html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: #ffffff;
  font-family: system-ui, sans-serif;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

.stopwatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

/* The Border.png sits behind the digits as a rectangular frame. */
.display {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 48px 72px;
  background-image: url('Assets/Border.png');
  background-size: 100% 100%;
  background-repeat: no-repeat;
  background-position: center;
}

/* Overlays the left edge of the border — does NOT resize the rectangle. */
.neg-sign {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translate(-50%, -50%);
  height: 96px;
  width: auto;
  z-index: 2;
  pointer-events: none;
  -webkit-user-drag: none;
  user-select: none;
}

.digit {
  height: 96px;
  width: auto;
  display: block;
  image-rendering: pixelated;
  -webkit-user-drag: none;
  user-select: none;
}

.sep {
  font-size: 80px;
  line-height: 1;
  color: #000000;
  font-weight: 700;
  padding: 0 4px;
}

.dec-sep {
  height: 96px;
  width: auto;
  display: block;
  align-self: flex-end;
  padding: 0 4px;
  -webkit-user-drag: none;
  user-select: none;
}

.controls {
  display: flex;
  align-items: center;
  gap: 24px;
}

.btn-sep {
  height: 56px;
  width: auto;
  display: block;
  -webkit-user-drag: none;
  user-select: none;
}

.btn {
  height: 72px;
  width: auto;
  cursor: pointer;
  transition: transform 0.08s ease-out;
  -webkit-user-drag: none;
  user-select: none;
}

.btn:hover  { transform: scale(1.005); }
.btn:active { transform: scale(1.0); }

/* Invisible-on-white real-time readout in the top-left corner.
   Becomes visible when the user selects/highlights the text. */
.real-time {
  position: fixed;
  top: 12px;
  left: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 16px;
  color: #ffffff;
  background: transparent;
  z-index: 1;
  white-space: pre-wrap;
}

.vibe-coded {
  position: fixed;
  bottom: 20px;
  right: 20px;
  height: 80px;
  width: auto;
  pointer-events: none;
  -webkit-user-drag: none;
  user-select: none;
}

@media (max-width: 700px) {
  .display { padding: 32px 40px; }
  .digit   { height: 60px; }
  .sep     { font-size: 52px; }
  .btn     { height: 56px; }
}