:root {
  color-scheme: dark;
  --ink: #ece7de;
  --soft: #c9c3b8;
  --muted: #989186;
  --paper: #151412;
  --line: #2b2823;
  --accent: #e0a458;
  --accent-bright: #e0a458;
  --accent-soft: rgb(224 164 88 / 10%);
  --error: #df806c;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--paper);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  font-weight: 500;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

button,
canvas {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

.page-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  border-bottom: 1px solid var(--line);
}

.header-left {
  display: flex;
  gap: 12px;
  align-items: center;
}

.back-home {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  min-height: 34px;
  padding: 0 10px;
  color: var(--soft);
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-decoration: none;
  transition:
    color 150ms ease,
    border-color 150ms ease,
    background 150ms ease;
}

.back-home:hover {
  color: var(--accent);
  background: rgb(236 231 222 / 3%);
  border-color: var(--accent);
}

.back-home:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.brand {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 1.15rem;
  line-height: 1;
}

.connection {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
}

.connection-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgb(224 164 88 / 10%);
}

.connection.is-online .connection-dot {
  background: #8aaf84;
  box-shadow: 0 0 0 4px rgb(138 175 132 / 10%);
}

.connection.is-offline .connection-dot {
  background: var(--error);
  box-shadow: 0 0 0 4px rgb(223 128 108 / 10%);
}

.panel-kicker {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h2,
p {
  margin-top: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.5rem, 3vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.recognizer {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(48px, 8vw, 96px);
  align-items: start;
  margin-top: 36px;
}

.drawing-panel,
.result-panel {
  min-width: 0;
}

.result-panel {
  display: flex;
  flex-direction: column;
}

.panel-heading {
  display: flex;
  gap: 24px;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 28px;
}

.panel-kicker {
  margin-bottom: 7px;
}

.canvas-frame {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(rgb(224 164 88 / 6%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(224 164 88 / 6%) 1px, transparent 1px),
    #fff;
  background-size: 28px 28px;
  border: 1px solid #3a3630;
  border-radius: 4px;
  aspect-ratio: 1;
}

#drawingCanvas {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  cursor: crosshair;
  touch-action: none;
}

#drawingCanvas:focus-visible {
  outline: 3px solid var(--accent-bright);
  outline-offset: -5px;
}

.canvas-hint {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 0;
  color: #aaa59c;
  font-family: inherit;
  font-size: clamp(3.5rem, 8vw, 6rem);
  font-weight: 700;
  transform: translate(-50%, -50%);
  transition: opacity 180ms ease;
  user-select: none;
}

.canvas-frame.has-drawing .canvas-hint {
  opacity: 0;
}

.canvas-actions {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 12px;
  margin-top: 18px;
}

.button {
  min-height: 54px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 0.87rem;
  font-weight: 700;
  cursor: pointer;
  transition:
    color 150ms ease,
    border-color 150ms ease,
    background 150ms ease;
}

.button:hover:not(:disabled) {
  color: var(--accent);
}

.button:focus-visible {
  outline: 3px solid var(--accent-bright);
  outline-offset: 2px;
}

.button:disabled {
  cursor: wait;
  opacity: 0.65;
}

.button-secondary {
  color: var(--ink);
  background: transparent;
  border-color: var(--line);
}

.button-secondary:hover:not(:disabled) {
  background: rgb(236 231 222 / 3%);
  border-color: var(--accent);
}

.button-primary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #1a1408;
  background: var(--accent);
}

.button-primary:hover:not(:disabled) {
  color: #1a1408;
  background: #edb66f;
}

.button-arrow {
  font-size: 1.15rem;
}

.prediction-hero {
  display: grid;
  gap: 12px;
  min-height: 235px;
  place-items: center;
  align-content: center;
  margin-bottom: 30px;
  color: var(--ink);
  text-align: center;
}

.prediction-label {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.prediction-digit {
  margin: 0;
  color: var(--accent-bright);
  font-family: inherit;
  font-size: 7.2rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 0.82;
}

.prediction-confidence {
  min-height: 1.4em;
  color: var(--soft);
  font-family: var(--mono);
  font-size: 0.83rem;
  line-height: 1.4;
}

.prediction-hero.is-rejected .prediction-digit {
  color: var(--error);
}

.prediction-hero.is-rejected .prediction-confidence {
  color: var(--error);
}

.choice-section {
  flex: 1;
}

.choice-heading {
  display: flex;
  justify-content: space-between;
  margin-bottom: 13px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.choice-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.choice-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) minmax(64px, auto);
  gap: 12px;
  align-items: center;
  min-height: 55px;
  padding: 0 2px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
}

.choice-row.is-top-choice {
  color: var(--ink);
  font-weight: 700;
}

.choice-row:last-child {
  border-bottom: 1px solid var(--line);
}

.choice-row.is-top-choice .choice-digit {
  color: var(--accent);
}

.choice-rank {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.choice-digit {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.choice-value {
  color: var(--muted);
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  white-space: nowrap;
}

.choice-placeholder {
  min-height: 55px;
  padding: 15px 2px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 0.76rem;
}

.result-message {
  min-height: 42px;
  margin: 24px 0 0;
  padding-top: 17px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.5;
}

.result-message:empty {
  display: none;
}

.result-message.is-error {
  color: var(--error);
}

footer {
  margin-top: 14px;
  padding: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
}

footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .canvas-actions {
    grid-template-columns: 0.8fr 1.2fr;
  }

  .button {
    padding-inline: 14px;
  }
}

@media (max-width: 760px) {
  .recognizer {
    grid-template-columns: 1fr;
    gap: 48px;
    margin-top: 32px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 24px, 520px);
  }

  .site-header {
    min-height: 70px;
  }

  .connection {
    max-width: 120px;
    justify-content: flex-end;
    text-align: right;
  }

  .header-left {
    gap: 10px;
  }

  .recognizer {
    margin-top: 28px;
    gap: 40px;
  }

  .panel-heading {
    align-items: start;
  }

  .canvas-actions {
    grid-template-columns: 1fr;
  }

  .prediction-hero {
    min-height: 210px;
  }

}

@media (max-width: 420px) {
  .back-home {
    width: 34px;
    justify-content: center;
    padding: 0;
  }

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

  .brand {
    gap: 6px;
    font-size: 0.92rem;
  }
}

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