/*
 * CARSPARE EPC guided workflow animation.
 * Entry: epc-tutorial/index.html, also embedded by views/storefront/epc/index.php.
 * Dependencies: assets/css/apex-vi.css tokens only; no remote fonts, CDN or libraries.
 * Convention: the JS timeline owns timing and writes numeric custom properties;
 * CSS owns appearance and interpolation so all steps share one clock.
 */

:root {
  --tutorial-ink: var(--apx-charcoal-900);
  --tutorial-ink-soft: var(--apx-slate-500);
  --tutorial-line: var(--apx-line);
  --tutorial-line-strong: var(--apx-line-strong);
  --tutorial-surface: var(--apx-white);
  --tutorial-surface-soft: var(--apx-surface);
  --tutorial-accent: var(--apx-forest-700);
  --tutorial-accent-strong: var(--apx-forest-600);
  --tutorial-accent-soft: var(--apx-forest-100);
  --tutorial-grid-small: color-mix(in srgb, var(--apx-slate-300) 27%, transparent);
  --tutorial-grid-large: color-mix(in srgb, var(--apx-slate-300) 42%, transparent);
  --tutorial-ease: var(--apx-ease-standard);
  --brand-draw: 0;
  --model-draw: 0;
  --generation-draw: 0;
  --configuration-draw: 0;
  --explode: 0;
  --reset-fade: 0;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-width: 0;
  min-height: 100%;
  margin: 0;
}

body {
  display: grid;
  min-height: 100vh;
  place-items: center;
  overflow: hidden;
  background: var(--apx-surface);
  color: var(--tutorial-ink);
  font-family: var(--apx-font-sans);
}

.tutorial-document--embed,
.tutorial-document--embed body {
  width: 100%;
  height: 100%;
  min-height: 0;
  background: transparent;
}

.tutorial-document--embed .epc-tutorial {
  width: 100%;
  height: 100%;
  min-height: 0;
  border: 0;
  border-radius: 0;
}

.epc-tutorial {
  position: relative;
  display: grid;
  width: min(100%, 980px);
  min-height: 440px;
  aspect-ratio: 1.52 / 1;
  grid-template-rows: 48px minmax(0, 1fr) 48px;
  overflow: hidden;
  border: 1px solid var(--tutorial-line);
  border-radius: var(--apx-radius-card);
  background: var(--tutorial-surface);
  box-shadow: var(--apx-shadow-2);
}

/* HUD —— 当前步骤、当前状态与统一进度。 */
.tutorial-hud {
  position: relative;
  z-index: 12;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 0 18px;
  border-bottom: 1px solid var(--tutorial-line);
  background: color-mix(in srgb, var(--apx-white) 95%, transparent);
}

.tutorial-hud__identity {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
}

.tutorial-hud__mark {
  display: grid;
  width: 29px;
  height: 29px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--tutorial-accent);
  border-radius: var(--apx-radius-control);
  background: var(--tutorial-accent-soft);
  color: var(--tutorial-accent);
  font-family: var(--apx-font-mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.tutorial-hud__eyebrow {
  display: block;
  overflow: hidden;
  margin-bottom: 1px;
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tutorial-hud h1 {
  overflow: hidden;
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tutorial-hud__state {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  font-family: var(--apx-font-mono);
  white-space: nowrap;
}

.tutorial-hud__counter {
  color: var(--tutorial-accent);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.tutorial-hud__status {
  max-width: 250px;
  overflow: hidden;
  color: var(--tutorial-ink-soft);
  font-size: 9px;
  text-overflow: ellipsis;
}

.tutorial-progress {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  overflow: hidden;
  background: var(--apx-surface-sunken);
}

.tutorial-progress__fill {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--tutorial-accent-strong);
  transform: scaleX(0);
  transform-origin: left center;
}

/* Stage —— 工程纸、扫描线与五种场景。 */
.tutorial-stage {
  position: relative;
  z-index: 1;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--tutorial-surface);
  isolation: isolate;
}

.tutorial-stage__grid {
  position: absolute;
  z-index: -2;
  inset: 0;
  background-image:
    linear-gradient(var(--tutorial-grid-small) 1px, transparent 1px),
    linear-gradient(90deg, var(--tutorial-grid-small) 1px, transparent 1px),
    linear-gradient(var(--tutorial-grid-large) 1px, transparent 1px),
    linear-gradient(90deg, var(--tutorial-grid-large) 1px, transparent 1px);
  background-size: 20px 20px, 20px 20px, 80px 80px, 80px 80px;
}

.tutorial-stage::before,
.tutorial-stage::after {
  position: absolute;
  z-index: -1;
  width: 16px;
  height: 16px;
  border-color: var(--tutorial-line-strong);
  content: "";
}

.tutorial-stage::before {
  top: 10px;
  left: 10px;
  border-top: 1px solid;
  border-left: 1px solid;
}

.tutorial-stage::after {
  right: 10px;
  bottom: 10px;
  border-right: 1px solid;
  border-bottom: 1px solid;
}

.blueprint-coordinate {
  position: absolute;
  z-index: 2;
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  letter-spacing: 0.08em;
  opacity: 0.72;
  pointer-events: none;
}

.blueprint-coordinate--top {
  top: 8px;
  left: 34px;
}

.blueprint-coordinate--side {
  right: 7px;
  bottom: 42px;
  transform: rotate(-90deg) translateX(100%);
  transform-origin: right bottom;
}

.scan-line {
  position: absolute;
  z-index: 8;
  top: 0;
  right: 3%;
  left: 3%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--tutorial-accent-strong) 40%, var(--tutorial-accent-strong) 60%, transparent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--apx-forest-300) 70%, transparent);
  opacity: 0;
  pointer-events: none;
}

.selection-zone,
.drawing-zone,
.epc-schedule {
  transition:
    inset 0.45s var(--tutorial-ease),
    width 0.45s var(--tutorial-ease),
    height 0.45s var(--tutorial-ease),
    opacity 0.28s var(--tutorial-ease),
    transform 0.45s var(--tutorial-ease);
}

.selection-zone {
  position: absolute;
  z-index: 5;
  top: 22px;
  bottom: 22px;
  left: 20px;
  width: 39%;
}

.drawing-zone {
  position: absolute;
  z-index: 3;
  top: 18px;
  right: 20px;
  bottom: 18px;
  left: 43%;
}

.epc-schedule {
  position: absolute;
  z-index: 7;
  top: 78px;
  right: 16px;
  bottom: 18px;
  width: 34%;
  overflow: hidden;
  border: 1px solid var(--tutorial-line);
  border-radius: var(--apx-radius-control);
  background: color-mix(in srgb, var(--apx-white) 94%, transparent);
  opacity: 0;
  pointer-events: none;
  transform: translateX(16px);
}

/* 选择面板：按 data-step 只显示当前层。 */
.selection-panel {
  position: absolute;
  inset: 0;
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 15px;
  overflow: hidden;
  border: 1px solid var(--tutorial-line-strong);
  border-radius: var(--apx-radius-card);
  background: color-mix(in srgb, var(--apx-white) 93%, transparent);
  box-shadow: var(--apx-shadow-1);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-8px) scale(0.985);
  transition:
    opacity 0.26s var(--tutorial-ease),
    transform 0.36s var(--tutorial-ease),
    padding 0.35s var(--tutorial-ease),
    border-color 0.26s var(--tutorial-ease);
}

.epc-tutorial[data-step="1"] [data-panel="brand"],
.epc-tutorial[data-step="2"] [data-panel="model"],
.epc-tutorial[data-step="3"] [data-panel="generation"],
.epc-tutorial[data-step="4"] [data-panel="configuration"],
.epc-tutorial[data-step="5"] [data-panel="diagram"] {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0) scale(1);
}

.epc-tutorial[data-step="2"] [data-panel="brand"],
.epc-tutorial[data-step="3"] [data-panel="model"] {
  transform: translateY(-9px) scale(0.93);
}

.panel-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--tutorial-accent);
  font-family: var(--apx-font-mono);
  font-size: 8px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.panel-label b {
  display: grid;
  width: 22px;
  height: 18px;
  place-items: center;
  border: 1px solid var(--tutorial-line);
  border-radius: 2px;
  background: var(--apx-white);
  color: var(--tutorial-ink-soft);
  font-size: 8px;
}

.panel-label--compact {
  margin-top: 10px;
}

.panel-copy {
  max-width: 24ch;
  margin: 8px 0 14px;
  color: var(--tutorial-ink-soft);
  font-size: 10px;
  line-height: 1.5;
}

.brand-grid {
  display: grid;
  flex: 1;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
}

.brand-option {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  border: 1px solid var(--tutorial-line);
  border-radius: var(--apx-radius-control);
  background: var(--apx-white);
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity 0.2s var(--tutorial-ease),
    transform 0.28s var(--tutorial-ease),
    border-color 0.18s var(--tutorial-ease),
    background-color 0.18s var(--tutorial-ease);
}

.epc-tutorial[data-brand-visible="1"] .brand-option[data-brand="toyota"],
.epc-tutorial[data-brand-visible="2"] .brand-option[data-brand="toyota"],
.epc-tutorial[data-brand-visible="2"] .brand-option[data-brand="honda"],
.epc-tutorial[data-brand-visible="3"] .brand-option[data-brand="toyota"],
.epc-tutorial[data-brand-visible="3"] .brand-option[data-brand="honda"],
.epc-tutorial[data-brand-visible="3"] .brand-option[data-brand="nissan"],
.epc-tutorial[data-brand-visible="4"] .brand-option[data-brand="toyota"],
.epc-tutorial[data-brand-visible="4"] .brand-option[data-brand="honda"],
.epc-tutorial[data-brand-visible="4"] .brand-option[data-brand="nissan"],
.epc-tutorial[data-brand-visible="4"] .brand-option[data-brand="mazda"] {
  opacity: 1;
  transform: translateY(0);
}

.brand-option b {
  display: grid;
  width: 25px;
  height: 25px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--tutorial-line);
  border-radius: 50%;
  color: var(--tutorial-ink);
  font-family: var(--apx-font-mono);
  font-size: 10px;
}

.brand-option span {
  overflow: hidden;
  font-size: 10px;
  font-weight: 600;
  text-overflow: ellipsis;
}

.brand-option.is-selected {
  border-color: var(--tutorial-accent-strong);
  background: var(--apx-forest-050);
  box-shadow: inset 2px 0 0 var(--tutorial-accent-strong);
}

.brand-option.is-selected b {
  border-color: var(--tutorial-accent-strong);
  background: var(--tutorial-accent-strong);
  color: var(--apx-white);
}

.scan-label {
  margin-top: 9px;
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  letter-spacing: 0.08em;
  opacity: 0;
}

.epc-tutorial[data-phase="brand"] .scan-label {
  opacity: 0.75;
}

.selected-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border: 1px solid var(--tutorial-line);
  border-radius: var(--apx-radius-control);
  background: var(--apx-white);
}

.selected-chip__mono {
  display: grid;
  width: 23px;
  height: 23px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  background: var(--tutorial-accent-strong);
  color: var(--apx-white);
  font-family: var(--apx-font-mono);
  font-size: 9px;
  font-weight: 700;
}

.selected-chip > span:nth-child(2) {
  display: flex;
  min-width: 0;
  flex-direction: column;
}

.selected-chip small {
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  letter-spacing: 0.04em;
  line-height: 1.3;
  text-transform: uppercase;
}

.selected-chip strong {
  overflow: hidden;
  font-size: 10px;
  font-weight: 700;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.selected-chip__check {
  margin-left: auto;
  color: var(--tutorial-accent);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  font-weight: 700;
  text-transform: uppercase;
}

.selected-chip--compact {
  padding-block: 5px;
}

.selected-chip--generation {
  border-left: 2px solid var(--tutorial-accent-strong);
}

.option-list,
.generation-list {
  display: flex;
  min-height: 0;
  flex: 1;
  flex-direction: column;
  gap: 6px;
}

.option-row,
.generation-row {
  display: flex;
  min-height: 0;
  flex: 1;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 9px;
  border: 1px solid var(--tutorial-line);
  border-radius: var(--apx-radius-control);
  background: var(--apx-white);
  opacity: 0;
  transform: translateX(14px);
  transition:
    opacity 0.22s var(--tutorial-ease),
    transform 0.3s var(--tutorial-ease),
    border-color 0.18s var(--tutorial-ease),
    background-color 0.18s var(--tutorial-ease);
}

.epc-tutorial[data-option-visible="1"] .option-row:nth-child(1),
.epc-tutorial[data-option-visible="2"] .option-row:nth-child(1),
.epc-tutorial[data-option-visible="2"] .option-row:nth-child(2),
.epc-tutorial[data-option-visible="3"] .option-row:nth-child(1),
.epc-tutorial[data-option-visible="3"] .option-row:nth-child(2),
.epc-tutorial[data-option-visible="3"] .option-row:nth-child(3),
.epc-tutorial[data-generation-visible="1"] .generation-row:nth-child(1),
.epc-tutorial[data-generation-visible="2"] .generation-row:nth-child(1),
.epc-tutorial[data-generation-visible="2"] .generation-row:nth-child(2),
.epc-tutorial[data-generation-visible="3"] .generation-row:nth-child(1),
.epc-tutorial[data-generation-visible="3"] .generation-row:nth-child(2),
.epc-tutorial[data-generation-visible="3"] .generation-row:nth-child(3) {
  opacity: 1;
  transform: translateX(0);
}

.option-row strong,
.generation-row strong {
  font-size: 11px;
}

.option-row small,
.generation-row small {
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 8px;
}

.option-row.is-selected,
.generation-row.is-selected {
  border-color: var(--tutorial-accent-strong);
  background: var(--apx-forest-050);
  box-shadow: inset 2px 0 0 var(--tutorial-accent-strong);
}

.generation-row.is-selected {
  transform: scale(1.015);
}

.year-track {
  display: flex;
  height: 20px;
  align-items: center;
  gap: 5px;
  margin-top: 7px;
}

.year-track span {
  width: 18px;
  height: 1px;
  background: var(--tutorial-line-strong);
}

.year-track i {
  width: 5px;
  height: 5px;
  border: 1px solid var(--tutorial-line-strong);
  border-radius: 50%;
  background: var(--apx-white);
  transition: background-color 0.2s var(--tutorial-ease), border-color 0.2s var(--tutorial-ease);
}

.epc-tutorial[data-generation-visible="1"] .year-track i:nth-of-type(1),
.epc-tutorial[data-generation-visible="2"] .year-track i:nth-of-type(1),
.epc-tutorial[data-generation-visible="2"] .year-track i:nth-of-type(2),
.epc-tutorial[data-generation-visible="3"] .year-track i {
  border-color: var(--tutorial-accent-strong);
  background: var(--tutorial-accent-strong);
}

.configuration-fields {
  display: grid;
  min-height: 0;
  flex: 1;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
  margin-top: 9px;
}

.configuration-field {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 6px 8px;
  border: 1px solid var(--tutorial-line);
  border-radius: var(--apx-radius-control);
  background: var(--apx-white);
  opacity: 0;
  transform: translateX(-13px);
  transition: opacity 0.2s var(--tutorial-ease), transform 0.3s var(--tutorial-ease);
}

.configuration-field:nth-child(even) {
  transform: translateX(13px);
}

.configuration-field:last-child {
  grid-column: 1 / -1;
}

.configuration-field.is-in {
  opacity: 1;
  transform: translateX(0);
}

.configuration-field span {
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.configuration-field strong {
  overflow: hidden;
  font-family: var(--apx-font-mono);
  font-size: 9px;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vehicle-confirm {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 9px;
  padding: 6px 8px;
  border: 1px solid var(--tutorial-accent-strong);
  border-radius: var(--apx-radius-control);
  background: var(--tutorial-accent-soft);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.22s var(--tutorial-ease), transform 0.32s var(--tutorial-ease);
}

.vehicle-confirm.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.vehicle-confirm__icon {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border-radius: 50%;
  background: var(--tutorial-accent-strong);
  color: var(--apx-white);
  font-size: 11px;
  font-weight: 700;
}

.vehicle-confirm > span:last-child {
  display: flex;
  flex-direction: column;
}

.vehicle-confirm small {
  color: var(--tutorial-accent);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.vehicle-confirm strong {
  font-size: 10px;
}

/* ---------- 第五步：配置摘要 + 爆炸图 + OE 清单 ---------- */
.epc-tutorial[data-step="5"] .selection-zone {
  top: 16px;
  right: 20px;
  bottom: auto;
  left: 20px;
  width: auto;
  height: 48px;
}

.epc-tutorial[data-step="5"] .drawing-zone {
  top: 76px;
  right: 35%;
  left: 16px;
  bottom: 14px;
}

.epc-tutorial[data-step="5"] .epc-schedule {
  opacity: 1;
  transform: translateX(0);
}

.epc-tutorial[data-step="5"] [data-panel="diagram"] {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.vehicle-summary {
  display: flex;
  height: 100%;
  min-width: 0;
  align-items: center;
  gap: 12px;
  padding: 6px 10px;
  border: 1px solid var(--tutorial-line-strong);
  border-left: 3px solid var(--tutorial-accent-strong);
  border-radius: var(--apx-radius-control);
  background: color-mix(in srgb, var(--apx-white) 95%, transparent);
}

.vehicle-summary__mono {
  display: grid;
  width: 27px;
  height: 27px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  background: var(--tutorial-accent-strong);
  color: var(--apx-white);
  font-family: var(--apx-font-mono);
  font-size: 10px;
  font-weight: 700;
}

.vehicle-summary > span:not(.vehicle-summary__mono):not(.vehicle-summary__badge) {
  display: flex;
  min-width: 0;
  flex: 1;
  flex-direction: column;
}

.vehicle-summary small {
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  letter-spacing: 0.06em;
}

.vehicle-summary strong {
  overflow: hidden;
  font-size: 9px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.vehicle-summary__badge {
  flex: 0 0 auto;
  padding: 4px 6px;
  border: 1px solid var(--apx-stock-line);
  border-radius: 2px;
  background: var(--apx-stock-bg);
  color: var(--apx-stock-fg);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

/* ---------- 车辆图面 ---------- */
.drawing-view {
  position: absolute;
  inset: 0;
  /* 底部 42px 留给步骤操作说明，避免说明条覆盖车辆或 EPC 图面。 */
  bottom: 42px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.32s var(--tutorial-ease), transform 0.45s var(--tutorial-ease);
  transform: scale(0.985);
}

.epc-tutorial[data-step="1"] .drawing-view--brand,
.epc-tutorial[data-step="2"] .drawing-view--model,
.epc-tutorial[data-step="3"] .drawing-view--generation,
.epc-tutorial[data-step="4"] .drawing-view--configuration,
.epc-tutorial[data-step="5"] .drawing-view--epc {
  opacity: 1;
  transform: scale(1);
}

.drawing-caption {
  position: absolute;
  top: 6px;
  right: 4px;
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  letter-spacing: 0.06em;
}

/* 步骤操作说明 —— 只占图面列，随当前步骤更新；沿用既有表面、边线和 Forest 强调。 */
.tutorial-operation {
  position: absolute;
  z-index: 4;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  min-height: 36px;
  align-items: center;
  gap: 8px;
  padding: 5px 9px;
  border: 1px solid var(--tutorial-line);
  border-left: 2px solid var(--tutorial-accent-strong);
  border-radius: var(--apx-radius-control);
  background: color-mix(in srgb, var(--apx-white) 94%, transparent);
}

.tutorial-operation__step {
  flex: 0 0 auto;
  color: var(--tutorial-accent);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.tutorial-operation p {
  min-width: 0;
  margin: 0;
  color: var(--tutorial-ink);
  font-size: 8.5px;
  font-weight: 500;
  line-height: 1.35;
}

/* 第五步右侧已有 OE 清单，说明条内收，避免边框与清单列贴在一起。 */
.epc-tutorial[data-step="5"] .tutorial-operation {
  right: 32px;
}

.vehicle-blueprint,
.vehicle-generations,
.configuration-blueprint,
.epc-exploded {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.vehicle-blueprint__guides,
.configuration-blueprint__guides,
.generation-baseline,
.epc-centerline {
  fill: none;
  stroke: var(--tutorial-line-strong);
  stroke-width: 1;
  stroke-dasharray: 2 5;
}

.vehicle-blueprint__body path,
.vehicle-blueprint__body circle,
.configuration-blueprint__car path,
.configuration-blueprint__car circle,
.configuration-blueprint__car ellipse {
  fill: none;
  stroke: var(--tutorial-ink);
  stroke-width: 1.55;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.configuration-blueprint__car .configuration-detail {
  stroke-width: 0.9;
  opacity: 0.72;
}

.configuration-blueprint__car .configuration-light {
  stroke: var(--tutorial-accent-strong);
  stroke-width: 1.15;
}

.configuration-blueprint__car .configuration-axis {
  fill: none;
  stroke: var(--tutorial-accent-strong);
  stroke-width: 0.8;
  stroke-dasharray: 2 5;
  opacity: 0.68;
}

.vehicle-blueprint__body--model path,
.vehicle-blueprint__body--model circle {
  stroke: var(--tutorial-accent);
  stroke-width: 1.7;
}

.vehicle-blueprint__labels path,
.configuration-blueprint__labels path {
  fill: none;
  stroke: var(--tutorial-ink-soft);
  stroke-width: 0.8;
}

.vehicle-blueprint__labels text,
.configuration-blueprint__labels text {
  fill: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  letter-spacing: 0.05em;
}

[data-draw="brand"] {
  stroke-dasharray: 1;
  stroke-dashoffset: calc(1 - var(--brand-draw));
}

[data-draw="model"] {
  stroke-dasharray: 1;
  stroke-dashoffset: calc(1 - var(--model-draw));
}

[data-draw="configuration"] {
  stroke-dasharray: 1;
  stroke-dashoffset: calc(1 - var(--configuration-draw));
}

.generation-sketch {
  fill: none;
  stroke: var(--tutorial-ink);
  stroke-width: 1.45;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.28;
  transition: opacity 0.25s var(--tutorial-ease), transform 0.35s var(--tutorial-ease);
}

.generation-sketch text {
  fill: var(--tutorial-ink-soft);
  stroke: none;
  font-family: var(--apx-font-mono);
  font-size: 8px;
  letter-spacing: 0.04em;
}

.generation-sketch.is-lit {
  opacity: 1;
}

.generation-sketch.is-target {
  stroke: var(--tutorial-accent);
  stroke-width: 1.85;
  opacity: 1;
}

.generation-sketch.is-target text {
  fill: var(--tutorial-accent);
  font-weight: 700;
}

.generation-node {
  fill: var(--tutorial-surface);
  stroke: var(--tutorial-line-strong);
  stroke-width: 1.3;
  transition: fill 0.2s var(--tutorial-ease), stroke 0.2s var(--tutorial-ease), r 0.2s var(--tutorial-ease);
}

.generation-node.is-lit {
  fill: var(--tutorial-accent-strong);
  stroke: var(--tutorial-accent-strong);
}

.generation-node.is-target {
  r: 7px;
  stroke-width: 3;
  stroke: var(--apx-forest-100);
}

.generation-target {
  position: absolute;
  right: 6px;
  bottom: 4px;
  display: flex;
  flex-direction: column;
  padding: 6px 8px;
  border: 1px solid var(--tutorial-accent-strong);
  border-radius: var(--apx-radius-control);
  background: var(--apx-forest-050);
  opacity: 0;
  transform: translateY(7px);
  transition: opacity 0.2s var(--tutorial-ease), transform 0.28s var(--tutorial-ease);
}

.generation-target.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.generation-target small {
  color: var(--tutorial-accent);
  font-family: var(--apx-font-mono);
  font-size: 6px;
  letter-spacing: 0.05em;
}

.generation-target strong {
  font-family: var(--apx-font-mono);
  font-size: 10px;
}

.configuration-stamp {
  position: absolute;
  right: 8px;
  bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 9px;
  border: 1px solid var(--tutorial-accent-strong);
  border-radius: var(--apx-radius-control);
  background: color-mix(in srgb, var(--apx-forest-050) 95%, transparent);
  opacity: 0;
  transform: translateY(8px) scale(0.96);
  transition: opacity 0.2s var(--tutorial-ease), transform 0.3s var(--tutorial-ease);
}

.configuration-stamp.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.configuration-stamp__ring {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border-radius: 50%;
  background: var(--tutorial-accent-strong);
  color: var(--apx-white);
  font-size: 12px;
  font-weight: 700;
}

.configuration-stamp > span:last-child {
  display: flex;
  flex-direction: column;
}

.configuration-stamp small {
  color: var(--tutorial-accent);
  font-family: var(--apx-font-mono);
  font-size: 6px;
  letter-spacing: 0.05em;
}

.configuration-stamp strong {
  font-size: 9px;
}

/* ---------- EPC 爆炸图 ---------- */
.epc-figure-meta {
  position: absolute;
  z-index: 2;
  top: 5px;
  left: 4px;
  display: flex;
  flex-direction: column;
  padding: 6px 8px;
  border: 1px solid var(--tutorial-line);
  border-radius: 2px;
  background: color-mix(in srgb, var(--apx-white) 91%, transparent);
}

.epc-figure-meta span {
  color: var(--tutorial-accent);
  font-size: 7px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.epc-figure-meta strong {
  margin-top: 1px;
  font-size: 10px;
}

.epc-figure-meta small {
  margin-top: 2px;
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 6px;
  letter-spacing: 0.03em;
}

.epc-part {
  fill: none;
  stroke: var(--tutorial-ink);
  stroke-width: 1.3;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0;
  transition:
    opacity 0.2s var(--tutorial-ease),
    transform 0.15s linear,
    stroke 0.25s var(--tutorial-ease),
    stroke-width 0.25s var(--tutorial-ease);
}

.epc-part.is-visible {
  opacity: 1;
}

.epc-part-detail {
  stroke-width: 0.75;
  opacity: 0.68;
}

.epc-part-boss {
  fill: var(--apx-white);
  stroke-width: 1.1;
}

.epc-part--strut {
  transform: translate(calc(var(--explode) * -13px), calc(var(--explode) * -18px));
}

.epc-part--knuckle {
  transform: translate(calc(var(--explode) * 17px), calc(var(--explode) * -3px));
}

.epc-part--arm {
  transform: translate(calc(var(--explode) * -17px), calc(var(--explode) * 14px));
}

.epc-part--tie-rod {
  transform: translate(calc(var(--explode) * -24px), calc(var(--explode) * 2px));
}

.epc-part--subframe {
  transform: translate(0, calc(var(--explode) * 10px));
}

.epc-part--link {
  transform: translate(calc(var(--explode) * 20px), calc(var(--explode) * 8px));
}

.epc-part--arm.is-selected {
  stroke: var(--tutorial-accent);
  stroke-width: 2.35;
}

.epc-callout {
  opacity: 0;
  transition: opacity 0.2s var(--tutorial-ease);
}

.epc-callout path,
.epc-callout circle {
  fill: var(--tutorial-surface);
  stroke: var(--tutorial-accent-strong);
  stroke-width: 0.9;
}

.epc-callout text {
  fill: var(--tutorial-accent);
  font-family: var(--apx-font-mono);
  font-size: 8px;
  font-weight: 700;
}

.epc-callout.is-visible {
  opacity: 1;
}

.epc-selected-marker {
  fill: none;
  stroke: var(--tutorial-accent-strong);
  stroke-width: 1;
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
  transition: opacity 0.2s var(--tutorial-ease), transform 0.3s var(--tutorial-ease);
  transform: scale(0.7);
}

.epc-selected-marker.is-visible {
  opacity: 0.9;
  transform: scale(1);
}

.epc-selected-marker circle:last-child {
  stroke-dasharray: 3 3;
  opacity: 0.65;
}

.epc-scan {
  position: absolute;
  z-index: 3;
  top: 14%;
  right: 2%;
  left: 2%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--tutorial-accent-strong), transparent);
  opacity: 0;
  pointer-events: none;
}

.epc-schedule__head {
  display: grid;
  grid-template-columns: 1fr 2.2fr;
  gap: 8px;
  padding: 8px 9px;
  border-bottom: 1px solid var(--tutorial-line);
  background: var(--apx-surface-sunken);
  color: var(--tutorial-ink-soft);
  font-family: var(--apx-font-mono);
  font-size: 6px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.epc-schedule__head span:first-child {
  grid-column: 1 / -1;
}

.epc-schedule__rows {
  display: flex;
  flex-direction: column;
}

.epc-schedule__row {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 7px;
  align-items: center;
  padding: 6px 8px;
  border-bottom: 1px solid var(--tutorial-line);
  opacity: 0;
  transform: translateX(12px);
  transition: opacity 0.2s var(--tutorial-ease), transform 0.3s var(--tutorial-ease), background-color 0.2s var(--tutorial-ease);
}

.epc-schedule__row.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.epc-schedule__row.is-selected {
  background: var(--apx-forest-050);
  box-shadow: inset 3px 0 0 var(--tutorial-accent-strong);
}

.epc-schedule__index {
  display: grid;
  width: 22px;
  height: 22px;
  place-items: center;
  border-radius: 50%;
  background: var(--tutorial-accent-strong);
  color: var(--apx-white);
  font-family: var(--apx-font-mono);
  font-size: 7px;
  font-weight: 700;
}

.epc-schedule__row > span:last-child {
  display: flex;
  min-width: 0;
  flex-direction: column;
}

.epc-schedule__row strong {
  overflow: hidden;
  color: var(--tutorial-ink);
  font-family: var(--apx-font-mono);
  font-size: 9px;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.epc-schedule__row small {
  overflow: hidden;
  color: var(--tutorial-ink-soft);
  font-size: 7.5px;
  line-height: 1.4;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.epc-schedule__proof {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 8px;
  padding: 7px;
  border: 1px solid var(--apx-stock-line);
  border-radius: 2px;
  background: var(--apx-stock-bg);
  color: var(--apx-stock-fg);
}

.epc-schedule__proof > span:last-child {
  display: flex;
  flex-direction: column;
}

.epc-schedule__proof strong {
  font-family: var(--apx-font-mono);
  font-size: 7px;
  letter-spacing: 0.04em;
}

.epc-schedule__proof .sf-status-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--apx-stock-fg);
  box-shadow: 0 0 0 3px var(--apx-stock-line);
}

.epc-schedule__proof small {
  font-size: 6px;
  line-height: 1.4;
}

.tutorial-loop-wipe {
  position: absolute;
  z-index: 20;
  inset: 0;
  background:
    linear-gradient(90deg, transparent 0 35%, color-mix(in srgb, var(--apx-white) 98%, transparent) 50%, transparent 65%),
    var(--tutorial-surface);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-102%);
}

.tutorial-noscript {
  position: absolute;
  z-index: 30;
  right: 20px;
  bottom: 20px;
  left: 20px;
  margin: 0;
  padding: 12px;
  border: 1px solid var(--tutorial-line-strong);
  background: var(--apx-white);
  font-size: 12px;
}

/* 底部五步轨 —— 标签由 JS 的统一步骤配置生成。 */
.tutorial-rail {
  position: relative;
  z-index: 12;
  display: flex;
  min-width: 0;
  align-items: stretch;
  border-top: 1px solid var(--tutorial-line);
  background: var(--apx-surface);
}

.tutorial-rail ol {
  display: grid;
  min-width: 0;
  flex: 1;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.tutorial-rail li {
  position: relative;
  min-width: 0;
  padding: 0;
  border-right: 1px solid var(--tutorial-line);
  color: var(--tutorial-ink-soft);
  transition: color 0.2s var(--tutorial-ease), background-color 0.2s var(--tutorial-ease);
}

.tutorial-rail li:last-child {
  border-right: 0;
}

.tutorial-rail li.is-active {
  background: var(--apx-forest-050);
  color: var(--tutorial-accent);
}

.tutorial-rail li.is-complete:not(.is-active) {
  color: var(--tutorial-ink);
}

.tutorial-step-button {
  -webkit-appearance: none;
  appearance: none;
  display: flex;
  width: 100%;
  height: 100%;
  min-height: 46px;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0 6px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.2s var(--tutorial-ease);
}

.tutorial-step-button:hover {
  background: var(--apx-forest-050);
}

.tutorial-step-button:focus-visible {
  position: relative;
  z-index: 2;
  outline: 2px solid var(--tutorial-accent-strong);
  outline-offset: -3px;
}

.tutorial-rail b {
  display: grid;
  min-width: 34px;
  height: 18px;
  flex: 0 0 auto;
  place-items: center;
  padding-inline: 3px;
  border: 1px solid var(--tutorial-line-strong);
  border-radius: var(--apx-radius-pill);
  font-family: var(--apx-font-mono);
  font-size: 6px;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.tutorial-rail li.is-active b,
.tutorial-rail li.is-complete b {
  border-color: var(--tutorial-accent-strong);
  background: var(--tutorial-accent-strong);
  color: var(--apx-white);
}

.tutorial-rail span {
  overflow: hidden;
  font-size: 9px;
  font-weight: 600;
  line-height: 1.1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 重置段：先收拢爆炸件，再淡出场景；时间值仍由同一个 25s 时钟给出。 */
.epc-tutorial[data-phase="reset"] .drawing-zone {
  opacity: calc(1 - var(--reset-fade) * 0.9);
  transform: translateY(calc(var(--reset-fade) * 7px));
}

.epc-tutorial[data-phase="reset"] .selection-zone {
  opacity: calc(1 - var(--reset-fade) * 0.75);
}

.epc-tutorial[data-phase="reset"] .epc-schedule {
  opacity: calc(1 - var(--reset-fade));
}

@media (max-width: 560px) {
  .epc-tutorial {
    grid-template-rows: 48px minmax(0, 1fr) 46px;
  }

  .tutorial-hud__status {
    display: none;
  }

  .selection-zone {
    top: 17px;
    right: 14px;
    bottom: auto;
    left: 14px;
    width: auto;
    height: 190px;
  }

  .drawing-zone {
    top: 220px;
    right: 14px;
    bottom: 14px;
    left: 14px;
  }

  .selection-panel {
    padding: 12px;
  }

  .panel-copy {
    margin-bottom: 9px;
  }

  .brand-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .brand-option {
    justify-content: center;
    padding-inline: 5px;
  }

  .brand-option span {
    font-size: 9px;
  }

  .option-list,
  .generation-list {
    gap: 5px;
  }

  .configuration-fields {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .configuration-field:last-child {
    grid-column: auto;
  }

  .vehicle-confirm {
    margin-top: 6px;
  }

  .epc-tutorial[data-step="5"] .selection-zone {
    top: 14px;
    right: 14px;
    left: 14px;
    height: 52px;
  }

  .epc-tutorial[data-step="5"] .drawing-zone {
    top: 78px;
    right: 14px;
    bottom: 166px;
    left: 14px;
  }

  .epc-schedule {
    top: auto;
    right: 14px;
    bottom: 14px;
    left: 14px;
    width: auto;
    height: 142px;
    transform: translateY(14px);
  }

  .epc-schedule__rows {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .epc-schedule__row {
    padding: 5px 7px;
  }

  .epc-schedule__proof {
    margin-top: 4px;
    padding-block: 5px;
  }

  .epc-figure-meta {
    top: 0;
    left: 0;
    padding: 4px 6px;
  }

  .tutorial-operation {
    gap: 6px;
    padding-inline: 7px;
  }

  .tutorial-operation p {
    font-size: 8px;
  }

  .epc-tutorial[data-step="5"] .tutorial-operation {
    right: 16px;
  }

  .generation-target,
  .configuration-stamp {
    right: 0;
    bottom: 0;
  }

  .tutorial-step-button {
    justify-content: center;
    padding-inline: 3px;
  }

  .tutorial-rail span {
    display: none;
  }
}

@media (max-width: 430px) {
  .tutorial-hud {
    gap: 8px;
    padding-inline: 12px;
  }

  .tutorial-hud__eyebrow {
    display: none;
  }

  .tutorial-hud h1 {
    font-size: 13px;
  }

  .tutorial-hud__counter {
    font-size: 9px;
  }

  .selection-zone {
    height: 182px;
  }

  .drawing-zone {
    top: 210px;
  }

  .brand-option {
    gap: 4px;
  }

  .brand-option b {
    width: 21px;
    height: 21px;
    font-size: 9px;
  }

  .brand-option span {
    font-size: 8px;
  }

  .configuration-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .configuration-field:last-child {
    display: none;
  }

  .vehicle-summary {
    gap: 7px;
    padding-inline: 7px;
  }

  .vehicle-summary > span:nth-of-type(3) {
    display: none;
  }

  .vehicle-summary__badge {
    font-size: 6px;
  }

  .epc-schedule__head span:last-child,
  .epc-schedule__row small,
  .epc-schedule__proof small {
    display: none;
  }

  .epc-schedule__row {
    grid-template-columns: 21px minmax(0, 1fr);
  }
}

/*
 * Reduced motion: retain the final, most informative EPC state without translation,
 * scanning, exploding or looping. JS selects this branch and stops its RAF loop.
 */
@media (prefers-reduced-motion: reduce) {
  .epc-tutorial *,
  .epc-tutorial *::before,
  .epc-tutorial *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}