.u-btn {
  width: 140px;
  height: 50px;
  position: relative;
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  font-family:
    "Poppins",
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Helvetica Neue",
    Arial;
  -webkit-tap-highlight-color: transparent;
}

/* Top face */
.u-btn__top {
  width: 100%;
  height: 100%;
  background: rgb(255, 255, 238);
  font-size: 16px;
  color: rgb(36, 38, 34);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px; /* replaced mm with px for consistency */
  outline: 2px solid rgb(36, 38, 34);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

/* Bottom shadow/surface */
.u-btn__bottom {
  position: absolute;
  width: 100%;
  height: 100%;
  background: rgb(229, 229, 199);
  top: 10px;
  left: 0;
  border-radius: 12px;
  outline: 2px solid rgb(36, 38, 34);
  z-index: -1;
  box-sizing: border-box;
}

/* small vertical posts on the base */
.u-btn__bottom::before,
.u-btn__bottom::after {
  position: absolute;
  content: "";
  width: 2px;
  height: 9px;
  background: rgb(36, 38, 34);
  bottom: 0;
}
.u-btn__bottom::before {
  left: 15%;
}
.u-btn__bottom::after {
  left: 85%;
}

/* pressed state: move the top face down */
.u-btn:active .u-btn__top {
  transform: translateY(10px);
}

/* extra shading layer behind the base */
.u-btn::before {
  position: absolute;
  content: "";
  width: calc(100% + 2px);
  height: 100%;
  background: rgb(140, 140, 140);
  top: 14px;
  left: -1px;
  border-radius: 12px;
  outline: 2px solid rgb(36, 38, 34);
  z-index: -2;
}

/* gloss on the top face */
.u-btn__top::before {
  position: absolute;
  content: "";
  width: 15px;
  height: 100%;
  background: rgba(0, 0, 0, 0.1);
  transform: skewX(30deg);
  left: -20px;
  transition: left 0.25s ease;
  pointer-events: none;
}

/* animate gloss moving across when pressed */
.u-btn:active .u-btn__top::before {
  left: calc(100% + 20px);
}

/* keyboard-focus visible state for accessibility */
.u-btn:focus-visible .u-btn__top {
  box-shadow: 0 0 0 3px rgba(36, 38, 34, 0.12);
  outline: none;
}