@import url("https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css");

:root {
  --color-text: #313131;
  --color-muted: #585553;
  --color-paper: #e9ded4;
  --color-yellow: #fbce51;
  --color-red: #f54932;
  --color-blue: #3057a2;
  --font-body: "Golos Text", Arial, sans-serif;
  --font-title: "Merriweather", Georgia, serif;
  --container: min(100% - 40px, 1222px);
  --ticker-height: 0px;
  --scene-scale: 1;
}

* {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
}

body {
  color: var(--color-text);
  font-family: var(--font-body), serif;
  background: #fff;
}

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

button {
  font: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid #4a90e2;
  outline-offset: 3px;
}

.page {
  width: 100%;
  overflow-x: clip;
}

/* ---------- marquee (ticker) ---------- */
.ticker {
  position: relative;
  z-index: 5;
  display: flex;
  width: 100%;
  overflow: hidden;
  background: var(--color-red);
}

.ticker--hero-inside {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
}

.ticker--footer-inside {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
}

.ticker--top-outside,
.ticker--bottom-outside {
  display: none;
}

.ticker__track {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: max-content;
  min-width: max-content;
  padding: 10px 12px;
  animation: marquee 26s linear infinite;
  will-change: transform;
}

.ticker:hover .ticker__track {
  animation-play-state: paused;
}

.ticker__text {
  margin: 0;
  font: 400 16px/18px var(--font-title);
  color: #fff;
  white-space: nowrap;
  text-transform: uppercase;
}

.ticker__dot {
  flex: 0 0 6px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #fff;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  width: 100%;
  height: 812px;
  overflow: hidden;
  background: var(--color-paper);
}

.hero__texture-layer {
  position: absolute;
  inset: 0;
  z-index: 2;
  overflow: hidden;
  mix-blend-mode: multiply;
  opacity: 0.4;
  pointer-events: none;
}

.hero__texture-image {
  position: absolute;
  top: 50%;
  left: 50%;
  width: auto;
  height: 100%;
  min-width: 100%;
  transform: translate(-50%, -50%);
  object-fit: cover;
}

.hero__scene,
.hero__foreground-figures {
  position: absolute;
  bottom: var(--ticker-height, 0px);
  left: 50%;
  transform: translateX(-50%) scale(var(--scene-scale, 1));
  transform-origin: bottom center;
}

.hero__scene {
  z-index: 1;
  width: 375px;
  height: 812px;
}

.hero__foreground {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}

.hero__foreground > * {
  pointer-events: auto;
}

.hero__foreground-figures {
  width: 375px;
  height: 812px;
  pointer-events: none;
}

.hero__ellipse {
  position: absolute;
  top: 406px;
  left: 180px;
  width: 300px;
  height: 300px;
  transform: translateX(-50%);
  background: var(--color-yellow);
  border-radius: 50%;
}

.hero__ellipse-text {
  position: absolute;
  inset: 0;
  color: #000;
  mix-blend-mode: overlay;
}

.hero__ellipse-text-path {
  font: 400 28px var(--font-title);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.hero__chess-piece,
.hero__city {
  position: absolute;
}

.hero__chess-piece--queen {
  top: 502px;
  left: 227px;
  width: 64px;
  height: 101px;
  rotate: 8deg;
}

.hero__chess-piece--king {
  top: 544px;
  left: 65px;
  width: 56px;
  height: 116px;
}

.hero__chess-piece--knight {
  top: 658px;
  left: 145px;
  width: 100px;
  height: 114px;
}

.hero__chess-piece--pawn {
  top: 558px;
  left: 1233px;
  width: 85px;
  height: 122px;
}

.hero__city {
  top: 389px;
  left: -500px;
  width: 1066px;
  height: 383px;
}

.hero__logo {
  position: relative;
  top: 18px;
  left: max(20px, calc((100vw - 545px) / 2));
  display: block;
  width: 213px;
  height: 32px;
  color: var(--color-muted);
}

.hero__logo-mark {
  position: absolute;
  inset: 0 auto 0 0;
  width: 80px;
}

.hero__logo-icon {
  position: absolute;
  top: 2px;
  height: 30px;
}

.hero__logo-icon:nth-child(1) { left: 0; }
.hero__logo-icon:nth-child(2) { left: 20px; }
.hero__logo-icon:nth-child(3) { left: 40px; }
.hero__logo-icon:nth-child(4) { left: 60px; }

.hero__logo-title {
  position: absolute;
  top: 0;
  left: 85px;
  display: flex;
  flex-direction: column;
  font: 700 14px/16px var(--font-body);
  letter-spacing: 0.02rem;
}

.hero__content {
  position: relative;
  width: min(100% - 40px, 542px);
  margin: 57px auto 0;
}

.hero__headline-title {
  display: flex;
  flex-direction: column;
  margin: 0;
  font: 400 clamp(31px, 8.4vw, 60px)/1.11 var(--font-title);
  color: var(--color-text);
  text-transform: uppercase;
}

.hero__headline-line {
  letter-spacing: 0.04rem;
  white-space: nowrap;
}

.hero__headline-line--3 {
  width: 64%;
  margin-left: 18.7%;
  text-align: right;
}

.hero__headline-line--4 {
  width: 92%;
  margin-left: 8%;
  text-align: right;
}

.hero__subtitle {
  max-width: 542px;
  margin: 23px 0 0;
  font: 400 18px/23px var(--font-body);
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 32px;
}

.hero__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 47px;
  padding: 13px 20px;
  border-radius: 66px;
  font: 500 16px/20px var(--font-body);
  text-align: center;
}

.hero__cta--primary {
  background: #1f1f1f;
  color: #fff;
}

.hero__cta--secondary {
  background: rgba(255, 255, 255, 0.9);
  color: #1f1f1f;
}

.desktop-break {
  display: none;
}

/* ---------- content sections ---------- */
.lecture-section,
.support-heading,
.stages,
.participants {
  width: var(--container);
  margin: 0 auto;
}

.lecture-section {
  padding-top: clamp(48px, 7vw, 109px);
  display: grid;
  gap: clamp(24px, 4vw, 64px);
}

.lecture-section__heading {
  margin: 0;
  font: 400 clamp(28px, 5vw, 36px)/1.35 var(--font-title);
  color: var(--color-text);
  text-transform: uppercase;
}

.lecture-section__title-main {
  display: block;
}

.lecture-section__title-desktop,
.lecture-section__title-accent {
  display: none;
}

.lecture-section__title-accent,
.lecture-section__subheading span {
  color: var(--color-red);
  font-weight: 700;
}

.lecture-section__image {
  width: 100%;
  max-width: 394px;
  aspect-ratio: 394/250;
  background: url("./img/chess-game.png") center/100% 100% no-repeat;
  border-radius: 50%;
}

.lecture-section__subheading {
  margin: 0;
  font: 400 28px/38px var(--font-title);
  color: var(--color-text);
  text-transform: uppercase;
}

.lecture-section__regular-line,
.lecture-section__accent-line {
  display: block;
}

.lecture-section__regular-line {
  color: var(--color-text);
  font-weight: 400;
}

.support-heading {
  padding-top: clamp(35px, 6vw, 64px);
  display: grid;
  gap: clamp(21px, 4vw, 48px);
}

.support-heading__image {
  width: min(calc(100% + 38px), 526px);
  margin-left: -19px;
}

.support-heading__title {
  margin: 0;
  font: 400 clamp(28px, 5vw, 36px)/1.35 var(--font-title);
  color: var(--color-text);
  text-transform: uppercase;
}

.support-heading__title-line {
  display: block;
}

.support-heading__title-accent {
  color: var(--color-red);
  font-weight: 700;
}

.support-heading__info {
  margin: 30px 0 0;
  font: 600 20px var(--font-body);
}

.support-heading__info-item {
  display: flex;
  flex-direction: column;
  padding: 10px 0;
  border-bottom: 2px solid #d0d0d0;
}

.support-heading__info-item:last-child {
  border-bottom: 0;
}

.support-heading__info-item:nth-child(4) {
  flex-direction: row;
  gap: 12px;
  align-items: center;
}

.support-heading__info dt {
  margin: 0;
  font-weight: 400;
  line-height: 37px;
  color: rgba(49, 49, 49, 0.7);
  white-space: nowrap;
}

.support-heading__info dd {
  margin: 0;
  line-height: 32px;
  color: var(--color-text);
  overflow-wrap: anywhere;
}

del {
  text-decoration: line-through;
  text-decoration-color: var(--color-red);
}

.support-heading__contact {
  margin: 24px 0 0;
  font: 400 18px/22px var(--font-body);
  color: var(--color-blue);
  overflow-wrap: break-word;
}

/* ------- stages ------- */
.stages {
  position: relative;
  padding-top: clamp(96px, 12vw, 191px);
  color: var(--color-text);
}

.stages__airplane--mobile {
  position: absolute;
  z-index: 8;
  top: 0;
  left: 0;
  width: min(92vw, 335px);
  aspect-ratio: 801 / 470;
  background: url("./img/airplane.png") center / contain no-repeat;
  transform: rotate(-4deg);
  pointer-events: none;
}

.stages__airplane {
  display: none;
}

.stages__header {
  margin-bottom: clamp(112px, 18vw, 150px);
}

.stages__header-title {
  width: min(100%, 806px);
  margin: 0;
  font: 400 clamp(36px, 7vw, 54px)/1.12 var(--font-title);
  letter-spacing: 0.02rem;
  text-transform: uppercase;
}

.stages__header-subtitle {
  margin: 14px 0 0;
  font: 400 clamp(18px, 2.5vw, 20px)/1.2 var(--font-body);
  color: var(--color-blue);
}

.stages__header-subtitle span {
  display: block;
}

.stages__viewport {
  position: relative;
  overflow: hidden;
}

.stages__list {
  display: flex;
  width: 100%;
  gap: clamp(20px, 5vw, 40px);
  transition: transform 0.35s ease;
  will-change: transform;
}

.stages__group {
  position: relative;
  z-index: 2;
  flex: 0 0 100%;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 62px 20px 24px;
  background: url("./img/cooper-union-stamp-paper.jpg") center/100% 100% no-repeat;
}

.stages__card {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.stages__num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #fff;
  font-size: 20px;
  font-weight: 600;
}

.stages__card p {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  font-size: clamp(18px, 3.8vw, 20px);
  font-weight: 500;
  line-height: 1.22;
}

.stages__nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 28px;
}

.carousel-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 36px;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  padding: 0;
  background: var(--color-text);
  cursor: pointer;
  transition: opacity 0.2s ease, background-color 0.2s ease;
}

.carousel-btn:hover {
  background: #fbce51;
}

.carousel-btn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
  background: var(--color-text) !important;
}

.carousel-btn--left {
  transform: rotate(180deg);
}

.dot-indicator {
  display: flex;
  gap: 5px;
  align-items: center;
}

.dot {
  width: 10px;
  height: 10px;
  border: 0;
  border-radius: 50%;
  padding: 0;
  background: #d9d9d9;
  cursor: pointer;
}

.dot--active {
  background: var(--color-text);
}

/* ---------- participants ---------- */
.participants {
  padding-top: clamp(120px, 12vw, 228px);
  color: var(--color-text);
}

.participants__header-title {
  width: min(100%, 806px);
  margin: 0;
  font: 400 clamp(36px, 7vw, 54px)/1.12 var(--font-title);
  text-transform: uppercase;
}

.mobile-break {
  display: inline;
}

.participants__viewport {
  overflow: hidden;
  margin-top: clamp(40px, 5vw, 60px);
}

.participants__list {
  display: flex;
  width: 100%;
  gap: clamp(20px, 3vw, 32px);
  transition: transform 0.35s ease;
  will-change: transform;
}

.participant {
  flex: 0 0 100%;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
  padding: 6px 0;
  text-align: center;
}

.participant img {
  width: clamp(244px, 58vw, 320px);
  max-width: 100%;
  height: auto;
  aspect-ratio: 1;
}

.participant h3 {
  width: 100%;
  max-width: 100%;
  margin: 28px 0 0;
  padding: 0 8px;
  overflow-wrap: break-word;
  font: 600 clamp(21px, 5vw, 24px)/1.2 var(--font-body);
  min-height: 2.4em;
  display: flex;
  align-items: center;
  justify-content: center;
}

.participant p {
  width: 100%;
  max-width: 100%;
  margin: 8px 0 0;
  padding: 0 8px;
  opacity: 0.6;
  overflow-wrap: break-word;
  font: 400 clamp(18px, 4.5vw, 20px)/1.2 var(--font-body);
  min-height: 2.4em;
  display: flex;
  align-items: center;
  justify-content: center;
}

.participant a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 113px;
  height: 35px;
  margin-top: 20px;
  border: 1px solid var(--color-blue);
  border-radius: 62px;
  color: var(--color-blue);
  font: 500 16px/19.2px var(--font-body);
}

.participants__nav {
  display: flex;
  align-items: center;
  gap: 14px;
  justify-content: center;
  margin-top: 30px;
}

.participants__nav-pages {
  display: flex;
  align-items: center;
  gap: 1px;
  font: 400 16px/18px var(--font-body);
  white-space: nowrap;
}

.participants__nav-pages span:not(.active) {
  opacity: 0.6;
}

/* ---------- footer ---------- */
.footer {
  position: relative;
  width: 100%;
  min-height: 252px;
  margin-top: 100px;
  padding: 72px max(56px, calc((100vw - 1222px) / 2)) 40px;
  background: var(--color-paper);
  overflow: hidden;
}

.footer > p {
  max-width: 1222px;
  margin: 0 auto;
  opacity: 0.6;
  font: 400 16px/19px var(--font-body);
}

/* ---------- animations ---------- */
.animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- responsive ---------- */
@media (max-width: 599px) {
  .lecture-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: clamp(24px, 4vw, 64px);
    padding-top: clamp(48px, 7vw, 109px);
    width: calc(100% - 40px);
    max-width: 394px;
    margin-left: auto;
    margin-right: auto;
  }
  .lecture-section__heading,
  .lecture-section__subheading {
    width: 100%;
    text-align: left;
  }
  .lecture-section__image {
    width: 100%;
    max-width: 394px;
  }
  .hero__headline-title {
    font-size: 30px;
    line-height: 36px;
  }
  .hero__headline-line--3 {
    width: 190px;
    margin-left: 45px;
  }
  .hero__headline-line--4 {
    width: 300px;
    margin-left: -15px;
  }
  .hero__subtitle {
    max-width: 315px;
  }
  .stages__card p {
    width: 220px;
    max-width: 220px;
  }
  .participant h3 { max-width: 300px; font-size: 21px; }
  .participant p { max-width: 300px; font-size: 18px; }
}

@media (min-width: 600px) {
  :root {
    --container: min(100% - 64px, 1222px);
  }
  .hero { height: 760px; }
  .hero__content { margin-top: 64px; }
  .hero__actions { flex-direction: row; }
  .hero__cta { flex: 1; min-height: 56px; }
  .lecture-section {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 42%);
    align-items: center;
  }
  .lecture-section__heading { grid-column: 1; }
  .lecture-section__image { grid-column: 2; grid-row: 1 / span 2; }
  .lecture-section__subheading { grid-column: 1; }
  .support-heading {
    display: grid;
    grid-template-columns: minmax(220px, 42%) minmax(0, 1fr);
    align-items: start;
  }
  .support-heading__image { width: 100%; margin-left: 0; }
  .participant {
    flex-basis: calc((100% - clamp(20px, 3vw, 32px)) / 2);
  }
}

@media (min-width: 600px) and (max-width: 1024px) {
  .support-heading {
    display: grid;
    grid-template-columns: minmax(220px, 42%) 1fr;
    gap: 28px 20px;
    align-items: start;
    padding-top: 48px;
  }
  .support-heading__block { display: contents; }
  .support-heading__image { grid-column: 1; grid-row: 1; width: 100%; margin-left: 0; }
  .support-heading__title { grid-column: 2; grid-row: 1; margin: 0; }
  .support-heading__info { grid-column: 1 / -1; grid-row: 2; margin-top: 0; }
  .support-heading__contact { grid-column: 1 / -1; grid-row: 3; margin-top: 0; font-size: 18px; line-height: 22px; }
}

@media (min-width: 768px) {
  .hero { height: 580px; }
  .hero__scene,
  .hero__foreground-figures {
    width: 1366px;
    height: 700px;
  }
  .hero__ellipse {
    top: -45px;
    left: 1003px;
    width: 660px;
    height: 660px;
  }
  .hero__chess-piece--queen {
    top: 165px;
    left: 1062px;
    width: 146px;
    height: 265px;
    rotate: 0deg;
  }
  .hero__chess-piece--king {
    top: 270px;
    left: 729px;
    width: 130px;
    height: 265px;
  }
  .hero__chess-piece--knight {
    top: 483px;
    left: 835px;
    width: 196px;
    height: 217px;
  }
  .hero__chess-piece--pawn {
    top: 558px;
    left: 1237px;
    width: 85px;
    height: 122px;
  }
  .hero__city {
    top: 0;
    left: -280px;
    width: 1920px;
    height: 700px;
  }
  .hero__logo {
    position: absolute;
    top: 26px;
    left: max(40px, calc(50% - 611px));
    width: 245px;
    height: 36px;
  }
  .hero__logo-mark { width: 91px; }
  .hero__logo-icon { top: 2px; height: 33.7px; }
  .hero__logo-icon:nth-child(2) { left: 23px; }
  .hero__logo-icon:nth-child(3) { left: 46px; }
  .hero__logo-icon:nth-child(4) { left: 69px; }
  .hero__logo-title { left: 98px; font-size: 16.7px; line-height: 18px; }
  .hero__content {
    width: min(48vw, 542px);
    margin: 0;
    top: 124px;
    left: max(40px, calc(50% - 611px));
  }
  .hero__headline-title { font-size: clamp(42px, 5.1vw, 60px); line-height: 1.1; }
  .hero__subtitle { text-align: center; }
  .desktop-break { display: inline; }
  .lecture-section__title-main,
  .lecture-section__title-desktop,
  .lecture-section__title-accent { display: inline; }
  .lecture-section__subheading { display: none; }
  .support-heading__title-line { display: inline; }
  .support-heading__info-item:nth-child(4) { gap: 16px; }
}

@media (min-width: 900px) {
  .hero { height: 620px; }
  .stages__group { min-height: 260px; padding: 48px; }
}

@media (min-width: 1100px) {
  .hero { height: 660px; }
}

@media (min-width: 1280px) {
  .hero { height: 700px; }
}

/* ---------- desktop >= 1025px ---------- */
@media (min-width: 1025px) {
  :root {
    --container: min(100% - 64px, 1222px);
  }

  .ticker--hero-inside,
  .ticker--footer-inside { display: none; }
  .ticker--top-outside,
  .ticker--bottom-outside { display: flex; }
  .ticker--bottom-outside { margin-top: 80px; }
  .ticker__track { padding: 18px 12px; }
  .ticker__text { font-size: 22px; line-height: 24.2px; }

  .hero { height: 620px; }
  .hero__content { width: 542px; }
  .hero__headline-title { font-size: 60px; line-height: 66px; }
  .hero__headline-line--3 { width: 360px; margin-left: 90px; }
  .hero__headline-line--4 { width: 542px; margin-left: 0; }
  .hero__subtitle { margin-top: 24px; line-height: 23.4px; }
  .hero__actions { gap: 16px; height: 72px; margin-top: 40px; }
  .hero__cta { min-height: 72px; border: 2px solid #1f1f1f; line-height: 20.8px; }
  .hero__cta--secondary { background: transparent; }

  .lecture-section {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 394px);
    padding-top: 109px;
    gap: clamp(32px, 5vw, 64px);
  }
  .lecture-section__image { margin-top: -28px; }

  .support-heading {
    grid-template-columns: minmax(360px, 526px) minmax(0, 704px);
    gap: clamp(24px, 4vw, 48px);
    padding-top: 64px;
  }
  .support-heading__image { width: 100%; margin: -28px 0 0 -25px; }
  .support-heading__title { margin-left: -7px; font-size: 36px; line-height: 48.6px; letter-spacing: 0.02rem; }
  .support-heading__info {
    display: grid;
    grid-template-columns: max-content 1fr;
    margin-top: 48px;
    margin-left: -16px;
  }
  .support-heading__info-item { display: contents; }
  .support-heading__info dt,
  .support-heading__info dd {
    padding: 11px 23px 11px 10px;
    border-bottom: 1px solid #d0d0d0;
    line-height: 32px;
    white-space: nowrap;
  }
  .support-heading__info dt { border-right: 1px solid #d0d0d0; }
  .support-heading__info dd { padding-left: 15px; }
  .support-heading__info-item:last-child dt,
  .support-heading__info-item:last-child dd { border-bottom: 0; }
  .support-heading__contact { margin-top: 34px; margin-left: -8px; font-size: 20px; line-height: 24px; }

  .stages { padding-top: 191px; }
  .stages__header { position: relative; margin-bottom: 52px; }
  .stages__header-title { width: 806px; font-size: 54px; line-height: 1.2; letter-spacing: 0.05rem; }
  .stages__header-subtitle {
    position: absolute;
    top: 70px;
    left: 301px;
    width: 280px;
    margin: 0;
    font-size: 20px;
  }

  .participants {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    column-gap: 24px;
    align-items: center;
    padding-top: 228px;
  }
  .participants__header-title {
    grid-column: 1;
    grid-row: 1;
    font-size: 54px;
    line-height: 64.8px;
    letter-spacing: 0.02rem;
  }
  .mobile-break { display: none; }
  .participants__nav { grid-column: 2; grid-row: 1; justify-self: end; margin-top: 0; }
  .participants__viewport { grid-column: 1 / -1; grid-row: 2; margin-top: 60px; }
  .participants__list { gap: 20px; }
  .participant { flex-basis: calc((100% - 40px) / 3); }
  .participant img { width: 320px; height: 320px; }
  .carousel-btn { flex-basis: 44px; width: 44px; height: 44px; }
  .footer { min-height: 150px; margin-top: 0; padding: 40px max(72px, calc((100vw - 1222px) / 2)) 40px; }
}

/* tablet: 1025-1199px */
@media (min-width: 1025px) and (max-width: 1199px) {
  .stages__header {
    position: static;
    margin-bottom: clamp(112px, 14vw, 150px);
  }
  .stages__header-title {
    width: min(100%, 806px);
    font-size: clamp(48px, 5vw, 54px);
  }
  .stages__header-subtitle {
    position: static;
    width: auto;
    margin-top: 14px;
  }
  .stages__viewport { overflow: hidden; }
  .stages__airplane--mobile { display: block; }
  .stages__airplane { display: none; }
  .stages__list {
    display: flex;
    grid-template-columns: none;
    gap: 40px;
    transform: none;
  }
  .stages__group {
    flex: 0 0 100%;
    max-width: 100%;
    display: flex;
    flex-direction: column;
    gap: 28px;
    padding: 62px 48px 32px;
    background: url("./img/cooper-union-stamp-paper.jpg") center/100% 100% no-repeat;
  }
  .stages__card {
    min-height: 0;
    padding: 0;
    background: none;
  }
  .stages__nav { display: flex; }
}

/* large desktop ≥1200px */
@media (min-width: 1200px) {
  .stages__airplane--mobile { display: none; }
  .stages__airplane {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(16%, -70%);
    width: min(34vw, 400px);
    aspect-ratio: 801/470;
    background: url("./img/airplane.png") center / contain no-repeat;
    pointer-events: none;
  }
  .stages__airplane:after {
    content: url("./img/airplane.svg");
    position: absolute;
    left: 12px;
    top: -27px;
    width: 100%;
    height: 100%;
    pointer-events: none;
  }
  .stages__group {
    height: auto;
    min-height: auto;
    padding: 0;
    gap: 20px;
    background: none;
    flex-direction: column;
  }
  .stages__viewport { overflow: visible; }
  .stages__list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    transform: none !important;
  }
  .stages__group--row-1 { grid-column: 1 / 3; grid-row: 1; flex-direction: row; }
  .stages__group--col-3-row-2 { grid-column: 3; grid-row: 1 / 3; }
  .stages__group--row-2 { grid-column: 1 / 3; grid-row: 2; flex-direction: row; }
  .stages__group--row-3-col-1 { grid-column: 1; grid-row: 3; }
  .stages__group--row-3-col-2-span-2 { grid-column: 2 / 4; grid-row: 3; }
  .stages__card {
    flex: 1 1 0;
    min-height: 112px;
    padding: 20px;
    background: url("./img/cooper-union-stamp-paper.jpg") center/100% 100% no-repeat;
  }
  .stages__group--col-3-row-2 .stages__card { min-height: 244px; }
  .stages__group--row-3-col-1 .stages__card,
  .stages__group--row-3-col-2-span-2 .stages__card { min-height: 136px; }
  .stages__card p { font-size: 20px; line-height: 24px; }

  .stages__header-subtitle span {
    display: inline;
  }

  .stages__nav {
    display: none !important;
  }
}

/* desktop until 1279px */
@media (min-width: 1025px) and (max-width: 1279px) {
  .support-heading__info {
    display: block;
    margin-left: 0;
  }
  .support-heading__info-item {
    display: flex;
    flex-direction: column;
    padding: 10px 0;
    border-bottom: 2px solid #d0d0d0;
  }
  .support-heading__info-item:last-child { border-bottom: 0; }
  .support-heading__info dt,
  .support-heading__info dd {
    padding: 0;
    border: 0;
    line-height: 32px;
    white-space: normal;
  }
  .support-heading__info dt { line-height: 37px; border-right: 0; }
}

@media (min-width: 1280px) {
  .hero { height: 700px; }
  :root { --container: 1222px; }
  .lecture-section { grid-template-columns: 764px 394px; gap: 64px; }
  .support-heading { grid-template-columns: 526px 704px; gap: 0; }
  .support-heading__image { width: 526px; }
}