:root {
  color-scheme: light dark;
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #16202a;
  --muted: #667085;
  --line: #d8dee8;
  --primary: #1769e0;
  --danger: #b42318;
  --ok: #067647;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 18px 48px;
}

.topbar,
.section-heading,
.actions,
.page-row,
.page-row label {
  display: flex;
  align-items: center;
  gap: 14px;
}

.topbar,
.section-heading,
.page-row { justify-content: space-between; }

.topbar { margin-bottom: 20px; }

h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 6px; font-size: clamp(1.7rem, 3vw, 2.5rem); }
h2 { margin-bottom: 12px; font-size: 1.1rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  margin-bottom: 16px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
}

button,
.button {
  appearance: none;
  border: 1px solid #b8c0cc;
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  display: inline-block;
  font: inherit;
  padding: 9px 12px;
  text-decoration: none;
}

button:hover,
.button:hover { border-color: var(--primary); }
button:disabled { cursor: not-allowed; opacity: 0.55; }

.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.muted { color: var(--muted); }
.ok { color: var(--ok); margin-bottom: 0; }

.warnings ul,
.errors {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--danger);
}

.facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
}

.facts div {
  border-bottom: 1px solid var(--line);
  padding-bottom: 8px;
}

.facts dt {
  color: var(--muted);
  font-size: 0.8rem;
}

.facts dd {
  margin: 2px 0 0;
  font-weight: 650;
}

.message {
  min-height: 22px;
  margin-top: 14px;
  color: var(--ok);
}

.message.error { color: var(--danger); }

.pages {
  display: grid;
  gap: 10px;
}

.page-row {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}

.page-row label {
  min-width: 0;
}

.page-row img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
}

.page-row span {
  display: grid;
  gap: 2px;
}

.row-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.page-row small,
.event small {
  color: var(--muted);
}

.list {
  display: grid;
  gap: 10px;
}

.run,
.event,
.decision {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
}

.run summary { cursor: pointer; }
.run-body { margin-top: 10px; }
.run-body p { margin-bottom: 6px; }

.event {
  display: grid;
  gap: 2px;
}

.decision {
  display: flex;
  gap: 12px;
  justify-content: space-between;
}

.decision > div:first-child {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.diag {
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
}

.test-form {
  display: grid;
  gap: 10px;
}

.test-form input,
.test-form textarea {
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: var(--card);
  font: inherit;
  padding: 9px 10px;
  width: 100%;
}

@media (max-width: 760px) {
  .topbar,
  .section-heading,
  .page-row,
  .decision {
    align-items: stretch;
    flex-direction: column;
  }

  .grid,
  .facts { grid-template-columns: 1fr; }

  .actions { align-items: stretch; flex-direction: column; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1720;
    --card: #151f2b;
    --text: #e7edf4;
    --muted: #9aa6b2;
    --line: #2d3b49;
    --primary: #58a6ff;
    --danger: #ffb4ab;
    --ok: #8ee0b5;
  }
}