:root {
  --paper: #e7e2d3;
  --paper-2: #f4efe0;
  --ink: #17160f;
  --muted: #5d584c;
  --rule: #c3bba6;
  --kk: #2f4a34;
  --ku: #2c4660;
  --uk: #7a5724;
  --uu: #7a2e22;
  --ok: #2f4a34;
  --err: #7a2e22;
  --focus: #2c4660;
  --shadow: 0 1px 0 rgba(23, 22, 15, 0.06), 0 18px 40px rgba(23, 22, 15, 0.08);
  --sans: "Segoe UI", system-ui, -apple-system, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Times New Roman", serif;
  --mono: "Cascadia Mono", "Segoe UI Mono", ui-monospace, Consolas, monospace;
}

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

html {
  color-scheme: light;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(23, 22, 15, 0.03), transparent 180px),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 27px,
      rgba(23, 22, 15, 0.025) 28px
    ),
    var(--paper);
}

.page {
  width: min(44rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.25rem 0 4rem;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.25rem;
  align-items: end;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--ink);
}

.kicker {
  margin: 0 0 0.35rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 2.7rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 0.95;
}

.lede {
  margin: 0.7rem 0 0;
  max-width: 28rem;
  color: var(--muted);
  line-height: 1.45;
}

.mark {
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 5.5rem;
  height: 5.5rem;
  border: 1px solid var(--ink);
  flex-shrink: 0;
}

.mark span {
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.mark .kk {
  color: var(--kk);
  background: #d7e3d6;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.mark .ku {
  color: var(--ku);
  background: #d4deea;
  border-bottom: 1px solid var(--ink);
}

.mark .uk {
  color: var(--uk);
  background: #eadcc4;
  border-right: 1px solid var(--ink);
}

.mark .uu {
  color: var(--uu);
  background: #ead4cf;
}

.legend {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem 1rem;
  margin: 1.15rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  color: var(--muted);
}

.legend b {
  font-weight: 700;
  letter-spacing: 0.04em;
}

.legend .kk b { color: var(--kk); }
.legend .ku b { color: var(--ku); }
.legend .uk b { color: var(--uk); }
.legend .uu b { color: var(--uu); }

form,
.output-panel {
  margin-top: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.optional {
  letter-spacing: 0;
  text-transform: none;
  color: var(--muted);
}

.hint {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

input[type="text"],
textarea {
  width: 100%;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  color: var(--ink);
  font: inherit;
  border-radius: 0;
}

input[type="text"] {
  padding: 0.7rem 0.8rem;
}

textarea {
  padding: 0.85rem 0.9rem;
  resize: vertical;
  line-height: 1.45;
}

#raw-input {
  min-height: 12.5rem;
  font-size: 1rem;
}

#compiled-output {
  min-height: 22rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.45;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  tab-size: 2;
}

::placeholder {
  color: var(--muted);
  opacity: 0.75;
  font-style: italic;
}

input:focus-visible,
textarea:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.9rem;
}

.kbd {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}

button {
  appearance: none;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  padding: 0.65rem 0.95rem;
  cursor: pointer;
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#compile-btn {
  background: var(--ink);
  color: var(--paper-2);
}

#compile-btn:hover:not(:disabled),
.ghost:hover:not(:disabled) {
  transform: translateY(-1px);
}

.output-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.55rem;
}

.actions {
  display: flex;
  gap: 0.45rem;
}

.status {
  min-height: 1.3rem;
  margin: 0.85rem 0 0;
  font-size: 0.9rem;
}

.status[data-kind="ok"] {
  color: var(--ok);
}

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

.output-panel {
  padding: 1rem 0 0;
  border-top: 1px solid var(--rule);
}

.note {
  margin: 2rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.note code {
  font-family: var(--mono);
  font-size: 0.78em;
}

@media (max-width: 640px) {
  .masthead {
    grid-template-columns: 1fr auto;
    align-items: start;
  }

  .lede {
    grid-column: 1 / -1;
  }

  .legend {
    grid-template-columns: 1fr;
  }

  #raw-input {
    min-height: 8.5rem;
  }

  #compiled-output {
    min-height: 18rem;
  }
}

@media print {
  body {
    background: white;
  }

  form,
  .legend,
  .note,
  .actions,
  #compile-btn,
  .status,
  .kbd {
    display: none !important;
  }

  .output-panel {
    border: 0;
    margin: 0;
  }

  #compiled-output {
    border: 0;
    min-height: 0;
  }
}