:root {
  --navy-950: #0c1f3d;
  --navy-900: #142b50;
  --navy-800: #1f3a68;
  --navy-700: #345d91;
  --cyan-600: #1686a2;
  --cyan-500: #279ab3;
  --cyan-100: #dff2f5;
  --ink: #17253a;
  --slate: #5b6b78;
  --gray: #81909a;
  --line: #d8e1e6;
  --paper: #ffffff;
  --canvas: #f3f7f9;
  --shadow: 0 24px 70px rgba(20, 43, 80, 0.11);
  --radius-lg: 28px;
  --radius-md: 20px;
  --shell: min(1180px, calc(100% - 48px));
  color-scheme: light;
  font-family: Inter, Aptos, "Helvetica Neue", Arial, sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 16%, rgba(39, 154, 179, 0.08), transparent 28rem),
    linear-gradient(180deg, #fbfdfe 0%, var(--canvas) 82%, #eef3f6 100%);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.top-rule {
  display: grid;
  grid-template-columns: 5fr 1.6fr 1fr;
  height: 7px;
}

.top-rule span:nth-child(1) {
  background: var(--navy-800);
}

.top-rule span:nth-child(2) {
  background: var(--cyan-500);
}

.top-rule span:nth-child(3) {
  background: var(--gray);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding-block: 29px 25px;
}

.conference-link {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  text-decoration: none;
}

.conference-mark {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 12px;
  color: white;
  background: var(--navy-800);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow: 0 7px 18px rgba(31, 58, 104, 0.16);
}

.conference-link strong,
.conference-link small {
  display: block;
}

.conference-link strong {
  font-size: 0.9rem;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.conference-link small {
  margin-top: 2px;
  color: var(--slate);
  font-size: 0.72rem;
}

.event-meta {
  margin: 0;
  color: var(--slate);
  font-size: 0.88rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.event-meta span,
.eyebrow span,
.file-meta span {
  color: var(--cyan-500);
  padding-inline: 0.24em;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.72fr);
  min-height: 585px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  color: white;
  background:
    radial-gradient(circle at 74% 5%, rgba(39, 154, 179, 0.24), transparent 33%),
    linear-gradient(135deg, var(--navy-950) 0%, var(--navy-900) 50%, #173d65 100%);
  box-shadow: var(--shadow);
}

.hero::after {
  position: absolute;
  inset: auto 0 0;
  height: 8px;
  content: "";
  background: linear-gradient(90deg, var(--cyan-500) 0 28%, rgba(255, 255, 255, 0.12) 28% 100%);
}

.hero-copy {
  position: relative;
  z-index: 2;
  align-self: center;
  padding: 74px 48px 78px 72px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 17px;
  color: var(--cyan-500);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  line-height: 1.4;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(3.25rem, 6.1vw, 5.25rem);
  font-weight: 760;
  letter-spacing: -0.052em;
  line-height: 0.99;
  text-wrap: balance;
}

.subtitle {
  max-width: 690px;
  margin: 27px 0 0;
  color: #79d0df;
  font-size: clamp(1.4rem, 2.7vw, 2rem);
  font-weight: 430;
  letter-spacing: -0.02em;
  line-height: 1.22;
}

.presenter {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 49px;
}

.presenter-line {
  width: 45px;
  height: 2px;
  background: var(--cyan-500);
}

.presenter p {
  margin: 0;
  line-height: 1.35;
}

.presenter strong,
.presenter a {
  display: block;
}

.presenter strong {
  font-size: 1rem;
}

.presenter a {
  margin-top: 5px;
  color: #badce4;
  font-size: 0.84rem;
  text-decoration: none;
}

.hero-visual {
  position: relative;
  min-height: 100%;
  overflow: hidden;
  border-left: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(circle at 58% 44%, rgba(39, 154, 179, 0.18), transparent 34%),
    repeating-linear-gradient(0deg, transparent 0 38px, rgba(255, 255, 255, 0.018) 38px 39px),
    repeating-linear-gradient(90deg, transparent 0 38px, rgba(255, 255, 255, 0.018) 38px 39px);
}

.hero-visual::before,
.hero-visual::after {
  position: absolute;
  width: 1px;
  height: 260px;
  content: "";
  background: linear-gradient(transparent, rgba(77, 193, 215, 0.8), transparent);
  transform-origin: center;
}

.hero-visual::before {
  top: -15px;
  left: 53%;
  transform: rotate(52deg);
}

.hero-visual::after {
  top: 66px;
  left: 29%;
  transform: rotate(-48deg);
}

.visual-orbit {
  position: absolute;
  border: 1px solid rgba(99, 204, 222, 0.28);
  border-radius: 50%;
}

.orbit-one {
  top: -47px;
  right: -110px;
  width: 400px;
  height: 400px;
}

.orbit-two {
  top: 62px;
  right: -9px;
  width: 222px;
  height: 222px;
}

.node {
  position: absolute;
  z-index: 2;
  width: 13px;
  height: 13px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  background: var(--cyan-500);
  box-shadow: 0 0 0 8px rgba(39, 154, 179, 0.08);
}

.node-a {
  top: 87px;
  left: 32%;
}

.node-b {
  top: 169px;
  right: 13%;
}

.node-c {
  top: 226px;
  left: 44%;
  width: 9px;
  height: 9px;
}

.document-stack {
  position: absolute;
  right: 17%;
  bottom: 72px;
  width: 155px;
  height: 195px;
  border: 2px solid rgba(92, 200, 219, 0.75);
  border-radius: 5px;
  background: linear-gradient(150deg, rgba(39, 154, 179, 0.16), rgba(12, 31, 61, 0.75));
}

.document-stack::before {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 43px;
  height: 43px;
  border-bottom: 2px solid rgba(92, 200, 219, 0.75);
  border-left: 2px solid rgba(92, 200, 219, 0.75);
  content: "";
  background: var(--navy-900);
  clip-path: polygon(0 0, 100% 100%, 0 100%);
}

.document-stack.back {
  right: 8%;
  bottom: 111px;
  opacity: 0.36;
  transform: translate(5px, -20px);
}

.document-stack.front span {
  display: block;
  width: 67%;
  height: 3px;
  margin: 18px 0 0 25px;
  border-radius: 999px;
  background: rgba(173, 219, 229, 0.58);
}

.document-stack.front span:first-child {
  width: 42%;
  margin-top: 68px;
  background: var(--cyan-500);
}

.visual-label {
  position: absolute;
  z-index: 3;
  bottom: 70px;
  left: 12%;
  color: white;
  font-size: clamp(3.5rem, 7vw, 5.7rem);
  font-weight: 780;
  letter-spacing: -0.07em;
  line-height: 0.9;
}

.hero-visual > p {
  position: absolute;
  z-index: 3;
  bottom: 34px;
  left: 12%;
  margin: 0;
  color: #9bcbd5;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.study-overview {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(450px, 0.9fr);
  align-items: end;
  gap: 64px;
  padding-block: 90px 82px;
}

.overview-copy h2,
.section-heading h2,
.citation h2 {
  margin: 0;
  color: var(--navy-900);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 735;
  letter-spacing: -0.042em;
  line-height: 1.08;
}

.overview-copy > p:last-child {
  max-width: 650px;
  margin: 22px 0 0;
  color: var(--slate);
  font-size: 1.02rem;
  line-height: 1.78;
}

.study-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 0;
}

.study-stats div {
  min-height: 145px;
  padding: 27px 19px 22px;
  border: 1px solid rgba(52, 93, 145, 0.13);
  border-radius: 19px;
  background: rgba(255, 255, 255, 0.75);
}

.study-stats div:nth-child(2) {
  background: var(--cyan-100);
}

.study-stats dt {
  color: var(--navy-800);
  font-size: clamp(2.15rem, 4vw, 3.35rem);
  font-weight: 770;
  letter-spacing: -0.06em;
  line-height: 1;
}

.study-stats dd {
  margin: 16px 0 0;
  color: var(--slate);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.045em;
  line-height: 1.35;
  text-transform: uppercase;
}

.materials {
  padding: 65px 64px 68px;
  border: 1px solid rgba(31, 58, 104, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.93);
  box-shadow: 0 20px 60px rgba(20, 43, 80, 0.07);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 48px;
}

.section-heading > p {
  max-width: 370px;
  margin: 0 0 5px;
  color: var(--slate);
  font-size: 0.92rem;
  line-height: 1.6;
  text-align: right;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  margin-top: 45px;
}

.file-card {
  display: flex;
  min-height: 360px;
  flex-direction: column;
  padding: 29px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
}

.file-card--active {
  border-color: rgba(39, 154, 179, 0.36);
  background:
    linear-gradient(180deg, rgba(223, 242, 245, 0.53), transparent 42%),
    var(--paper);
}

.file-card--pending {
  background: #f7f9fa;
}

.file-card-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.file-icon {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 14px;
  color: white;
  background: var(--navy-800);
  font-size: 1rem;
  font-weight: 800;
}

.file-icon--muted {
  color: var(--navy-800);
  background: #e5ebef;
}

.status {
  padding: 7px 11px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
}

.status--ready {
  color: #0f6578;
  background: var(--cyan-100);
}

.status--pending {
  color: #687680;
  background: #e7ecef;
}

.file-copy {
  margin: 30px 0 28px;
}

.file-label {
  margin: 0 0 4px;
  color: var(--cyan-600);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.file-copy h3 {
  margin: 0;
  color: var(--navy-900);
  font-size: 1.55rem;
  letter-spacing: -0.025em;
}

.file-name {
  margin: 20px 0 0;
  overflow-wrap: anywhere;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
}

.file-meta {
  margin: 6px 0 0;
  color: var(--gray);
  font-size: 0.72rem;
  font-weight: 720;
  letter-spacing: 0.065em;
  text-transform: uppercase;
}

.download-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  min-height: 56px;
  margin-top: auto;
  padding: 0 19px;
  border-radius: 13px;
  color: white;
  background: var(--navy-800);
  font-size: 0.84rem;
  font-weight: 760;
  text-decoration: none;
  transition: background-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.download-button:hover {
  background: var(--navy-700);
  box-shadow: 0 10px 24px rgba(31, 58, 104, 0.15);
  transform: translateY(-2px);
}

.download-button > span:last-child {
  color: #86d5e3;
  font-size: 1.35rem;
}

.download-button--disabled {
  color: #6b7983;
  background: #e7ecef;
  cursor: default;
}

.download-button--disabled:hover {
  background: #e7ecef;
  box-shadow: none;
  transform: none;
}

.download-button--disabled > span:last-child {
  color: #9aa6ae;
}

.citation {
  display: grid;
  grid-template-columns: minmax(230px, 0.65fr) minmax(0, 1.35fr);
  gap: 72px;
  margin-top: 34px;
  padding: 49px 56px;
  border-radius: var(--radius-lg);
  color: white;
  background:
    radial-gradient(circle at 95% 0%, rgba(39, 154, 179, 0.2), transparent 35%),
    var(--navy-900);
}

.section-kicker--light {
  color: #6bc4d5;
}

.citation h2 {
  color: white;
  font-size: clamp(1.8rem, 3.5vw, 2.65rem);
}

.citation-copy {
  align-self: center;
}

.citation-copy > p:first-child {
  margin: 0;
  color: #d8e6ed;
  font-size: 0.91rem;
  line-height: 1.75;
}

.citation cite {
  color: white;
}

.copy-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 23px;
  padding: 11px 15px;
  border: 1px solid rgba(255, 255, 255, 0.19);
  border-radius: 11px;
  color: white;
  background: rgba(255, 255, 255, 0.08);
  font: inherit;
  font-size: 0.75rem;
  font-weight: 760;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease;
}

.copy-button:hover {
  border-color: rgba(107, 196, 213, 0.58);
  background: rgba(39, 154, 179, 0.17);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  padding-block: 34px 46px;
  color: var(--slate);
  font-size: 0.74rem;
}

.site-footer p {
  margin: 0;
}

.site-footer a {
  color: var(--navy-700);
  font-weight: 700;
  text-decoration: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--cyan-500);
  outline-offset: 4px;
}

@media (max-width: 980px) {
  :root {
    --shell: min(calc(100% - 36px), 860px);
  }

  .hero {
    grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.6fr);
    min-height: 545px;
  }

  .hero-copy {
    padding: 62px 32px 70px 47px;
  }

  .hero h1 {
    font-size: clamp(3rem, 7.2vw, 4.25rem);
  }

  .document-stack {
    right: 10%;
    width: 126px;
    height: 169px;
  }

  .document-stack.back {
    right: -1%;
  }

  .study-overview {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .study-stats {
    max-width: 670px;
  }

  .materials {
    padding: 52px 40px 44px;
  }

  .citation {
    gap: 44px;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
  }

  .site-header {
    align-items: flex-start;
    padding-block: 23px;
  }

  .conference-link strong {
    max-width: 270px;
  }

  .event-meta {
    max-width: 140px;
    text-align: right;
  }

  .hero {
    display: block;
    min-height: auto;
  }

  .hero-copy {
    padding: 60px 36px 62px;
  }

  .hero h1 {
    font-size: clamp(3rem, 12vw, 4.35rem);
  }

  .hero-visual {
    min-height: 310px;
    border-top: 1px solid rgba(255, 255, 255, 0.09);
    border-left: 0;
  }

  .document-stack {
    bottom: 54px;
  }

  .document-stack.back {
    bottom: 77px;
  }

  .visual-label {
    bottom: 76px;
  }

  .hero-visual > p {
    bottom: 43px;
  }

  .study-overview {
    padding-block: 72px 63px;
  }

  .section-heading {
    display: block;
  }

  .section-heading > p {
    max-width: 520px;
    margin: 17px 0 0;
    text-align: left;
  }

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

  .citation {
    grid-template-columns: 1fr;
    gap: 25px;
  }
}

@media (max-width: 560px) {
  :root {
    --shell: calc(100% - 24px);
    --radius-lg: 22px;
  }

  .top-rule {
    height: 6px;
  }

  .site-header {
    display: block;
  }

  .conference-link strong {
    max-width: none;
    font-size: 0.82rem;
  }

  .event-meta {
    max-width: none;
    margin: 16px 0 0 57px;
    text-align: left;
  }

  .hero-copy {
    padding: 48px 25px 54px;
  }

  .eyebrow {
    max-width: 240px;
    line-height: 1.7;
  }

  .hero h1 {
    font-size: clamp(2.7rem, 13.8vw, 3.55rem);
  }

  .subtitle {
    font-size: 1.35rem;
  }

  .presenter {
    margin-top: 39px;
  }

  .presenter-line {
    width: 30px;
  }

  .hero-visual {
    min-height: 270px;
  }

  .document-stack {
    right: 6%;
    bottom: 40px;
    width: 104px;
    height: 143px;
  }

  .document-stack.back {
    right: -3%;
    bottom: 64px;
  }

  .document-stack.front span {
    margin-left: 17px;
  }

  .document-stack.front span:first-child {
    margin-top: 50px;
  }

  .visual-label {
    bottom: 70px;
    font-size: 3.9rem;
  }

  .hero-visual > p {
    bottom: 36px;
    font-size: 0.67rem;
  }

  .study-overview {
    padding-block: 62px 56px;
  }

  .study-stats {
    grid-template-columns: 1fr;
  }

  .study-stats div {
    min-height: 0;
  }

  .materials {
    width: 100%;
    padding: 48px 24px 30px;
    border-radius: 0;
  }

  .file-card {
    min-height: 350px;
    padding: 24px;
  }

  .citation {
    padding: 40px 26px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 9px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}