:root {
  --bg: #f7f9fc;
  --panel: #ffffff;
  --text: #13233a;
  --muted: #5b6b80;
  --border: #dbe2ec;
  --accent: #0e9f83;
  --brand: #0b2545;
  --sel: #cfe8ff;
  --err: #d33a3a;
  --warn: #c98a00;
  --kw: #8a3ffc;
  --str: #0b7a3e;
  --num: #b5530a;
  --type: #1f6fd1;
  --fn: #7a5a00;
  --field: #0b5f8a;
  --comment: #7b8794;
  --const: #c0267a;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1422;
    --panel: #0f1b2d;
    --text: #dbe5f1;
    --muted: #8a9bb0;
    --border: #22324a;
    --accent: #35ebc6;
    --brand: #dbe5f1;
    --sel: #1f3b5e;
    --err: #ff6b6b;
    --warn: #f0b429;
    --kw: #c39bff;
    --str: #7ee2a8;
    --num: #ffb37a;
    --type: #7cb8ff;
    --fn: #f3d27a;
    --field: #8fd3ff;
    --comment: #6c7d93;
    --const: #ff8ac4;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body { height: 100%; margin: 0; }

body {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 var(--sans);
}

button, select, input { font: inherit; color: inherit; }

button, select {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}

button:hover, select:hover { border-color: var(--accent); }

.bar {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--brand);
  font-weight: 700;
  font-size: 17px;
  text-decoration: none;
}

.tag {
  font-weight: 500;
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 8px;
}

.field { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13px; }
.spacer { flex: 1; }
.status { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
.link { color: var(--muted); text-decoration: none; font-size: 13px; }
.link:hover { color: var(--accent); }

.panes {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
}

.pane { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.source { border-right: 1px solid var(--border); }

.tabs {
  display: flex;
  gap: 2px;
  padding: 6px 8px 0;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  overflow-x: auto;
}

.tabs button {
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  background: none;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12.5px;
  white-space: nowrap;
}

.tabs button[aria-selected="true"] {
  background: var(--bg);
  border-color: var(--border);
  color: var(--text);
}

.tabs .main::after { content: " ●"; color: var(--accent); font-size: 9px; vertical-align: middle; }

/* The editor: a textarea over highlighted text, both with the same metrics. */
.editor {
  --line: 20px;
  flex: 1;
  min-height: 0;
  display: flex;
  position: relative;
  font: 13.5px/var(--line) var(--mono);
  tab-size: 2;
}

.gutter {
  width: 46px;
  flex: none;
  overflow: hidden;
  padding: 10px 10px 10px 0;
  text-align: right;
  color: var(--comment);
  user-select: none;
  border-right: 1px solid var(--border);
}

.gutter div { white-space: pre; }
.code { position: relative; flex: 1; min-width: 0; }

.layer, .code textarea {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 10px 14px;
  border: 0;
  font: inherit;
  white-space: pre;
  overflow: hidden;
  tab-size: inherit;
}

.code textarea {
  overflow: auto;
  resize: none;
  outline: none;
  background: transparent;
  color: transparent;
  caret-color: var(--text);
}

.code textarea::selection { background: var(--sel); color: transparent; }
.marks { color: transparent; pointer-events: none; }
.marks mark { background: none; color: transparent; text-decoration: underline wavy var(--err); text-decoration-skip-ink: none; text-underline-offset: 3px; }
.marks mark.warn { text-decoration-color: var(--warn); }
.measure { position: absolute; visibility: hidden; white-space: pre; font: inherit; }

.t-kw { color: var(--kw); }
.t-str { color: var(--str); }
.t-num { color: var(--num); }
.t-type { color: var(--type); }
.t-fn { color: var(--fn); }
.t-field { color: var(--field); }
.t-com { color: var(--comment); font-style: italic; }
.t-const { color: var(--const); }

.problems {
  max-height: 28%;
  overflow: auto;
  border-top: 1px solid var(--border);
  background: var(--panel);
  font-size: 13px;
}

.problems:empty { display: none; }

.problem {
  display: flex;
  gap: 10px;
  width: 100%;
  padding: 6px 14px;
  border: 0;
  border-radius: 0;
  border-bottom: 1px solid var(--border);
  background: none;
  text-align: left;
  font-family: var(--mono);
  font-size: 12.5px;
}

.problem:hover { background: var(--bg); }
.problem .sev { flex: none; font-weight: 700; }
.problem.error .sev { color: var(--err); }
.problem.warn .sev { color: var(--warn); }
.problem .at { flex: none; color: var(--muted); }
.problem .msg { white-space: pre-wrap; }

.result { background: var(--panel); }
.result h2 { margin: 0; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.inputs { padding: 12px 16px; border-bottom: 1px solid var(--border); }
.inputs:has(#inputs:empty) { display: none; }
#inputs { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 6px 12px; margin-top: 10px; align-items: center; }
#inputs label { font-family: var(--mono); font-size: 13px; }
#inputs label small { display: block; color: var(--muted); font-size: 11.5px; max-width: 22em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

#inputs input {
  width: 100%;
  padding: 5px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  font-family: var(--mono);
  font-size: 13px;
}

#inputs input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.output-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px 0; }

.output {
  flex: 1;
  min-height: 0;
  margin: 0;
  padding: 10px 16px 16px;
  overflow: auto;
  font: 13px/1.5 var(--mono);
}

.output.stale { opacity: .45; }
.output .k { color: var(--field); }
.output .doc { color: var(--comment); }

.tip, .complete {
  position: fixed;
  z-index: 10;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, .18);
}

.tip { max-width: min(560px, 90vw); padding: 8px 10px; font-size: 13px; pointer-events: none; }
.tip pre { margin: 0; font: 12.5px/1.45 var(--mono); white-space: pre-wrap; }
.tip .doc { margin-top: 6px; padding-top: 6px; border-top: 1px solid var(--border); color: var(--muted); white-space: pre-wrap; }
.tip .doc code { font-family: var(--mono); font-size: 12px; }
.tip.error pre { color: var(--err); }

.complete { display: flex; max-width: min(720px, 95vw); max-height: 260px; overflow: hidden; font: 12.5px/1.5 var(--mono); }
.complete ul { margin: 0; padding: 4px 0; list-style: none; overflow: auto; min-width: 220px; }
.complete li { display: flex; gap: 8px; padding: 1px 10px; cursor: pointer; white-space: nowrap; }
.complete li[aria-selected="true"] { background: var(--sel); }
.complete li .kind { width: 1.2em; color: var(--muted); text-align: center; }
.complete li .detail { margin-left: auto; padding-left: 16px; color: var(--muted); max-width: 22em; overflow: hidden; text-overflow: ellipsis; }
.complete li.preferred .label { font-weight: 700; }
.complete-doc { width: 300px; padding: 6px 10px; border-left: 1px solid var(--border); overflow: auto; font-family: var(--sans); font-size: 12.5px; color: var(--muted); white-space: pre-wrap; }
.complete-doc:empty { display: none; }

@media (max-width: 900px) {
  .panes { grid-template-columns: 1fr; grid-template-rows: minmax(360px, 60vh) auto; overflow: auto; }
  .source { border-right: 0; border-bottom: 1px solid var(--border); }
  .output { min-height: 240px; }
  .complete-doc { display: none; }
}

.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 7px; overflow: hidden; }
.seg button { border: 0; border-radius: 0; padding: 3px 12px; background: none; color: var(--muted); font-size: 13px; }
.seg button + button { border-left: 1px solid var(--border); }
.seg button[aria-selected="true"] { background: var(--accent); color: #fff; }
.output-head .spacer { flex: 1; }
.output-head { gap: 8px; padding-bottom: 6px; }
.resview { flex: 1; min-height: 0; width: 100%; border: 0; border-top: 1px solid var(--border); background: var(--bg); }
@media (prefers-color-scheme: dark) { .seg button[aria-selected="true"] { color: #0b1422; } }
@media (max-width: 900px) { .resview { min-height: 520px; } }