* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
/* Author CSS always wins over the UA stylesheet's default [hidden]{display:none},
   even at equal specificity — so any element toggled via the `hidden` attribute
   AND given its own `display` value (flex/grid/etc.) can never actually hide
   without this override. Every hide/show in this app uses the `hidden`
   attribute, so this rule must stay ahead of every component rule below it. */
[hidden] { display: none !important; }
body {
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: var(--font-base);
  line-height: 1.4;
}
button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}
h1, h2, h3, p { margin: 0 0 var(--gap) 0; }

/* ---- App shell ---- */
.app-header {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--brand-primary);
  color: var(--brand-primary-ink);
  padding: 0 8px;
  min-height: var(--tap-min);
  position: sticky;
  top: 0;
  z-index: 10;
}
.app-header__logo {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  object-fit: contain;
}
.app-header__title {
  flex: 1;
  font-weight: 700;
  font-size: var(--font-lg);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.app-header__exit,
.app-header__fuel {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.4);
  color: inherit;
  border-radius: var(--radius);
  padding: 8px 14px;
  min-height: 40px;
  font-weight: 600;
}

.view {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--gap);
  padding-bottom: 80px;
}

.app-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 13px;
  color: var(--c-ink-muted);
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: 6px 0;
}

/* ---- Tiles (home) ---- */
.tile-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}
.tile {
  display: block;
  width: 100%;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 20px 12px;
  text-align: center;
  font-weight: 700;
  font-size: var(--font-lg);
  min-height: 96px;
}
.tile[disabled] {
  opacity: 0.5;
  cursor: default;
}
.tile__sub {
  display: block;
  font-weight: 400;
  font-size: 14px;
  color: var(--c-ink-muted);
  margin-top: 4px;
}
.id-aid-link {
  display: block;
  width: 100%;
  text-align: center;
  margin-top: var(--gap);
  padding: 14px;
  border-radius: var(--radius);
  border: 1px dashed var(--c-border);
  background: transparent;
  color: var(--c-ink);
  font-weight: 600;
  min-height: var(--tap-min);
}

/* ---- Lists ---- */
.list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.list-item {
  width: 100%;
  text-align: left;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-height: var(--tap-min);
  font-size: var(--font-base);
  font-weight: 600;
}
.list-item__meta {
  display: block;
  font-weight: 400;
  font-size: 13px;
  color: var(--c-ink-muted);
  margin-top: 2px;
}
.search-box {
  width: 100%;
  padding: 12px 14px;
  font-size: var(--font-base);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  margin-bottom: var(--gap);
  min-height: var(--tap-min);
}

/* ---- Warning banners ---- */
.warning {
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 600;
  border-left: 6px solid transparent;
}
.warning--danger { background: var(--c-danger-bg); color: var(--c-danger); border-color: var(--c-danger); }
.warning--caution { background: var(--c-caution-bg); color: var(--c-caution); border-color: var(--c-caution); }
.warning--note { background: var(--c-note-bg); color: var(--c-note); border-color: var(--c-border); font-weight: 400; }

/* ---- Spec card ---- */
.spec-card {
  background: var(--c-surface-2);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: var(--gap);
  text-align: center;
}
.spec-card__label {
  font-size: 14px;
  color: var(--c-ink-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.spec-card__value {
  font-size: var(--font-spec);
  font-weight: 800;
  margin-top: 4px;
}
.spec-card__note {
  font-size: 14px;
  color: var(--c-ink-muted);
  margin-top: 6px;
}
.spec-card__seq {
  text-align: left;
  margin-top: 8px;
}
.spec-card__img {
  display: block;
  max-width: 100%;
  border-radius: 8px;
  margin: 8px auto 0 auto;
}

/* ---- Images ---- */
.image-strip {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: var(--gap);
}
.image-fig {
  margin: 0;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-surface);
}
.image-fig img {
  display: block;
  width: 100%;
  height: auto;
}
.image-fig figcaption {
  padding: 8px 10px;
  font-size: 13px;
  color: var(--c-ink-muted);
  border-top: 1px solid var(--c-border);
}

/* ---- Procedure / notes ---- */
.procedure {
  margin: 0 0 var(--gap) 0;
  padding-left: 20px;
}
.procedure li { margin-bottom: 6px; }
.notes {
  font-size: 14px;
  color: var(--c-ink-muted);
  margin-bottom: var(--gap);
}
.resolution__body { margin-top: 10px; }

/* ---- Inline glossary ---- */
.gloss { display: inline; }
.gloss > summary {
  display: inline;
  list-style: none;
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--c-surface-2);
  border-bottom: 2px dotted var(--c-ink-muted);
  font-weight: 700;
  cursor: pointer;
}
.gloss > summary::-webkit-details-marker { display: none; }
.gloss > summary::after { content: " ?"; color: var(--c-ink-muted); font-size: 0.85em; }
.gloss[open] > summary {
  background: var(--brand-accent);
  color: var(--brand-accent-ink);
  border-bottom-color: transparent;
}
.gloss[open] > summary::after { content: " \00d7"; color: inherit; }
.gloss__def {
  display: block;
  margin: 6px 0;
  padding: 10px 12px;
  background: var(--c-surface);
  border-left: 4px solid var(--brand-accent);
  border-radius: 6px;
  font: 400 15px/1.4 inherit;
  color: var(--c-ink);
}
.source-ref {
  font-size: 12px;
  color: var(--c-ink-muted);
  margin-top: 24px;
}

/* ---- Trail chips + Steps sheet ---- */
.trail-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  margin-bottom: 10px;
  -webkit-overflow-scrolling: touch;
}
.trail-chip {
  flex: 0 0 auto;
  max-width: 160px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 999px;
  border: 2px solid var(--c-border);
  background: var(--c-bg);
  min-height: 40px;
}
.trail-chip--current { border-color: var(--brand-primary); color: var(--brand-primary); font-weight: 700; }
.trail-chip--pass { border-color: var(--c-pass); background: var(--c-pass-bg); color: var(--c-pass); }
.trail-chip--fail { border-color: var(--c-fail); background: var(--c-fail-bg); color: var(--c-fail); }
.trail-chip--fix  { border-color: var(--c-fix);  background: var(--c-fix-bg);  color: var(--c-fix); }
.trail-chip--skip { border-color: var(--c-border); border-style: dashed; color: var(--c-ink-muted); }

.wizard-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: var(--gap);
}
.steps-btn {
  display: block;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 999px;
  border: 2px solid var(--c-border);
  background: var(--c-surface);
  font-weight: 700;
  font-size: 14px;
}

.steps-sheet {
  border: none;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0;
  width: 100%;
  max-width: 640px;
  margin: auto auto 0 auto;
  position: fixed;
  inset: auto 0 0 0;
  max-height: 80vh;
  color: var(--c-ink);
  background: var(--c-bg);
}
.steps-sheet::backdrop {
  background: rgba(0, 0, 0, 0.4);
}
.steps-sheet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  font-weight: 700;
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  background: var(--c-bg);
}
.steps-sheet__close {
  background: none;
  border: none;
  font-size: 24px;
  line-height: 1;
  min-width: var(--tap-min);
  min-height: var(--tap-min);
}
.steps-sheet__list {
  overflow-y: auto;
  max-height: calc(80vh - 56px);
  padding: 8px;
}
.steps-row {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
  padding: 12px;
  min-height: var(--tap-min);
  border: none;
  border-bottom: 1px solid var(--c-border);
  background: transparent;
}
.steps-row__num {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
}
.steps-row__body { display: flex; flex-direction: column; gap: 2px; }
.steps-row__title { font-weight: 600; }
.steps-row__status { font-size: 13px; color: var(--c-ink-muted); }
.steps-row--current .steps-row__num { background: var(--brand-primary); color: var(--brand-primary-ink); }
.steps-row--pass .steps-row__status { color: var(--c-pass); }
.steps-row--fail .steps-row__status { color: var(--c-fail); }
.steps-row--fix .steps-row__status { color: var(--c-fix); }
.steps-row--skip .steps-row__status { color: var(--c-ink-muted); font-style: italic; }

/* ---- Wizard ---- */
.step-title {
  font-size: var(--font-lg);
  font-weight: 700;
  margin-bottom: 8px;
}
.step-tool {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-ink-muted);
  background: var(--c-surface);
  border-radius: 6px;
  padding: 3px 8px;
  margin-bottom: var(--gap);
}
.options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: var(--gap);
}
.option-btn {
  min-height: var(--tap-min);
  border-radius: var(--radius);
  border: 2px solid var(--c-border);
  background: var(--c-bg);
  padding: 14px 16px;
  font-size: var(--font-base);
  font-weight: 700;
  text-align: left;
}
.option-btn--pass { border-color: var(--c-pass); background: var(--c-pass-bg); color: var(--c-pass); }
.option-btn--fail { border-color: var(--c-fail); background: var(--c-fail-bg); color: var(--c-fail); }
.option-btn--fix  { border-color: var(--c-fix);  background: var(--c-fix-bg);  color: var(--c-fix); }
.option-note {
  font-size: 13px;
  font-weight: 400;
  color: var(--c-ink-muted);
  margin-top: 6px;
  display: block;
}

/* ---- Resolution ---- */
.resolution {
  border-radius: var(--radius);
  padding: 18px;
}
.resolution--replace { background: var(--c-fix-bg); }
.resolution--repair  { background: var(--c-pass-bg); }
.resolution--escalate{ background: var(--c-fail-bg); }
.resolution--resolved{ background: var(--c-pass-bg); }
.resolution__part {
  margin-top: 10px;
  font-weight: 700;
}
.btn-primary {
  display: inline-block;
  margin-top: var(--gap);
  min-height: var(--tap-min);
  padding: 0 20px;
  border-radius: var(--radius);
  border: none;
  background: var(--brand-primary);
  color: var(--brand-primary-ink);
  font-weight: 700;
  font-size: var(--font-base);
}
.btn-secondary {
  display: inline-block;
  margin-top: var(--gap);
  margin-left: 10px;
  min-height: var(--tap-min);
  padding: 0 20px;
  border-radius: var(--radius);
  border: 2px solid var(--c-border);
  background: transparent;
  font-weight: 700;
  font-size: var(--font-base);
}

/* ---- Reference tables ---- */
table.ref-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--gap);
  font-size: 15px;
}
table.ref-table th, table.ref-table td {
  border: 1px solid var(--c-border);
  padding: 8px;
  text-align: left;
}
table.ref-table th {
  background: var(--c-surface);
}
.section-title {
  font-size: 16px;
  font-weight: 700;
  margin: 24px 0 10px 0;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--c-ink-muted);
}

@media (max-width: 380px) {
  .tile-grid { grid-template-columns: 1fr; }
}

/* ---- Checklist mode ---- */
.checklist-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.checklist-card {
  display: flex;
  gap: 12px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 14px;
}
.checklist-card--answered { opacity: 0.85; }
.checklist-card__num {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
}
.checklist-card__body { flex: 1; min-width: 0; }
.option-btn--chosen { box-shadow: inset 0 0 0 2px currentColor; }
.option-btn[disabled] { opacity: 0.7; cursor: default; }

/* ---- Chart view ---- */
.chart-legend {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: var(--gap);
  font-size: 13px;
  color: var(--c-ink-muted);
}
.chart-legend__item { display: inline-flex; align-items: center; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.dot--current { background: var(--brand-primary); }
.dot--visited { background: var(--c-pass); }
.dot--dim { background: var(--c-border); }

.chart-hint {
  font-size: 13px;
  color: var(--c-ink-muted);
  margin: 10px 0 var(--gap) 0;
}

.diagram-wrap {
  width: 100%;
  overflow: auto;
  touch-action: pan-x pan-y;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: var(--c-surface);
  margin-bottom: var(--gap);
}
.diagram-svg { display: block; }

.diagram-node rect {
  fill: var(--c-bg);
  stroke: var(--c-border);
  stroke-width: 2;
  cursor: pointer;
}
.diagram-node__label {
  font-size: 12px;
  font-weight: 600;
  line-height: 1.25;
  color: var(--c-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 100%;
  overflow: hidden;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.diagram-node--current rect { stroke: var(--brand-primary); stroke-width: 3; }
.diagram-node--current .diagram-node__label { font-weight: 800; }
.diagram-node--visited rect { stroke: var(--c-pass); background: var(--c-pass-bg); }
.diagram-node--pass rect { stroke: var(--c-pass); fill: var(--c-pass-bg); }
.diagram-node--fail rect { stroke: var(--c-fail); fill: var(--c-fail-bg); }
.diagram-node--fix rect { stroke: var(--c-fix); fill: var(--c-fix-bg); }
.diagram-node--dim rect { opacity: 0.55; }
.diagram-node--dim .diagram-node__label { color: var(--c-ink-muted); }
.diagram-exit {
  font-size: 10px;
  fill: var(--c-ink-muted);
  font-family: system-ui, sans-serif;
}

/* ---- Install bar ---- */
.install-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  padding: 10px var(--gap);
  font-size: 14px;
}
.install-bar__text { flex: 1; }
.install-bar button {
  min-height: 40px;
  padding: 0 14px;
  border-radius: var(--radius);
  border: none;
  background: var(--brand-primary);
  color: var(--brand-primary-ink);
  font-weight: 700;
  flex: 0 0 auto;
}
.install-bar__dismiss {
  background: transparent !important;
  color: var(--c-ink-muted) !important;
  font-weight: 400 !important;
  padding: 0 8px !important;
}

/* ---- First-run progress overlay ---- */
.progress-overlay {
  position: fixed;
  inset: 0;
  background: var(--c-bg);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--gap);
}
.progress-card { width: 100%; max-width: 360px; text-align: center; }
.progress-title { font-weight: 700; font-size: var(--font-lg); margin-bottom: 20px; }
.progress-bar {
  height: 12px;
  border-radius: 999px;
  background: var(--c-surface);
  overflow: hidden;
}
.progress-bar__fill {
  height: 100%;
  width: 0%;
  background: var(--brand-accent);
  transition: width 0.2s ease;
}
.progress-count { margin-top: 10px; font-size: 14px; color: var(--c-ink-muted); }
.progress-done { color: var(--c-pass); font-weight: 700; }

/* ---- Update toast ---- */
.update-toast {
  position: fixed;
  left: var(--gap);
  right: var(--gap);
  bottom: 60px;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--brand-primary);
  color: var(--brand-primary-ink);
  border-radius: var(--radius);
  padding: 12px 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}
.update-toast button {
  min-height: 40px;
  padding: 0 14px;
  border-radius: 8px;
  border: none;
  background: var(--brand-accent);
  color: var(--brand-accent-ink);
  font-weight: 700;
}