f2ede3;
  --surface: rgba(255, 255, 255, 0.74);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --surface-dark: #112126;
  --text: #122129;
  --muted: #596970;
  --line: rgba(17, 33, 38, 0.12);
  --line-strong: rgba(17, 33, 38, 0.2);
  --accent: #a25f36;
  --accent-strong: #824a28;
  --accent-soft: rgba(162, 95, 54, 0.1);
  --shadow: 0 28px 80px rgba(25, 34, 37, 0.12);
  --shadow-soft: 0 18px 48px rgba(25, 34, 37, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --content-width: min(1180px, calc(100vw - 40px));
  --heading-font: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --body-font: "Aptos", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: var(--body-font);
  background:
    radial-gradient(circle at top left, rgba(146, 174, 171, 0.35), transparent 36%),
    radial-gradient(circle at 85% 14%, rgba(162, 95, 54, 0.18), transparent 22%),
    linear-gradient(180deg, #f6f1e8 0%, var(--bg) 48%, #ece5d9 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(17, 33, 38, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 33, 38, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.42), transparent 88%);
}

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

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

button {
  font: inherit;
}

.site-shell {
  width: var(--content-width);
  margin: 0 auto;
  padding-bottom: 48px;
}

.topbar {
  position: sticky;
  top: 18px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(920px, calc(100vw - 40px));
  margin: 18px auto 0;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(247, 243, 236, 0.66);
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 30px rgba(17, 33, 38, 0.08);
}

.brand {
  font-family: var(--heading-font);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.section-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.section-nav a {
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.93rem;
  transition: background-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.section-nav a:hover,
.section-nav a:focus-visible,
.section-nav a.is-active {
  background: rgba(17, 33, 38, 0.08);
  color: var(--text);
}

.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 104px 0 54px;
  align-items: start;
}

.hero-copy {
  display: grid;
  gap: 18px;
  max-width: min(980px, 100%);
}

.eyebrow {
  margin: 0;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

h1,
h2,
h3,
.video-card__title {
  margin: 0;
  font-family: var(--heading-font);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.7rem, 4.4vw, 4.9rem);
  line-height: 0.95;
  max-width: 18ch;
  text-wrap: balance;
}

h2 {
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.02;
}

h3 {
  font-size: 1.35rem;
  line-height: 1.15;
}

.hero-tagline,
.method-copy p,
.reading-panel p,
.group-intro,
.video-card__caption,
.video-modal__meta p,
.page-footer p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
  font-size: 1rem;
}

.hero-tagline {
  max-width: 60ch;
  font-size: 1.04rem;
}

.author-block {
  display: grid;
  gap: 10px;
  padding-top: 2px;
}

.institution-badge {
  display: none;
}

.institution-badge.is-visible {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
  margin-top: 4px;
  padding: 10px 14px 10px 10px;
  border: 1px solid rgba(17, 33, 38, 0.1);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.48);
  box-shadow: 0 12px 26px rgba(17, 33, 38, 0.06);
}

.institution-badge__mark {
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid rgba(17, 33, 38, 0.08);
  object-fit: contain;
}

.institution-badge__copy {
  display: grid;
  gap: 2px;
}

.institution-badge__label {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.institution-badge__name {
  color: var(--text);
  font-size: 0.94rem;
  line-height: 1.2;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  font-size: 1rem;
}

.author {
  color: var(--text);
}

.author sup,
.affiliation sup {
  color: var(--accent-strong);
  font-size: 0.72em;
  font-weight: 700;
}

.affiliations {
  display: grid;
  gap: 8px;
}

.affiliation,
.correspondence {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 4px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
}

.button--primary {
  background: var(--surface-dark);
  color: #f8f4ed;
  box-shadow: var(--shadow-soft);
}

.button--ghost {
  background: rgba(255, 255, 255, 0.48);
  border-color: var(--line);
  color: var(--text);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding-top: 8px;
}

.metric-card {
  padding: 18px 18px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.metric-card strong {
  display: block;
  margin-bottom: 8px;
  font-family: var(--heading-font);
  font-size: 1.65rem;
  color: var(--text);
}

.metric-card span {
  display: block;
  color: var(--muted);
  line-height: 1.45;
  font-size: 0.93rem;
}

.hero-video-frame,
.method-figure-frame,
.reading-panel,
.video-card,
.video-modal__dialog {
  border: 1px solid var(--line);
  background: var(--surface-strong);
  box-shadow: var(--shadow);
}

.hero-video-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
}

.hero-video-frame::before {
  display: none;
}

.hero-video {
  aspect-ratio: 16 / 9;
  width: 100%;
  object-fit: cover;
  background: linear-gradient(135deg, #112126, #23353b);
}

.section {
  padding: 46px 0;
}

.section-heading {
  display: grid;
  gap: 8px;
  margin-bottom: 22px;
}

.reading-panel {
  padding: 28px 32px;
  border-radius: var(--radius-lg);
}

.reading-panel p {
  font-size: 1.02rem;
}

.bibtex-panel {
  padding: 24px 28px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  box-shadow: var(--shadow-soft);
}

.bibtex-intro {
  margin: 0 0 14px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 0.98rem;
}

.bibtex-entry {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid rgba(17, 33, 38, 0.08);
  background: rgba(255, 255, 255, 0.58);
  color: var(--text);
  font-family: Consolas, "SFMono-Regular", "Liberation Mono", Menlo, monospace;
  font-size: 0.94rem;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.method-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
  justify-items: start;
  text-align: left;
}

.method-copy {
  display: grid;
  gap: 20px;
  max-width: min(980px, 100%);
  justify-items: start;
}

.method-highlights {
  display: grid;
  gap: 12px;
  width: min(880px, 100%);
}

.method-chip {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.54);
  box-shadow: var(--shadow-soft);
  text-align: left;
}

.method-chip strong {
  display: block;
  margin-bottom: 4px;
  color: var(--text);
  font-size: 1rem;
}

.method-chip span {
  display: block;
  color: var(--muted);
  line-height: 1.6;
  font-size: 0.94rem;
}

.method-figure-frame {
  padding: 28px 28px 22px;
  border-radius: var(--radius-xl);
  width: min(1120px, 100%);
  justify-self: start;
  display: flex;
  justify-content: center;
  align-items: center;
}

.method-figure-frame img {
  width: min(100%, 1040px);
  height: auto;
  margin: 0 auto;
}

.experiment-groups {
  display: grid;
  gap: 34px;
}

.experiment-group {
  display: grid;
  gap: 18px;
}

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

.group-header h3 {
  font-size: 1.7rem;
}

.group-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 18px;
}

.video-card {
  position: relative;
  grid-column: span 4;
  display: grid;
  overflow: hidden;
  border-radius: var(--radius-lg);
  transition: transform 220ms ease, box-shadow 220ms ease, border-color 220ms ease;
}

.video-card:hover,
.video-card:focus-within {
  transform: translateY(-5px);
  border-color: var(--line-strong);
  box-shadow: 0 32px 70px rgba(17, 33, 38, 0.16);
}

.video-card--featured {
  grid-column: 1 / -1;
  grid-template-columns: minmax(0, 1.18fr) minmax(280px, 0.82fr);
}

.video-card__visual {
  position: relative;
  background: linear-gradient(135deg, #112126, #35535d);
}

.video-card__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(17, 33, 38, 0) 38%, rgba(17, 33, 38, 0.65) 100%);
  pointer-events: none;
}

.video-card__video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.video-card__meta {
  display: grid;
  gap: 12px;
  padding: 20px 22px 22px;
}

.video-card__title {
  font-size: 1.35rem;
  line-height: 1.15;
  color: var(--text);
}

.video-card__caption {
  font-size: 0.96rem;
}

.video-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.video-card__tag {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 28px;
  padding: 0 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.77rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.video-card__open {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--text);
  cursor: pointer;
  transition: transform 180ms ease, background-color 180ms ease;
}

.video-card__open:hover,
.video-card__open:focus-visible {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.82);
}

.video-card__hint {
  position: absolute;
  right: 14px;
  bottom: 14px;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(17, 33, 38, 0.58);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #f6f1e8;
  font-size: 0.82rem;
  font-weight: 600;
}

.video-modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 28px;
}

.video-modal[hidden] {
  display: none;
}

.video-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 17, 22, 0.68);
  backdrop-filter: blur(12px);
}

.video-modal__dialog {
  position: relative;
  z-index: 1;
  width: min(1100px, calc(100vw - 32px));
  border-radius: 30px;
  overflow: hidden;
}

.video-modal__content {
  display: grid;
}

.video-modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 2;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(17, 33, 38, 0.72);
  color: #f7f2eb;
  cursor: pointer;
}

.video-modal__player {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #081015;
}

.video-modal__meta {
  display: grid;
  gap: 8px;
  padding: 18px 22px 24px;
}

.video-modal__eyebrow {
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.page-footer {
  padding: 18px 0 0;
}

.page-footer p {
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 0.94rem;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 620ms ease, transform 620ms ease;
}

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

@media (max-width: 1120px) {
  .hero {
    padding-top: 84px;
  }
}

@media (max-width: 900px) {
  .topbar {
    width: calc(100vw - 24px);
    padding: 12px 14px;
    border-radius: 24px;
    align-items: flex-start;
  }

  .section-nav {
    justify-content: flex-end;
  }

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

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

  .video-card,
  .video-card--featured {
    grid-column: auto;
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  :root {
    --content-width: calc(100vw - 24px);
  }

  .topbar {
    position: static;
    margin-top: 12px;
  }

  .hero {
    gap: 24px;
    padding: 44px 0 26px;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: 18ch;
  }

  .reading-panel,
  .method-figure-frame,
  .video-card__meta {
    padding-left: 18px;
    padding-right: 18px;
  }

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

  .button {
    width: 100%;
  }

  .video-modal {
    padding: 10px;
  }

  .video-modal__dialog {
    border-radius: 20px;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}