:root {
  --ink: #0a0a0a;
  --grey: #6b6b6b;
  --light: #9a9a9a;
  --dlab-blue: #1f6f9c;
  --bg: #ffffff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  background: #000;
  color: var(--ink);
  font-family: "Oswald", "Arial Narrow", sans-serif;
  min-height: 100vh;
  text-align: center;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

/* ---------- Fullscreen film (behind the doors) ---------- */
.video-stage {
  position: fixed;
  inset: 0;
  z-index: 1;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-stage video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #000;
}

/* ---------- The doors ---------- */
.curtain {
  position: fixed;
  inset: 0;
  z-index: 20;
  perspective: 2200px;
}

.curtain.gone {
  display: none;
}

.door {
  position: absolute;
  top: 0;
  height: 100vh;
  width: 50vw;
  overflow: hidden;
  background: var(--bg);
  backface-visibility: hidden;
  transition: transform 1.15s cubic-bezier(0.76, 0, 0.24, 1),
    box-shadow 1.15s ease;
  will-change: transform;
}

.door.left {
  left: 0;
  transform-origin: left center;
}

.door.right {
  left: 50vw;
  transform-origin: right center;
}

/* hairline seam down the middle */
.door.left::after,
.door.right::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  background: rgba(0, 0, 0, 0.06);
}
.door.left::after { right: 0; }
.door.right::after { left: 0; }

.curtain.open .door.left {
  transform: rotateY(-115deg);
  box-shadow: 40px 0 80px rgba(0, 0, 0, 0.45);
}

.curtain.open .door.right {
  transform: rotateY(115deg);
  box-shadow: -40px 0 80px rgba(0, 0, 0, 0.45);
}

/* each door holds a full-viewport face; together they form the whole logo */
.face {
  position: absolute;
  top: 0;
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.door.left .face {
  left: 0;
}

.door.right .face {
  left: -100%; /* = -50vw, aligns logo centre to the page centre */
}

.logo {
  width: min(92vw, 760px);
  height: auto;
  display: block;
  user-select: none;
}

/* ---------- Start button ---------- */
.start-layer {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  pointer-events: none;
  transition: opacity 0.45s ease;
}

/* invisible spacer matching the logo so the button lands just below it */
.logo-box {
  width: min(92vw, 760px);
  aspect-ratio: 1920 / 1080;
  visibility: hidden;
}

.start-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: inherit;
  font-weight: 600;
  font-size: clamp(0.95rem, 2.4vw, 1.15rem);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  background: var(--ink);
  border: none;
  border-radius: 999px;
  padding: 0.85rem 1.9rem;
  cursor: pointer;
  pointer-events: auto;
  transition: transform 0.18s ease, background 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.18);
}

/* the copies inside the doors only reserve space */
.start-btn.placeholder {
  visibility: hidden;
}

.start-btn:hover {
  background: var(--dlab-blue);
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(31, 111, 156, 0.32);
}

.start-btn:active {
  transform: translateY(0);
}

.start-btn:focus-visible {
  outline: 3px solid var(--dlab-blue);
  outline-offset: 3px;
}

.play-icon {
  font-size: 0.8em;
  line-height: 1;
}

body.started .start-layer {
  opacity: 0;
  pointer-events: none;
}

/* ---------- Footer ---------- */
.footer {
  position: fixed;
  bottom: 1.4rem;
  left: 0;
  right: 0;
  z-index: 31;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--light);
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  align-items: center;
  transition: opacity 0.45s ease;
}

.footer a {
  color: var(--grey);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer a:hover {
  color: var(--ink);
}

.dot {
  opacity: 0.6;
}

body.started .footer {
  opacity: 0;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .door {
    transition: opacity 0.5s ease;
  }
  .curtain.open .door.left,
  .curtain.open .door.right {
    transform: none;
    opacity: 0;
  }
}