:root {
  --bg: #f7f7f8;
  --panel: #ffffff;
  --text: #101114;
  --muted: #667085;
  --line: #d9dee7;
  --soft: #f1f3f6;
  --accent: #111827;
  --ok: #166534;
  --warn: #a16207;
  --bad: #b42318;
  --skip: #475569;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
}

button,
textarea,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0 56px;
}

.page-header {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

.page-header h1 {
  margin: 0 0 8px;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: 0;
}

.page-header p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}

.panel,
.status-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.panel {
  padding: 18px;
}

.checker-form {
  display: grid;
  gap: 12px;
}

.form-head,
.controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.input-label {
  color: #344054;
  font-size: 14px;
  font-weight: 700;
}

.mode-tabs {
  display: inline-flex;
  gap: 4px;
  padding: 3px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.tool-tab {
  min-height: 32px;
  padding: 0 14px;
  color: #475467;
  background: transparent;
  border: 0;
  border-radius: 6px;
}

.tool-tab.active {
  color: var(--text);
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(16, 24, 40, 0.12);
}

textarea {
  width: 100%;
  min-height: 260px;
  resize: vertical;
  padding: 14px;
  color: var(--text);
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  line-height: 1.45;
}

textarea:focus {
  border-color: #98a2b3;
  box-shadow: 0 0 0 3px rgba(152, 162, 179, 0.18);
}

.file-control,
.toggle-row {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  gap: 8px;
  color: #475467;
  font-size: 14px;
}

.file-control {
  cursor: pointer;
}

.file-control input {
  display: none;
}

.toggle-row input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.primary-button,
.secondary-button,
.suggest-button {
  min-height: 38px;
  padding: 0 16px;
  border-radius: 7px;
  font-weight: 700;
}

.primary-button {
  color: #ffffff;
  background: var(--accent);
  border: 1px solid var(--accent);
}

.primary-button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.secondary-button {
  color: var(--text);
  background: #ffffff;
  border: 1px solid var(--line);
}

.status-panel {
  margin-top: 16px;
  padding: 16px;
}

.progress-wrap {
  margin-bottom: 12px;
  padding: 12px;
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 9px;
  color: var(--muted);
  font-size: 14px;
}

.progress-meta strong {
  color: var(--text);
}

.progress-track {
  height: 10px;
  overflow: hidden;
  background: #e8ecf2;
  border-radius: 999px;
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: #111827;
  border-radius: inherit;
  transition: width 180ms ease;
}

.progress-wrap.complete .progress-bar {
  background: #166534;
}

.summary-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}

.summary-cell {
  min-height: 62px;
  padding: 10px;
  text-align: left;
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.summary-button {
  cursor: pointer;
}

.summary-button:hover,
.summary-button.active {
  border-color: #111827;
  background: #ffffff;
}

.summary-button.active {
  box-shadow: inset 0 0 0 1px #111827;
}

.summary-cell strong {
  display: block;
  font-size: 20px;
}

.summary-cell span {
  color: var(--muted);
  font-size: 12px;
}

.status-line {
  min-height: 24px;
  color: var(--muted);
  font-size: 14px;
}

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

.results-stack {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.result-row {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 14px;
  align-items: start;
  padding: 14px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-left: 4px solid #cbd5e1;
  border-radius: 8px;
}

.result-row.filter-hidden {
  display: none;
}

.result-row.verified {
  border-left-color: var(--ok);
}

.result-row.suspicious {
  border-left-color: var(--warn);
}

.result-row.hallucinated,
.result-row.error-row {
  border-left-color: var(--bad);
}

.result-row.skipped {
  border-left-color: var(--skip);
}

.score-badge {
  display: grid;
  justify-items: center;
  color: var(--muted);
  font-size: 12px;
}

.score-badge strong {
  color: var(--text);
  font-size: 18px;
}

.result-body {
  min-width: 0;
}

.reference-snippet {
  margin: 0 0 6px;
  overflow: hidden;
  color: #98a2b3;
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.result-body h3 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.35;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.meta-line span,
.source-link,
.method-chip {
  min-height: 22px;
  padding: 3px 8px;
  color: #475467;
  background: var(--soft);
  border-radius: 5px;
  font-size: 12px;
}

.source-link {
  color: #175cd3;
  font-weight: 700;
  text-decoration: none;
}

.method-chip {
  color: #ffffff;
  background: var(--accent);
}

.details-line {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.issue-line {
  margin: 8px 0 0;
  padding: 8px 10px;
  color: var(--bad);
  background: #fff1f0;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
}

.suggest-button {
  margin-top: 10px;
  color: #ffffff;
  background: var(--accent);
  border: 1px solid var(--accent);
  font-size: 13px;
}

.suggestions {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.suggestion-row {
  display: grid;
  gap: 3px;
  padding: 10px;
  background: #fbfcfe;
  border: 1px solid var(--line);
  border-radius: 7px;
}

.suggestion-row a {
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.suggestion-row span {
  color: var(--muted);
  font-size: 12px;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 20px, 1040px);
    padding-top: 20px;
  }

  .summary-bar {
    grid-template-columns: repeat(2, 1fr);
  }

  .result-row {
    grid-template-columns: 52px 1fr;
  }

  .method-chip {
    grid-column: 2;
    width: fit-content;
  }

  .primary-button,
  .secondary-button {
    width: 100%;
  }
}