:root {
  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface-sunk: #fbfaf7;
  --border: #e2dfd6;
  --text: #1d1c1a;
  --muted: #6b675f;
  --accent: #1f7a5a;
  --accent-hover: #186148;
  --on-accent: #ffffff;
  --danger: #b3261e;
  --score-bg-l: 92%;
  --score-fg-l: 26%;
  --score-sat: 62%;
  --shadow: 0 1px 2px rgb(30 28 24 / 0.05), 0 4px 16px rgb(30 28 24 / 0.04);
  --radius: 14px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141412;
    --surface: #1d1d1a;
    --surface-sunk: #191917;
    --border: #34332e;
    --text: #ecebe6;
    --muted: #a19d93;
    --accent: #4cc293;
    --accent-hover: #6ad3a8;
    --on-accent: #0d2a1f;
    --danger: #f2b8b5;
    --score-bg-l: 20%;
    --score-fg-l: 76%;
    --score-sat: 45%;
    --shadow: none;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}

.top,
main,
.bottom {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-inline: 16px;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 20px 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand img {
  display: block;
}

.tagline {
  margin: 0;
  color: var(--muted);
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 12px;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.levels {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}

.levels label {
  position: relative;
}

.levels input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
  cursor: pointer;
}

.levels span {
  display: block;
  padding: 6px 16px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.9375rem;
  transition:
    background 0.15s,
    color 0.15s;
}

.levels input:hover + span {
  color: var(--text);
}

.levels input:checked + span {
  background: var(--accent);
  color: var(--on-accent);
}

.levels input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.run {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 40px;
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: var(--on-accent);
  font: inherit;
  font-weight: 650;
  cursor: pointer;
  transition: background 0.15s;
}

.run:hover:not(:disabled) {
  background: var(--accent-hover);
}

.run:focus-visible,
.copy:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.run:disabled {
  cursor: progress;
  opacity: 0.75;
}

.run-keys {
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  opacity: 0.75;
}

.run-keys:empty {
  display: none;
}

.panes {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: stretch;
  gap: 10px;
  min-height: 420px;
}

.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.pane:focus-within {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
}

.pane-head,
.pane-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px 10px 16px;
}

.pane-head {
  min-height: 52px;
  border-bottom: 1px solid var(--border);
}

.pane-foot {
  height: 50px;
  border-top: 1px solid var(--border);
  background: var(--surface-sunk);
  font-size: 0.875rem;
  color: var(--muted);
}

.pane h2 {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 650;
}

textarea {
  flex: 1;
  width: 100%;
  min-height: 0;
  padding: 14px 16px;
  border: 0;
  resize: none;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  line-height: 1.6;
}

textarea:focus {
  outline: none;
}

textarea::placeholder {
  color: var(--muted);
  opacity: 0.8;
}

textarea[aria-busy="true"] {
  cursor: progress;
}

.arrow {
  display: grid;
  place-items: center;
  color: var(--muted);
}

.score {
  --hue: 0;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  min-height: 30px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--surface-sunk);
  border: 1px solid var(--border);
  font-size: 0.8125rem;
  white-space: nowrap;
  transition:
    background 0.25s,
    color 0.25s;
}

.score-label {
  color: inherit;
  opacity: 0.8;
}

.score-value {
  font-size: 1rem;
  font-weight: 750;
  font-variant-numeric: tabular-nums;
  min-width: 2ch;
  text-align: right;
}

.score[data-state="empty"],
.score[data-state="failed"] {
  color: var(--muted);
}

.score[data-state="ready"] {
  border-color: transparent;
  background: hsl(var(--hue) var(--score-sat) var(--score-bg-l));
  color: hsl(var(--hue) var(--score-sat) var(--score-fg-l));
}

.score[data-state="loading"] .score-value {
  animation: pulse 1s ease-in-out infinite;
}

.score-gain {
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

@keyframes pulse {
  50% {
    opacity: 0.3;
  }
}

.count[data-over] {
  color: var(--danger);
  font-weight: 600;
}

.status[data-tone="error"] {
  color: var(--danger);
}

.copy {
  height: 30px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}

.copy:hover:not(:disabled) {
  border-color: var(--muted);
}

.copy:disabled {
  color: var(--muted);
  cursor: default;
  opacity: 0.6;
}

.bottom {
  padding-block: 4px 20px;
  color: var(--muted);
  font-size: 0.8125rem;
  text-align: center;
}

@media (max-width: 760px) {
  .top {
    flex-direction: column;
    text-align: center;
    gap: 2px;
    padding-block: 16px 8px;
  }

  .tagline {
    font-size: 0.9375rem;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .levels {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    text-align: center;
  }

  .run {
    justify-content: center;
    height: 44px;
  }

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

  .pane textarea {
    min-height: max(200px, 32dvh);
  }

  .arrow svg {
    transform: rotate(90deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}