:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --text: #1c2330;
  --muted: #5d6778;
  --border: #d9dee7;
  --accent: #2563eb;
  --code-bg: #eef1f6;
  --ok: #157f3c;
  --ok-bg: #e7f6ec;
  --warn: #9a5b00;
  --warn-bg: #fff4de;
  --bad: #b42318;
  --bad-bg: #fdecea;
  --mark: #ffe08a;
  --ws: #9aa4b5;
  --add: #e6f6ea;
  --del: #fdecec;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1318;
    --panel: #171c23;
    --text: #e3e8ef;
    --muted: #97a1b2;
    --border: #2b323d;
    --accent: #6ea0ff;
    --code-bg: #212833;
    --ok: #5fd08a;
    --ok-bg: #12291c;
    --warn: #f2b54a;
    --warn-bg: #2d2413;
    --bad: #ff7a70;
    --bad-bg: #331714;
    --mark: #6b5310;
    --ws: #5c6677;
    --add: #13291b;
    --del: #331818;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

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

a { color: var(--accent); }
code, pre, textarea { font-family: var(--mono); font-size: 13px; }
code { background: var(--code-bg); padding: 0.05em 0.35em; border-radius: 4px; }
button, select, input { font: inherit; color: inherit; }

.top {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: flex-end;
  justify-content: space-between;
  padding: 16px 24px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.top h1 { margin: 0; font-size: 20px; letter-spacing: -0.01em; }
.top h1 span { color: var(--muted); font-weight: 400; }
.top p { margin: 2px 0 0; color: var(--muted); max-width: 70ch; }
.top nav { display: flex; gap: 16px; }

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  padding: 16px 24px 24px;
  align-items: start;
}

.editor-pane, .result-pane {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  min-width: 0;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  margin-bottom: 10px;
}
.toolbar label { display: inline-flex; gap: 6px; align-items: center; color: var(--muted); max-width: 100%; min-width: 0; }
.toolbar label select { min-width: 0; text-overflow: ellipsis; }
.toolbar select, .file-name input {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 6px;
  color: var(--text);
  max-width: 100%;
}
.toggles { display: inline-flex; gap: 10px; }
.spacer { flex: 1; }

button {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: 0.5; cursor: default; }
button:focus-visible, select:focus-visible, input:focus-visible, textarea:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.file-name { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; color: var(--muted); }
.file-name input { font-family: var(--mono); font-size: 13px; width: 16em; }
.note { color: var(--warn); font-size: 13px; }
.note.bad { color: var(--bad); }

.editor {
  display: grid;
  grid-template-columns: auto 1fr;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  height: min(62vh, 640px);
  min-height: 260px;
}
.gutter {
  margin: 0;
  padding: 10px 8px 10px 12px;
  text-align: right;
  color: var(--muted);
  background: var(--code-bg);
  overflow: hidden;
  line-height: 20px;
  user-select: none;
}
textarea {
  border: 0;
  resize: none;
  padding: 10px 12px;
  line-height: 20px;
  background: var(--panel);
  color: var(--text);
  tab-size: 4;
  white-space: pre;
  overflow: auto;
  width: 100%;
}
textarea:focus-visible { outline-offset: -2px; }

.privacy { color: var(--muted); font-size: 13px; margin: 10px 2px 0; }

.verdict {
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 10px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.verdict strong { font-size: 16px; }
.verdict span { color: var(--muted); }
.verdict.ok { background: var(--ok-bg); border-color: transparent; }
.verdict.ok strong { color: var(--ok); }
.verdict.warn { background: var(--warn-bg); border-color: transparent; }
.verdict.warn strong { color: var(--warn); }
.verdict.bad { background: var(--bad-bg); border-color: transparent; }
.verdict.bad strong { color: var(--bad); }
.verdict .notice { color: var(--warn); }

.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.tabs button {
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 6px 10px;
  color: var(--muted);
  background: none;
}
.tabs button[aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); font-weight: 600; }
.count:not(:empty) {
  background: var(--code-bg);
  border-radius: 999px;
  padding: 0 7px;
  font-size: 12px;
  margin-left: 2px;
}
.panel { padding-top: 10px; max-height: calc(62vh + 40px); overflow: auto; }
.empty { color: var(--muted); }

.diags { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.diag { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; }
.d-head { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.d-head a { font-family: var(--mono); font-weight: 600; text-decoration: none; }
.rule-name { color: var(--muted); font-family: var(--mono); font-size: 13px; }
.loc { margin-left: auto; font-size: 13px; padding: 1px 8px; }
.sev { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; border-radius: 4px; padding: 0 6px; }
.sev.error { color: var(--bad); background: var(--bad-bg); }
.sev.warning { color: var(--warn); background: var(--warn-bg); }
.sev.info { color: var(--accent); background: var(--code-bg); }
.msg { margin: 6px 0 2px; }
.consequence { margin: 2px 0 6px; color: var(--muted); }
.fix { margin: 6px 0 0; font-size: 13px; }
.fix.safe { color: var(--ok); }
.fix.unsafe { color: var(--warn); }

.excerpt {
  margin: 6px 0 0;
  padding: 6px 8px;
  background: var(--code-bg);
  border-radius: 6px;
  overflow-x: auto;
}
.excerpt .lno { color: var(--muted); }
.excerpt .ws { color: var(--ws); }
.excerpt .inv { color: var(--bad); font-weight: 600; }
.excerpt mark { background: var(--mark); color: inherit; border-radius: 2px; }
.excerpt mark .ws { color: var(--text); }
.excerpt .caret { color: var(--bad); font-weight: 700; }

.fix-bar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 8px; }
.hint { color: var(--muted); font-size: 13px; }
.diff {
  margin: 0;
  padding: 8px 0;
  background: var(--code-bg);
  border-radius: 6px;
  overflow-x: auto;
  min-height: 3em;
}
.diff span { display: block; padding: 0 10px; white-space: pre; }
.diff .add { background: var(--add); }
.diff .del { background: var(--del); }
.diff .hunk { color: var(--accent); }
.diff .meta { color: var(--muted); }
.diff .empty { white-space: normal; }

.panel h3 { font-size: 15px; margin: 16px 0 6px; }
.panel h4 { font-size: 14px; margin: 14px 0 4px; font-weight: 600; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { text-align: left; padding: 4px 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
td code { white-space: pre-wrap; word-break: break-all; }
td .ok { color: var(--ok); }
td .bad { color: var(--bad); }

.copyable { display: flex; gap: 8px; align-items: flex-start; }
.copyable pre { flex: 1; margin: 0; padding: 8px 10px; background: var(--code-bg); border-radius: 6px; overflow-x: auto; }
.muted { color: var(--muted); font-size: 13px; }

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 8px 14px;
  border-radius: 8px;
  max-width: calc(100vw - 32px);
}

@media (max-width: 900px) {
  main { grid-template-columns: minmax(0, 1fr); padding: 12px 16px 16px; }
  .top { padding: 12px 16px; }
  .editor { height: 50vh; }
  .panel { max-height: none; }
}