:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --ink: #1f2933;
  --muted: #5b6573;
  --accent: #0b5fff;
  --accent-soft: #e7efff;
  --border: #e3e6eb;
  --warn-bg: #fff7e6;
  --warn-ink: #8a5a00;
  --check-bg: #e9f7ef;
  --check-ink: #1b6f3a;
  --code-bg: #f1f3f5;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.45;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 5;
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  background: var(--accent);
  color: white;
  font-weight: 700;
  width: 36px; height: 36px;
  border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
}
.brand-title { font-weight: 600; font-size: 15px; }
.brand-sub { font-size: 12px; color: var(--muted); }

.search { position: relative; }
.search input {
  width: 320px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
}
.search input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

.layout {
  display: grid;
  grid-template-columns: 280px 1fr 300px;
  gap: 0;
  min-height: calc(100vh - 61px);
}

.rail {
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 16px;
}
.rail-right { border-right: none; border-left: 1px solid var(--border); }
.rail-loading, .rail-empty {
  color: var(--muted);
  font-size: 13px;
  padding: 12px 4px;
}

.category { margin-bottom: 18px; }
.category h3 {
  margin: 0 0 4px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.category .desc {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}
.scenario-link {
  display: block;
  width: 100%;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  padding: 8px 10px;
  margin-bottom: 4px;
  cursor: pointer;
  color: var(--ink);
  font-size: 13px;
}
.scenario-link:hover { background: var(--bg); }
.scenario-link.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.main-panel { padding: 24px 28px; overflow-y: auto; }
.empty-state {
  max-width: 480px;
  margin: 60px auto;
  text-align: center;
  color: var(--muted);
}

.scenario-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 18px;
}
.scenario-cat {
  font-size: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}
.scenario-title { font-size: 22px; margin: 4px 0 6px; }
.scenario-summary { color: var(--muted); max-width: 760px; }
.article-chip {
  display: inline-block;
  margin-top: 8px;
  font-size: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
  color: var(--muted);
}
.article-chip a { color: inherit; }

.section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  margin-bottom: 14px;
}
.section h2 {
  margin: 0 0 10px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.procedure-block { margin-bottom: 14px; }
.procedure-block:last-child { margin-bottom: 0; }
.procedure-heading { font-weight: 600; margin: 6px 0 6px; color: var(--ink); }
.procedure-steps { margin: 0; padding-left: 22px; }
.procedure-steps li { margin-bottom: 4px; }
.procedure-note {
  background: var(--warn-bg);
  color: var(--warn-ink);
  border-left: 3px solid #f0b429;
  padding: 6px 10px;
  border-radius: 4px;
  margin: 6px 0;
  font-size: 13px;
}

.checklist { list-style: none; padding: 0; margin: 0; }
.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 8px;
  border-radius: 4px;
}
.checklist li:hover { background: var(--bg); }
.checklist input[type="checkbox"] { margin-top: 3px; }

.screenshot, .embedded-image {
  border: 1px solid var(--border);
  border-radius: 6px;
  max-width: 100%;
  margin-bottom: 8px;
}
.image-caption { font-size: 12px; color: var(--muted); margin-bottom: 12px; }

.related-group h3 {
  margin: 0 0 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
}
.related-item {
  display: block;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  margin-bottom: 6px;
  text-align: left;
  cursor: pointer;
  font-size: 12.5px;
  color: var(--ink);
  width: 100%;
}
.related-item:hover { border-color: var(--accent); }
.related-item .link-text { display: block; }
.related-item .link-meta { display: block; color: var(--muted); font-size: 11px; margin-top: 2px; }
.related-item.no-target { color: var(--muted); cursor: default; }
.related-item.no-target:hover { border-color: var(--border); }

.search-results {
  position: absolute;
  top: 38px;
  right: 0;
  width: 420px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.08);
  max-height: 480px;
  overflow-y: auto;
  z-index: 10;
}
.search-results .hit {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
}
.search-results .hit:last-child { border-bottom: none; }
.search-results .hit:hover { background: var(--bg); }
.search-results .hit-title { font-weight: 600; font-size: 13px; }
.search-results .hit-meta { font-size: 11px; color: var(--muted); }
.search-results .hit-preview { font-size: 12px; color: var(--muted); margin-top: 4px; }

pre.raw-procedure {
  white-space: pre-wrap;
  background: var(--code-bg);
  padding: 10px 12px;
  border-radius: 6px;
  font-size: 12.5px;
}