*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:         #f5f5f3;
  --surface:    #ffffff;
  --border:     #d4d4d0;
  --accent:     #1a1a1a;
  --muted:      #6b6b6b;
  --error:      #c0392b;
  --ok:         #27ae60;
  --warn:       #e67e22;
  --info:       #2980b9;
  --fix-bg:     #fef9f0;
  --fix-border: #e8c97a;
  --yaml:       #0b7285;
  --json:       #b25c00;
  --mono:       "JetBrains Mono", "Fira Mono", "Consolas", monospace;
  --sans:       "Inter", "Helvetica Neue", Arial, sans-serif;
  --radius:     3px;
}

html, body { height: 100%; background: var(--bg); color: var(--accent);
  font-family: var(--sans); font-size: 14px; line-height: 1.5; }

.app { display: flex; flex-direction: column; height: 100vh; max-width: 1800px; margin: 0 auto; }

header {
  display: flex; align-items: baseline; gap: 12px;
  padding: 11px 16px; border-bottom: 1px solid var(--border);
  background: var(--surface); flex-shrink: 0;
}
header h1 { font-size: 14px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }
header .sub { font-size: 11px; color: var(--muted); }
header .grammar-tag {
  margin-left: auto; font-size: 11px; font-family: var(--mono);
  color: var(--info); background: linear-gradient(120deg, #eaf4fc, #fff7e6);
  padding: 2px 7px; border-radius: 2px; border: 1px solid #b8d8f0;
}

.toolbar {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-bottom: 1px solid var(--border);
  background: var(--surface); flex-shrink: 0; flex-wrap: wrap;
}
.toolbar label { font-size: 12px; color: var(--muted); white-space: nowrap; }
.toolbar select {
  font-family: var(--sans); font-size: 13px; padding: 4px 8px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg); color: var(--accent); cursor: pointer;
  min-width: 140px;
}
.toolbar #example-select { flex: 1; max-width: 420px; }
.toolbar select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.meta-pill {
  font-size: 10px; font-weight: 600; letter-spacing: .04em;
  text-transform: uppercase; padding: 3px 8px; border-radius: 999px;
  background: #eceae4; color: var(--muted); border: 1px solid var(--border);
}
.meta-pill.format-yaml { color: var(--yaml); border-color: #a8d7de; background: #edf9fb; }
.meta-pill.format-json { color: var(--json); border-color: #f2d39d; background: #fff5e7; }

.status-badge {
  margin-left: auto; font-size: 11px; font-weight: 600;
  letter-spacing: .05em; text-transform: uppercase;
  padding: 3px 8px; border-radius: 2px; white-space: nowrap;
}
.status-badge.clean  { background: #d4edda; color: var(--ok); }
.status-badge.errors { background: #fde8e8; color: var(--error); }
.status-badge.lint   { background: #fff3cd; color: var(--warn); }
.status-badge.idle   { background: #ebebeb; color: var(--muted); }

.panels { display: grid; grid-template-columns: 1fr 1.1fr 1fr; flex: 1; overflow: hidden; }

.panel { display: flex; flex-direction: column; border-right: 1px solid var(--border); overflow: hidden; min-width: 0; }
.panel:last-child { border-right: none; }

.panel-header {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 12px; background: var(--surface);
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.panel-header h2 {
  font-size: 10px; font-weight: 700; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted);
}
.badge {
  font-size: 10px; font-weight: 600; padding: 2px 6px;
  border-radius: 2px; background: #ebebeb; color: var(--muted);
}
.badge.has-errors { background: #fde8e8; color: var(--error); }
.badge.no-errors  { background: #d4edda; color: var(--ok); }
.badge.has-lint   { background: #fff3cd; color: var(--warn); }
.badge.badge-format { background: #eef1f4; color: #45525f; }
.badge.badge-quiet { background: #eef1f4; color: #5e6b76; }

.panel-body { flex: 1; overflow: auto; position: relative; }

#editor {
  width: 100%; height: 100%; padding: 12px;
  font-family: var(--mono); font-size: 13px; line-height: 1.65;
  border: none; outline: none; resize: none;
  background: var(--surface); color: var(--accent); tab-size: 2;
}

#tree-output {
  padding: 10px 12px; font-family: var(--mono); font-size: 11.5px;
  line-height: 1.65; white-space: pre; background: var(--surface);
  min-height: 100%; overflow-x: auto;
}
.tn-error   { color: var(--error); font-weight: 700; }
.tn-missing { color: var(--warn);  font-weight: 700; }
.tn-node    { color: #2c7bb6; }
.tn-field   { color: #7b5ea7; }
.tn-paren   { color: #aaa; }
.tn-string  { color: #888; font-style: italic; }

.issues-section {
  border-top: 1px solid var(--border); background: #fff8f8;
  flex-shrink: 0; max-height: 200px; overflow-y: auto;
}
.issues-section.lint-only { background: #fffdf0; }
.issues-section h3 {
  font-size: 10px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
  padding: 6px 12px 4px; border-bottom: 1px solid #f0d0d0;
  position: sticky; top: 0; background: inherit;
}
.issues-section.lint-only h3 { border-bottom-color: #e8d88a; }
.issue-item {
  padding: 4px 12px; border-bottom: 1px solid #f0d0d0;
  font-size: 11.5px; font-family: var(--mono);
}
.issues-section.lint-only .issue-item { border-bottom-color: #e8d88a; }
.issue-item:last-child { border-bottom: none; }
.issue-item .loc { color: var(--muted); font-size: 10px; margin-right: 5px; }
.type-tag {
  display: inline-block; font-size: 9px; font-weight: 700;
  letter-spacing: .05em; text-transform: uppercase;
  padding: 1px 4px; border-radius: 2px; margin-right: 5px;
}
.type-tag.error   { background: #fde8e8; color: var(--error); }
.type-tag.missing { background: #fff3cd; color: var(--warn); }
.type-tag.lint    { background: #e8f4fd; color: var(--info); }
.lint-rule { background: #e8f4fd; color: #1a6ea8; }

.sanitized-panel-body { display: flex; flex-direction: column; height: 100%; overflow: hidden; }
#sanitized-output {
  flex: 1; padding: 12px; font-family: var(--mono); font-size: 13px;
  line-height: 1.65; white-space: pre-wrap; word-break: break-all;
  background: var(--surface); overflow: auto;
}

.fixes-section {
  border-top: 1px solid var(--border); background: var(--fix-bg);
  flex-shrink: 0; max-height: 240px; overflow-y: auto;
}
.fixes-section h3 {
  font-size: 10px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted);
  padding: 6px 12px 4px; border-bottom: 1px solid var(--fix-border);
  position: sticky; top: 0; background: var(--fix-bg);
}
.fix-item { padding: 6px 12px; border-bottom: 1px solid var(--fix-border); font-size: 12px; }
.fix-item:last-child { border-bottom: none; }
.fix-rule {
  display: inline-block; font-size: 9px; font-weight: 700;
  letter-spacing: .05em; text-transform: uppercase;
  background: var(--fix-border); color: #7a5c00;
  padding: 1px 5px; border-radius: 2px; margin-right: 6px;
  font-family: var(--mono);
}
.fix-desc { color: var(--accent); font-size: 12px; }
.fix-diff { margin-top: 5px; display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.fix-before, .fix-after {
  font-family: var(--mono); font-size: 11px; padding: 3px 6px;
  border-radius: 2px; white-space: pre-wrap; word-break: break-all;
}
.fix-before { background: #fde8e8; color: var(--error); }
.fix-after  { background: #d4edda; color: var(--ok); }

.spinner {
  display: inline-block; width: 10px; height: 10px;
  border: 2px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin .6s linear infinite;
  margin-left: 4px; vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }
.spinner.hidden { display: none; }

.empty { padding: 24px 12px; color: var(--muted); font-size: 12px; text-align: center; font-family: var(--sans); }

.btn {
  font-family: var(--sans); font-size: 10px; font-weight: 600;
  letter-spacing: .05em; text-transform: uppercase;
  padding: 3px 8px; border: 1px solid var(--border);
  border-radius: var(--radius); background: var(--bg);
  color: var(--muted); cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
  white-space: nowrap;
}
.btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.active { background: #d4edda; color: var(--ok); border-color: var(--ok); }
.btn.copied { background: var(--ok); color: #fff; border-color: var(--ok); }

@media (max-width: 960px) {
  .panels { grid-template-columns: 1fr; overflow: auto; }
  .panel { border-right: none; border-bottom: 1px solid var(--border); min-height: 300px; max-height: 60vh; }
  .panel:last-child { border-bottom: none; }
  .toolbar { align-items: stretch; }
  .toolbar label { width: 100%; }
  .toolbar select, .toolbar #example-select { max-width: none; width: 100%; }
  .meta-pill, .status-badge { margin-left: 0; }
}