:root{
  --bg-1: #0c0c0e;
  --bg-2: #050506;
  --card-top: #2b2b30;
  --card-top-2: #1c1c1f;
  --card-bottom: #201f22;
  --card-bottom-2: #141315;
  --digit-color: #efece3;
  --accent: #c9a13b;
  --label-color: #6c6c72;
  --radius: 8px;

  --digit-w: clamp(56px, 11vw, 210px);
  --digit-h: clamp(84px, 26.5vw, 315px);
  --colon-w: clamp(20px, 4vw, 54px);
  --gap-d: clamp(4px, 1vw, 12px);
  --font-num: clamp(60px, 13vw, 250px);
}

*{ box-sizing: border-box; }

html, body{
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--bg-2);
}

body{
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Oswald', 'Arial Narrow', Arial, sans-serif;
}

body.hide-cursor, body.hide-cursor *{
  cursor: none;
}

.stage{
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(18px, 3vw, 36px);
  background:
    radial-gradient(ellipse at center, var(--bg-1) 0%, var(--bg-2) 75%);
}

/* ---------- Clock layout ---------- */

.clock{
  display: grid;
  grid-template-columns:
    var(--digit-w) var(--digit-w) var(--colon-w)
    var(--digit-w) var(--digit-w) var(--colon-w)
    var(--digit-w) var(--digit-w);
  column-gap: var(--gap-d);
  align-items: center;
  justify-content: center;
}

.labels{
  display: grid;
  grid-template-columns:
    var(--digit-w) var(--digit-w) var(--colon-w)
    var(--digit-w) var(--digit-w) var(--colon-w)
    var(--digit-w) var(--digit-w);
  column-gap: var(--gap-d);
  width: 100%;
  justify-content: center;
}

.label{
  text-align: center;
  color: var(--label-color);
  font-size: clamp(10px, 1.2vw, 16px);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  font-weight: 500;
}

.label--hours{ grid-column: 1 / 3; }
.label--minutes{ grid-column: 4 / 6; }
.label--seconds{ grid-column: 7 / 9; }

.date{
  color: var(--label-color);
  font-size: clamp(12px, 1.4vw, 20px);
  letter-spacing: 0.08em;
  text-transform: capitalize;
}

/* ---------- Colon ---------- */

.colon{
  height: var(--digit-h);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(14px, 3vw, 54px);
}

.colon span{
  width: clamp(8px, 1.5vw, 16px);
  height: clamp(8px, 1.5vw, 16px);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(201, 161, 59, 0.55);
}

/* ---------- Digit card ---------- */

.digit{
  position: relative;
  width: var(--digit-w);
  height: var(--digit-h);
  perspective: 900px;
  filter: drop-shadow(0 14px 22px rgba(0,0,0,0.55));
}

.digit::after{
  /* hinge seam */
  content: "";
  position: absolute;
  left: 0; right: 0; top: 50%;
  height: 2px;
  transform: translateY(-1px);
  background: rgba(0,0,0,0.7);
  box-shadow: 0 1px 0 rgba(255,255,255,0.05);
  z-index: 6;
  pointer-events: none;
}

.digit::before{
  /* corner rivets */
  content: "";
  position: absolute;
  width: 0; height: 0;
  top: 0; left: 0;
  border-radius: 50%;
  box-shadow:
    7px 7px 0 1px rgba(255,255,255,0.06),
    calc(100% - 7px) 7px 0 1px rgba(255,255,255,0.06),
    7px calc(100% - 7px) 0 1px rgba(255,255,255,0.06),
    calc(100% - 7px) calc(100% - 7px) 0 1px rgba(255,255,255,0.06);
  z-index: 7;
  pointer-events: none;
}

.digit-half, .digit-leaf{
  position: absolute;
  left: 0;
  width: 100%;
  height: 50%;
  overflow: hidden;
  border-radius: var(--radius);
}

.digit-half--top, .digit-leaf--front{
  top: 0;
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
  background: linear-gradient(180deg, var(--card-top) 0%, var(--card-top-2) 100%);
  box-shadow: inset 0 -6px 10px -6px rgba(0,0,0,0.5);
}

.digit-half--bottom, .digit-leaf--back{
  bottom: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  background: linear-gradient(180deg, var(--card-bottom) 0%, var(--card-bottom-2) 100%);
  box-shadow: inset 0 6px 10px -6px rgba(0,0,0,0.55);
}

.digit-half{ z-index: 1; }

.digit-num-wrap{
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 200%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.digit-half--bottom .digit-num-wrap,
.digit-leaf--back .digit-num-wrap{
  top: -100%;
}

.digit-num{
  font-size: var(--font-num);
  line-height: 1;
  font-weight: 600;
  color: var(--digit-color);
  user-select: none;
}

/* ---------- Flip leaves ---------- */

.digit-leaf{
  transform-style: preserve-3d;
  backface-visibility: hidden;
}

.digit-leaf--front{
  transform-origin: bottom center;
  transform: rotateX(0deg);
  z-index: 4;
}

.digit-leaf--back{
  transform-origin: top center;
  transform: rotateX(90deg);
  z-index: 2;
}

@keyframes foldTop{
  0%   { transform: rotateX(0deg); }
  100% { transform: rotateX(-90deg); }
}

@keyframes foldBottom{
  0%   { transform: rotateX(90deg); }
  100% { transform: rotateX(0deg); }
}

.digit.flipping .digit-leaf--front{
  animation: foldTop 0.3s cubic-bezier(.37,.01,.94,.68) forwards;
}

.digit.flipping .digit-leaf--back{
  animation: foldBottom 0.3s cubic-bezier(.15,.45,.28,1) forwards;
  animation-delay: 0.3s;
}

/* ---------- Fullscreen button ---------- */

.fs-btn{
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  color: var(--label-color);
  font-size: 18px;
  cursor: pointer;
  transition: opacity 0.3s ease, background 0.2s ease, color 0.2s ease;
  opacity: 0.7;
}

.fs-btn:hover{
  background: rgba(255,255,255,0.09);
  color: var(--digit-color);
}

body.hide-cursor .fs-btn{
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 480px){
  :root{
    --gap-d: 3px;
  }
  .fs-btn{
    width: 38px; height: 38px; font-size: 15px; bottom: 14px; right: 14px;
  }
}