/* Patina — aging desk calculator */

:root {
  --desk-0: #6b7c8a;
  --desk-1: #4a5a66;
  --desk-2: #3a4852;
  --ink: #1a2228;
  --muted: #5a6872;
  --plastic: #f4f5f2;
  --plastic-edge: #d8dbd4;
  --key: #eef0eb;
  --key-op: #dde3e0;
  --key-accent: #2c363c;
  --lcd-bg: #c5d4b8;
  --lcd-ink: #1e2a18;
  --yellow: 0;
  --haze: 0;
  --scuff: 0;
  --age: 0;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  font-family: "Sora", system-ui, sans-serif;
  color: var(--ink);
  background: var(--desk-2);
  overflow-x: hidden;
}

.desk {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 90% 60% at 50% 35%, #7a8b98 0%, transparent 55%),
    linear-gradient(165deg, var(--desk-0), var(--desk-1) 45%, var(--desk-2));
  z-index: 0;
}

.desk::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  pointer-events: none;
}

.stage {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  gap: clamp(1.25rem, 3vw, 2rem);
}

.brand {
  text-align: center;
  max-width: 22rem;
}

.brand__mark {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  color: #f2f5f7;
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.18);
}

.brand__lede {
  margin: 0.65rem 0 0;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.45;
  color: rgba(242, 245, 247, 0.72);
}

.scene {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 1rem;
  min-height: 28rem;
}

.calculator {
  --body-yellow: color-mix(in srgb, var(--plastic) calc(100% - var(--yellow) * 55%), #c9a54a);
  --body-edge: color-mix(in srgb, var(--plastic-edge) calc(100% - var(--yellow) * 45%), #a8842e);
  position: relative;
  width: min(20rem, 92vw);
  padding: 1.1rem 1rem 1.15rem;
  border-radius: 1.35rem;
  background:
    linear-gradient(
      160deg,
      color-mix(in srgb, var(--body-yellow) 92%, white) 0%,
      var(--body-yellow) 42%,
      color-mix(in srgb, var(--body-yellow) 88%, var(--body-edge)) 100%
    );
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.45) inset,
    0 -2px 6px rgba(0, 0, 0, 0.08) inset,
    0 18px 40px rgba(20, 28, 34, 0.35),
    0 4px 10px rgba(20, 28, 34, 0.2);
  transform: translateY(0);
  transition: filter 0.8s var(--ease), transform 0.5s var(--ease);
  filter: saturate(calc(1 - var(--age) * 0.12));
}

.calculator.is-cleaning {
  animation: polish 1.1s var(--ease);
}

@keyframes polish {
  0% {
    filter: brightness(1);
  }
  35% {
    filter: brightness(1.18) saturate(1.05);
    transform: translateY(-4px);
  }
  100% {
    filter: brightness(1);
    transform: translateY(0);
  }
}

.calculator__sheen {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(
    125deg,
    rgba(255, 255, 255, 0.35) 0%,
    transparent 38%,
    transparent 62%,
    rgba(255, 255, 255, 0.08) 100%
  );
  opacity: calc(0.9 - var(--age) * 0.55);
  pointer-events: none;
  z-index: 2;
}

.calculator__scuffs {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: var(--scuff);
  pointer-events: none;
  z-index: 3;
  background:
    radial-gradient(ellipse 40% 18% at 18% 72%, rgba(90, 70, 40, 0.18), transparent 70%),
    radial-gradient(ellipse 30% 14% at 82% 28%, rgba(60, 50, 30, 0.14), transparent 70%),
    radial-gradient(ellipse 24% 10% at 55% 88%, rgba(80, 60, 30, 0.16), transparent 70%);
  mix-blend-mode: multiply;
}

.calculator__top {
  position: relative;
  z-index: 4;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.15rem 0.35rem 0.7rem;
}

.calculator__logo {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--ink) 70%, var(--body-edge));
  opacity: calc(0.55 + var(--age) * 0.15);
}

.calculator__model {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  opacity: 0.85;
}

.screen-wrap {
  position: relative;
  z-index: 4;
  margin-bottom: 0.95rem;
  padding: 0.45rem;
  border-radius: 0.65rem;
  background: color-mix(in srgb, var(--body-edge) 80%, #888);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.25),
    0 2px 4px rgba(0, 0, 0, 0.18) inset;
}

.screen {
  position: relative;
  height: 4.1rem;
  padding: 0.55rem 0.75rem;
  border-radius: 0.35rem;
  background: color-mix(in srgb, var(--lcd-bg) calc(100% - var(--yellow) * 35%), #9aaa6e);
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.08) inset;
}

.screen__haze {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.12), transparent 40%),
    radial-gradient(ellipse at 70% 30%, rgba(40, 50, 20, 0.2), transparent 55%);
  opacity: var(--haze);
  pointer-events: none;
}

.screen__ghost {
  position: absolute;
  right: 0.75rem;
  bottom: 0.55rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.85rem;
  font-weight: 500;
  color: var(--lcd-ink);
  opacity: calc(var(--haze) * 0.18);
  letter-spacing: 0.04em;
  pointer-events: none;
}

.screen__value {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  border: 0;
  background: transparent;
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-align: right;
  color: color-mix(in srgb, var(--lcd-ink) calc(100% - var(--haze) * 25%), #4a5a38);
  line-height: 3rem;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.keys {
  position: relative;
  z-index: 4;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(5, 3rem);
  gap: 0.55rem;
  min-height: calc(5 * 3rem + 4 * 0.55rem);
}

.key {
  --fp: 0;
  --loose: 0;
  position: relative;
  appearance: none;
  border: 0;
  height: 3rem;
  border-radius: 0.55rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  background: linear-gradient(180deg, #f5f6f2, #e8ebe4);
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--key) 90%, white),
    color-mix(in srgb, var(--key) calc(100% - var(--yellow) * 40%), #d4b56a)
  );
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.55) inset,
    0 -1px 0 rgba(0, 0, 0, 0.06) inset,
    0 3px 0 color-mix(in srgb, var(--body-edge) 70%, #999),
    0 4px 8px rgba(0, 0, 0, 0.12);
  transform: translateY(0) rotate(calc(var(--loose) * 1.2deg));
  transition: transform 0.12s ease, box-shadow 0.12s ease, filter 0.3s ease;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.key--op {
  background: linear-gradient(
    180deg,
    color-mix(in srgb, var(--key-op) 92%, white),
    color-mix(in srgb, var(--key-op) calc(100% - var(--yellow) * 40%), #c9ae6a)
  );
  color: #243038;
}

.key--accent {
  background: linear-gradient(
    180deg,
    color-mix(in srgb, #3a464e 80%, white),
    color-mix(in srgb, var(--key-accent) calc(100% - var(--yellow) * 20%), #5a4a28)
  );
  color: #f4f6f5;
}

.key::after {
  content: "";
  position: absolute;
  inset: 12% 18% 28% 18%;
  border-radius: 50%;
  background:
    radial-gradient(ellipse at 35% 30%, rgba(255, 255, 255, 0.18), transparent 45%),
    radial-gradient(ellipse at 60% 65%, rgba(90, 70, 50, 0.45), transparent 70%);
  opacity: var(--fp);
  pointer-events: none;
  mix-blend-mode: multiply;
  filter: blur(0.4px);
}

.key:active,
.key.is-pressed {
  transform: translateY(2px) rotate(calc(var(--loose) * 2.5deg));
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.35) inset,
    0 1px 0 color-mix(in srgb, var(--body-edge) 70%, #999),
    0 2px 4px rgba(0, 0, 0, 0.1);
}

.key.is-loose:active,
.key.is-loose.is-pressed {
  animation: wobble 0.35s ease;
}

@keyframes wobble {
  0%,
  100% {
    transform: translateY(2px) rotate(calc(var(--loose) * 2deg));
  }
  30% {
    transform: translateY(3px) rotate(calc(var(--loose) * -4deg));
  }
  60% {
    transform: translateY(2px) rotate(calc(var(--loose) * 5deg));
  }
}

.key.is-missing {
  visibility: hidden;
  pointer-events: none;
}

.key.is-falling {
  visibility: visible;
  z-index: 20;
  animation: fall-off 1.15s var(--ease) forwards;
  pointer-events: none;
}

@keyframes fall-off {
  0% {
    transform: translate(0, 0) rotate(0deg);
    opacity: 1;
  }
  25% {
    transform: translate(12px, 8px) rotate(18deg);
  }
  55% {
    transform: translate(48px, 90px) rotate(-12deg);
  }
  80% {
    transform: translate(72px, 150px) rotate(28deg);
  }
  100% {
    transform: translate(86px, 175px) rotate(38deg);
    opacity: 0;
  }
}

.fallen-slot {
  position: absolute;
  right: -0.5rem;
  bottom: 0.5rem;
  width: 3.4rem;
  height: 3.4rem;
  pointer-events: none;
}

.fallen-slot:has(.fallen-key) {
  pointer-events: auto;
}

.fallen-key {
  appearance: none;
  border: 0;
  width: 3rem;
  height: 3rem;
  border-radius: 0.55rem;
  font-family: "IBM Plex Mono", monospace;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  cursor: grab;
  background: linear-gradient(180deg, #e8d9a8, #d4b56a);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.4) inset,
    0 6px 14px rgba(0, 0, 0, 0.28);
  transform: rotate(38deg);
  animation: land 0.45s var(--ease);
}

.fallen-key:active {
  cursor: grabbing;
}

@keyframes land {
  from {
    transform: translateY(-18px) rotate(28deg);
    opacity: 0.6;
  }
  to {
    transform: rotate(38deg);
    opacity: 1;
  }
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem 1.5rem;
  width: min(22rem, 92vw);
}

.meter {
  flex: 1 1 12rem;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.55rem;
  color: rgba(242, 245, 247, 0.75);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.meter__track {
  height: 0.28rem;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.22);
  overflow: hidden;
}

.meter__fill {
  height: 100%;
  width: 0%;
  border-radius: inherit;
  background: linear-gradient(90deg, #d7e0e6, #e2c57a);
  transition: width 0.35s var(--ease);
}

.meter__count {
  grid-column: 1 / -1;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0;
  text-transform: none;
  opacity: 0.8;
}

.clean {
  appearance: none;
  border: 1px solid rgba(242, 245, 247, 0.28);
  background: rgba(242, 245, 247, 0.08);
  color: #f2f5f7;
  font-family: "Sora", system-ui, sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.65rem 1.15rem;
  border-radius: 0.55rem;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.clean:hover {
  background: rgba(242, 245, 247, 0.16);
  border-color: rgba(242, 245, 247, 0.45);
}

.clean:active {
  transform: translateY(1px);
}

@media (max-width: 420px) {
  .scene {
    min-height: 26rem;
  }

  .key {
    height: 2.75rem;
    font-size: 0.95rem;
  }

  .fallen-slot {
    right: 0;
    bottom: -0.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}