/* Shared event archive layout. Page-specific class names keep each archive independent. */
:is(.iyc-archive, .tedx-archive) {
  position: relative;
  padding: 84px 0 96px;
  overflow: hidden;
  background: linear-gradient(180deg, #f7fbfe 0%, #fff 100%);
}

:is(.iyc-archive, .tedx-archive)::before {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  top: 8%;
  right: -250px;
  border: 52px solid rgba(56, 166, 221, .1);
  border-radius: 50%;
}

:is(.iyc-archive__section-head, .tedx-archive__section-head) {
  margin-bottom: 38px;
}

:is(.iyc-archive__section-title, .tedx-archive__section-title) {
  margin: 0;
}

:is(.iyc-archive__chapter-list, .tedx-archive__chapter-list) {
  display: grid;
  gap: 28px;
}

:is(.iyc-archive__chapter, .tedx-archive__chapter) {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  grid-template-areas: "head mosaic" "copy mosaic";
  column-gap: 32px;
  row-gap: 14px;
  padding: 28px;
  overflow: hidden;
  background: rgba(255, 255, 255, .94);
  border: 1px solid rgba(8, 38, 82, .12);
  border-radius: 24px;
  box-shadow: 0 18px 42px rgba(8, 38, 82, .07);
}

:is(.iyc-archive__chapter--reverse, .tedx-archive__chapter--reverse) {
  grid-template-areas: "mosaic head" "mosaic copy";
}

:is(.iyc-archive__chapter-head, .tedx-archive__chapter-head) {
  grid-area: head;
  align-self: end;
}

:is(.iyc-archive__year-note, .tedx-archive__year-note) {
  display: block;
  margin-bottom: 12px;
  color: #38a6dd;
  font-family: var(--montserrat, "Montserrat", sans-serif);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

:is(.iyc-archive__chapter-card, .tedx-archive__chapter-card) {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 22px;
  color: #fff;
  background: linear-gradient(135deg, #082652, #176da7);
  border-radius: 16px;
}

:is(.iyc-archive__chapter-year, .tedx-archive__chapter-year) {
  margin: 0;
  color: #fff;
  font-family: var(--montserrat, "Montserrat", sans-serif);
  font-size: clamp(1.35rem, 2.4vw, 2.2rem);
  font-weight: 600;
  line-height: 1;
}

:is(.iyc-archive__chapter-index, .tedx-archive__chapter-index) {
  display: grid;
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  place-items: center;
  color: #082652;
  background: #fff;
  border-radius: 50%;
  font-family: var(--montserrat, "Montserrat", sans-serif);
  font-size: .78rem;
  font-weight: 800;
}

:is(.iyc-archive__year-copy, .tedx-archive__year-copy) {
  grid-area: copy;
  margin: 0;
  max-width: 440px;
  color: #58708d;
  font-family: "Poppins", sans-serif;
  line-height: 1.75;
}

:is(.iyc-archive__mosaic, .tedx-archive__mosaic) {
  grid-area: mosaic;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 150px);
  gap: 10px;
  min-height: 310px;
}

:is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item) {
  margin: 0;
  overflow: hidden;
  border-radius: 12px;
  background: #dff4fc;
}

:is(.iyc-archive__mosaic-item--wide, .tedx-archive__mosaic-item--wide) {
  grid-column: span 2;
}

:is(.iyc-archive__mosaic-item--tall, .tedx-archive__mosaic-item--tall) {
  grid-row: span 2;
}

:is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item) img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .45s ease;
}

:is(.iyc-archive__chapter, .tedx-archive__chapter):hover :is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item) img {
  transform: scale(1.05);
}

@media (max-width: 850px) {
  :is(.iyc-archive, .tedx-archive) {
    padding: 70px 0;
  }

  :is(.iyc-archive__chapter, .tedx-archive__chapter),
  :is(.iyc-archive__chapter--reverse, .tedx-archive__chapter--reverse) {
    grid-template-columns: 1fr;
    grid-template-areas: "head" "copy" "mosaic";
  }
}

@media (max-width: 560px) {
  :is(.iyc-archive, .tedx-archive) {
    padding: 58px 0;
  }

  :is(.iyc-archive__chapter, .tedx-archive__chapter) {
    padding: 18px;
    border-radius: 18px;
  }

  :is(.iyc-archive__mosaic, .tedx-archive__mosaic) {
    grid-template-rows: repeat(2, 105px);
    gap: 7px;
    min-height: 217px;
  }

  :is(.iyc-archive__chapter-card, .tedx-archive__chapter-card) {
    padding: 17px;
  }
}

/* Exact PYP archive treatment, scoped to the renamed event archive classes. */
:is(.iyc-archive, .tedx-archive) {
  padding: 100px 0 72px;
  background: transparent;
}

:is(.iyc-archive, .tedx-archive)::before {
  display: none;
}

:is(.iyc-archive__chapter-list, .tedx-archive__chapter-list) {
  gap: 28px;
  counter-reset: archive-index;
}

:is(.iyc-archive__chapter, .tedx-archive__chapter) {
  position: relative;
  counter-increment: archive-index;
  grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr);
  grid-template-areas: "head mosaic" "copy mosaic";
  column-gap: 32px;
  row-gap: 14px;
  align-items: start;
  padding: 28px;
  border: 1px solid rgba(24, 58, 94, .08);
  border-radius: 34px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .92), rgba(247, 251, 255, .88)), rgba(255, 255, 255, .72);
  box-shadow: 0 22px 52px rgba(8, 38, 82, .08), inset 0 1px 0 rgba(255, 255, 255, .8);
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .8s ease, transform .8s cubic-bezier(.22, 1, .36, 1), box-shadow .35s ease;
}

:is(.iyc-archive__chapter, .tedx-archive__chapter).is-visible {
  opacity: 1;
  transform: translateY(0);
}

:is(.iyc-archive__chapter, .tedx-archive__chapter)::before {
  content: attr(data-year);
  position: absolute;
  z-index: 0;
  left: -.02em;
  top: -.08em;
  color: rgba(24, 58, 94, .03);
  font-family: var(--playfair, "Playfair Display", serif);
  font-size: clamp(4.5rem, 8vw, 7.9rem);
  font-style: italic;
  font-weight: 700;
  line-height: 1;
  pointer-events: none;
  white-space: nowrap;
}

:is(.iyc-archive__chapter--reverse, .tedx-archive__chapter--reverse) {
  grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
  grid-template-areas: "mosaic head" "mosaic copy";
}

:is(.iyc-archive__chapter--reverse, .tedx-archive__chapter--reverse)::before {
  right: -.04em;
  left: auto;
}

:is(.iyc-archive__chapter-head, .tedx-archive__chapter-head) {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 540px;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.22, 1, .36, 1);
}

:is(.iyc-archive__chapter-card, .tedx-archive__chapter-card) {
  position: relative;
  width: 85%;
  min-height: 100px;
  padding: 18px 18px 18px 22px;
  border: 1px solid rgba(176, 205, 240, .9);
  border-radius: 30px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .995), rgba(244, 248, 255, .98));
  box-shadow: 0 10px 24px rgba(8, 38, 82, .08), inset 0 1px 0 rgba(255, 255, 255, .9);
  overflow: hidden;
}

:is(.iyc-archive__chapter-card, .tedx-archive__chapter-card)::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -22px;
  width: 132px;
  height: 132px;
  border-radius: 50%;
  background: linear-gradient(180deg, #3c8ce2, #1f67ce);
  box-shadow: inset 0 8px 14px rgba(255, 255, 255, .16), 0 10px 18px rgba(31, 103, 206, .16);
  transform: translateY(-50%);
  animation: eventArchivePulse 7s ease-in-out infinite;
}

:is(.iyc-archive__chapter-year, .tedx-archive__chapter-year) {
  position: relative;
  z-index: 1;
  color: var(--dark-blue, #00285e);
  font-family: var(--montserrat, "Montserrat", sans-serif);
  font-size: 52px;
  font-weight: 700;
  letter-spacing: -.09em;
  line-height: .9;
}

:is(.iyc-archive__chapter-index, .tedx-archive__chapter-index) {
  position: relative;
  z-index: 1;
  min-width: 58px;
  min-height: 58px;
  padding: 0 12px 0 16px;
  color: #fff;
  background: rgba(255, 255, 255, .08);
  font-size: .88rem;
  letter-spacing: .16em;
}

:is(.iyc-archive__year-note, .tedx-archive__year-note) {
  order: -1;
  font-size: .84rem;
  letter-spacing: .24em;
}

:is(.iyc-archive__year-note, .tedx-archive__year-note)::before {
  content: "";
  width: 24px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}

:is(.iyc-archive__year-copy, .tedx-archive__year-copy) {
  position: relative;
  z-index: 2;
  max-width: 460px;
  font-family: var(--montserrat_alternates, "Montserrat Alternates", sans-serif);
  font-size: 1.08rem;
  line-height: 1.9;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s ease, transform .7s cubic-bezier(.22, 1, .36, 1);
}

:is(.iyc-archive__mosaic, .tedx-archive__mosaic) {
  grid-template-rows: unset;
  min-height: 0;
  padding: 4px;
  border-radius: 28px;
  gap: 14px;
}

:is(.iyc-archive__mosaic-item--wide, .tedx-archive__mosaic-item--wide),
:is(.iyc-archive__mosaic-item--tall, .tedx-archive__mosaic-item--tall) {
  grid-column: auto;
  grid-row: auto;
}

:is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item) {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  border: 1px solid rgba(24, 58, 94, .08);
  border-radius: 22px;
  box-shadow: 0 14px 28px rgba(8, 38, 82, .1);
  cursor: zoom-in;
  opacity: 0;
  transform: translateY(18px) translateZ(0);
  transition: opacity .7s ease, transform .35s ease, box-shadow .35s ease, border-color .35s ease;
}

:is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item):hover {
  transform: scale(1.02) translateZ(0);
  box-shadow: 0 18px 34px rgba(8, 38, 82, .14);
  border-color: rgba(24, 58, 94, .14);
  z-index: 6;
}

:is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item) img {
  filter: saturate(.95) brightness(1);
}

:is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item):hover img {
  filter: saturate(1) brightness(1);
  transform: scale(1.03);
}

:is(.iyc-archive__chapter, .tedx-archive__chapter).is-visible :is(.iyc-archive__chapter-head, .tedx-archive__chapter-head),
:is(.iyc-archive__chapter, .tedx-archive__chapter).is-visible :is(.iyc-archive__year-copy, .tedx-archive__year-copy),
:is(.iyc-archive__chapter, .tedx-archive__chapter).is-visible :is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item) {
  opacity: 1;
  transform: translateY(0);
}

:is(.iyc-archive__chapter, .tedx-archive__chapter).is-visible :is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item):nth-child(2) {
  transition-delay: .2s;
}

:is(.iyc-archive__chapter, .tedx-archive__chapter).is-visible :is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item):nth-child(3) {
  transition-delay: .26s;
}

:is(.iyc-archive__chapter, .tedx-archive__chapter).is-visible :is(.iyc-archive__mosaic-item, .tedx-archive__mosaic-item):nth-child(4) {
  transition-delay: .32s;
}

:is(.iyc-archive__chapter, .tedx-archive__chapter):hover {
  transform: translateY(-3px);
  box-shadow: 0 26px 62px rgba(8, 38, 82, .12), inset 0 1px 0 rgba(255, 255, 255, .8);
}

@keyframes eventArchivePulse {

  0%,
  100% {
    transform: translateY(-50%) scale(1);
  }

  50% {
    transform: translateY(-50%) scale(1.03);
  }
}

.event-archive-gallery-modal .modal-dialog {
  width: min(1180px, calc(100vw - 28px));
  max-width: 1180px;
}

.event-archive-gallery-modal .modal-content {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 34px;
  background: linear-gradient(135deg, rgba(6, 18, 40, .98), rgba(10, 35, 75, .98)), #08152d;
  color: #fff;
  box-shadow: 0 34px 90px rgba(2, 10, 26, .5);
}

.event-archive-gallery-modal .modal-content::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 12% 18%, rgba(56, 166, 221, .24), transparent 28%), radial-gradient(circle at 88% 82%, rgba(255, 255, 255, .12), transparent 24%);
  pointer-events: none;
}

.event-archive-gallery-modal__close {
  position: absolute;
  z-index: 4;
  top: 18px;
  right: 18px;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  background: #fff;
  color: #081a3a;
  font-size: 1.7rem;
  line-height: 1;
}

.event-archive-gallery-modal__shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(240px, .78fr) minmax(0, 1.22fr);
  gap: 24px;
  padding: 28px;
  align-items: center;
}

.event-archive-gallery-modal__meta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 10px 8px 10px 2px;
}

.event-archive-gallery-modal__eyebrow,
.event-archive-gallery-modal__count {
  color: rgba(143, 211, 255, .88);
  font-family: var(--montserrat, "Montserrat", sans-serif);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .24em;
}

/* The final metadata line carries the talk title, not a numerical slide count. */
.event-archive-gallery-modal__count {
  max-width: 330px;
  letter-spacing: .06em;
  line-height: 1.5;
}

.event-archive-gallery-modal__title {
  margin: 0;
  color: #fff;
  font-family: var(--montserrat, "Montserrat", sans-serif);
  font-size: clamp(2rem, 3.7vw, 4.2rem);
  font-weight: 900;
  letter-spacing: -.07em;
  line-height: .95;
}

.event-archive-gallery-modal__subhead {
  margin: 0;
  color: rgba(255, 255, 255, .76);
  font-family: var(--montserrat_alternates, "Montserrat Alternates", sans-serif);
  line-height: 1.8;
}

.event-archive-gallery-modal__viewer {
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 30px;
  background: rgba(255, 255, 255, .06);
}

.event-archive-gallery-modal .carousel,
.event-archive-gallery-modal .carousel-inner {
  overflow: hidden;
  border-radius: 24px;
}

.event-archive-gallery-modal .carousel-item {
  aspect-ratio: 16 / 10;
  background: rgba(255, 255, 255, .06);
}

.event-archive-gallery-modal .carousel-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.event-archive-gallery-modal .carousel-control-prev,
.event-archive-gallery-modal .carousel-control-next {
  width: 56px;
  height: 56px;
  top: 50%;
  border: 1px solid rgba(0, 40, 94, .08);
  border-radius: 50%;
  background: rgba(255, 255, 255, .92);
  color: var(--dark-blue, #00285e);
  opacity: 1;
  transform: translateY(-50%);
}

@media (max-width: 850px) {

  :is(.iyc-archive__chapter, .tedx-archive__chapter),
  :is(.iyc-archive__chapter--reverse, .tedx-archive__chapter--reverse) {
    grid-template-columns: 1fr;
    grid-template-areas: "head" "copy" "mosaic";
  }

  .event-archive-gallery-modal__shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 767px) {

  :is(.iyc-archive__chapter, .tedx-archive__chapter),
  :is(.iyc-archive__chapter--reverse, .tedx-archive__chapter--reverse) {
    row-gap: 12px;
    padding: 20px;
  }

  :is(.iyc-archive__chapter, .tedx-archive__chapter)::before,
  :is(.iyc-archive__chapter--reverse, .tedx-archive__chapter--reverse)::before {
    font-size: 2.6rem;
  }

  :is(.iyc-archive__chapter-year, .tedx-archive__chapter-year) {
    font-size: clamp(2.2rem, 9vw, 3.4rem);
  }

  :is(.iyc-archive__year-note, .tedx-archive__year-note) {
    font-size: .76rem;
  }

  :is(.iyc-archive__year-copy, .tedx-archive__year-copy) {
    max-width: 100%;
    font-size: 1.05rem;
  }

  :is(.iyc-archive__mosaic, .tedx-archive__mosaic) {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    padding: 0;
  }

  :is(.iyc-archive__chapter-card, .tedx-archive__chapter-card) {
    min-height: 104px;
    padding: 16px 16px 16px 20px;
    border-radius: 24px;
  }

  :is(.iyc-archive__chapter-card, .tedx-archive__chapter-card)::after {
    right: -18px;
    width: 118px;
    height: 118px;
  }

  :is(.iyc-archive__chapter-index, .tedx-archive__chapter-index) {
    min-width: 52px;
    min-height: 52px;
    font-size: .8rem;
  }

  .event-archive-gallery-modal .modal-dialog {
    width: calc(100vw - 16px);
  }

  .event-archive-gallery-modal__shell {
    gap: 18px;
    padding: 20px;
  }

  .event-archive-gallery-modal__meta {
    gap: 12px;
    padding: 0;
  }

  .event-archive-gallery-modal__viewer {
    padding: 8px;
    border-radius: 22px;
  }

  .event-archive-gallery-modal .carousel-item {
    aspect-ratio: 4 / 5;
  }

  .event-archive-gallery-modal .carousel-control-prev,
  .event-archive-gallery-modal .carousel-control-next {
    width: 44px;
    height: 44px;
  }
}