:root {
  color-scheme: light;
  --bg: #f7f3ee;
  --surface: #ffffff;
  --surface-2: #fbf8f4;
  --text: #1f1a17;
  --muted: #6f655d;
  --border: #e6ddd3;
  --accent: #c0262d;
  --accent-text: #ffffff;
  --error: #b42318;
  --error-bg: #fdecea;
  --selection: rgba(192, 38, 45, 0.18);

  --syn-control: #c0262d;
  --syn-decl: #7a3db8;
  --syn-builtin: #0b7a75;
  --syn-constant: #b45309;
  --syn-string: #2f7d32;
  --syn-number: #b45309;
  --syn-comment: #8a817a;
  --syn-function: #1d5fbf;

  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #15120f;
    --surface: #1e1a16;
    --surface-2: #231e19;
    --text: #ede6dd;
    --muted: #a39a90;
    --border: #3a332c;
    --accent: #ff5a5f;
    --accent-text: #1b0d0e;
    --error: #ff8a80;
    --error-bg: #3a1714;
    --selection: rgba(255, 90, 95, 0.25);

    --syn-control: #ff6b6f;
    --syn-decl: #c39bff;
    --syn-builtin: #4fd1c5;
    --syn-constant: #f6ad55;
    --syn-string: #8bd17c;
    --syn-number: #f6ad55;
    --syn-comment: #8a8178;
    --syn-function: #7ab7ff;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
}

a {
  color: var(--accent);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Top bar */

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-tag {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

select,
.button {
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 14px;
}

select {
  padding: 0 8px;
}

.button {
  padding: 0 14px;
  cursor: pointer;
}

.button:hover {
  border-color: var(--muted);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}

.button.primary:hover {
  filter: brightness(1.08);
}

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

/* Panels */

.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px;
}

@media (max-width: 860px) {
  .workspace {
    grid-template-columns: 1fr;
  }
}

.panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: min(68vh, 620px);
  min-height: 320px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 42px;
  padding: 0 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.panel-title {
  font-family: var(--mono);
  font-size: 13px;
}

.hint {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
}

.tab {
  height: 42px;
  padding: 0 10px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.tab[aria-selected="true"] {
  border-bottom-color: var(--accent);
  color: var(--text);
  font-weight: 600;
}

.status {
  margin-left: auto;
  color: var(--muted);
  font-size: 12px;
}

/* Editor: a transparent textarea on top of a highlighted copy of the code */

.editor {
  display: flex;
  flex: 1;
  min-height: 0;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
}

.gutter {
  flex: none;
  min-width: 44px;
  padding: 12px 10px 12px 8px;
  overflow: hidden;
  border-right: 1px solid var(--border);
  color: var(--muted);
  text-align: right;
  white-space: pre;
  user-select: none;
}

.gutter .error-line {
  color: var(--error);
  font-weight: 700;
}

.code {
  position: relative;
  flex: 1;
  min-width: 0;
}

.highlight,
.code textarea {
  margin: 0;
  padding: 12px;
  border: 0;
  font: inherit;
  letter-spacing: 0;
  white-space: pre;
  tab-size: 2;
  overflow-wrap: normal;
}

.highlight {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.code textarea {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  resize: none;
  overflow: auto;
  background: transparent;
  color: transparent;
  caret-color: var(--text);
  outline: none;
}

.code textarea::selection {
  background: var(--selection);
  color: transparent;
}

.syn-control { color: var(--syn-control); font-weight: 600; }
.syn-decl { color: var(--syn-decl); font-weight: 600; }
.syn-builtin { color: var(--syn-builtin); font-weight: 600; }
.syn-constant { color: var(--syn-constant); }
.syn-string { color: var(--syn-string); }
.syn-number { color: var(--syn-number); }
.syn-comment { color: var(--syn-comment); font-style: italic; }
.syn-function { color: var(--syn-function); }

/* Output */

.result {
  flex: 1;
  min-height: 0;
  margin: 0;
  padding: 12px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
  white-space: pre;
}

.result .lines {
  display: block;
}

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

.result .error {
  display: block;
  margin-top: 4px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--error-bg);
  color: var(--error);
}

/* Keyword reference */

.reference {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.reference h2 {
  margin: 0 0 12px;
  font-size: 15px;
}

.keywords {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 8px;
  margin: 0;
}

.keywords div {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  font-family: var(--mono);
  font-size: 13px;
}

.keywords dt {
  font-weight: 600;
}

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

.footnote {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
}