*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  background: #18181b;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.keyboard-board {
  background: #27272a;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.8), inset 0 2px 2px rgba(255,255,255,0.05);
  border: 1px solid #111827;
}

.mech-key {
  position: relative;
  background: transparent;
  border: none;
  padding: 0;
  width: 140px;
  height: 100px;
  cursor: pointer;
  outline: none;
}

.key-base {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 90px;
  background: #09090b;
  border-radius: 12px;
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.8);
  z-index: 1;
}

.key-cap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 90px;
  background: linear-gradient(180deg, #52525b, #3f3f46);
  border-radius: 12px;
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: center;
  /* Top highlighting and profound bottom shadow for depth */
  box-shadow: inset 0 2px 2px rgba(255,255,255,0.2), inset 0 -6px 10px rgba(0,0,0,0.6), 0 10px 0 #18181b, 0 10px 10px rgba(0,0,0,0.5);
  transition: transform 0.1s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.1s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid #71717a;
  border-bottom: none;
}

.key-legend {
  color: #e4e4e7;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 1px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

/* The satisfying press interaction */
.mech-key:active .key-cap {
  transform: translateY(8px);
  /* Compress the shadow to mimic physical travel distance */
  box-shadow: inset 0 2px 2px rgba(255,255,255,0.2), inset 0 -2px 6px rgba(0,0,0,0.6), 0 2px 0 #18181b, 0 2px 5px rgba(0,0,0,0.5);
}