:root {
  --bg: #0b1120;
  --panel: #111a2e;
  --panel-2: #16213a;
  --border: #24314d;
  --text: #e6edf7;
  --muted: #94a3b8;
  --accent: #4ade80;
  --accent-strong: #22c55e;
  --amber: #fbbf24;
  --red: #f87171;
  --blue: #60a5fa;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --radius: 10px;
  --sidebar-bg: #0d1527;
  --panel-inset: #0d1626;
  --code-bg: #0a1220;
  --code-bg-2: #17233a;
  --terminal-bg: #050a12;
  --text-soft: #cbd6e6;
  --border-strong: #3b4c6e;
  --focus-border: #2f5d45;
  --accent-border: #1d4a33;
  --ok-bg: #0f2418;
  --bad-bg: #2a1216;
  --amber-border: #4a3a16;
  --dim: #5b6b88;
  --dot: #33415c;
  --track: #1a2438;
  --blue-border: #27406b;
  --brand-bg: #0f2a1d;
  --on-accent: #04150b;
  --display: var(--sans);
  --shadow: none;

}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

#app { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
  position: sticky;
  top: 0;
  align-self: flex-start;
  width: 320px;
  height: 100vh;
  flex: 0 0 320px;
  display: flex;
  flex-direction: column;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 20px 12px;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.4px;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  font-family: var(--mono);
  color: var(--accent);
  background: var(--brand-bg);
  border: 1px solid var(--accent-border);
  border-radius: 8px;
  padding: 1px 7px;
}
.brand-text { font-size: 1.05rem; }
.brand-sub { color: var(--muted); font-weight: 500; font-size: 0.8rem; margin-left: 4px; }

.course-meta {
  padding: 4px 20px 14px;
  border-bottom: 1px solid var(--border);
}
.course-meta .code { color: var(--accent); font-family: var(--mono); font-size: 0.78rem; }
.course-meta .title { color: var(--muted); font-size: 0.82rem; line-height: 1.35; }

.outline { flex: 1; overflow-y: auto; padding: 12px 10px 24px; }
.outline h3 {
  margin: 16px 10px 4px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--muted);
}
.outline-module { margin-bottom: 6px; }
.outline-module summary {
  cursor: pointer;
  list-style: none;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--text-soft);
  font-size: 0.85rem;
  display: flex;
  gap: 8px;
  align-items: baseline;
}
.outline-module summary::-webkit-details-marker { display: none; }
.outline-module summary:hover { background: var(--panel); }
.outline-module .num {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  min-width: 18px;
}
.outline-module[open] summary { color: var(--text); }

.lesson-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 10px 6px 12px;
  margin: 1px 0 1px 8px;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  color: var(--muted);
  font-size: 0.83rem;
  cursor: pointer;
}
.lesson-link:hover { background: var(--panel); color: var(--text); text-decoration: none; }
.lesson-link .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--dot);
  flex: 0 0 7px;
  transform: translateY(-1px);
}
.lesson-link.current { color: var(--text); background: var(--panel); border-left-color: var(--accent); }
.lesson-link.done .dot { background: var(--accent); }
.lesson-link .kind { margin-left: auto; color: var(--dim); font-size: 0.68rem; font-family: var(--mono); }

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 14px 20px 16px;
}
.xp-row { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.82rem; margin-bottom: 6px; }
.xp-row strong { color: var(--accent); font-family: var(--mono); }
.progress { height: 6px; background: var(--track); border-radius: 999px; overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: linear-gradient(90deg, var(--accent-strong), var(--accent)); transition: width 0.25s ease; }
button.ghost.small {
  margin-top: 12px;
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 4px 9px;
  border-radius: 7px;
  font-size: 0.74rem;
  cursor: pointer;
}
button.ghost.small:hover { color: var(--text); border-color: var(--muted); }

/* Main */
.main { flex: 1; min-width: 0; }
.content { max-width: 840px; margin: 0 auto; padding: 40px 40px 96px; }
.content.wide { max-width: 1180px; }

.crumbs { display: flex; gap: 10px; align-items: center; color: var(--muted); font-size: 0.78rem; margin-bottom: 8px; }
.crumbs .sep { opacity: 0.45; }
.crumbs .pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 9px;
  font-family: var(--mono);
  font-size: 0.68rem;
  text-transform: uppercase;
}
.crumbs .pill.reading { color: var(--blue); border-color: var(--blue-border); }
.crumbs .pill.checkpoint { color: var(--amber); border-color: var(--amber-border); }
.crumbs .pill.exercise { color: var(--accent); border-color: var(--accent-border); }

h1.lesson-title { font-family: var(--display); font-size: 2rem; line-height: 1.2; margin: 0 0 20px; letter-spacing: -0.02em; }

.lesson-prose h2 { font-family: var(--display); font-size: 1.35rem; margin: 32px 0 10px; }
.lesson-prose h3 { font-family: var(--display); font-size: 1.08rem; margin: 24px 0 8px; color: var(--text); }
.lesson-prose p { margin: 0 0 14px; color: var(--text-soft); }
.lesson-prose ul, .lesson-prose ol { margin: 0 0 16px; padding-left: 22px; color: var(--text-soft); }
.lesson-prose li { margin-bottom: 5px; }
.lesson-prose blockquote {
  margin: 18px 0;
  padding: 12px 18px;
  border-left: 3px solid var(--accent-strong);
  background: var(--panel-inset);
  border-radius: 0 8px 8px 0;
  color: var(--text-soft);
}
.lesson-prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
}
.lesson-prose pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  overflow-x: auto;
}
.lesson-prose pre code { background: none; border: 0; padding: 0; }
.lesson-prose table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 0.9rem; }
.lesson-prose th, .lesson-prose td { border: 1px solid var(--border); padding: 8px 11px; text-align: left; }
.lesson-prose th { background: var(--panel); color: var(--text); }

/* Checkpoint */
.checkpoint { border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel); padding: 20px; margin: 20px 0; }
.question + .question { border-top: 1px solid var(--border); margin-top: 20px; padding-top: 20px; }
.question h3 { margin: 0 0 12px; font-size: 1rem; }
.options { display: grid; gap: 8px; }
.option {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-inset);
  cursor: pointer;
  color: var(--text-soft);
  font-size: 0.92rem;
}
.option:hover { border-color: var(--border-strong); }
.option input { margin-top: 3px; accent-color: var(--accent-strong); }
.option.correct { border-color: var(--accent-strong); background: var(--ok-bg); }
.option.wrong { border-color: var(--red); background: var(--bad-bg); }
.option input:disabled { cursor: default; }
.feedback { margin-top: 8px; font-size: 0.86rem; color: var(--muted); }
.feedback.ok { color: var(--accent); }
.feedback.bad { color: var(--red); }

/* Exercise */
.exercise { margin: 20px 0; }
.exercise-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.exercise-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
.exercise-grid.text-only { grid-template-columns: minmax(0, 1fr); }
.exercise-grid.text-only textarea.code { min-height: 260px; }
@media (max-width: 1080px) { .exercise-grid { grid-template-columns: 1fr; } }

.editor-pane, .preview-pane { display: flex; flex-direction: column; min-width: 0; }
.pane-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 6px; }
textarea.code {
  width: 100%;
  min-height: 300px;
  resize: vertical;
  background: var(--code-bg);
  color: var(--text-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.55;
  tab-size: 2;
}
textarea.code:focus { outline: 1px solid var(--focus-border); border-color: var(--focus-border); }
iframe.preview {
  width: 100%;
  min-height: 300px;
  flex: 1;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.preview-empty {
  min-height: 300px;
  display: grid;
  place-items: center;
  color: var(--muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  font-size: 0.84rem;
}

.toolbar { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
button.btn {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
}
button.btn:hover { border-color: var(--border-strong); }
button.btn.primary { background: var(--accent-strong); border-color: var(--accent-strong); color: var(--on-accent); }
button.btn.primary:hover { background: var(--accent); }
button.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.test-list { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 6px; }
.test-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  font-size: 0.87rem;
}
.test-item .icon { font-family: var(--mono); font-weight: 700; }
.test-item.pass .icon { color: var(--accent); }
.test-item.fail .icon { color: var(--red); }
.test-item.pending .icon { color: var(--muted); }
.test-item .msg { color: var(--red); font-size: 0.8rem; margin-top: 3px; }
.test-summary { margin-top: 12px; font-size: 0.9rem; font-weight: 600; }
.test-summary.pass { color: var(--accent); }
.test-summary.fail { color: var(--red); }

details.hints { margin: 14px 0; border: 1px solid var(--border); border-radius: 8px; padding: 8px 14px; background: var(--panel-inset); }
details.hints summary { cursor: pointer; color: var(--amber); font-size: 0.86rem; }
details.hints li { color: var(--muted); font-size: 0.86rem; margin: 6px 0; }

/* Footer nav */
.lesson-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.lesson-footer .spacer { flex: 1; }

/* Course picker / error */
.placeholder { padding: 8vh 0; max-width: 640px; }
.placeholder h1 { font-family: var(--display); font-size: 2.4rem; margin: 0 0 8px; }
.placeholder p { color: var(--muted); }
.course-list { display: grid; gap: 12px; margin-top: 24px; }
.course-card {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--text);
}
.course-card:hover { border-color: var(--border-strong); text-decoration: none; }
.course-card .code { color: var(--accent); font-family: var(--mono); font-size: 0.78rem; }
.course-card .title { font-size: 1.05rem; margin: 2px 0 4px; }
.course-card .meta { color: var(--muted); font-size: 0.8rem; }
code.cmd { font-family: var(--mono); background: var(--code-bg-2); border: 1px solid var(--border); border-radius: 5px; padding: 2px 6px; }

.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  padding: 10px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.84rem;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 860px) {
  #app { flex-direction: column; }
  .sidebar { position: static; width: 100%; flex: none; height: auto; border-right: 0; border-bottom: 1px solid var(--border); }
  .outline { max-height: 34vh; }
  .content { padding: 24px 20px 72px; }
  h1.lesson-title { font-size: 1.55rem; }
}

/* Widgets ----------------------------------------------------------- */

.widget {
  margin: 22px 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 20px;
}
.widget .lesson-prose:first-child { margin-top: 0; }
.widget-note {
  margin-top: 12px;
  font-size: 0.88rem;
  color: var(--muted);
}
.widget-note.ok { color: var(--accent); }
.widget-note.bad { color: var(--red); }
.widget-explanation { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.ghost-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 0.8rem;
  cursor: pointer;
}
.ghost-btn:hover:not(:disabled) { color: var(--text); border-color: var(--muted); }
.ghost-btn:disabled { opacity: 0.3; cursor: not-allowed; }
textarea.code.short { min-height: 110px; }
.field-label { display: block; margin: 16px 0 6px; color: var(--muted); font-size: 0.8rem; }

.order-list { list-style: none; margin: 16px 0 0; padding: 0; display: grid; gap: 8px; counter-reset: order; }
.order-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-inset);
}
.order-item::before {
  counter-increment: order;
  content: counter(order);
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.78rem;
  min-width: 16px;
}
.order-label { flex: 1; font-size: 0.9rem; }
.order-controls { display: flex; gap: 4px; }

.fill-passage {
  font-family: var(--mono);
  font-size: 0.88rem;
  line-height: 2.3;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  white-space: pre-wrap;
}
.fill-input {
  font-family: var(--mono);
  font-size: 0.86rem;
  background: var(--code-bg-2);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 5px;
  padding: 2px 6px;
}
.fill-input.ok { border-color: var(--accent-strong); background: var(--ok-bg); }
.fill-input.bad { border-color: var(--red); background: var(--bad-bg); }

.hotspot-board {
  display: grid;
  gap: 10px;
  margin-top: 16px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.hotspot-board button {
  text-align: left;
  background: var(--panel-inset);
  border: 1px solid var(--border);
  color: var(--text-soft);
  border-radius: 8px;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 0.84rem;
  cursor: pointer;
}
.hotspot-board button:hover { border-color: var(--border-strong); }
.hotspot-board button.found { border-color: var(--accent-strong); background: var(--ok-bg); color: var(--accent); }
.hotspot-feedback { margin-top: 8px; font-size: 0.86rem; }
.hotspot-feedback.ok strong { color: var(--accent); }
.hotspot-feedback.bad strong { color: var(--red); }
.hotspot-feedback .lesson-prose { margin: 2px 0 0; }

.review-lines { display: grid; gap: 2px; margin-top: 16px; background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px; }
.review-line {
  display: flex;
  gap: 12px;
  text-align: left;
  background: none;
  border: 1px solid transparent;
  border-radius: 5px;
  padding: 6px 8px;
  color: var(--text-soft);
  font-family: var(--mono);
  font-size: 0.82rem;
  cursor: pointer;
  white-space: pre-wrap;
}
.review-line:hover { border-color: var(--border); }
.review-line.del { background: var(--bad-bg); }
.review-line.add { background: var(--ok-bg); }
.review-line.selected { border-color: var(--amber); box-shadow: inset 3px 0 0 var(--amber); }
.review-line.bad-line { border-color: var(--red); }
.review-line .ln { color: var(--dim); min-width: 18px; }
.review-why { color: var(--muted); font-size: 0.82rem; padding: 2px 0 8px 36px; }
.review-why .lesson-prose { margin: 0; }

.scenario-grid { display: grid; gap: 10px; margin-top: 16px; }
.scenario-option {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-align: left;
  background: var(--panel-inset);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 14px 16px;
  cursor: pointer;
}
.scenario-option:hover:not(:disabled) { border-color: var(--border-strong); }
.scenario-option:disabled { cursor: default; opacity: 0.75; }
.scenario-option.chosen, .scenario-option.recommended { border-color: var(--accent-strong); opacity: 1; }
.scenario-option.recommended::after { content: "Recommended"; color: var(--accent); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.07em; }
.scenario-label { font-weight: 600; }
.scenario-hint { color: var(--muted); font-size: 0.78rem; }
.scenario-result { margin-top: 16px; }
.effects-table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 0.85rem; }
.effects-table th, .effects-table td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.effects-table th { color: var(--muted); font-weight: 500; width: 40%; }

.calibration-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 16px; }
@media (max-width: 900px) { .calibration-grid { grid-template-columns: 1fr; } }
.calibration-option {
  display: block;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-inset);
  padding: 14px;
  cursor: pointer;
}
.calibration-option:has(input:checked) { border-color: var(--accent-strong); }
.calibration-option input { accent-color: var(--accent-strong); }
.calibration-title { display: block; font-weight: 600; margin: 4px 0 8px; }
.calibration-result { margin-top: 16px; }

.viva-stage { margin-top: 16px; }
.viva-question { font-weight: 600; margin: 6px 0 10px; }
.viva-result { margin-top: 16px; }
.viva-strong, .viva-follow { background: var(--panel-inset); border: 1px solid var(--border); border-radius: 8px; padding: 12px 16px; margin-top: 12px; }
.viva-strong h4, .viva-follow h4 { margin: 0 0 8px; color: var(--accent); font-size: 0.9rem; }
.signal-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.signal-list span { font-size: 0.78rem; border: 1px solid var(--border); border-radius: 999px; padding: 2px 9px; }
.signal-list.ok span { color: var(--accent); border-color: var(--accent-border); }
.signal-list.bad span { color: var(--amber); border-color: var(--amber-border); }
.viva-rubric { display: grid; gap: 8px; margin: 16px 0; }
.viva-rubric-item { display: flex; gap: 10px; align-items: flex-start; font-size: 0.9rem; color: var(--text-soft); }
.viva-rubric-item input { margin-top: 3px; accent-color: var(--accent-strong); }

.api-controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 16px; }
.api-controls select {
  flex: 1;
  min-width: 220px;
  background: var(--code-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-family: var(--mono);
  font-size: 0.82rem;
}
.api-response { margin-top: 16px; }
.api-status { display: flex; gap: 10px; align-items: center; font-family: var(--mono); font-size: 0.82rem; }
.api-status .method { color: var(--accent); }
.api-status .ok { color: var(--accent); }
.api-status .bad { color: var(--red); }
.api-json {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  overflow-x: auto;
  font-size: 0.82rem;
  max-height: 320px;
}
.api-questions { margin-top: 8px; }

.sql-editor { width: 100%; }
.sql-output { margin-top: 14px; overflow-x: auto; }
.result-table { width: 100%; border-collapse: collapse; font-size: 0.84rem; }
.result-table th, .result-table td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.result-table th { background: var(--panel-2); color: var(--muted); }

.terminal-goals { display: flex; flex-wrap: wrap; gap: 8px 16px; margin: 16px 0; font-size: 0.84rem; }
.terminal-goal { color: var(--muted); }
.terminal-goal.done { color: var(--accent); }
.terminal-output {
  background: var(--terminal-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  min-height: 180px;
  max-height: 360px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-soft);
}
.terminal-output .lesson-prose { margin: 0; }
.terminal-output .lesson-prose p { margin: 0; color: inherit; }
.terminal-echo { color: var(--accent); }
.terminal-bad { color: var(--red); }
.terminal-ok { color: var(--accent); }
.terminal-help { color: var(--amber); }
.terminal-form { display: flex; gap: 8px; align-items: center; margin-top: 10px; }
.terminal-prompt { color: var(--accent); font-family: var(--mono); font-size: 0.82rem; white-space: nowrap; }
.terminal-input {
  flex: 1;
  background: var(--terminal-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 0.84rem;
}
.terminal-input:focus { outline: 1px solid var(--focus-border); border-color: var(--focus-border); }

/* Ink story ---------------------------------------------------------- */

.story-panel {
  margin-top: 16px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}
.story-text {
  max-height: 380px;
  overflow-y: auto;
  color: var(--text-soft);
  font-size: 0.98rem;
  line-height: 1.7;
}
.story-text p { margin: 0 0 14px; white-space: pre-wrap; }
.story-text p:last-child { margin-bottom: 0; }
.story-choices { display: grid; gap: 8px; margin-top: 16px; }
.story-choice {
  text-align: left;
  background: var(--panel-inset);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 11px 14px;
  font-size: 0.9rem;
  cursor: pointer;
}
.story-choice:hover { border-color: var(--border-strong); background: var(--panel-2); }
.story-toolbar { display: flex; gap: 10px; align-items: center; margin-top: 14px; }
.story-end {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Achievements ------------------------------------------------------- */

#badges-button {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
}
#badge-count {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
}
.badge-dialog {
  width: min(760px, calc(100vw - 32px));
  max-height: min(80vh, 720px);
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  color: var(--text);
  padding: 22px;
}
.badge-dialog::backdrop { background: rgba(3, 8, 18, 0.72); }
.badge-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
}
.badge-head h2 { font-family: var(--display); margin: 0 0 4px; font-size: 1.25rem; }
.badge-summary { margin: 0; color: var(--muted); font-size: 0.84rem; }
.badge-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  overflow-y: auto;
  max-height: 58vh;
  padding-right: 4px;
}
.badge-card {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-inset);
  padding: 12px;
}
.badge-card.earned { border-color: var(--accent-border); background: var(--ok-bg); }
.badge-card.locked { opacity: 0.55; }
.badge-icon {
  flex: 0 0 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  background: var(--code-bg);
}
.badge-card.earned .badge-icon { color: var(--accent); border-color: var(--accent-strong); }
.badge-body strong { display: block; font-size: 0.9rem; margin-bottom: 3px; }
.badge-body p { margin: 0 0 6px; color: var(--muted); font-size: 0.8rem; line-height: 1.4; }
.badge-progress { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); }
.badge-card.locked .badge-progress { color: var(--muted); }


/* Skins -------------------------------------------------------------- */

.theme-picker {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.78rem;
}
.theme-picker select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px 6px;
  font-family: var(--mono);
  font-size: 0.74rem;
}

html[data-theme="pixel"] {
  --bg: #070b14;
  --sidebar-bg: #0b1220;
  --panel: #101827;
  --panel-2: #16233a;
  --panel-inset: #0d1728;
  --code-bg: #05090f;
  --code-bg-2: #102033;
  --terminal-bg: #03060a;
  --border: #2a3d5c;
  --border-strong: #3f5d86;
  --text: #e8f7ee;
  --text-soft: #c5e5d2;
  --muted: #8fa99b;
  --dim: #5f7d6c;
  --dot: #2a3d5c;
  --track: #101827;
  --accent: #63f2a4;
  --accent-strong: #2bd47a;
  --accent-border: #1d6b45;
  --focus-border: #2bd47a;
  --blue: #6ec6ff;
  --blue-border: #2b5f8a;
  --amber: #ffd166;
  --amber-border: #6b5420;
  --red: #ff6b6b;
  --ok-bg: #0d2a1b;
  --bad-bg: #2a1216;
  --brand-bg: #0d2a1b;
  --on-accent: #04150b;
  --radius: 0px;
  --sans: var(--mono);
  --display: var(--mono);
  --shadow: 3px 3px 0 #000;
}
html[data-theme="pixel"] body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    0deg,
    rgba(255, 255, 255, 0.03) 0,
    rgba(255, 255, 255, 0.03) 1px,
    transparent 1px,
    transparent 3px
  );
  z-index: 9999;
}
html[data-theme="pixel"] .brand-mark {
  border-radius: 0;
  box-shadow: var(--shadow);
}
html[data-theme="pixel"] .btn,
html[data-theme="pixel"] .ghost-btn,
html[data-theme="pixel"] .scenario-option,
html[data-theme="pixel"] .story-choice,
html[data-theme="pixel"] .review-line,
html[data-theme="pixel"] .hotspot-board button,
html[data-theme="pixel"] .calibration-option,
html[data-theme="pixel"] .badge-card,
html[data-theme="pixel"] .theme-picker select {
  border-radius: 0;
}
html[data-theme="pixel"] .btn {
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-family: var(--mono);
  box-shadow: var(--shadow);
}
html[data-theme="pixel"] .btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 #000;
}
html[data-theme="pixel"] h1.lesson-title {
  text-shadow: 3px 3px 0 #000;
}
html[data-theme="pixel"] .progress {
  height: 10px;
  border-radius: 0;
  background: repeating-linear-gradient(
    90deg,
    var(--track) 0 8px,
    transparent 8px 10px
  );
}
html[data-theme="pixel"] .progress-bar {
  border-radius: 0;
  background: var(--accent);
}
html[data-theme="pixel"] .brand-sub {
  color: var(--accent);
}

html[data-theme="storybook"] {
  color-scheme: light;
  --bg: #f7efe2;
  --sidebar-bg: #f1e4d0;
  --panel: #fffaf0;
  --panel-2: #f4e8d6;
  --panel-inset: #fbf3e6;
  --code-bg: #f3e8d6;
  --code-bg-2: #eadcc6;
  --terminal-bg: #241b14;
  --border: #d9c7ab;
  --border-strong: #b9a184;
  --text: #2b2118;
  --text-soft: #4a3b2d;
  --muted: #7a6a56;
  --dim: #9b8a74;
  --dot: #cbb99f;
  --track: #e5d6c1;
  --accent: #2f6f4f;
  --accent-strong: #245a3f;
  --accent-border: #9cc3a8;
  --focus-border: #2f6f4f;
  --blue: #2b6cb0;
  --blue-border: #9db9d6;
  --amber: #b7791f;
  --amber-border: #e0c28a;
  --red: #b23a48;
  --ok-bg: #e8f4ea;
  --bad-bg: #f7e2e2;
  --brand-bg: #e8f4ea;
  --on-accent: #fffaf0;
  --radius: 14px;
  --display: Georgia, "Iowan Old Style", "Palatino Linotype", serif;
  --shadow: 0 10px 28px rgba(74, 52, 28, 0.12);
}
html[data-theme="storybook"] body {
  background:
    radial-gradient(circle at 18% 0%, #fff8eb 0, rgba(255, 248, 235, 0) 46%),
    radial-gradient(circle at 92% 12%, #f1dfc4 0, rgba(241, 223, 196, 0) 40%),
    var(--bg);
}
html[data-theme="storybook"] .sidebar {
  background: linear-gradient(180deg, #f5e9d8, #eddfc9);
}
html[data-theme="storybook"] .brand-mark {
  border-radius: 999px;
  box-shadow: 0 6px 16px rgba(74, 52, 28, 0.18);
}
html[data-theme="storybook"] .btn {
  box-shadow: 0 4px 12px rgba(74, 52, 28, 0.12);
}
html[data-theme="storybook"] .btn.primary {
  box-shadow: 0 4px 14px rgba(36, 90, 63, 0.25);
}
html[data-theme="storybook"] .lesson-prose pre,
html[data-theme="storybook"] .api-json,
html[data-theme="storybook"] .story-panel,
html[data-theme="storybook"] .fill-passage,
html[data-theme="storybook"] .review-lines {
  border-color: var(--border);
}
html[data-theme="storybook"] .terminal-output,
html[data-theme="storybook"] .terminal-input {
  color: #f6efe3;
}
html[data-theme="storybook"] .terminal-output {
  background: var(--terminal-bg);
}
html[data-theme="storybook"] .terminal-input {
  background: var(--terminal-bg);
}
html[data-theme="storybook"] .toast {
  box-shadow: 0 10px 26px rgba(74, 52, 28, 0.18);
}
html[data-theme="storybook"] .badge-dialog {
  box-shadow: 0 24px 80px rgba(74, 52, 28, 0.25);
}

/* Picker illustration ------------------------------------------------- */

.picker-hero {
  display: grid;
  grid-template-columns: minmax(220px, 320px) 1fr;
  gap: 26px;
  align-items: center;
  margin-bottom: 26px;
}
@media (max-width: 720px) {
  .picker-hero { grid-template-columns: 1fr; gap: 12px; }
  .picker-art { max-width: 300px; margin: 0 auto; }
}
.picker-art { position: relative; }
.picker-art svg { display: none; width: 100%; height: auto; }
.art-ink { display: block; opacity: 0.9; }
html[data-theme="pixel"] .art-ink,
html[data-theme="storybook"] .art-ink { display: none; }
html[data-theme="pixel"] .art-pixel { display: block; image-rendering: pixelated; filter: drop-shadow(6px 6px 0 rgba(0, 0, 0, 0.55)); }
html[data-theme="storybook"] .art-storybook { display: block; filter: drop-shadow(0 22px 34px rgba(74, 52, 28, 0.2)); }
.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.skin-tag {
  display: inline-block;
  margin-left: 4px;
  padding: 1px 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
html[data-theme="pixel"] .skin-tag { border-radius: 0; }

@keyframes art-twinkle {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 1; }
}
@keyframes art-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}
@keyframes art-steam {
  0%, 100% { opacity: 0.2; transform: translateY(2px); }
  50% { opacity: 0.7; transform: translateY(-3px); }
}
.picker-art .twinkle { animation: art-twinkle 2.6s steps(2, end) infinite; }
.picker-art .float { animation: art-float 6s ease-in-out infinite; }
.picker-art .steam { animation: art-steam 3.2s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) {
  .picker-art * { animation: none !important; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Course emblems ----------------------------------------------------- */

.course-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.course-meta-text { min-width: 0; }
.course-emblem { flex: 0 0 42px; width: 42px; height: 42px; }
.course-emblem svg,
.course-card-emblem svg { width: 100%; height: 100%; display: block; }
.course-card {
  display: flex;
  align-items: center;
  gap: 14px;
}
.course-card-emblem { flex: 0 0 46px; width: 46px; height: 46px; }
.course-card-body { min-width: 0; display: block; }
.course-card .title { display: block; }
.course-card .meta { display: block; }
html[data-theme="pixel"] .course-emblem,
html[data-theme="pixel"] .course-card-emblem { image-rendering: pixelated; }
html[data-theme="storybook"] .course-emblem,
html[data-theme="storybook"] .course-card-emblem {
  filter: drop-shadow(0 6px 10px rgba(74, 52, 28, 0.16));
}

/* Progress dialog ---------------------------------------------------- */

.progress-dialog {
  width: min(620px, calc(100vw - 32px));
  max-height: 84vh;
}
.progress-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0;
}
.progress-import-panel {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.progress-import-panel select {
  width: 100%;
  margin: 6px 0 12px;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
}
.progress-dialog .hint {
  color: var(--muted);
  font-size: 0.82rem;
  margin: 12px 0;
}
.progress-danger {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
html[data-theme="pixel"] .progress-dialog,
html[data-theme="pixel"] .progress-import-panel select {
  border-radius: 0;
}
html[data-theme="storybook"] .progress-dialog {
  box-shadow: 0 24px 80px rgba(74, 52, 28, 0.25);
}

/* Wayfinder and trail ------------------------------------------------ */

.trail-card {
  margin: 0 10px 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel-inset);
  font-size: 0.8rem;
}
.trail-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.trail-course { color: var(--text); font-size: 0.84rem; line-height: 1.3; }
.trail-next { color: var(--muted); margin-top: 4px; line-height: 1.35; }
.trail-card .btn { margin-top: 8px; }
.btn.small { padding: 5px 10px; font-size: 0.78rem; }

.wayfinder-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 16px 18px;
  margin-bottom: 18px;
}
.wayfinder-cta h2 { margin: 0 0 4px; font-family: var(--display); font-size: 1.2rem; }
.wayfinder-cta p { margin: 0; color: var(--muted); font-size: 0.86rem; }
@media (max-width: 640px) {
  .wayfinder-cta { flex-direction: column; align-items: flex-start; }
}
.wayfinder-dialog { width: min(700px, calc(100vw - 32px)); max-height: 86vh; overflow-y: auto; }
.wayfinder-question {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 0;
  padding: 14px 0 4px;
}
.wayfinder-question:first-of-type { border-top: 0; padding-top: 0; }
.wayfinder-question legend { font-weight: 600; font-size: 0.92rem; padding: 0; margin-bottom: 8px; }
.wayfinder-options { display: grid; gap: 6px; }
.wayfinder-option {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-inset);
  padding: 9px 11px;
  font-size: 0.86rem;
  color: var(--text-soft);
  cursor: pointer;
}
.wayfinder-option:has(input:checked) { border-color: var(--accent-strong); background: var(--ok-bg); color: var(--text); }
.wayfinder-option input { margin-top: 3px; accent-color: var(--accent-strong); }
.wayfinder-course { margin: 4px 0 8px; font-family: var(--display); }
.trail-steps { list-style: none; margin: 12px 0; padding: 0; display: grid; gap: 6px; }
.trail-step {
  display: flex;
  gap: 9px;
  align-items: flex-start;
  font-size: 0.84rem;
  color: var(--text-soft);
}
.trail-index {
  flex: 0 0 18px;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.72rem;
  padding-top: 1px;
}
.trail-step.next { color: var(--text); }
.trail-step.next .trail-index { color: var(--accent); }
.trail-step.done { color: var(--muted); }
.trail-step.done .trail-index { color: var(--accent); }
.trail-step small { display: block; color: var(--muted); font-size: 0.74rem; }
.trail-steps .trail-step + .trail-step { border-top: 1px solid var(--border); padding-top: 6px; }
html[data-theme="pixel"] .trail-card,
html[data-theme="pixel"] .wayfinder-option,
html[data-theme="pixel"] .wayfinder-cta { border-radius: 0; }
html[data-theme="storybook"] .trail-card,
html[data-theme="storybook"] .wayfinder-cta { box-shadow: 0 8px 20px rgba(74, 52, 28, 0.1); }

/* Local packs -------------------------------------------------------- */

.course-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}
.course-row .course-card { flex: 1; }
.pack-remove { align-self: center; white-space: nowrap; }
.picker-tools { display: flex; gap: 8px; align-items: center; margin-top: 16px; }
.local-tag { border-color: var(--accent-border); color: var(--accent); }

/* Pack store --------------------------------------------------------- */

.store-dialog { width: min(720px, calc(100vw - 32px)); max-height: 84vh; }
.store-list { display: grid; gap: 10px; }
.store-pack {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel-inset);
  padding: 14px 16px;
}
.store-pack-body { min-width: 0; }
.store-pack h3 { margin: 2px 0 6px; font-family: var(--display); font-size: 1.05rem; }
.store-pack p { margin: 0 0 6px; color: var(--muted); font-size: 0.84rem; }
.store-meta { display: flex; flex-wrap: wrap; gap: 5px; margin: 6px 0; }
.store-meta span {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 1px 7px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
}
@media (max-width: 600px) {
  .store-pack { flex-direction: column; align-items: flex-start; }
}
html[data-theme="pixel"] .store-pack,
html[data-theme="pixel"] .store-meta span { border-radius: 0; }
html[data-theme="storybook"] .store-pack { box-shadow: 0 8px 20px rgba(74, 52, 28, 0.1); }

/* Hidden exercise test sandbox -------------------------------------- */

.test-frame {
  position: fixed;
  left: -12000px;
  top: 0;
  border: 0;
  opacity: 0;
  pointer-events: none;
  z-index: -1;
}