:root {
  --ink: #1c2430;
  --ink-soft: #55637a;
  --line: #e3e7ee;
  --paper: #fbfaf7;
  --card: #ffffff;
  --accent: #0f5c8c;
  --accent-soft: #e7f1f8;
  --warn: #a8551b;
  --warn-soft: #fdf1e6;
  --ok: #2b6b46;
  --ok-soft: #e9f4ee;
  --shadow: 0 1px 2px rgba(28, 36, 48, 0.06), 0 8px 24px rgba(28, 36, 48, 0.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

a { color: var(--accent); }

.layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: 100vh;
}

/* ---------- sidebar ---------- */
.sidebar {
  background: var(--card);
  border-right: 1px solid var(--line);
  padding: 24px 0 48px;
  overflow-y: auto;
  max-height: 100vh;
  position: sticky;
  top: 0;
}

.brand {
  padding: 0 24px 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
}

.brand h1 {
  font-size: 17px;
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}

.brand p {
  margin: 0;
  font-size: 12.5px;
  color: var(--ink-soft);
}

.progress-summary {
  padding: 0 24px 16px;
  font-size: 12.5px;
  color: var(--ink-soft);
}

.progress-track {
  height: 4px;
  border-radius: 2px;
  background: var(--line);
  margin-top: 8px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0;
  transition: width 0.25s ease;
}

.nav-group { margin-bottom: 4px; }

.nav-group > button {
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  padding: 10px 24px;
  font: inherit;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
}

.nav-group > button:hover { background: var(--accent-soft); }
.nav-group.active > button { color: var(--accent); }

.nav-group .meta {
  font-weight: 400;
  font-size: 12px;
  color: var(--ink-soft);
}

.nav-steps {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
}

.nav-steps li button {
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  border-left: 2px solid transparent;
  padding: 6px 24px 6px 36px;
  font: inherit;
  font-size: 13px;
  color: var(--ink-soft);
  cursor: pointer;
}

.nav-steps li button:hover { background: var(--paper); }

.nav-steps li.current button {
  border-left-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.nav-steps li.done button::after {
  content: " ·";
  color: var(--ok);
}

/* ---------- main ---------- */
.main {
  padding: 32px 40px 80px;
  max-width: 1180px;
}

.crumbs {
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.main h2 {
  margin: 0 0 6px;
  font-size: 24px;
  letter-spacing: -0.015em;
}

.lede {
  margin: 0 0 20px;
  color: var(--ink-soft);
  max-width: 70ch;
}

.persona-line {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  font-size: 12.5px;
  color: var(--ink-soft);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
  margin-bottom: 20px;
}

.stage {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.stage-head {
  padding: 16px 20px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}

.stage-head h3 {
  margin: 0 0 4px;
  font-size: 16px;
}

.route {
  font: 12px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--ink-soft);
}

.step-count {
  font-size: 12.5px;
  color: var(--ink-soft);
  white-space: nowrap;
}

.shot-wrap {
  position: relative;
  background: #f1f3f6;
  display: block;
  line-height: 0;
}

.shot-wrap img {
  width: 100%;
  display: block;
}

.shot-missing {
  padding: 64px 24px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.5;
}

.hotspot {
  position: absolute;
  border: 2px solid var(--accent);
  border-radius: 6px;
  background: rgba(15, 92, 140, 0.1);
  box-shadow: 0 0 0 9999px rgba(28, 36, 48, 0.28);
  cursor: pointer;
  animation: pulse 2s ease-in-out infinite;
}

.hotspot.no-dim { box-shadow: none; }

@keyframes pulse {
  0%, 100% { border-color: var(--accent); }
  50% { border-color: rgba(15, 92, 140, 0.35); }
}

.hotspot-label {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 12px;
  line-height: 1.35;
  padding: 6px 10px;
  border-radius: 6px;
  white-space: nowrap;
  max-width: 320px;
}

.hotspot-label.flip-up { top: auto; bottom: 100%; margin: 0 0 6px; }
.hotspot-label.flip-left { left: auto; right: 0; }

.instruction {
  padding: 18px 20px;
  border-top: 1px solid var(--line);
}

.instruction .do {
  margin: 0 0 10px;
  font-weight: 600;
}

.instruction .why {
  margin: 0;
  color: var(--ink-soft);
  max-width: 78ch;
}

.callout {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 13.5px;
  border: 1px solid transparent;
}

.callout.note { background: var(--accent-soft); border-color: #cfe2ee; }
.callout.watch { background: var(--warn-soft); border-color: #f0d9c2; color: var(--warn); }
.callout.result { background: var(--ok-soft); border-color: #cfe6d9; color: var(--ok); }

.callout strong { display: block; margin-bottom: 2px; }

.controls {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 14px 20px;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

button.btn {
  font: inherit;
  padding: 8px 16px;
  border-radius: 7px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}

button.btn:hover:not(:disabled) { border-color: #c9d2de; }

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

button.btn:disabled { opacity: 0.45; cursor: default; }

.spacer { flex: 1; }

.uat-ref {
  font-size: 12.5px;
  color: var(--ink-soft);
}

.uat-ref code {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 12px;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.overview-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
  box-shadow: var(--shadow);
  text-align: left;
  font: inherit;
  cursor: pointer;
}

.overview-card:hover { border-color: #c9d2de; }

.overview-card h3 { margin: 0 0 6px; font-size: 15px; }
.overview-card p { margin: 0 0 10px; color: var(--ink-soft); font-size: 13.5px; }
.overview-card .meta { font-size: 12px; color: var(--ink-soft); }

table.reference {
  border-collapse: collapse;
  width: 100%;
  margin-top: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  font-size: 13.5px;
}

table.reference th, table.reference td {
  text-align: left;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

table.reference th { background: var(--paper); font-size: 12.5px; }
table.reference tr:last-child td { border-bottom: 0; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; max-height: none; }
  .main { padding: 24px 20px 60px; }
}

@media print {
  .sidebar, .controls { display: none; }
}