:root {
  --bg-paper: #f6f4ee;
  --bg-card: #ffffff;
  --bg-subtle: #edeae0;
  --bg-canvas: #f1efe8;
  --ink: #1b2b3c;
  --ink-muted: #4f5f70;
  --ink-soft: #6f7e8e;
  --border: #d8d3c5;
  --border-strong: #b8b19f;
  --navy: #1d354d;
  --navy-hover: #15283b;
  --amber: #b4690e;
  --amber-bg: #fbf1dc;
  --amber-border: #e5c687;
  --teal: #1f5f54;
  --teal-bg: #e2f1ed;
  --teal-border: #9ecabc;
  --coral: #b33c2f;
  --coral-bg: #fbe7e4;
  --coral-border: #e5aba3;
  --shadow-sm: 0 2px 8px rgba(27, 43, 60, 0.06);
  --shadow-md: 0 10px 28px rgba(27, 43, 60, 0.11);
  --shadow-lg: 0 18px 44px rgba(27, 43, 60, 0.16);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

button, input, select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

/* Top Banner (Ribbon Workshop style) */
.top-banner {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 24px;
  background: rgba(246, 244, 238, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.brand-cluster {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.brand-crest {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.brand-meta {
  padding-left: 16px;
  border-left: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.35;
  letter-spacing: 0.07em;
  color: var(--ink-muted);
  text-transform: uppercase;
}

.banner-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.lens-pill-group {
  display: inline-flex;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px;
}

.lens-btn {
  border: none;
  background: transparent;
  padding: 5px 11px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.lens-btn[aria-pressed="true"] {
  background: var(--navy);
  color: #ffffff;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.btn:hover {
  background: var(--bg-subtle);
  border-color: var(--ink-muted);
}

.btn-primary {
  background: var(--navy);
  border-color: var(--navy);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--navy-hover);
  border-color: var(--navy-hover);
}

.btn-amber {
  background: var(--amber-bg);
  border-color: var(--amber-border);
  color: #7c4605;
}

.btn-teal {
  background: var(--teal-bg);
  border-color: var(--teal-border);
  color: var(--teal);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #9aa5b1;
  display: inline-block;
}

.status-dot.live {
  background: #23886d;
  box-shadow: 0 0 0 3px rgba(35, 136, 109, 0.2);
}

/* Exploration & Garden Ambience Strip */
.explore-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 24px;
  background: #efede5;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.explore-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.strip-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.mode-btn {
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}

.mode-btn[aria-pressed="true"] {
  background: var(--navy);
  border-color: var(--navy);
  color: #ffffff;
}

.lens-callout-banner {
  font-size: 0.82rem;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.lens-callout-banner strong {
  color: var(--ink);
}

/* Expandable Garden Ambience Drawer */
.garden-drawer {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  box-shadow: var(--shadow-sm);
}

.garden-drawer[hidden] {
  display: none;
}

.garden-grid {
  display: grid;
  grid-template-columns: 1.2fr 2fr 1fr;
  gap: 20px;
  align-items: start;
}

.stem-sliders {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(175px, 1fr));
  gap: 12px;
}

.stem-card {
  background: var(--bg-paper);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}

.stem-card label {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.stem-card input[type="range"] {
  width: 100%;
  accent-color: var(--navy);
}

/* Main Workshop Shell */
.workshop-shell {
  display: grid;
  grid-template-columns: 256px minmax(0, 1fr);
  min-height: calc(100vh - 106px);
}

/* Left Chapter Rail */
.chapter-rail {
  border-right: 1px solid var(--border);
  padding: 20px 14px 110px 16px;
  background: var(--bg-paper);
  position: sticky;
  top: 58px;
  height: calc(100vh - 58px);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
}

.rail-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin: 0 8px 10px;
}

.chapter-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chapter-btn {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  align-items: center;
  gap: 8px;
  width: 100%;
  text-align: left;
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  color: var(--ink);
  font-size: 0.86rem;
  font-weight: 500;
  transition: background 0.14s ease;
}

.chapter-btn:hover {
  background: var(--bg-subtle);
}

.chapter-btn.active {
  background: var(--navy);
  color: #ffffff;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  opacity: 0.72;
}

.chapter-arrow {
  font-size: 0.78rem;
  opacity: 0.75;
}

.pretest-box {
  margin: 8px 6px 0;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.pretest-header {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin-bottom: 6px;
}

.pretest-bar {
  height: 5px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 8px;
}

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

.pretest-motto {
  margin-top: 8px;
  font-size: 0.77rem;
  line-height: 1.45;
  color: var(--ink);
}

/* Main Stage */
.stage-main {
  padding: 28px 32px 130px;
  max-width: 1440px;
  width: 100%;
}

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

.chapter-kicker {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--amber);
  font-weight: 600;
  margin-bottom: 6px;
}

.chapter-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  line-height: 1.18;
  margin: 0 0 8px;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.chapter-lead {
  margin: 0;
  max-width: 780px;
  color: var(--ink-muted);
  font-size: 0.98rem;
}

.chapter-StepCounter {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  white-space: nowrap;
  padding-top: 4px;
}

/* Workbench Split Layout (Viewport + Right Inspector) */
.workbench-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) 360px;
  gap: 22px;
  align-items: start;
}

.panel-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.panel-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 14px;
  background: #faf9f5;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.tab-strip {
  display: inline-flex;
  gap: 4px;
  flex-wrap: wrap;
}

.subtab-btn {
  padding: 6px 11px;
  border-radius: 6px;
  border: 1px solid transparent;
  background: transparent;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
}

.subtab-btn:hover {
  background: var(--bg-subtle);
  color: var(--ink);
}

.subtab-btn.active {
  background: #e3ece9;
  border-color: #b7d2ca;
  color: #16443c;
}

.canvas-stage {
  position: relative;
  background: var(--bg-canvas);
  width: 100%;
  overflow: hidden;
}

.canvas-stage canvas {
  display: block;
  width: 100%;
  height: auto;
  cursor: grab;
}

.canvas-stage canvas:active {
  cursor: grabbing;
}

.canvas-overlay-top {
  position: absolute;
  top: 12px;
  left: 14px;
  right: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  gap: 10px;
}

.canvas-badge {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.canvas-cam-btns {
  pointer-events: auto;
  display: inline-flex;
  gap: 5px;
}

.mini-btn {
  padding: 4px 9px;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.92);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

.mini-btn:hover {
  background: #ffffff;
}

.canvas-overlay-bottom {
  position: absolute;
  bottom: 10px;
  left: 14px;
  right: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.controls-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(185px, 1fr));
  gap: 14px;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  background: #fcfbf8;
  align-items: end;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  margin-bottom: 5px;
}

.control-group input[type="range"] {
  width: 100%;
  accent-color: var(--navy);
}

.control-group input[type="number"],
.control-group select {
  width: 100%;
  padding: 6px 9px;
  border-radius: 6px;
  border: 1px solid var(--border-strong);
  background: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

/* Part Selector Pill Matrix (Ribbon Workshop M01..E01 style) */
.part-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}

.part-pill {
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #faf9f5;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  cursor: pointer;
  transition: all 0.12s ease;
}

.part-pill:hover {
  border-color: var(--ink-muted);
  background: var(--bg-subtle);
}

.part-pill.selected {
  border-color: var(--navy);
  background: var(--navy);
  color: #ffffff;
  font-weight: 600;
}

.part-pill.verified {
  border-left: 4px solid #23886d;
}

/* Right Component / Landmark Inspector */
.inspector-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}

.inspector-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.inspector-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.inspector-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 5px;
  border: 1px solid var(--border);
  background: var(--bg-paper);
}

.inspector-code {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--coral);
  font-weight: 600;
  margin-bottom: 4px;
}

.inspector-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  margin: 0 0 8px;
  line-height: 1.22;
}

.inspector-desc {
  margin: 0 0 14px;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.spec-dl {
  margin: 0 0 16px;
  border-top: 1px solid var(--border);
}

.spec-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.83rem;
}

.spec-row dt {
  color: var(--ink-muted);
}

.spec-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  text-align: right;
}

.pretest-callout {
  background: #edf4f2;
  border: 1px solid #c5ddd6;
  border-radius: 8px;
  padding: 12px;
  font-size: 0.82rem;
  margin-top: 14px;
}

/* Metric Strip & Cards */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 13px 15px;
}

.kpi-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
}

.kpi-val {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 700;
  margin: 4px 0 2px;
  color: var(--ink);
}

.kpi-sub {
  font-size: 0.78rem;
  color: var(--ink-muted);
}

/* Data Tables & Pitch Comparison */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-muted);
  background: #faf9f5;
}

/* Chapter Footer Nav */
.chapter-footer {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-motto {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

/* Floating Walkthrough Bar & Apis Karakuri Companion Dock */
.companion-dock {
  position: fixed;
  right: 20px;
  bottom: 18px;
  z-index: 60;
  display: flex;
  align-items: flex-end;
  gap: 12px;
}

.walkthrough-pill {
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid var(--border-strong);
  border-radius: 14px;
  padding: 10px 14px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 470px;
}

.walkthrough-pill[hidden] {
  display: none;
}

.wt-play-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--navy);
  background: var(--navy);
  color: #ffffff;
  font-size: 0.85rem;
  cursor: pointer;
  flex-shrink: 0;
}

.wt-info {
  min-width: 0;
  flex: 1;
}

.wt-title {
  font-size: 0.83rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.wt-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.apis-launcher {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px 7px 9px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: #ffffff;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.apis-launcher:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.apis-avatar {
  width: 46px;
  height: 46px;
  animation: gentleHover 3.4s ease-in-out infinite;
}

@keyframes gentleHover {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-3px) rotate(1.5deg); }
}

.apis-launcher-text {
  text-align: left;
}

.apis-launcher-title {
  display: block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.92rem;
  line-height: 1.15;
}

.apis-launcher-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--amber);
}

/* Expanded Apis Companion Panel */
.apis-panel {
  position: fixed;
  right: 20px;
  bottom: 84px;
  width: 430px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 150px);
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  z-index: 65;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.apis-panel[hidden] {
  display: none;
}

.apis-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: #faf7ef;
  border-bottom: 1px solid var(--border);
}

.apis-header-id {
  display: flex;
  align-items: center;
  gap: 10px;
}

.apis-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--border);
  background: var(--bg-paper);
}

.apis-tab {
  padding: 9px 8px;
  border: none;
  background: transparent;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.apis-tab.active {
  color: var(--navy);
  border-bottom-color: var(--navy);
  background: #ffffff;
}

.apis-body {
  padding: 15px 16px;
  overflow-y: auto;
  flex: 1;
}

/* Kokechan-style Rung 0 -> 4 Altitude Selector */
.rung-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 4px;
  margin-bottom: 12px;
}

.rung-btn {
  padding: 6px 4px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-paper);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-align: center;
  cursor: pointer;
}

.rung-btn.active {
  background: var(--amber-bg);
  border-color: var(--amber);
  color: #703e03;
  font-weight: 700;
}

.speech-bubble {
  background: #faf8f2;
  border: 1px solid var(--border);
  border-left: 4px solid var(--amber);
  border-radius: 10px;
  padding: 13px 14px;
  font-size: 0.89rem;
  line-height: 1.58;
  color: var(--ink);
  margin-bottom: 12px;
}

.qa-chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.qa-chip {
  padding: 5px 10px;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: #faf9f5;
  font-size: 0.77rem;
  cursor: pointer;
  text-align: left;
}

.qa-chip:hover {
  background: var(--amber-bg);
  border-color: var(--amber-border);
}

/* Responsive adjustments */
@media (max-width: 1120px) {
  .workbench-grid {
    grid-template-columns: 1fr;
  }
  .garden-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .workshop-shell {
    grid-template-columns: 1fr;
  }
  .chapter-rail {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding-bottom: 16px;
  }
  .stage-main {
    padding: 20px 16px 130px;
  }
}