/*
 * Mipmap Arcade styles.
 * Every colour and font lives in the token block below. The rest of the file, and
 * index.html, only ever read tokens through CSS custom properties. app.js reads the same tokens
 * at runtime to colour the rasterizer, so the canvas and the page can never drift apart.
 */
:root {
  --paper: #F6F4EE;
  --paper-2: #ECE8DC;
  --paper-3: #E1DCCD;
  --ink: #141618;
  --ink-2: #4A4F54;
  --rule: #CFC9B8;
  --vermilion: #D94E28;
  --vermilion-ink: #B03A19;
  --cyan: #0D7490;
  --cyan-ink: #0A5C73;
  --amber: #E8B04A;

  --sky-top: #BFD3D9;
  --sky-horizon: #ECE8DC;
  --fog: #ECE8DC;
  --grass: #B9C9A3;
  --asphalt: #3A3E43;
  --kerb-a: #D94E28;
  --kerb-b: #F6F4EE;
  --dash: #F6F4EE;
  --heat-0: #0D7490;
  --heat-1: #E8B04A;
  --heat-2: #D94E28;
  --heat-neutral: #ECE8DC;
  --divider: #141618;

  --font-ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2.25rem;
  --space-7: 3.5rem;
  --radius: 6px;
  --hairline: 1px;
  --focus-ring: 3px;
  --tap: 44px;
  --panel-width: 22.5rem;
  --page-width: 82rem;
  --split: 55%;
}

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

html,
body {
  margin: 0;
  overflow-x: clip;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

a {
  color: var(--cyan-ink);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--vermilion-ink);
}

:focus-visible {
  outline: var(--focus-ring) solid var(--cyan);
  outline-offset: 2px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--paper-2);
  padding: 0.08em 0.35em;
  border-radius: 3px;
}

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -4rem;
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius);
  z-index: 10;
}

.skip-link:focus {
  top: var(--space-3);
}

/* Masthead ------------------------------------------------------------ */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--page-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-5);
  border-bottom: var(--hairline) solid var(--rule);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--ink);
  text-decoration: none;
  min-height: var(--tap);
}

.brand-name {
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.mark-frame {
  fill: var(--paper-2);
  stroke: var(--ink);
  stroke-width: 1.5;
}

.mark-l0 {
  fill: var(--cyan);
}

.mark-l1 {
  fill: var(--amber);
}

.mark-l2 {
  fill: var(--vermilion);
}

.mark-l3 {
  fill: var(--ink);
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  justify-content: flex-end;
}

.top-nav a {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
  color: var(--ink-2);
  text-decoration: none;
  white-space: nowrap;
}

.top-nav a:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* Intro --------------------------------------------------------------- */

main {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 var(--space-5) var(--space-7);
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  align-items: end;
  gap: var(--space-3) var(--space-6);
  padding: var(--space-5) 0 var(--space-4);
}

.intro h1 {
  margin: 0;
  font-size: clamp(2.6rem, 6.5vw, 4.75rem);
  line-height: 0.95;
  font-weight: 800;
  letter-spacing: -0.045em;
  font-style: normal;
  overflow-wrap: anywhere;
  min-width: 0;
}

.lede {
  margin: 0;
  max-width: 44rem;
  color: var(--ink-2);
  font-size: 1.1rem;
}

/* Arcade layout ------------------------------------------------------- */

.arcade {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--panel-width);
  gap: var(--space-5);
  align-items: start;
}

.stage {
  position: sticky;
  top: var(--space-4);
  min-width: 0;
}

.viewport {
  position: relative;
  background: var(--paper-2);
  border: var(--hairline) solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  touch-action: none;
}

.viewport canvas {
  display: block;
  width: 100%;
  height: 100%;
  image-rendering: pixelated;
}

.hud {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  max-width: calc(100% - var(--space-5));
  pointer-events: none;
}

.hud-cell {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  border: var(--hairline) solid var(--rule);
  border-radius: var(--radius);
  padding: var(--space-1) var(--space-3);
}

.hud-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  white-space: nowrap;
}

.hud-unit {
  font-size: 0.8rem;
  color: var(--ink-2);
  white-space: nowrap;
}

.split-grip {
  position: absolute;
  left: var(--split);
  top: 30%;
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  margin: -1.375rem 0 0 -1.375rem;
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 0 2px 0 var(--ink);
  cursor: ew-resize;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.split-grip:hover,
.split-grip[data-dragging="true"] {
  background: var(--vermilion);
}

.split-grip[data-dragging="true"] {
  box-shadow: none;
  transform: translateY(2px);
}

.countdown {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(3rem, 12vw, 7rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--ink);
  text-shadow: 0 0 0.12em var(--paper), 0 0 0.35em var(--paper);
  pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
  .countdown[data-beat="a"] {
    animation: beat-a 0.9s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
  }

  .countdown[data-beat="b"] {
    animation: beat-b 0.9s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
  }

  .btn,
  .seg,
  .touch-btn {
    transition: background-color 0.12s ease, color 0.12s ease, transform 0.08s ease;
  }
}

@keyframes beat-a {
  from { opacity: 0; transform: scale(1.6); }
  35% { opacity: 1; transform: scale(1); }
  to { opacity: 1; transform: scale(0.94); }
}

@keyframes beat-b {
  from { opacity: 0; transform: scale(1.6); }
  35% { opacity: 1; transform: scale(1); }
  to { opacity: 1; transform: scale(0.94); }
}

.countdown[hidden] {
  display: none;
}

.toast {
  position: absolute;
  left: 50%;
  bottom: var(--space-5);
  transform: translateX(-50%);
  margin: 0;
  max-width: calc(100% - var(--space-5));
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius);
  font-weight: 600;
  text-align: center;
  pointer-events: none;
}

.toast[hidden] {
  display: none;
}

.mode-badge {
  position: absolute;
  right: var(--space-3);
  bottom: var(--space-3);
  margin: 0;
  background: var(--paper);
  border: var(--hairline) solid var(--ink);
  border-radius: var(--radius);
  padding: var(--space-1) var(--space-3);
  font-size: 0.85rem;
  font-weight: 600;
  pointer-events: none;
}

.mode-badge[data-driver="player"] {
  background: var(--ink);
  color: var(--paper);
}

.split-control {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 3.2rem;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) 0;
}

.split-control label {
  font-weight: 600;
}

.split-control input[type="range"] {
  width: 100%;
  min-height: var(--tap);
  accent-color: var(--vermilion);
  margin: 0;
}

.split-control output {
  font-family: var(--font-mono);
  text-align: right;
}

.legend {
  display: grid;
  grid-template-columns: auto minmax(2rem, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-3);
  color: var(--ink-2);
  font-size: 0.85rem;
}

.legend-bar {
  height: 0.6rem;
  border-radius: 3px;
  background: linear-gradient(to right, var(--heat-0), var(--heat-1), var(--heat-2));
}

.keys-help {
  margin: 0 0 var(--space-3);
  color: var(--ink-2);
  font-size: 0.92rem;
  max-width: 62ch;
}

/* Touch controls ------------------------------------------------------ */

.touch-controls {
  display: none;
  grid-template-columns: repeat(2, minmax(0, 1fr)) minmax(0, 2fr) repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

@media (pointer: coarse), (max-width: 40rem) {
  .stage {
    display: flex;
    flex-direction: column;
  }

  .touch-controls {
    display: grid;
    order: 1;
    margin-bottom: var(--space-3);
  }

  .keys-help {
    order: 2;
  }
}

.touch-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 3.5rem;
  background: var(--paper-2);
  color: var(--ink);
  border: var(--hairline) solid var(--ink);
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  touch-action: none;
  white-space: nowrap;
}

.touch-btn[data-active="true"] {
  background: var(--ink);
  color: var(--paper);
}

/* Panels -------------------------------------------------------------- */

.panels {
  display: grid;
  gap: var(--space-5);
  min-width: 0;
}

.panel {
  border-top: var(--hairline) solid var(--ink);
  padding-top: var(--space-3);
  min-width: 0;
}

.panel h2 {
  margin: 0 0 var(--space-3);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.panel-note {
  margin: var(--space-2) 0 0;
  color: var(--ink-2);
  font-size: 0.9rem;
}

.panel-canvas {
  display: block;
  width: 100%;
  height: auto;
  background: var(--paper-2);
  border: var(--hairline) solid var(--rule);
  border-radius: var(--radius);
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border: var(--hairline) solid var(--ink);
  border-radius: var(--radius);
  overflow: hidden;
}

.seg {
  min-height: var(--tap);
  background: var(--paper);
  color: var(--ink);
  border: 0;
  border-right: var(--hairline) solid var(--ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

.seg:last-child {
  border-right: 0;
}

.seg[aria-checked="true"] {
  background: var(--ink);
  color: var(--paper);
}

.seg:not([aria-checked="true"]):hover {
  background: var(--paper-2);
}

.button-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--tap);
  padding: 0 var(--space-3);
  background: var(--paper);
  color: var(--ink);
  border: var(--hairline) solid var(--ink);
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover {
  background: var(--paper-2);
}

.btn:active,
.seg:active,
.touch-btn:active {
  transform: translateY(1px);
}

.btn[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary {
  background: var(--vermilion);
  border-color: var(--vermilion);
  color: var(--ink);
}

.btn-primary:hover {
  background: var(--vermilion-ink);
  color: var(--paper);
}

.telemetry {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2) var(--space-4);
  margin: 0 0 var(--space-3);
}

.telemetry div {
  border-bottom: var(--hairline) solid var(--rule);
  padding-bottom: var(--space-1);
}

.telemetry dt {
  color: var(--ink-2);
  font-size: 0.85rem;
}

.telemetry dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
}

.meters {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-2) var(--space-3);
  align-items: center;
}

.meters label {
  font-size: 0.9rem;
}

.meters meter {
  width: 100%;
  height: 1.1rem;
}

.key {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-4);
  margin: var(--space-2) 0 0;
  padding: 0;
  list-style: none;
  color: var(--ink-2);
  font-size: 0.85rem;
}

.key li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.swatch {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 2px;
  flex: none;
}

.swatch-cyan {
  background: var(--cyan);
}

.swatch-vermilion {
  background: var(--vermilion);
}

.swatch-amber {
  background: color-mix(in srgb, var(--amber) 70%, var(--paper-2));
}

.swatch-outline {
  border: 2px solid var(--vermilion);
}

.meters meter {
  appearance: none;
  background: var(--paper-3);
  border: var(--hairline) solid var(--rule);
  border-radius: 999px;
  overflow: hidden;
}

.meters meter::-webkit-meter-bar {
  background: var(--paper-3);
  border: 0;
  height: 100%;
}

.meters meter::-webkit-meter-optimum-value,
.meters meter::-webkit-meter-suboptimum-value {
  background: var(--cyan);
  border-radius: 999px;
}

.meters meter::-webkit-meter-even-less-good-value {
  background: var(--vermilion);
  border-radius: 999px;
}

.meters meter::-moz-meter-bar {
  background: var(--cyan);
}

.meters meter:-moz-meter-sub-sub-optimum::-moz-meter-bar {
  background: var(--vermilion);
}

/* Explainer ----------------------------------------------------------- */

.how {
  margin-top: var(--space-7);
  border-top: var(--hairline) solid var(--ink);
  padding-top: var(--space-5);
}

.section-title {
  margin: 0 0 var(--space-5);
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-style: normal;
}

.how-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  gap: var(--space-5) var(--space-6);
}

.how-grid h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.1rem;
}

.how-grid p,
.prose {
  margin: 0;
  max-width: 62ch;
  color: var(--ink-2);
}

.announcer {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.footer {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: var(--space-5);
  border-top: var(--hairline) solid var(--rule);
  color: var(--ink-2);
  font-size: 0.9rem;
}

.footer p {
  margin: 0;
}

/* Responsive ---------------------------------------------------------- */

@media (max-width: 62rem) {
  .arcade {
    grid-template-columns: minmax(0, 1fr);
  }

  .stage {
    position: static;
  }

  .intro {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 30rem) {
  .masthead,
  main {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .top-nav a:nth-child(2),
  .top-nav a:nth-child(3) {
    display: none;
  }

  .split-control {
    grid-template-columns: minmax(0, 1fr) 3.2rem;
  }

  .split-control label {
    grid-column: 1 / -1;
  }

  .hud-value {
    font-size: 0.9rem;
  }

  .hud-unit {
    display: none;
  }

  .touch-wide svg {
    display: none;
  }

  .touch-btn {
    white-space: normal;
    line-height: 1.1;
    text-align: center;
    padding: 0 var(--space-2);
  }
}