/* Kempe's Machine. Colours are Braun's (via Hue Atlas and the DR01 palette):
   anthracite housing, warm black keys, grey and pebble metal, white lettering.
   Colour means function: yellow is what the machine draws, taupe is what you
   drew, blue is the drive, red is the power switch. */

:root {
  --anthracite: #2e2e2c;
  --warm-black: #1a1a18;
  --grey: #8a8a87;
  --pebble: #c5c3be;
  --white: #f0ede5;
  --blue: #aab7bf;
  --yellow: #d4b018;
  --taupe: #bfb1a8;
  --red: #c02820;
  --well: #121210;
  --font: 'Instrument Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --deck-h: 132px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--anthracite);
  color: var(--white);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

button, input { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--white);
  outline-offset: 3px;
}

/* ---- the plate -------------------------------------------------------- */

.device {
  display: grid;
  grid-template-rows: 1fr var(--deck-h);
  height: 100vh;
  height: 100svh;
  min-height: 560px;
}

.stage {
  position: relative;
  overflow: hidden;
}

#view {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
}

.status {
  position: absolute;
  top: 18px;
  left: 24px;
  right: 440px;
  margin: 0;
  max-width: 62ch;
  color: var(--pebble);
  font-size: 14px;
  pointer-events: none;
}

.hint {
  position: absolute;
  left: 50%;
  bottom: 52px;
  transform: translateX(-50%);
  margin: 0;
  padding: 9px 16px;
  border-radius: 999px;
  background: rgba(26, 26, 24, 0.72);
  color: var(--white);
  font-size: 15px;
  white-space: nowrap;
  pointer-events: none;
}

.others {
  position: absolute;
  right: 24px;
  top: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--grey);
  font-size: 13px;
}
.others span { margin-right: 4px; }
.others[hidden] { display: none; }

.other {
  padding: 5px 11px;
  border: 1px solid #454542;
  border-radius: 999px;
  background: rgba(26, 26, 24, 0.6);
  color: var(--pebble);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
}
.other:hover { color: var(--white); border-color: var(--grey); }
.other[aria-pressed='true'] { color: var(--warm-black); background: var(--pebble); border-color: var(--pebble); }

.legend {
  position: absolute;
  left: 24px;
  bottom: 16px;
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--pebble);
  font-size: 13px;
  pointer-events: none;
}

.legend li { display: flex; align-items: center; gap: 8px; }

.swatch {
  display: inline-block;
  width: 22px;
  height: 3px;
  border-radius: 2px;
}
.swatch-ink { background: var(--yellow); }
.swatch-ghost { background: var(--taupe); opacity: 0.8; }

.nav-hint {
  position: absolute;
  right: 24px;
  bottom: 16px;
  margin: 0;
  color: var(--grey);
  font-size: 13px;
  pointer-events: none;
}

/* ---- the control deck --------------------------------------------------- */

.deck {
  display: grid;
  grid-template-columns: minmax(210px, 1.35fr) auto minmax(140px, 0.7fr) auto auto auto;
  align-items: center;
  gap: 22px;
  padding: 0 24px;
  background: var(--warm-black);
  border-top: 1px solid #262624;
}

.identity h1 {
  margin: 0 0 4px;
  font-size: 22px;
  font-weight: 600;
  font-stretch: 90%;
  letter-spacing: -0.01em;
}

.identity p {
  margin: 0;
  max-width: 46ch;
  color: var(--pebble);
  font-size: 13.5px;
}

.control {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.caption {
  color: var(--grey);
  font-size: 12.5px;
}

.keys {
  display: flex;
  gap: 10px;
}

.key {
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--anthracite);
  box-shadow: inset 0 1px 0 rgba(240, 237, 229, 0.08), 0 1px 2px rgba(0, 0, 0, 0.5);
  cursor: pointer;
  transition: background-color 120ms ease;
}

.key svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: var(--pebble);
  stroke-width: 1.6;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.key:hover { background: #3a3a37; }
.key:active { background: #242422; }

/* slider: a thin pebble track with a grey knob */
.machine-control { align-items: stretch; }

input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 28px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}

input[type='range']::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--grey);
  border-radius: 1px;
}
input[type='range']::-moz-range-track {
  height: 2px;
  background: var(--grey);
  border-radius: 1px;
}
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  margin-top: -10px;
  border-radius: 50%;
  background: var(--pebble);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.6), inset 0 -2px 0 rgba(0, 0, 0, 0.15);
}
input[type='range']::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border: 0;
  border-radius: 50%;
  background: var(--pebble);
}

.ends {
  display: flex;
  justify-content: space-between;
  color: var(--grey);
  font-size: 12.5px;
}

/* the display: a recessed window with three readings */
.display {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 10px 6px;
  border-radius: 10px;
  background: var(--well);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.6);
}

.display div {
  display: flex;
  flex-direction: column-reverse;
  align-items: center;
  min-width: 70px;
}

.display dt {
  color: var(--grey);
  font-size: 12px;
}

.display dd {
  margin: 0;
  font-size: 26px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.switches { gap: 6px; }

.switch {
  min-width: 118px;
  padding: 6px 12px;
  border: 0;
  border-radius: 6px;
  background: var(--anthracite);
  color: var(--pebble);
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(240, 237, 229, 0.06);
}
.switch:hover:not(:disabled) { background: #3a3a37; color: var(--white); }
.switch:disabled { opacity: 0.45; cursor: default; }
.switch[aria-pressed='true'] { color: var(--white); box-shadow: inset 3px 0 0 var(--blue); }

/* the power switch: Braun's red */
.power-button {
  width: 62px;
  height: 62px;
  border: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 38%, #d3321f, var(--red) 62%);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.6), inset 0 -3px 0 rgba(0, 0, 0, 0.2);
  cursor: pointer;
}
.power-button[aria-pressed='false'] {
  background: radial-gradient(circle at 50% 38%, #a8261a, #8e1f16 62%);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.5);
}
.power-button:active { transform: translateY(1px); }

/* ---- notes -------------------------------------------------------------- */

.notes {
  max-width: 68ch;
  margin: 0 auto;
  padding: 64px 24px 96px;
  color: var(--pebble);
  font-size: 16px;
  line-height: 1.6;
}

.notes h2 {
  margin: 0 0 16px;
  color: var(--white);
  font-size: 22px;
  font-weight: 600;
}

.notes h3 {
  margin: 36px 0 8px;
  color: var(--white);
  font-size: 16px;
  font-weight: 600;
}

.notes strong { color: var(--white); font-weight: 600; }
.notes a { color: var(--white); text-underline-offset: 3px; }

.notes table {
  width: 100%;
  margin: 20px 0;
  border-collapse: collapse;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}
.notes caption { text-align: left; color: var(--grey); padding-bottom: 8px; }
.notes th, .notes td { padding: 7px 10px 7px 0; text-align: left; border-bottom: 1px solid #3a3a37; }
.notes th { color: var(--white); font-weight: 500; }
.notes td.num, .notes th.num { text-align: right; }

.notes figure { margin: 28px 0; }
.notes figcaption { color: var(--grey); font-size: 14px; margin-top: 8px; }

/* ---- small screens ------------------------------------------------------ */

@media (max-width: 1240px) {
  .device { grid-template-rows: 1fr auto; }
  .deck {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      'id id'
      'shapes power'
      'machine display'
      'switches switches';
    gap: 16px 20px;
    padding: 18px 20px 22px;
  }
  .identity { grid-area: id; }
  .shapes-control { grid-area: shapes; align-items: flex-start; }
  .machine-control { grid-area: machine; }
  .display { grid-area: display; }
  .switches { grid-area: switches; flex-direction: row; flex-wrap: wrap; justify-content: flex-start; }
  .power { grid-area: power; }
  .device { height: auto; min-height: 0; }
  .stage { height: 64svh; min-height: 360px; }
}

@media (max-width: 560px) {
  .deck {
    grid-template-columns: 1fr;
    grid-template-areas: 'id' 'shapes' 'machine' 'display' 'switches' 'power';
    padding: 16px;
  }
  .keys { flex-wrap: wrap; }
  .display { justify-content: space-around; }
  .power { flex-direction: row; justify-content: flex-start; gap: 14px; }
  .nav-hint { display: none; }
  .status { left: 16px; right: 16px; top: 12px; font-size: 13px; }
  .others { top: 56px; left: 16px; right: 16px; flex-wrap: wrap; }
  .legend { left: 16px; }
  .switch { min-width: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .key, .switch { transition: none; }
}