.concept-start--corridor {
  align-items: center;
  display: grid;
  gap: clamp(32px, 5vw, 76px);
  grid-template-columns: minmax(250px, .64fr) minmax(0, 1.36fr);
}

.concept-start--corridor > .section-heading {
  display: block;
  margin: 0;
}

.concept-start--corridor > .section-heading > div,
.concept-start--corridor > .section-heading > p {
  max-width: 420px;
}

.concept-start--corridor > .section-heading h2 {
  font-size: clamp(3rem, 5.7vw, 6.2rem);
  letter-spacing: -.065em;
  line-height: .88;
  margin-top: 18px;
  text-wrap: balance;
}

.concept-start--corridor > .section-heading > p {
  line-height: 1.55;
  margin-top: 24px;
}

.begin-four-corridor {
  margin: 0;
  max-width: none;
  min-width: 0;
  perspective: 1500px;
  width: 100%;
}

.begin-four-corridor.is-ready {
  display: block;
}

.begin-four-corridor__instrument {
  aspect-ratio: 1.58;
  outline: none;
  perspective: 1400px;
  position: relative;
  user-select: none;
  width: 100%;
}

.begin-four-corridor__space {
  inset: 4%;
  position: absolute;
  transform-style: preserve-3d;
}

.begin-four-corridor__wall,
.begin-four-corridor__room,
.begin-four-corridor__gates {
  aspect-ratio: 1.58;
  left: 50%;
  max-width: 760px;
  position: absolute;
  top: 50%;
  transform-style: preserve-3d;
  translate: -50% -50%;
  width: min(96%, 760px);
}

.begin-four-corridor__wall {
  background: rgba(2, 9, 13, .88);
  box-shadow: 0 28px 66px rgba(0, 0, 0, .38);
  isolation: isolate;
  overflow: hidden;
  transform: translateZ(155px) rotateX(var(--begin-four-tilt-x, 1deg)) rotateY(var(--begin-four-tilt-y, -1deg));
  transition: transform .76s cubic-bezier(.2, .8, .18, 1), opacity .45s ease, filter .45s ease;
  z-index: 5;
}

.begin-four-corridor__grid {
  background: rgba(var(--accent-green-rgb), .24);
  border: 1px solid rgba(var(--accent-green-rgb), .58);
  box-sizing: border-box;
  display: grid;
  gap: 2px;
  grid-template-columns: repeat(2, 1fr);
  height: 100%;
  position: relative;
  z-index: 1;
}

.begin-four-corridor__card {
  background: #061117;
  border: 0 !important;
  color: #f2faf7;
  cursor: pointer;
  display: block !important;
  min-width: 0;
  outline: 0;
  overflow: hidden;
  position: relative;
  text-align: left;
  transform-style: preserve-3d;
  transition: transform .62s cubic-bezier(.2, .8, .18, 1), opacity .38s ease, filter .38s ease;
  will-change: transform, opacity, filter;
  z-index: 1;
}

.begin-four-corridor__card::after {
  background: linear-gradient(180deg, rgba(2, 8, 13, .02) 28%, rgba(2, 8, 13, .16) 56%, rgba(2, 8, 13, .96));
  box-shadow: inset 0 0 0 1px rgba(var(--accent-green-rgb), .58), inset 0 0 38px transparent;
  content: "";
  inset: 0;
  pointer-events: none;
  position: absolute;
  transition: box-shadow .3s;
  z-index: 1;
}

.begin-four-corridor__card:hover,
.begin-four-corridor__card:focus-visible {
  transform: translateZ(18px);
  z-index: 3;
}

.begin-four-corridor__card:hover::after,
.begin-four-corridor__card:focus-visible::after,
.begin-four-corridor__card.is-selected::after {
  box-shadow: inset 0 0 0 1px rgb(var(--accent-green-rgb)), inset 0 0 40px rgba(var(--accent-green-rgb), .14);
}

.concept-start__grid .begin-four-corridor__card > img {
  height: 100%;
  inset: 0;
  object-fit: cover;
  position: absolute;
  transform: none;
  width: 100%;
}

.concept-start__grid .begin-four-corridor__card > span {
  bottom: 0;
  display: block;
  inset-inline: 0;
  padding: 14px;
  position: absolute;
  z-index: 2;
}

.concept-start__grid .begin-four-corridor__card small,
.concept-start__grid .begin-four-corridor__card strong,
.concept-start__grid .begin-four-corridor__card em {
  display: block;
  margin: 0;
  text-shadow: 0 2px 14px #000;
}

.concept-start__grid .begin-four-corridor__card small {
  font: 800 .53rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .08em;
}

.concept-start__grid .begin-four-corridor__card strong {
  font-size: clamp(1rem, 1.7vw, 1.45rem);
  line-height: 1;
  margin-top: 7px;
}

.concept-start__grid .begin-four-corridor__card em {
  color: #c3d0cd;
  font: 700 .48rem/1.2 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .05em;
  margin-top: 5px;
}

.begin-four-corridor__room {
  align-items: flex-end;
  background: #06131a;
  border: 1px solid rgba(var(--accent-green-rgb), .55);
  display: flex;
  opacity: .08;
  overflow: hidden;
  padding: 7%;
  transform: translateZ(-330px) scale(.54);
  transition: transform .9s cubic-bezier(.16, 1, .3, 1), opacity .58s ease, filter .58s ease;
  z-index: 1;
}

.begin-four-corridor__room > img {
  height: 100%;
  inset: 0;
  object-fit: cover;
  position: absolute;
  width: 100%;
}

.begin-four-corridor__shade {
  background: linear-gradient(90deg, rgba(2, 8, 13, .94), rgba(2, 8, 13, .22) 68%, rgba(2, 8, 13, .68));
  inset: 0;
  position: absolute;
}

.begin-four-corridor__content {
  background: linear-gradient(90deg, rgba(1, 8, 12, .9), rgba(1, 8, 12, .5));
  border-left: 2px solid var(--accent-green);
  max-width: min(54%, 380px);
  padding: 18px 20px;
  position: relative;
  width: 100%;
  z-index: 2;
}

.begin-four-corridor__content > p:first-child {
  color: var(--accent-green);
  font: 800 .5rem/1.3 ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .1em;
  margin: 0;
  text-transform: uppercase;
}

.begin-four-corridor__content h3 {
  color: #f2faf7;
  font-size: clamp(1.75rem, 3.2vw, 3rem);
  line-height: .92;
  margin: 8px 0 5px;
}

.begin-four-corridor__content > p:not(:first-child) {
  color: #c6d6d2;
  font: 700 .58rem/1.35 ui-monospace, SFMono-Regular, Consolas, monospace;
  margin: 0 0 14px;
}

.begin-four-corridor__open,
.begin-four-corridor__return {
  align-items: center;
  background: rgba(1, 8, 12, .88);
  border: 1px solid rgba(var(--accent-green-rgb), .62);
  color: #fff;
  display: inline-flex;
  font: 800 .55rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
  justify-content: center;
  letter-spacing: .08em;
  min-height: 36px;
  padding: 0 12px;
  text-decoration: none;
  text-transform: uppercase;
}

.begin-four-corridor__open:hover,
.begin-four-corridor__open:focus-visible,
.begin-four-corridor__return:hover,
.begin-four-corridor__return:focus-visible {
  background: var(--accent-green);
  color: #021018;
  outline: none;
}

.begin-four-corridor__gates {
  pointer-events: none;
  z-index: 6;
}

.begin-four-corridor__gates i {
  border: 1px solid rgba(var(--accent-green-rgb), var(--gate-border));
  inset: var(--gate-inset);
  opacity: 0;
  position: absolute;
  transform: translateZ(var(--gate-z)) scale(var(--gate-scale));
  transition: transform .8s cubic-bezier(.2, .8, .18, 1), opacity .35s;
}

.begin-four-corridor__return {
  bottom: 1%;
  cursor: pointer;
  left: 50%;
  opacity: 0;
  pointer-events: none;
  position: absolute;
  transform: translate(-50%, 12px);
  transition: opacity .3s, transform .3s;
  z-index: 12;
}

.begin-four-corridor__return:disabled {
  visibility: hidden;
}

.begin-four-corridor[data-begin-four-state="primed"] .begin-four-corridor__wall {
  opacity: .18;
  transform: translateZ(80px) scale(.82);
}

.begin-four-corridor[data-begin-four-state="primed"] .begin-four-corridor__gates i {
  opacity: var(--gate-prime-opacity);
  transform: translateZ(var(--gate-prime-z)) scale(var(--gate-prime-scale));
}

.begin-four-corridor[data-begin-four-state="traveling"] .begin-four-corridor__gates i {
  opacity: 0;
  transform: translateZ(var(--gate-fly-z)) scale(var(--gate-fly-scale));
  transition-delay: var(--gate-delay);
}

.begin-four-corridor[data-begin-four-state="traveling"] .begin-four-corridor__wall {
  opacity: 0;
  transform: translateZ(760px) scale(1.8);
}

.begin-four-corridor[data-begin-four-state="traveling"] .begin-four-corridor__room {
  opacity: .72;
  transform: translateZ(-10px) scale(.86);
  z-index: 7;
}

.begin-four-corridor[data-begin-four-state="deep"] .begin-four-corridor__room {
  opacity: 1;
  transform: translateZ(95px) scale(1);
  z-index: 8;
}

.begin-four-corridor[data-begin-four-state="deep"] .begin-four-corridor__wall {
  filter: blur(5px);
  opacity: 0;
  pointer-events: none;
  transform: translateZ(560px) scale(1.35);
}

.begin-four-corridor[data-begin-four-state="deep"] .begin-four-corridor__return {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.begin-four-corridor[data-begin-four-state="returning"] .begin-four-corridor__room {
  opacity: 0;
  transform: translateZ(-220px) scale(.66);
}

.begin-four-corridor[data-begin-four-state="returning"] .begin-four-corridor__wall {
  opacity: 1;
  transform: translateZ(155px) rotateX(1deg) rotateY(-1deg);
}

@media (max-width: 900px) {
  .concept-start--corridor {
    grid-template-columns: 1fr;
  }
  .concept-start--corridor > .section-heading {
    display: grid;
    gap: 24px;
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }
  .concept-start--corridor > .section-heading > p {
    margin: 0;
  }
  .concept-start--corridor > .section-heading h2 {
    font-size: clamp(2.8rem, 10vw, 5rem);
  }
}

@media (max-width: 560px) {
  .concept-start--corridor > .section-heading {
    display: block;
  }
  .concept-start--corridor > .section-heading > p {
    margin-top: 18px;
  }
  .begin-four-corridor__instrument {
    aspect-ratio: 1.04;
  }
  .begin-four-corridor__space {
    inset: 2% 0 8%;
  }
  .begin-four-corridor__wall,
  .begin-four-corridor__room,
  .begin-four-corridor__gates {
    aspect-ratio: 1.12;
    width: 96%;
  }
  .concept-start__grid .begin-four-corridor__card > span {
    padding: 10px;
  }
  .concept-start__grid .begin-four-corridor__card em {
    display: none;
  }
  .begin-four-corridor__content {
    max-width: 76%;
    padding: 14px;
  }
  .begin-four-corridor__content h3 {
    font-size: clamp(1.5rem, 8vw, 2.4rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .begin-four-corridor__wall,
  .begin-four-corridor__room,
  .begin-four-corridor__gates i,
  .begin-four-corridor__return,
  .begin-four-corridor__card {
    animation: none !important;
    transition: none !important;
  }
  .begin-four-corridor__gates {
    display: none;
  }
}