/*
 * v3.4 seamless reference-metal button
 *
 * Compact and standard controls use the unmodified Paper liquid-metal shader
 * from the last owner-approved narrow-button state. Only very wide controls
 * switch renderers: they sample that same fixed reference material and map it
 * around the measured perimeter at native scale instead of stretching it.
 */
.metal-button.reference-button {
  --button-radius: 12px;
  position: relative;
  isolation: isolate;
  box-sizing: border-box;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 54px;
  padding: 0 22px;
  overflow: hidden;
  border: 0;
  border-radius: var(--button-radius);
  appearance: none;
  color: var(--lu-paper);
  background: #080d12;
  box-shadow:
    0 13px 32px rgba(0, 0, 0, 0.34),
    inset 0 1px 0 rgba(255, 255, 255, 0.055),
    inset 0 -1px 0 rgba(0, 0, 0, 0.88);
  font-family: var(--lu-sans);
  font-size: 12px;
  font-weight: 620;
  line-height: 1;
  letter-spacing: 0.015em;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition:
    transform 240ms cubic-bezier(0.22, 1, 0.36, 1),
    color 220ms ease,
    box-shadow 360ms cubic-bezier(0.22, 1, 0.36, 1),
    filter 300ms ease;
}

.metal-button.reference-button::before,
.metal-button.reference-button::after {
  content: none;
  display: none;
  animation: none;
}

.metal-button.reference-button.reference-button--compact {
  min-height: 46px;
  padding-inline: 17px;
  font-size: 11px;
}

.metal-button.reference-button.reference-button--standard {
  min-height: 54px;
}

.metal-button.reference-button.reference-button--large {
  min-height: 58px;
  padding-inline: 28px;
  font-size: 13px;
}

.metal-button.reference-button.reference-button--full {
  width: 100%;
}

.metal-button.reference-button.reference-button--secondary {
  color: rgba(231, 235, 237, 0.9);
  background: #070c11;
}

.metal-button.reference-button.reference-button--quiet {
  color: rgba(218, 224, 227, 0.78);
  background: rgba(5, 11, 16, 0.96);
  box-shadow:
    0 9px 24px rgba(0, 0, 0, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.045);
}

.reference-button__shader,
.reference-button__perimeter {
  position: absolute;
  z-index: 0;
  display: block;
  overflow: hidden;
  border-radius: inherit;
  opacity: 0;
  pointer-events: none;
}

.metal-button.reference-button:not(.reference-button--ready) {
  box-shadow:
    0 0 0 1px rgba(103, 115, 124, 0.62),
    0 13px 32px rgba(0, 0, 0, 0.34),
    inset 0 1px 0 rgba(255, 255, 255, 0.055),
    inset 0 -1px 0 rgba(0, 0, 0, 0.88);
}

.reference-button__shader[data-metal-profile="reference"] {
  inset: 0;
}

.reference-button__shader[data-metal-profile="perimeter"] {
  top: 0;
  left: 0;
  width: 246px;
  height: 58px;
}

.reference-button__shader canvas {
  position: absolute !important;
  inset: 0 !important;
  display: block !important;
  width: 100% !important;
  height: 100% !important;
  border-radius: inherit !important;
  transform: none !important;
}

.reference-button--ready:not(.reference-button--perimeter)
  .reference-button__shader {
  opacity: 1;
}

.reference-button__perimeter {
  inset: 0;
  width: 100%;
  height: 100%;
}

.reference-button--ready.reference-button--perimeter
  .reference-button__perimeter {
  opacity: 1;
}

.reference-button__surface {
  position: absolute;
  z-index: 1;
  inset: 1.1px;
  overflow: hidden;
  border-radius: calc(var(--button-radius) - 1.1px);
  background:
    radial-gradient(
      125% 170% at 50% -98%,
      rgba(255, 255, 255, 0.075),
      transparent 59%
    ),
    linear-gradient(180deg, #0b1117 0%, #03070b 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.045),
    inset 0 -1px 0 rgba(0, 0, 0, 0.86);
  pointer-events: none;
}

.reference-button__surface::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    linear-gradient(
      106deg,
      transparent 13%,
      rgba(255, 255, 255, 0.022) 48%,
      transparent 77%
    ),
    radial-gradient(
      circle at 50% 125%,
      rgba(201, 164, 92, 0.075),
      transparent 48%
    );
}

.reference-button__label,
.reference-button__arrow {
  position: relative;
  z-index: 2;
}

.reference-button__label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
}

.reference-button__arrow {
  width: 16px;
  flex: 0 0 16px;
  color: rgba(225, 195, 123, 0.86);
  transition: transform 180ms var(--lu-ease-out);
}

.metal-button.reference-button:hover {
  color: #fff;
  transform: translateY(-0.5px);
  box-shadow:
    0 16px 38px rgba(0, 0, 0, 0.42),
    0 0 22px rgba(201, 164, 92, 0.045),
    inset 0 1px 0 rgba(255, 255, 255, 0.07);
}

.metal-button.reference-button:hover .reference-button__shader,
.metal-button.reference-button:hover .reference-button__perimeter {
  filter: brightness(1.035) saturate(1.015);
}

.metal-button.reference-button:hover .reference-button__arrow {
  transform: translateX(2px);
}

.metal-button.reference-button:focus-visible {
  outline: 1px solid var(--lu-focus-platinum);
  outline-offset: 3px;
}

.metal-button.reference-button:active {
  transform: translateY(0) scale(0.985);
}

.metal-button.reference-button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
  filter: saturate(0.45);
}

@media (max-width: 760px) {
  .metal-button.reference-button.reference-button--large,
  .metal-button.reference-button.metal-button--full-mobile {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .metal-button.reference-button,
  .reference-button__arrow {
    transition: none;
  }
}