:root {
  --bg: #f8f9fc;
  --surface: #ffffff;
  --text: #132036;
  --muted: #60708a;
  --border: #d2d9e4;
  --focus: #005ed8;
  --error-bg: #ffe9e8;
  --error-border: #f4aaa8;
  --error-text: #8d1f1f;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fbfcff 0%, #eff3fa 100%);
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
}

.toolbar,
.editors article {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
}

.toolbar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, auto));
  gap: 0.6rem;
  align-items: end;
}

label {
  font-weight: 700;
}

textarea,
select,
button {
  font: inherit;
}

textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.7rem;
  font-family: Consolas, "Courier New", monospace;
}

select,
button {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.5rem 0.65rem;
  background: #fff;
}

button {
  cursor: pointer;
}

button:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.editors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.error {
  min-height: 1.2rem;
  margin: 0;
  border-radius: 8px;
  padding: 0.4rem 0.6rem;
}

.error.active {
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-text);
}

#message {
  min-height: 1.2rem;
  margin: 0;
  color: var(--muted);
}

@media (max-width: 900px) {
  .editors {
    grid-template-columns: 1fr;
  }
}