:root {
  color-scheme: dark;
  --background: #0b101b;
  --panel: #131d2d;
  --border: #2d3a51;
  --text: #f0f4ff;
  --body: #ccd6e7;
  --muted: #a4b3ca;
  --accent: #c3b3ff;
  --green: #92e5c6;
  --gold: #efbe8c;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: Inter, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--background);
  color: var(--text);
  font: 14px/1.5 var(--sans);
}
button, input { font: inherit; }
button { color: inherit; cursor: pointer; }
button:disabled { opacity: .46; cursor: default; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, summary:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
h2, h3, p, pre { margin: 0; }
code, pre { font-family: var(--mono); }

.noscript { margin: 0; padding: 12px 16px; background: #2b2b49; color: var(--text); text-align: center; }
.not-found { align-items: center; justify-content: center; text-align: center; padding: 24px; }
.not-found main { display: grid; justify-items: center; gap: 12px; }
.not-found img { border-radius: 14px; }
.not-found h1 { margin: 6px 0 0; font-size: 26px; letter-spacing: -.02em; }
.not-found p { color: var(--body); font-size: 15px; }
.not-found .run-button { margin-top: 8px; text-decoration: none; }

.topbar {
  display: flex;
  min-height: 54px;
  align-items: center;
  justify-content: space-between;
  gap: 8px 18px;
  padding: 8px clamp(12px, 2vw, 28px);
  border-bottom: 1px solid #222e43;
  background: #101827;
}
.identity, .toolbar { display: flex; align-items: center; gap: 8px; min-width: 0; }
.identity img { flex: none; border-radius: 7px; }
.brand { font-size: 14px; font-weight: 760; white-space: nowrap; }
.repo-name {
  color: var(--muted);
  border-left: 1px solid var(--border);
  padding-left: 12px;
  margin-left: 6px;
  font: 11px var(--mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tool, .icon-button, .text-button, .view-tools button {
  border: 1px solid transparent;
  background: transparent;
  border-radius: 7px;
  color: var(--body);
}
.tool {
  min-height: 34px;
  padding: 5px 9px;
  font-size: 12px;
  white-space: nowrap;
}
.tool > span { color: var(--accent); font: 12px var(--mono); margin-right: 3px; }
.tool:hover, .tool[aria-expanded="true"], .icon-button:hover, .text-button:hover:not(:disabled), .view-tools button:hover {
  border-color: var(--border);
  color: var(--text);
  background: #24304a;
}
.icon-button { width: 34px; height: 34px; flex: none; font-size: 21px; line-height: 1; }
.text-button { min-height: 34px; padding: 4px 7px; font-size: 12px; }

#workspace {
  --edge: clamp(12px, 2vw, 28px);
  --dock-space: 108px;
  --dock-rise: 20px;
  --drawer-width: min(352px, 39vw);
  position: relative;
  isolation: isolate;
  flex: 1;
  min-height: 450px;
  background:
    radial-gradient(ellipse at 47% 46%, #1a2942 0%, #121c30 42%, #0b111d 82%);
}
#workspace::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(#9eb5ef27 1px, transparent 1px) 0 0 / 27px 27px;
  mask-image: linear-gradient(to bottom, #000, transparent 56%, #0006);
}
/* The dock grows by a row of stages while a stage map is open. */
#workspace[data-view="stage"] { --dock-rise: 54px; }
.scene-frame {
  position: absolute;
  inset: 0 0 calc(80px + var(--dock-rise));
}
#workspace[data-open-panel]:not([data-open-panel=""]) .scene-frame {
  right: calc(var(--drawer-width) + var(--edge));
}
#scene {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
  user-select: none;
}
#scene.orbiting, .orbiting .station-node { cursor: grabbing; }
.grid-line { stroke: #819cd5; stroke-width: 1; opacity: .20; }
.network-divider { stroke: #9d9df6; stroke-width: 1.5; stroke-dasharray: 3 9; opacity: .4; }
.station-link { stroke: #829bcf; stroke-width: 1.5; opacity: .62; stroke-dasharray: 3 8; }
.live-route { fill: none; stroke: #d3c6ff; stroke-width: 2; stroke-dasharray: 5 7; opacity: .94; }
.packet { fill: #fff2ff; filter: drop-shadow(0 0 8px #d2b5ff); pointer-events: none; }
.station-node { cursor: pointer; outline: none; }
.station-glow { fill: var(--tone); opacity: .13; filter: blur(17px); transition: opacity .2s; }
.station-base polygon { stroke: #728cb8; stroke-opacity: .44; stroke-width: 1; stroke-linejoin: round; }
.station-object { filter: drop-shadow(0 9px 10px #080c18aa); transition: transform .2s ease-out, filter .2s ease-out, opacity .2s; }
.station-object polygon { stroke: var(--glint); stroke-opacity: .64; stroke-width: 1; stroke-linejoin: round; }
.object-line { stroke: #162334; stroke-width: 2; stroke-linecap: round; opacity: .58; }
.dormant .station-object { opacity: .46; }
.station-node.highlighted .station-object, .station-node:focus-visible .station-object {
  opacity: 1;
  transform: translateY(-7px);
  filter: drop-shadow(0 6px 16px var(--dim));
}
.station-node.highlighted .station-glow, .station-node.touched .station-glow { opacity: .31; }
.station-leader { stroke: #a4b6d6; opacity: .6; stroke-width: 1; stroke-dasharray: 2 4; }
.node-label { fill: #131d2eea; stroke: #455572; stroke-width: 1; }
.station-node.highlighted .node-label, .station-node:focus-visible .node-label { stroke: var(--tone); fill: #1e2b40; }
.node-title, .node-status { text-anchor: middle; pointer-events: none; }
.node-title { fill: var(--text); font: 680 13px var(--sans); }
.node-status { fill: #b4c5df; font: 10px var(--mono); }
.station-hit { fill: transparent; }
.map-caption, .view-tools { position: absolute; top: 14px; }
.map-caption {
  left: var(--edge);
  display: flex;
  align-items: center;
  gap: 7px;
  min-height: 36px;
  color: var(--muted);
  font: 11px var(--mono);
  pointer-events: none;
}
.map-caption i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 10px #92e5c67a;
}
.view-tools {
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: #131d2de8;
}
#workspace[data-open-panel]:not([data-open-panel=""]) .view-tools {
  left: calc((100% - var(--drawer-width) - var(--edge)) / 2);
}
.view-tools button { width: 32px; height: 28px; padding: 0; font: 17px var(--mono); }
.view-tools > span { width: 1px; height: 15px; margin: 0 2px; background: var(--border); }
.map-tooltip {
  position: absolute;
  z-index: 1;
  transform: translateX(-50%);
  pointer-events: none;
  width: min(240px, calc(100% - 20px));
  padding: 9px 11px;
  border: 1px solid #4b5d7c;
  border-radius: 8px;
  background: #141f32;
  box-shadow: 0 6px 20px #070c18a6;
  color: var(--body);
  font-size: 12px;
}
.map-tooltip strong { display: block; color: var(--text); margin-bottom: 3px; }

.step-dock {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: min(610px, calc(100% - 24px));
}
.dock-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: stretch;
  padding: 5px;
  border: 1px solid #48577a;
  border-radius: 12px;
  background: #182338;
  box-shadow: 0 12px 34px #05091194;
}
.step-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex: 1 1 0;
  min-width: 0;
  text-align: left;
  padding: 5px 9px;
  gap: 8px;
  color: var(--body);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 7px;
}
.step-toggle:hover, .step-toggle[aria-expanded="true"] { background: #25324c; border-color: var(--border); }
.step-toggle-text { display: grid; gap: 2px; min-width: 0; }
.dock-lesson, .step-toggle code { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dock-lesson { font-size: 11px; color: var(--muted); }
.step-toggle code { color: var(--text); font-size: 13px; }
.step-toggle-icon { color: var(--accent); font-size: 18px; }
.step-toggle[aria-expanded="true"] .step-toggle-icon { transform: rotate(180deg); }
.run-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex: none;
  gap: 6px;
  min-height: 36px;
  padding: 6px 12px;
  border: 1px solid #dacdff;
  border-radius: 7px;
  background: #c3b3ff;
  color: #17122b;
  font-size: 13px;
  font-weight: 750;
}
.run-button:hover { background: #ded3ff; }
.run-button.playing { background: #25324c; border-color: #8477ac; color: var(--text); }
.run-button.playing:hover { background: #2f3d5c; }
.dock-actions { flex: none; display: flex; gap: 6px; }
.dock-restart {
  flex: none;
  padding: 6px 9px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: transparent;
  color: var(--body);
  font-size: 12px;
  white-space: nowrap;
}
.dock-restart:hover { background: #25324c; color: var(--text); }
.dock-restart > span:first-child { color: var(--accent); }

/* Step scrubber: one segment per step. Selecting a segment runs the lesson from that step. */
.dock-steps { flex: 0 0 100%; display: flex; gap: 3px; padding: 0 3px; }
.dock-steps button {
  flex: 1;
  min-width: 0;
  height: 14px;
  padding: 5px 0;
  border: 0;
  border-radius: 3px;
  background: transparent;
}
.dock-steps button::before {
  content: "";
  display: block;
  height: 4px;
  border-radius: 2px;
  background: #303c53;
  transition: background .2s, box-shadow .2s;
}
.dock-steps b, .dock-steps span { display: none; }
.dock-steps button:hover::before { background: #56658a; }
.dock-steps .done::before { background: #69c6ac; }
.dock-steps .now::before { background: var(--accent); }
.dock-steps .target::before { box-shadow: 0 0 0 1.5px var(--accent); }
.dock-steps button { position: relative; }
/* While a run plays, the step on show fills up over the time it is given. */
.dock-steps.playing .now::before { background: #4b456f; }
.dock-steps.playing .now::after {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--accent);
  transform-origin: left;
  animation: dock-progress var(--step-time, 5s) linear var(--step-elapsed, 0s) both;
}
@keyframes dock-progress { from { transform: scaleX(0); } }

/* The command types itself while a run is playing. */
.step-toggle code.typing { text-overflow: clip; border-right: 2px solid var(--accent); }
@keyframes dock-type { from { max-width: 0; } }

/* Stage row: every stage of the repository, with a packet that follows the running step. */
.dock-flow {
  position: relative;
  flex: 0 0 100%;
  display: flex;
  align-items: center;
  gap: 3px;
  min-width: 0;
}
.flow-stop {
  flex: none;
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 28px;
  padding: 3px 9px 3px 7px;
  border: 1px solid transparent;
  border-radius: 99px;
  background: transparent;
  color: var(--body);
  font-size: 11.5px;
  white-space: nowrap;
}
.flow-stop:hover { background: #25324c; color: var(--text); }
.flow-stop i {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--station-color) 45%, #182338);
  border: 1.5px solid var(--station-color);
  transition: background .25s, box-shadow .25s;
}
.flow-stop .short { display: none; }
.flow-stop[aria-current] {
  border-color: color-mix(in srgb, var(--station-color) 70%, #48577a);
  background: color-mix(in srgb, var(--station-color) 13%, #182338);
  color: var(--text);
  font-weight: 650;
}
.flow-stop.lit { color: var(--text); }
.flow-stop.lit i { background: var(--station-color); box-shadow: 0 0 9px 1px var(--station-color); animation: flow-ping .8s ease-out; }
.flow-stop.lit.risk i { background: #ffb09f; border-color: #ffb09f; box-shadow: 0 0 9px 1px #ffb09f; }
.flow-stop.lit.safe i { background: #9decc6; border-color: #9decc6; box-shadow: 0 0 9px 1px #9decc6; }
@keyframes flow-ping { 0% { transform: scale(1); } 35% { transform: scale(1.9); } 100% { transform: scale(1); } }
.flow-link { flex: 1 1 8px; min-width: 6px; border-top: 1.5px dashed #48577a; }
.flow-packet {
  position: absolute;
  left: 0;
  top: 50%;
  width: 9px;
  height: 9px;
  margin: -4.5px 0 0 -4.5px;
  border-radius: 50%;
  background: #fff2ff;
  box-shadow: 0 0 10px 2px #d2b5ff;
  opacity: 0;
  pointer-events: none;
}
.flow-packet[data-tone="risk"] { box-shadow: 0 0 10px 2px #ffb09f; }
.flow-packet[data-tone="safe"] { box-shadow: 0 0 10px 2px #9decc6; }
.map-feedback {
  width: max-content;
  max-width: 100%;
  padding: 1px 11px;
  margin: 0 auto 5px;
  border-radius: 99px;
  background: #0f1726d9;
  color: var(--green);
  font: 11px/1.5 var(--mono);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.map-feedback:empty { display: none; }
.warning-text, .warning-log { color: var(--gold); }

.drawer {
  position: absolute;
  z-index: 2;
  display: flex;
  flex-direction: column;
  top: 14px;
  bottom: calc(var(--dock-space) + var(--dock-rise));
  right: var(--edge);
  width: var(--drawer-width);
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: #131d2df7;
  border: 1px solid #3a4b68;
  border-radius: 11px;
  box-shadow: 0 12px 32px #060b14a1;
}
.drawer:not(.terminal-panel) {
  height: max-content;
  max-height: calc(100% - var(--dock-space) - var(--dock-rise) - 14px);
}
.panel-header {
  flex: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 10px 13px;
  min-height: 56px;
  border-bottom: 1px solid var(--border);
}
.panel-header h2 { font-size: 16px; letter-spacing: -.025em; }
.panel-header p { color: var(--muted); font: 11px/1.4 var(--mono); margin-top: 3px; }
.panel-actions { display: flex; align-items: center; gap: 4px; }
.drawer-content { min-height: 0; padding: 12px 13px; overflow: auto; }
.progress-track { height: 4px; margin: 1px 0 11px; background: #283650; border-radius: 8px; overflow: hidden; }
#progress-fill { height: 100%; background: var(--green); transition: width .3s; }
#lessons { display: grid; gap: 4px; }
.lesson-link {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) 9px;
  align-items: center;
  gap: 8px;
  padding: 8px 6px;
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 7px;
}
.lesson-link:hover { background: #202b43; }
.lesson-link.current { background: #2b2b49; border-color: #655d8e; }
.lesson-number {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: #222e44;
  color: var(--body);
  font: 10px var(--mono);
}
.current .lesson-number { background: var(--accent); color: #211935; font-weight: 750; }
.lesson-number.finished { background: #214036; color: var(--green); }
.lesson-link-copy strong, .lesson-link-copy small { display: block; }
.lesson-link-copy strong { font-size: 13px; }
.lesson-link-copy small { color: var(--muted); font-size: 11px; }
.lesson-chevron { color: var(--accent); }

.lesson-intro, .step-content > p { color: var(--body); font-size: 13px; }
.step-content { margin-top: 13px; }
.step-label { color: var(--accent); font: 10px var(--mono); letter-spacing: .07em; }
.complete-label { color: var(--green); }
.step-meter { display: flex; gap: 3px; margin: 7px 0 11px; }
.step-meter span { flex: 1; background: #303c53; height: 3px; border-radius: 2px; }
.step-meter span.done { background: #69c6ac; }
.step-meter span.now { background: var(--accent); }
.step-content h3 { font-size: 15px; margin-bottom: 5px; }
.command-preview {
  padding: 8px;
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #0f1827;
  color: var(--accent);
  overflow-wrap: anywhere;
}
.command-preview > span { color: var(--green); }
.step-content .run-button { width: 100%; margin-top: 8px; }
.step-note {
  display: flex;
  gap: 7px;
  padding: 9px;
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: #1d2940;
  color: var(--body);
  font-size: 12px;
}
.step-note > span, .step-note strong { color: var(--accent); }
.step-note strong { display: block; margin-bottom: 3px; font: 10px var(--mono); }
.lesson-footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.choices { display: grid; gap: 6px; margin-top: 9px; }
.choices button {
  padding: 8px;
  text-align: left;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #1b263a;
  color: var(--body);
  font-size: 12px;
}
.choices button:hover { border-color: var(--accent); color: var(--text); }
.step-content .feedback { color: var(--gold); margin-top: 6px; }

#station-data { margin: 10px 0; }
.file-row { border-top: 1px solid var(--border); }
.file-row summary { cursor: pointer; padding: 7px 1px; font-size: 12px; color: var(--body); overflow-wrap: anywhere; }
.file-icon { color: var(--accent); margin: 0 3px; }
.file-status {
  margin-left: 6px;
  color: var(--accent);
  background: #2a2c48;
  border-radius: 4px;
  padding: 2px 4px;
  font: 9px var(--mono);
}
.file-row pre, .guide-group pre {
  color: var(--body);
  background: #0f1726;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 7px;
  margin-bottom: 5px;
  font-size: 11px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.empty, .ref-caption, .pr-banner { padding: 6px 0; }
.empty { color: var(--muted); font-size: 12px; }
.empty.warning-text { color: var(--gold); }
.ref-caption, .pr-banner { color: var(--green); font: 11px var(--mono); }
.pr-banner { color: var(--accent); }
.history-graph { display: flex; min-width: 0; }
.history-graph svg { flex: none; overflow: visible; }
.history-graph path { stroke: #ac9ae2; stroke-width: 1.6; fill: none; }
.history-graph circle { fill: var(--green); stroke: #182a2d; stroke-width: 1; }
.commit-list { min-width: 0; flex: 1; }
.commit-row { height: 46px; padding: 4px 0 2px; border-bottom: 1px solid var(--border); }
.commit-row div { display: flex; align-items: baseline; gap: 6px; font-size: 12px; }
.commit-row code { flex: none; font-size: 10px; color: var(--green); }
.commit-row span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.commit-row small { display: block; color: var(--accent); font: 9px/1.35 var(--mono); overflow-wrap: anywhere; }
.remote-files { margin-top: 8px; font-size: 12px; color: var(--muted); }
.remote-files > summary { cursor: pointer; }
.station-actions { display: flex; flex-wrap: wrap; gap: 5px; }
.station-actions .tool { border-color: var(--border); background: #1c2940; white-space: normal; }

.terminal-log {
  min-height: 0;
  flex: 1 1 auto;
  overflow: auto;
  padding: 10px 12px;
  font: 11px/1.6 var(--mono);
  color: var(--body);
}
.log-entry { margin-bottom: 8px; }
.log-entry:last-child { margin-bottom: 0; }
.log-entry pre { white-space: pre-wrap; overflow-wrap: anywhere; font: inherit; }
.log-command { color: var(--green); margin-bottom: 2px; overflow-wrap: anywhere; }
.system-log { color: var(--muted); }
.terminal-form {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px;
  border-top: 1px solid var(--border);
  font: 12px var(--mono);
  color: var(--green);
}
.terminal-form input {
  flex: 1;
  width: 0;
  padding: 8px 2px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--text);
}
.terminal-form input::placeholder { color: var(--muted); }
.terminal-form button {
  border: 1px solid #39554b;
  border-radius: 5px;
  padding: 5px 8px;
  background: #1d2e29;
  color: var(--green);
}
.terminal-form button:hover { background: #2b453b; }

.guide {
  width: min(700px, calc(100% - 24px));
  max-height: min(84dvh, 740px);
  padding: 0;
  border: 1px solid #465675;
  border-radius: 11px;
  background: var(--panel);
  color: var(--text);
}
.guide::backdrop { background: #070b16bb; backdrop-filter: blur(4px); }
.guide > header { position: sticky; top: 0; z-index: 1; background: #1c283e; }
.guide-body { padding: 12px 15px 15px; }
.guide-tabs { display: flex; gap: 6px; }
.guide-tabs button {
  padding: 6px 10px;
  border: 1px solid var(--border);
  background: #182337;
  border-radius: 6px;
  color: var(--body);
  font-size: 12px;
}
.guide-tabs button[aria-pressed="true"] { border-color: #8477ac; background: #2e2d4b; color: var(--accent); }
.guide-intro { color: var(--body); margin: 10px 0; font-size: 13px; }
.guide-group { margin-top: 10px; padding: 9px 0 0; border-top: 1px solid var(--border); }
.guide-group h3 { font-size: 13px; margin-bottom: 5px; color: var(--accent); }
.guide-group dl { margin: 0; }
.guide-group dt { padding-top: 8px; color: var(--green); font-size: 12px; overflow-wrap: anywhere; }
.guide-group dd, .guide-group p { margin: 3px 0 6px; color: var(--body); font-size: 12px; }
.guide-group .do, .guide-group .avoid { display: inline-block; min-width: 40px; }
.guide-group .do { color: var(--green); }
.guide-group .avoid { color: var(--gold); }
.sources a { display: inline-block; color: var(--accent); font-size: 12px; margin-right: 12px; }

/* In a stage map the breadcrumb takes the left of the top bar, so the view tools move right. */
#workspace .map-breadcrumb:not([hidden]) ~ .view-tools { left: auto; right: var(--edge); transform: none; }
#workspace[data-open-panel]:not([data-open-panel=""]) .map-breadcrumb:not([hidden]) ~ .view-tools {
  right: calc(var(--drawer-width) + var(--edge) + 12px);
}
@media (min-width: 761px) and (max-width: 1060px) {
  #workspace[data-open-panel]:not([data-open-panel=""]) .view-tools {
    left: auto;
    right: calc(var(--drawer-width) + var(--edge) + 12px);
    transform: none;
  }
}
@media (max-width: 760px) {
  #workspace { --dock-space: 102px; }
  .repo-name { display: none; }
  #workspace[data-open-panel]:not([data-open-panel=""]) .scene-frame { right: 0; }
  .view-tools, #workspace[data-open-panel]:not([data-open-panel=""]) .view-tools {
    left: auto;
    right: var(--edge);
    transform: none;
  }
  .drawer {
    top: auto;
    left: var(--edge);
    width: auto;
    height: min(39dvh, 300px);
  }
  .drawer:not(.terminal-panel) { max-height: min(44dvh, 360px); }
  .terminal-form input { font-size: 16px; }
  #workspace .map-breadcrumb:not([hidden]) ~ .view-tools,
  #workspace[data-open-panel]:not([data-open-panel=""]) .map-breadcrumb:not([hidden]) ~ .view-tools { top: 58px; right: var(--edge); }
  #station-panel { height: auto; max-height: min(50dvh, 430px); }
  #station-title { font-size: 18px; }
  #station-info { font-size: 15px; }
}
@media (max-width: 640px) {
  .flow-stop { padding: 3px 6px 3px 5px; gap: 5px; font-size: 11px; }
  .flow-stop .long { display: none; }
  .flow-stop .short { display: inline; }
  .dock-restart { padding-inline: 7px; }
  .run-button { padding-inline: 9px; font-size: 12.5px; }
}
@media (max-width: 420px) {
  .dock-flow { gap: 1px; }
  .flow-stop { padding: 3px 5px 3px 4px; gap: 4px; font-size: 10.5px; }
  .flow-link { flex-basis: 3px; min-width: 3px; }
  .topbar { flex-wrap: wrap; }
  .identity, .toolbar { gap: 3px; }
  .identity img { width: 22px; height: 22px; }
  .brand { font-size: 11px; }
  .tool { padding-inline: 5px; font-size: 11px; }
  .tool > span { display: none; }
  .map-caption { font-size: 10px; }
  .view-tools button { width: 28px; height: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
  .packet { display: none; }
}

.map-breadcrumb {
  position: absolute;
  z-index: 1;
  top: 14px;
  left: var(--edge);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px 11px;
  max-width: calc(100% - 2 * var(--edge));
  color: var(--text);
  font-size: 13px;
  font-weight: 650;
}
.map-breadcrumb .tool { border-color: var(--border); background: #131d2d; }
.map-breadcrumb .tool:hover { background: #24304a; }
.stage {
  --tone: #c3b3ff;
  position: absolute;
  inset: 0;
  overflow: hidden;
  animation: stage-in .3s ease-out both;
}
.stage canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
  user-select: none;
}
.stage.orbiting canvas { cursor: grabbing; }
.stage.leaving { pointer-events: none; }
.stage-chips { position: absolute; inset: 0; pointer-events: none; }
.stage-chip {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 236px;
  padding: 5px 11px 5px 5px;
  border: 1px solid #455572;
  border-radius: 10px;
  background: #131d2eeb;
  color: var(--text);
  text-align: left;
  white-space: nowrap;
  visibility: hidden;
  opacity: 0;
  pointer-events: auto;
  will-change: transform, opacity;
  transition: background .15s, border-color .15s, box-shadow .15s;
}
.stage.orbiting .stage-chip, .stage.leaving .stage-chip { pointer-events: none; }
.stage-chip b {
  flex: none;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: color-mix(in srgb, var(--tone) 20%, #152032);
  color: var(--tone);
  font: 700 14px var(--mono);
}
.stage-chip.first { max-width: 270px; padding: 6px 13px 6px 6px; border-color: color-mix(in srgb, var(--tone) 55%, #455572); }
.stage-chip.first b { width: 34px; height: 34px; background: var(--tone); color: #101827; font-size: 17px; }
.stage-chip.first strong { font-size: 15px; }
.stage-chip.active { max-width: 340px; padding: 7px 15px 7px 7px; }
.stage-chip.active b { width: 38px; height: 38px; font-size: 19px; }
.stage-chip.active strong { font-size: 18px; }
.stage-chip.active small { font-size: 12px; }
.stage.solo .stage-chip:not(.active) { pointer-events: none; }
.stage-home {
  position: absolute;
  top: 0;
  left: 0;
  padding: 3px 10px;
  border: 1px solid #455572;
  border-radius: 99px;
  background: #131d2eeb;
  color: var(--body);
  z-index: 300;
  font: 11px var(--mono);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  will-change: transform, opacity;
  box-shadow: 0 6px 18px -6px #060b14;
}
.stage-home:is(:focus-visible, .hot) { border-color: var(--tone); background: #1e2b40; color: var(--text); }
.stage-chip > span { min-width: 0; }
.stage-chip strong { display: block; font: 660 13px/1.25 var(--sans); }
.stage-chip small {
  display: block;
  overflow: hidden;
  color: var(--muted);
  font: 10px/1.4 var(--mono);
  text-overflow: ellipsis;
}
.stage-chip:is(:hover, :focus-visible, .hot, .active, .ran) {
  border-color: var(--tone);
  background: #1e2b40;
  box-shadow: 0 8px 26px -10px var(--tone);
}
.stage-chip.active b { background: var(--tone); color: #101827; }
.stage.compact .stage-chip { gap: 6px; padding: 4px 9px 4px 4px; }
.stage.compact .stage-chip small { display: none; }
.stage.compact .stage-chip b { width: 24px; height: 24px; font-size: 13px; }
.stage.compact .stage-chip strong { font-size: 12px; }
.stage.compact .stage-chip.first b { width: 28px; height: 28px; font-size: 15px; }
.stage.compact .stage-chip.first strong { font-size: 13.5px; }
.stage.compact .stage-chip.active b { width: 32px; height: 32px; font-size: 17px; }
.stage.compact .stage-chip.active strong { font-size: 16px; }
/* The running command, written large under the number of the section in focus. */
.stage-command {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: 250;
  width: max-content;
  max-width: min(600px, calc(100% - 28px));
  padding: 9px 16px 11px;
  border: 1px solid color-mix(in srgb, var(--tone) 55%, #455572);
  border-radius: 11px;
  background: #0d1522f0;
  box-shadow: 0 12px 34px -14px var(--tone);
  pointer-events: none;
  will-change: transform;
}
.stage-command small {
  display: block;
  margin-bottom: 4px;
  color: var(--tone);
  font: 10.5px var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.stage-command[data-state="paused"] small { color: var(--muted); }
.stage-command[data-state="done"] small { color: var(--green); }
.stage-command[data-state="warning"] small { color: var(--gold); }
.stage-command code {
  display: block;
  color: var(--text);
  font: 16px/1.45 var(--mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.stage-command code i { color: var(--green); font-style: normal; }
/* Each letter appears in turn behind a block cursor. */
.stage-command .typed span { opacity: 0; animation: caption-letter 130ms linear forwards; }
@keyframes caption-letter {
  from { opacity: 1; background: var(--tone); color: transparent; }
  to { opacity: 1; background: transparent; }
}
.stage-command p {
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
  color: var(--green);
  font: 14px/1.5 var(--mono);
  overflow-wrap: anywhere;
}
.stage-command p:empty { display: none; }
.stage-command p.in { animation: stage-in .35s ease-out both; }
.stage-command[data-state="paused"] p { color: var(--body); font-family: var(--sans); }
.stage-command[data-state="warning"] p { color: var(--gold); }
.stage-hint {
  position: absolute;
  left: 50%;
  bottom: 4px;
  transform: translateX(-50%);
  margin: 0;
  padding: 3px 10px;
  border-radius: 99px;
  background: #0f1726c4;
  color: var(--muted);
  font: 11px var(--mono);
  width: max-content;
  max-width: calc(100% - 24px);
  text-align: center;
  pointer-events: none;
  animation: stage-in .6s 2.3s ease-out both;
  transition: opacity .5s;
}
.stage.touched .stage-hint, .stage.leaving .stage-hint,
#workspace:has(.map-feedback:not(:empty)) .stage-hint { opacity: 0 !important; animation: none; }
#scene.returning { animation: scene-return .34s ease-out both; }
@keyframes stage-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes scene-return { from { opacity: 0; transform: scale(1.05); } to { opacity: 1; transform: none; } }
/* The section in focus gets a wider panel with larger text, right beside its island. */
#workspace[data-open-panel="station"] { --drawer-width: min(450px, 44vw); }
#station-title { font-size: 20px; line-height: 1.25; }
#station-status { font-size: 12px; }
#station-info { font-size: 15.5px; line-height: 1.55; }
#station-panel .topic-points li { grid-template-columns: 46px 1fr; padding: 8px 0; font-size: 14px; }
#station-panel .topic-points strong { font-size: 11px; }
#station-panel .topic-example { font-size: 13px; }
#station-panel .topic-tip { font-size: 13.5px; }
#station-panel .topic-nav .text-button { font-size: 13px; }
.topic-points { margin: 12px 0 11px; padding: 0; list-style: none; }
.topic-points li {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 8px;
  padding: 6px 0;
  border-top: 1px solid var(--border);
  color: var(--body);
  font-size: 12px;
}
.topic-points strong { font: 10px/1.8 var(--mono); letter-spacing: .04em; text-transform: uppercase; }
.topic-points .do strong { color: var(--green); }
.topic-points .avoid strong { color: var(--gold); }
.topic-nav {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin-top: 13px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}
.topic-nav .text-button { color: var(--accent); text-align: left; }
.topic-nav .text-button:last-child { text-align: right; }
.topic-example {
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #0f1726;
  color: var(--accent);
  font-size: 12px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.topic-tip { margin-top: 9px; color: var(--body); font-size: 12px; }
.topic-live { margin-top: 12px; }
.topic-live h3 { color: var(--muted); font-size: 12px; margin-bottom: 5px; }
@media (prefers-reduced-motion: reduce) {
  .stage, .stage-hint, #scene.returning, .flow-stop.lit i, .dock-steps.playing .now::after { animation: none; }
  .stage-command .typed span { opacity: 1; animation: none; }
  .stage-command p.in { animation: none; }
}

/* Wide stage maps: the section's information on the left, the step player on the right, and the
   map between them. Narrower screens keep the player as a dock along the bottom. */
@media (min-width: 1180px) {
  #workspace#workspace[data-view="stage"] { --player-width: 340px; --drawer-width: min(430px, 34vw); }
  #workspace#workspace[data-view="stage"] .scene-frame { inset: 0 calc(var(--player-width) + var(--edge)) 0 0; }
  #workspace#workspace[data-view="stage"][data-open-panel]:not([data-open-panel=""]) .scene-frame {
    left: calc(var(--drawer-width) + var(--edge));
  }
  #workspace#workspace[data-view="stage"] .drawer { left: var(--edge); right: auto; bottom: 16px; }
  #workspace#workspace[data-view="stage"] .drawer:not(.terminal-panel) { max-height: calc(100% - 30px); }
  #workspace#workspace[data-view="stage"][data-open-panel]:not([data-open-panel=""]) .map-breadcrumb {
    left: calc(var(--drawer-width) + var(--edge) + 12px);
  }
  #workspace#workspace[data-view="stage"][data-open-panel]:not([data-open-panel=""]) #map-station-name { display: none; }
  #workspace#workspace[data-view="stage"] .map-breadcrumb:not([hidden]) ~ .view-tools {
    left: auto;
    right: calc(var(--player-width) + var(--edge) + 12px);
    transform: none;
  }

  [data-view="stage"] .step-dock {
    top: 14px;
    bottom: 16px;
    left: auto;
    right: var(--edge);
    transform: none;
    width: var(--player-width);
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 10px;
    border: 1px solid #48577a;
    border-radius: 12px;
    background: #182338f5;
    box-shadow: 0 12px 34px #05091194;
  }
  [data-view="stage"] .dock-controls { display: contents; }
  [data-view="stage"] .dock-flow { order: 1; flex: none; gap: 1px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
  [data-view="stage"] .flow-stop { flex: 0 1 auto; min-width: 0; padding: 3px 6px 3px 5px; gap: 5px; font-size: 11px; }
  [data-view="stage"] .flow-stop .long { display: none; }
  [data-view="stage"] .flow-stop .short { display: inline; overflow: hidden; text-overflow: ellipsis; }
  [data-view="stage"] .flow-link { flex-basis: 3px; min-width: 3px; }

  /* The scrubber becomes a list of the lesson's steps. */
  [data-view="stage"] .dock-steps {
    order: 2;
    position: relative;
    flex: 1 1 auto;
    flex-direction: column;
    gap: 2px;
    min-height: 0;
    padding: 0;
    overflow: auto;
  }
  [data-view="stage"] .dock-steps button {
    flex: none;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0 9px;
    height: auto;
    min-height: 34px;
    padding: 4px 9px 4px 5px;
    border: 1px solid transparent;
    border-radius: 7px;
    color: var(--body);
    text-align: left;
  }
  [data-view="stage"] .dock-steps button::before { display: none; }
  [data-view="stage"] .dock-steps button:hover { background: #202b43; color: var(--text); }
  [data-view="stage"] .dock-steps b {
    flex: none;
    display: grid;
    place-items: center;
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: #222e44;
    color: var(--body);
    font: 10px var(--mono);
  }
  [data-view="stage"] .dock-steps span {
    display: block;
    flex: 1 1 0;
    min-width: 0;
    overflow: hidden;
    font: 11.5px var(--mono);
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  [data-view="stage"] .dock-steps .done b { background: #214036; color: var(--green); }
  [data-view="stage"] .dock-steps .target { border-color: #655d8e; border-style: dashed; }
  [data-view="stage"] .dock-steps .now { background: #2b2b49; border-color: #655d8e; border-style: solid; color: var(--text); }
  [data-view="stage"] .dock-steps .now b { background: var(--accent); color: #211935; font-weight: 750; }
  [data-view="stage"] .dock-steps.playing .now::after { top: auto; bottom: 0; height: 2px; border-radius: 0 0 6px 6px; }
  /* The step on show opens up: its whole command, what it does, and a tip. */
  [data-view="stage"] .dock-steps .now > span:first-of-type { white-space: normal; overflow-wrap: anywhere; }
  [data-view="stage"] .dock-steps span.about {
    flex: 0 0 100%;
    padding: 3px 2px 7px 33px;
    color: var(--body);
    font: 12.5px/1.5 var(--sans);
    white-space: normal;
  }
  [data-view="stage"] .dock-steps .about strong { display: block; margin-bottom: 2px; color: var(--text); font-size: 13px; }
  [data-view="stage"] .dock-steps .about em { display: block; margin-top: 5px; color: var(--muted); font-style: normal; }

  [data-view="stage"] .step-toggle { order: 3; flex: none; border-color: var(--border); background: #0f1827; }
  [data-view="stage"] .map-feedback {
    order: 4;
    flex: none;
    width: auto;
    min-height: 58px;
    max-height: 58px;
    margin: 0;
    padding: 5px 9px;
    border-radius: 7px;
    background: #0f1827;
    text-align: left;
    white-space: normal;
    overflow-wrap: anywhere;
  }
  [data-view="stage"] .map-feedback:empty { display: block; }
  [data-view="stage"] .map-feedback:empty::before { content: "Each step's result shows here."; color: var(--muted); }
  [data-view="stage"] .dock-actions { order: 5; }
  [data-view="stage"] .dock-actions .run-button { flex: 1; justify-content: center; }
}