.f1 {
  height: 620vh;
  color: var(--paper);
  --p: 0;
  background: #101013;
  border-top: 1px solid #2a2a2e;
  position: relative;
}
.f1 .mute {
  color: #9a9aa0;
}
.f1-stage {
  height: 100svh;
  padding: 92px var(--pad) 32px;
  grid-template-columns: minmax(280px, 34%) 1fr;
  gap: clamp(24px, 4vw, 64px);
  display: grid;
  position: sticky;
  top: 0;
  overflow: hidden;
}
.f1-copy {
  z-index: 2;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
  min-height: 0;
  display: flex;
}
.f1-title {
  margin-top: 14px;
}
.f1-steps {
  flex-direction: column;
  list-style: none;
  display: flex;
}
.f1-steps li {
  opacity: 0.35;
  border-top: 1px solid #2a2a2e;
  gap: 16px;
  padding: 10px 0;
  transition:
    opacity 0.6s,
    transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1);
  display: flex;
}
.f1-steps li > div {
  min-width: 0;
}
.f1-steps li.on {
  opacity: 0.6;
}
.f1-steps li.cur {
  opacity: 1;
  transform: translate(6px);
}
.f1-steps li.cur > .mono,
.f1-steps li.cur .f1-k {
  color: var(--sig2);
}
.f1-k {
  margin-bottom: 2px;
}
.f1-t {
  font-weight: 500;
  line-height: 1.3;
}
.f1-dw {
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.6s cubic-bezier(0.2, 0.7, 0.2, 1);
  display: grid;
}
.f1-dw > .f1-d {
  min-height: 0;
  overflow: hidden;
}
.f1-steps li.cur .f1-dw {
  grid-template-rows: 1fr;
}
.f1-d {
  padding-top: 6px;
  font-size: 14px;
  line-height: 1.5;
}
.f1-bar {
  background: #2a2a2e;
  height: 2px;
  margin-bottom: 14px;
}
.f1-bar i {
  background: var(--sig);
  transform-origin: 0;
  height: 100%;
  transform: scaleX(var(--p));
  display: block;
}
.f1-cta {
  margin-bottom: 10px;
}
.f1-field {
  grid-template-rows: auto auto;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-content: center;
  gap: clamp(14px, 2vw, 24px);
  min-height: 0;
  display: grid;
  position: relative;
}
.f1-field > * {
  transition:
    opacity 0.7s cubic-bezier(0.2, 0.7, 0.2, 1),
    transform 0.8s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.f1-wires {
  display: none;
}
.f1-card {
  opacity: 0.12;
  overflow-wrap: anywhere;
  background: #18181c;
  border: 1px solid #2e2e34;
  border-radius: 10px;
  min-width: 0;
  padding: 14px 16px;
  font-size: 14px;
  position: relative;
  transform: translateY(16px);
  box-shadow: 0 20px 50px -20px #0009;
}
.f1-card.on,
.f1-chunks.on .f1-card {
  opacity: 1;
  transform: none;
}
.f1-ch {
  color: var(--sig2);
  margin-bottom: 8px;
}
.f1-photo {
  filter: saturate(0.8) contrast(0.95);
  grid-area: 1/1;
  place-self: center;
  width: min(100%, 300px, 36svh - 79.2px);
  transform: rotate(-4deg) scale(1.02);
}
.f1-photo.flat {
  filter: none;
  transform: none;
}
.f1-paper {
  aspect-ratio: 3/4;
  color: #2a2620;
  background: linear-gradient(160deg, #f3efe4, #e2dccb 70%, #cfc7b2);
  border-radius: 3px;
  padding: 9%;
  font-family: Georgia, serif;
  font-size: clamp(8px, 0.8vw, 12px);
  line-height: 1.45;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 60px -20px #000000b3;
}
.f1-run {
  font: 500 0.78em var(--mono);
  letter-spacing: 0.06em;
  opacity: 0.6;
  border-bottom: 1px solid #0002;
  justify-content: space-between;
  padding-bottom: 4px;
  display: flex;
}
.f1-sec {
  margin: 8% 0 3%;
  font-weight: 700;
}
.f1-tx {
  filter: blur(0.25px);
}
.f1-fig {
  width: 70%;
  margin: 6% 0 0;
}
.f1-fig svg {
  width: 100%;
}
.f1-fig path {
  fill: none;
  stroke: #2a2620;
  stroke-width: 1.4px;
}
.f1-fig .ax {
  stroke-width: 0.8px;
}
.f1-fig circle {
  fill: #2a2620;
}
.f1-fig span {
  font-size: 0.8em;
  font-style: italic;
}
.f1-hand {
  color: #2342b8;
  font:
    italic 1.15em Comic Sans MS,
    Segoe Print,
    cursive;
  position: absolute;
  bottom: 9%;
  right: 6%;
  transform: rotate(-8deg);
}
.f1-ring {
  aspect-ratio: 1;
  border: 6px solid #8a5a2a33;
  border-radius: 50%;
  width: 46%;
  position: absolute;
  top: 28%;
  right: -10%;
  box-shadow: inset 0 0 0 2px #8a5a2a22;
}
.f1-crop {
  border: 1.5px solid var(--sig);
  opacity: 0;
  background: #2f5bff10;
  transition:
    opacity 0.5s,
    transform 0.6s cubic-bezier(0.2, 0.7, 0.2, 1);
  position: absolute;
  transform: scale(1.04);
}
.f1-crop i {
  background: var(--sig);
  color: #fff;
  font: 500 8px/1.3 var(--mono);
  white-space: nowrap;
  text-transform: uppercase;
  text-overflow: ellipsis;
  max-width: 100%;
  padding: 1px 4px;
  font-style: normal;
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
}
.f1-crop.on {
  opacity: 1;
  transform: none;
}
.f1-crop.c0 {
  background: #c2410c14;
  border-style: dashed;
  border-color: #c2410c;
  width: 88%;
  height: 7%;
  top: 5%;
  left: 6%;
}
.f1-crop.c0 i {
  background: #c2410c;
  left: auto;
  right: 0;
}
.f1-crop.c1 {
  width: 88%;
  height: 24%;
  transition-delay: 0.1s;
  top: 18%;
  left: 6%;
}
.f1-crop.c2 {
  width: 66%;
  height: 30%;
  transition-delay: 0.2s;
  top: 47%;
  left: 6%;
}
.f1-crop.c3 {
  width: 44%;
  height: 15%;
  transition-delay: 0.3s;
  top: 80%;
  left: 52%;
}
.f1-crop.c3 i {
  top: auto;
  bottom: 0;
}
.f1-parsed {
  flex-direction: column;
  grid-area: 1/2;
  align-self: center;
  gap: 3px;
  display: flex;
}
.f1-parsed code {
  font: 12px/1.5 var(--mono);
  color: #d8d8dc;
}
.f1-parsed b {
  color: var(--sig2);
  font-weight: 500;
}
.f1-img {
  border-left: 2px solid var(--sig);
  margin-top: 4px;
  padding-left: 8px;
}
.f1-strike {
  opacity: 0.4;
  text-decoration: line-through;
}
.f1-chunks {
  opacity: 1;
  flex-direction: column;
  grid-area: 2/2;
  gap: 8px;
  display: flex;
}
.f1-chunk {
  width: 88%;
  padding: 10px 12px;
  font-size: 13px;
}
.f1-chunk p:nth-child(2) {
  margin: 4px 0;
}
.f1-chunk:first-child {
  transition-delay: 0s;
}
.f1-chunk:nth-child(2) {
  margin-left: 6%;
  transition-delay: 0.12s;
}
.f1-chunk:nth-child(3) {
  margin-left: 12%;
  transition-delay: 0.24s;
}
.f1-chunk .mono:first-child {
  color: var(--sig2);
}
.f1-space {
  grid-area: 2/1;
  align-self: start;
}
.f1-space svg {
  width: 100%;
  max-height: 16vh;
  display: block;
}
.f1-space .pt {
  fill: #6b6b75;
}
.f1-space .hit {
  fill: var(--sig2);
}
.f1-space .q {
  fill: #fff;
}
.f1-space .ring {
  fill: none;
  stroke: var(--sig);
  stroke-dasharray: 3 3;
  opacity: 0;
  transition: opacity 0.6s 0.3s;
}
.f1[data-s="5"] .f1-space .ring {
  opacity: 1;
}
.f1-space text {
  fill: #fff;
  font: 9px var(--mono);
}
.f1-vec {
  margin-top: 6px;
  font-size: 10px;
}
.f1-answer {
  flex-direction: column;
  grid-area: 3/1 / auto/-1;
  gap: 8px;
  display: flex;
}
.f1-answer .mono {
  margin-bottom: 2px;
  font-size: 10px;
  display: block;
}
.f1-q {
  color: #c8c8cc;
}
.f1-a {
  border-left: 2px solid var(--sig);
  padding-left: 10px;
}
.f1-src {
  flex-wrap: wrap;
  gap: 8px;
  display: flex;
}
.f1-src span {
  border: 1px solid var(--sig);
  color: var(--sig2);
  border-radius: 99px;
  padding: 3px 7px;
  font-size: 10px;
}
.f1-field {
  grid-template-rows: auto auto auto;
}
@media (width>=901px) and (height<=820px) {
  .f1-stage {
    padding-top: 80px;
    padding-bottom: 20px;
  }
  .f1-card {
    padding: 10px 12px;
    font-size: 13px;
  }
  .f1-parsed code {
    font-size: 11px;
  }
  .f1-chunk {
    padding: 7px 10px;
    font-size: 12px;
  }
  .f1-space svg {
    max-height: 11vh;
  }
  .f1-steps li {
    padding: 7px 0;
  }
}
@media (width<=900px) {
  .f1 {
    height: 680vh;
  }
  .f1-stage {
    padding: 76px var(--pad) 14px;
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .f1-copy {
    display: contents;
  }
  .f1-copy > div:first-child {
    grid-area: 1/1;
  }
  .f1-steps {
    grid-column: 1;
  }
  .f1-title {
    margin-top: 6px;
    font-size: 24px;
  }
  .f1-steps li {
    border: 0;
    padding: 4px 0;
    display: none;
  }
  .f1-steps li.cur {
    display: flex;
    transform: none;
  }
  .f1-steps li.cur .f1-d {
    font-size: 13px;
  }
  .f1-copy .fine {
    display: none;
  }
  .f1-copy > div:last-child {
    grid-area: 3/1;
  }
  .f1-field {
    grid-row: 2;
    grid-template-rows: minmax(0, 1fr);
    grid-template-columns: minmax(0, 1fr);
    align-content: stretch;
    place-items: center;
  }
  .f1-field > * {
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    grid-area: 1/1 !important;
  }
  .f1-field > .now {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .f1-photo {
    width: min(64vw, 75svh - 300px, 260px);
  }
  .f1-photo.now:not(.flat) {
    transform: rotate(-4deg);
  }
  .f1-card,
  .f1-chunks {
    width: 100%;
    max-width: 420px;
  }
  .f1-chunks .f1-card {
    opacity: 1;
    transform: none;
  }
  .f1-parsed code {
    font-size: 11px;
  }
  .f1-chunk {
    padding: 8px 10px;
    font-size: 12px;
  }
  .f1-stage {
    grid-template-rows: auto auto minmax(0, 1fr) auto;
  }
  .f1-steps {
    grid-row: 2;
    margin-top: 0;
  }
  .f1-field {
    grid-row: 3;
  }
  .f1-copy > div:last-child {
    grid-row: 4;
  }
}
.f1-rm {
  height: auto;
}
.f1-rm .f1-stage {
  height: auto;
  padding: 96px var(--pad) 72px;
  display: block;
  position: relative;
  overflow: visible;
}
.f1-rm .f1-copy {
  display: flex;
}
.f1-rm .f1-steps {
  margin: 28px 0;
}
.f1-rm .f1-steps li {
  opacity: 1;
  display: flex;
  transform: none;
}
.f1-rm .f1-dw {
  grid-template-rows: 1fr;
}
.f1-rm .f1-copy .fine {
  display: block;
}
.f1-rm .f1-bar {
  display: none;
}
.f1-rm .f1-field {
  grid-template-rows: none;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 40px;
  display: grid;
}
.f1-rm .f1-field > *,
.f1-rm .f1-card,
.f1-rm .f1-chunk {
  opacity: 1;
  visibility: visible;
  width: auto;
  max-width: none;
  margin-left: 0;
  transition: none;
  transform: none;
  grid-area: auto !important;
}
.f1-rm .f1-photo {
  width: min(100%, 300px);
}
.f1-rm .f1-crop {
  transition: none;
}
@media (prefers-reduced-motion: reduce) {
  .f1 * {
    transition: none !important;
  }
}