:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --border: #d9dde3;
  --panel-bg: #f7f8fa;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --hover: #eef2ff;
  --mark-bg: #fde68a;
  --mark-fg: #1a1a1a;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #17181c;
    --fg: #e6e6e6;
    --muted: #9aa1ac;
    --border: #33353b;
    --panel-bg: #1f2024;
    --accent: #5b8def;
    --accent-fg: #0f1115;
    --hover: #262a36;
    --mark-bg: #7a5c00;
    --mark-fg: #fff3cd;
  }
}
:root[data-theme="dark"] {
  --bg: #17181c;
  --fg: #e6e6e6;
  --muted: #9aa1ac;
  --border: #33353b;
  --panel-bg: #1f2024;
  --accent: #5b8def;
  --accent-fg: #0f1115;
  --hover: #262a36;
  --mark-bg: #7a5c00;
  --mark-fg: #fff3cd;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
}

header {
  padding: 1.25rem 1.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}
header h1 { margin: 0 0 0.25rem; font-size: 1.3rem; }
.subtitle { margin: 0; color: var(--muted); font-size: 0.85rem; }

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

#search-panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}

#criteria-rows { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 0.5rem; }
.criterion-row { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.criterion-row input { flex: 1 1 160px; min-width: 0; }
.criterion-row select.criterion-xpath { flex: 1 1 160px; min-width: 0; }
.criterion-row .criterion-xpath-mode { flex: 0 0 auto; }
.criterion-row .find-unique { flex: 0 0 auto; font-size: 0.8rem; padding: 0.4rem 0.6rem; }

.filters-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: end;
  margin-top: 0.75rem;
}
.filters-row label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.8rem;
  color: var(--muted);
}

input, select, button {
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.55rem;
}

button {
  cursor: pointer;
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
  font-weight: 600;
}
button.secondary {
  background: transparent;
  color: var(--fg);
  border-color: var(--border);
  font-weight: 500;
}
button:hover { opacity: 0.85; }

.status { min-height: 1.2em; color: var(--muted); font-size: 0.85rem; margin: 0.5rem 0 0; }
.status.error { color: #dc2626; }

#results {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(320px, 2fr);
  gap: 1.25rem;
  min-height: 200px;
}
@media (max-width: 800px) {
  #results { grid-template-columns: 1fr; }
}

.panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.panel h2 {
  margin: 0;
  padding: 0.6rem 0.8rem;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel-bg);
}
.count { color: var(--muted); font-weight: 400; }

.list {
  max-height: 480px;
  overflow-y: auto;
}
.list .empty { padding: 1rem; color: var(--muted); font-size: 0.85rem; }

.app-row, .element-row {
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}
.app-row:hover, .element-row:hover { background: var(--hover); }
.app-row.selected, .element-row.selected { background: var(--hover); border-left: 3px solid var(--accent); }

.app-row .app-id { font-weight: 600; }
.app-row .app-meta { color: var(--muted); font-size: 0.8rem; margin-left: 0.4rem; }

.element-row .tag { font-family: ui-monospace, Menlo, Consolas, monospace; font-weight: 600; }
.element-row .xpath {
  display: block;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  color: var(--muted);
  word-break: break-all;
}
.element-row .snippet {
  display: block;
  font-size: 0.8rem;
  margin-top: 0.2rem;
  color: var(--fg);
}
.badge {
  display: inline-block;
  font-size: 0.65rem;
  padding: 0.05rem 0.35rem;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-fg);
  margin-right: 0.25rem;
}

#viewer-panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
#viewer-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.6rem 0.8rem;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}
.viewer-block { display: flex; flex-direction: column; gap: 0.2rem; flex: 0 0 auto; }
.viewer-block .viewer-nav { justify-content: flex-start; }
.viewer-block-xpath { flex: 1 1 auto; min-width: 0; }
.viewer-block-xpath .viewer-nav { justify-content: flex-end; }
.viewer-block-xpath .viewer-subline { text-align: right; }
.viewer-subline {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: default;
}
.viewer-nav { display: flex; align-items: center; gap: 0.4rem; flex: 0 0 auto; }
.viewer-nav button { padding: 0.25rem 0.55rem; }
.viewer-nav button:disabled { opacity: 0.4; cursor: default; }
#viewer-content {
  margin: 0;
  padding: 1rem;
  max-height: 60vh;
  overflow: auto;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-word;
}
#viewer-content mark {
  background: var(--mark-bg);
  color: var(--mark-fg);
  border-radius: 2px;
}