/* ==========================================================================
   Tokens
   ========================================================================== */

:root {
  --bg: #0d0d0d;
  --text: #d9d9d9;
  --muted: #767676;
  --faint: #262626;
  --accent: #fb7b24;
  --shadow: rgba(0, 0, 0, 0.6);
  --focus: #fb7b24;

  --coin-size: clamp(150px, min(52vw, 32vh), 260px);
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, "Liberation Mono", monospace;

  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #ffffff;
    --text: #1f1f1f;
    --muted: #8f8f8f;
    --faint: #eeeeee;
    --accent: #fb7b24;
    --shadow: rgba(0, 0, 0, 0.14);
    --focus: #fb7b24;
    color-scheme: light;
  }
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --text: #1f1f1f;
  --muted: #8f8f8f;
  --faint: #eeeeee;
  --accent: #fb7b24;
  --shadow: rgba(0, 0, 0, 0.14);
  --focus: #fb7b24;
  color-scheme: light;
}

/* ==========================================================================
   Base
   ========================================================================== */

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

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0 auto;
  width: 100%;
  max-width: 600px;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: minmax(0, 1fr);
  padding: max(16px, env(safe-area-inset-top)) 20px max(20px, env(safe-area-inset-bottom));
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
  color: inherit;
}

p {
  margin: 0;
}

:focus-visible {
  outline: 1px dashed var(--focus);
  outline-offset: 4px;
}

.muted {
  color: var(--muted);
}

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

.link {
  padding: 4px 0;
  border: 0;
  background: none;
  color: var(--muted);
  cursor: default;
}

.link:hover {
  color: var(--text);
}

/* ==========================================================================
   Barra
   ========================================================================== */

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ==========================================================================
   Moneda
   ========================================================================== */

.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px 0 20px;
}

.arena {
  display: grid;
  place-items: center;
  perspective: 1000px;
}

.coin {
  position: relative;
  z-index: 1;
  width: var(--coin-size);
  height: var(--coin-size);
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  cursor: default;
  transform-style: preserve-3d;
  will-change: transform;
  touch-action: manipulation;
}

.coin:focus-visible {
  outline-offset: 10px;
  border-radius: 50%;
}

.coin__inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  will-change: transform;
}

.coin__face {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  user-select: none;
  -webkit-user-select: none;
  pointer-events: none;
}

.coin__face--tails {
  transform: rotateX(180deg);
}

/* Brillo sutil al pasar el mouse. El filtro va en cada cara y no en
   .coin__inner porque un filtro ahí aplanaría el 3D del giro. */
@media (hover: hover) and (pointer: fine) {
  .coin__face {
    transition: filter 0.2s ease;
  }

  .coin:hover:not([aria-busy="true"]) .coin__face {
    filter: brightness(1.1) saturate(1.05);
  }
}

.coin-shadow {
  width: calc(var(--coin-size) * 0.7);
  height: calc(var(--coin-size) * 0.08);
  margin-top: calc(var(--coin-size) * 0.07);
  border-radius: 50%;
  background: radial-gradient(closest-side, var(--shadow), transparent);
  will-change: transform, opacity;
}

/* ==========================================================================
   Resultado y ayuda
   ========================================================================== */

.result {
  min-height: 1.2em;
  /* compensa el espaciado de la última letra para que quede centrado */
  margin-right: -0.3em;
  white-space: nowrap;
  font-size: clamp(2rem, 9vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.3em;
}

.result .scramble {
  color: var(--muted);
}

.hint {
  font-size: 12px;
}

.hint--touch { display: none; }

@media (hover: none) and (pointer: coarse) {
  .hint--keys  { display: none; }
  .hint--touch { display: inline; }
}

/* ==========================================================================
   Stats + heatmap
   ========================================================================== */

.log {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 16px;
  border-top: 1px dashed var(--faint);
  font-size: 12px;
}

.line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  color: var(--muted);
}

.line .item {
  white-space: nowrap;
}

.line b {
  font-weight: 400;
  color: var(--text);
}

.line .sep {
  margin: 0 0.75ch;
  color: var(--muted);
  opacity: 0.5;
}

.line .history {
  white-space: normal;
  word-break: break-all;
  letter-spacing: 0.2ch;
  color: var(--accent);
}

.heatmap {
  --cols: 26;
  margin-top: 10px;
}

.heatmap__months,
.heatmap__grid {
  display: grid;
  grid-template-columns: repeat(var(--cols), 1fr);
  gap: 3px;
}

.heatmap__months {
  height: 1.6em;
  color: var(--muted);
  font-size: 11px;
}

.heatmap__months span {
  white-space: nowrap;
}

.heatmap__grid {
  grid-template-rows: repeat(7, auto);
  grid-auto-flow: column;
}

.heatmap__grid i,
.legend i {
  display: block;
  aspect-ratio: 1;
  border-radius: 2px;
  background: var(--faint);
}

.heatmap__grid i.is-future {
  visibility: hidden;
}

.heatmap__grid i.is-today {
  outline: 1px solid var(--muted);
  outline-offset: 1px;
}

.heatmap i[data-l="1"] { background: color-mix(in srgb, var(--accent) 30%, var(--faint)); }
.heatmap i[data-l="2"] { background: color-mix(in srgb, var(--accent) 55%, var(--faint)); }
.heatmap i[data-l="3"] { background: color-mix(in srgb, var(--accent) 80%, var(--faint)); }
.heatmap i[data-l="4"] { background: var(--accent); }

.heatmap__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 11px;
}

.legend {
  display: flex;
  align-items: center;
  gap: 3px;
}

.legend i {
  width: 10px;
}

.log > .link {
  align-self: flex-start;
  margin-top: 4px;
}

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