:root {
  --ink: #1a1f26;
  --muted: #6b7280;
  --line: #e2e5ea;
  --accent: #1f4e5f;
  --accent-soft: #eaf1f4;
  --bg: #fafafa;
  --danger: #b02418;
  --danger-soft: #fdecea;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

header {
  padding: 28px 24px 0;
  max-width: 760px;
  margin: 0 auto;
}

.back-link {
  display: inline-block;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

h1 {
  font-size: 22px;
  margin: 0 0 4px;
}

.version {
  font-weight: 400;
  color: var(--muted);
  font-size: 14px;
}

.tagline {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 20px;
}

nav {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--line);
}

.tab-btn {
  padding: 10px 16px;
  border: none;
  background: none;
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.field {
  margin-bottom: 16px;
}

.row {
  display: flex;
  gap: 16px;
}
.row .field { flex: 1; }

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 4px;
}

.hint {
  font-size: 12px;
  color: var(--muted);
  margin: 2px 0 0;
}

.hint-inline {
  font-weight: 400;
  color: var(--muted);
}

input, select, textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  background: white;
}

input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

.evidence-row {
  display: grid;
  grid-template-columns: 1.2fr 1.2fr 0.8fr 0.8fr 0.8fr auto;
  gap: 8px;
  margin-bottom: 8px;
  align-items: center;
}

.evidence-row input { font-size: 13px; }

.remove-row {
  background: none;
  border: none;
  color: var(--danger);
  cursor: pointer;
  font-size: 16px;
  padding: 4px 8px;
}

button.secondary {
  background: white;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  color: var(--ink);
}

button.secondary:hover { background: var(--accent-soft); }

button.primary {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.actions {
  margin-top: 20px;
}

.errors {
  background: var(--danger-soft);
  border: 1px solid #f3c6c1;
  border-radius: 6px;
  padding: 12px 14px;
  margin-bottom: 16px;
  color: var(--danger);
  font-size: 13px;
}

.errors ul { margin: 4px 0 0; padding-left: 18px; }

.output {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: white;
}

.output h3 {
  font-size: 13px;
  color: var(--muted);
  margin: 12px 0 6px;
}

.output pre {
  background: var(--accent-soft);
  padding: 12px;
  border-radius: 6px;
  font-size: 12px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.output-actions {
  display: flex;
  gap: 8px;
}

footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 12px 24px 40px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}