/* cc-anatomy — single global stylesheet.
   Mood: dark blueprint / circuit board. Deep navy ground with grid paper,
   one signal-blue accent, edges drawn as traces that pulse when live.
   Semantic state colours (blocked / allowed / warn) are the only other hues.
   No component-scoped sheets, no inline styles. */

:root {
  /* blueprint ground, darkest first */
  --bp-950: #050a14;
  --bp-900: #081221;
  --bp-850: #0b182b;
  --bp-800: #0f2038;
  --bp-700: #152c4a;
  --rule: #1d3556;
  --rule-soft: #122540;

  --text: #dce8f7;
  --text-dim: #93a8c6;
  --text-mute: #64809f;

  /* the one accent — signal blue */
  --sig: #35b6ff;
  --sig-bright: #8ad6ff;
  --sig-deep: #14618f;
  --sig-ink: #03151f;
  --sig-soft: rgba(53, 182, 255, 0.12);
  --sig-line: rgba(53, 182, 255, 0.42);
  --sig-glow: rgba(53, 182, 255, 0.3);
  --trace: rgba(53, 182, 255, 0.34);

  /* state only */
  --stop: #ff6a7a;
  --go: #56d69a;
  --warn: #f0bf5c;

  --grid-major: rgba(53, 182, 255, 0.07);
  --grid-minor: rgba(53, 182, 255, 0.03);

  --font-ui: ui-sans-serif, system-ui, -apple-system, "Apple SD Gothic Neo", "Segoe UI", "Noto Sans KR", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, "Roboto Mono", monospace;

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 16px;
  --gap: 20px;
  --shell: 1260px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

/* author display rules must not resurrect [hidden] elements */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 1.62;
  color: var(--text);
  background-color: var(--bp-950);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid-minor) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-minor) 1px, transparent 1px);
  background-size: 128px 128px, 128px 128px, 32px 32px, 32px 32px;
  background-position: -1px -1px;
}

h1,
h2,
p,
ul,
figure {
  margin: 0;
}

ul {
  padding: 0;
  list-style: none;
}

a {
  color: var(--sig);
  text-decoration: none;
}

a:hover {
  color: var(--sig-bright);
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

/* `code spans` inside lesson prose, built by engine/richtext.js */
code {
  padding: 0 3px;
  border-radius: 3px;
  background: var(--sig-soft);
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--sig-bright);
}

:focus-visible {
  outline: 2px solid var(--sig);
  outline-offset: 2px;
}

/* ---------- shell ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 12px 26px;
  border-bottom: 1px solid var(--rule);
  background: rgba(5, 10, 20, 0.88);
  backdrop-filter: blur(8px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.02em;
}

.brand-mark {
  width: 15px;
  height: 15px;
  border: 2px solid var(--sig);
  border-radius: 4px;
  box-shadow: 0 0 0 3px var(--sig-soft), inset 0 0 0 2px var(--bp-950);
}

.brand-note {
  flex: 1;
  min-width: 0;
  font-size: 12px;
  color: var(--text-mute);
}

.locale {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bp-900);
}

.loc-btn {
  padding: 3px 13px;
  border: 0;
  border-radius: 999px;
  background: none;
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.loc-btn.is-on {
  background: var(--sig-soft);
  color: var(--sig-bright);
  box-shadow: inset 0 0 0 1px var(--sig-line);
}

.view {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 34px 26px 60px;
}

.footer {
  padding: 22px 26px 34px;
  border-top: 1px solid var(--rule-soft);
  color: var(--text-mute);
  font-size: 12px;
  text-align: center;
}

.back {
  display: inline-block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-mute);
}

.back:hover {
  color: var(--sig);
}

/* ---------- home ---------- */

.hero {
  max-width: 700px;
  margin-bottom: 38px;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sig);
}

.hero-title {
  margin: 8px 0 12px;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.hero-lead {
  color: var(--text-dim);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: var(--gap);
}

.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 20px;
  border: 1px solid var(--rule);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--bp-850), var(--bp-900));
  color: var(--text);
  transition: border-color 140ms ease, transform 140ms ease;
}

.card:hover {
  border-color: var(--sig-line);
  transform: translateY(-2px);
  color: var(--text);
}

.card-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--sig);
}

.card-title {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card-intro {
  flex: 1;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-dim);
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--rule-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-mute);
}

.card-progress {
  color: var(--sig);
}

.card-progress[data-state="none"] {
  color: var(--text-mute);
}

.card-progress[data-state="completed"] {
  color: var(--go);
}

/* ---------- lesson ---------- */

.lesson-head {
  margin-bottom: 22px;
}

.lesson-title {
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -0.02em;
}

.lesson-intro {
  max-width: 76ch;
  margin-top: 8px;
  color: var(--text-dim);
}

.widget-zone {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 26px;
  padding: 16px 18px;
  margin-bottom: 18px;
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  background: var(--bp-900);
}

.widget {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.widget-legend {
  padding: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.widget-values {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.chip {
  padding: 5px 13px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bp-800);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 12px;
  transition: border-color 120ms ease, color 120ms ease;
}

.chip:hover {
  border-color: var(--sig-line);
  color: var(--text);
}

.chip.is-on {
  border-color: var(--sig);
  background: var(--sig-soft);
  color: var(--sig-bright);
}

.widget--toggle .widget-values {
  gap: 0;
  padding: 3px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bp-800);
}

.seg {
  padding: 4px 14px;
  border: 0;
  border-radius: 999px;
  background: none;
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 12px;
}

.seg.is-on {
  background: var(--sig-soft);
  color: var(--sig-bright);
  box-shadow: inset 0 0 0 1px var(--sig-line);
}

.stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: var(--gap);
  align-items: stretch;
}

.canvas {
  overflow-x: auto;
  padding: 14px;
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  background:
    radial-gradient(circle at 50% 0%, rgba(53, 182, 255, 0.06), transparent 62%),
    var(--bp-900);
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  border: 1px solid var(--rule);
  border-left: 2px solid var(--sig-line);
  border-radius: var(--r-md);
  background: var(--bp-900);
}

.panel-step {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.panel-badge {
  min-height: 0;
}

.panel-text {
  font-size: 14.5px;
  color: var(--text);
}

.badge {
  display: inline-block;
  padding: 2px 10px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bp-800);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.badge[data-tone="blocked"] {
  border-color: rgba(255, 106, 122, 0.55);
  background: rgba(255, 106, 122, 0.12);
  color: var(--stop);
}

.badge[data-tone="allowed"] {
  border-color: rgba(86, 214, 154, 0.55);
  background: rgba(86, 214, 154, 0.12);
  color: var(--go);
}

.badge[data-tone="warn"] {
  border-color: rgba(240, 191, 92, 0.55);
  background: rgba(240, 191, 92, 0.12);
  color: var(--warn);
}

/* ---------- control bar ---------- */

.controlbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 16px;
  padding: 12px 16px;
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  background: var(--bp-900);
}

.ctrl-group {
  display: flex;
  gap: 7px;
}

.ctrl {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-width: 40px;
  height: 36px;
  padding: 0 12px;
  border: 1px solid var(--rule);
  border-radius: var(--r-sm);
  background: var(--bp-800);
  color: var(--text-dim);
  font-size: 13px;
  justify-content: center;
  transition: border-color 120ms ease, color 120ms ease;
}

.ctrl:hover:not(:disabled) {
  border-color: var(--sig-line);
  color: var(--text);
}

.ctrl:disabled {
  opacity: 0.35;
  cursor: default;
}

.ctrl.is-on {
  border-color: var(--sig);
  background: var(--sig-soft);
  color: var(--sig-bright);
}

.ctrl-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.dots {
  display: flex;
  flex: 1;
  flex-wrap: wrap;
  gap: 7px;
}

.dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 50%;
  background: var(--bp-800);
  transition: background-color 120ms ease, border-color 120ms ease;
}

.dot.is-past {
  border-color: var(--sig-deep);
  background: var(--sig-deep);
}

.dot.is-on {
  border-color: var(--sig);
  background: var(--sig);
  box-shadow: 0 0 0 3px var(--sig-soft);
}

.stepind {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}

.hint {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-mute);
}

/* ---------- diagram ---------- */

.diagram {
  display: block;
  width: 100%;
  min-width: 620px;
  height: auto;
}

.node-box {
  fill: var(--bp-800);
  stroke: var(--rule);
  stroke-width: 1.4;
  transition: fill 160ms ease, stroke 160ms ease;
}

.node-label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  fill: var(--text-dim);
  transition: fill 160ms ease;
}

.node--artifact .node-box {
  stroke-dasharray: 5 4;
}

.node--decision .node-box {
  stroke: var(--sig-line);
}

.node--terminal .node-box {
  fill: var(--bp-700);
  stroke-width: 2;
}

.node {
  transition: opacity 160ms ease;
}

.node.is-idle,
.cluster.is-idle {
  opacity: 0.42;
}

.node.is-active .node-box {
  fill: var(--sig-soft);
  stroke: var(--sig);
  stroke-width: 2;
  filter: drop-shadow(0 0 7px var(--sig-glow));
}

.node.is-active .node-label {
  fill: var(--sig-bright);
}

.cluster-box {
  fill: rgba(53, 182, 255, 0.035);
  stroke: rgba(53, 182, 255, 0.24);
  stroke-width: 1.2;
  stroke-dasharray: 3 5;
  transition: fill 160ms ease, stroke 160ms ease;
}

.cluster.is-active .cluster-box {
  fill: var(--sig-soft);
  stroke: var(--sig-line);
}

.cluster-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: var(--text-mute);
}

.cluster.is-active .cluster-label {
  fill: var(--sig);
}

.edge-line {
  fill: none;
  stroke: var(--trace);
  stroke-width: 1.5;
  stroke-linecap: round;
  transition: stroke 160ms ease, stroke-width 160ms ease;
}

.edge-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  fill: var(--text-mute);
  stroke: var(--bp-900);
  stroke-width: 4px;
  stroke-linejoin: round;
  paint-order: stroke fill;
}

.arrowhead path {
  fill: var(--trace);
}

.arrowhead--hot path {
  fill: var(--sig-bright);
}

.edge.is-pulse .edge-line {
  stroke: var(--sig-bright);
  stroke-width: 2.1;
  stroke-dasharray: 8 10;
  filter: drop-shadow(0 0 5px var(--sig-glow));
  animation: trace 780ms linear infinite;
}

.edge.is-pulse .edge-label {
  fill: var(--sig-bright);
}

@keyframes trace {
  from { stroke-dashoffset: 18; }
  to { stroke-dashoffset: 0; }
}

/* ---------- quiz ---------- */

.lesson-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--rule-soft);
}

.quiz-lead {
  flex: 1;
  min-width: 220px;
  font-size: 13px;
  color: var(--text-mute);
}

.quiz {
  margin-top: 18px;
}

.quiz-head {
  font-size: 17px;
  letter-spacing: -0.01em;
}

.quiz-list {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.quiz-card {
  padding: 16px 18px;
  border: 1px solid var(--rule);
  border-radius: var(--r-md);
  background: var(--bp-900);
}

.quiz-num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--text-mute);
}

.quiz-q {
  margin-top: 4px;
  font-size: 15px;
}

.quiz-choices {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.quiz-choice {
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  border-radius: var(--r-sm);
  background: var(--bp-800);
  color: var(--text-dim);
  font-size: 13.5px;
  text-align: left;
  transition: border-color 120ms ease, color 120ms ease;
}

.quiz-choice:hover:not(:disabled) {
  border-color: var(--sig-line);
  color: var(--text);
}

.quiz-choice:disabled {
  cursor: default;
}

.quiz-choice.is-answer {
  border-color: rgba(86, 214, 154, 0.55);
  background: rgba(86, 214, 154, 0.12);
  color: var(--go);
}

.quiz-choice.is-wrong {
  border-color: rgba(255, 106, 122, 0.55);
  background: rgba(255, 106, 122, 0.1);
  color: var(--stop);
}

.quiz-verdict {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.quiz-verdict[data-tone="allowed"] {
  color: var(--go);
}

.quiz-verdict[data-tone="blocked"] {
  color: var(--stop);
}

.quiz-score {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--sig);
}

/* ---------- sources ---------- */

.sources {
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--rule-soft);
}

.sources-head {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.sources-list {
  display: grid;
  gap: 4px;
  margin-top: 8px;
  font-size: 13px;
  word-break: break-all;
}

.sources-note {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-mute);
}

/* ---------- fallback ---------- */

.notice {
  margin-top: 22px;
  padding: 16px 18px;
  border: 1px solid rgba(255, 106, 122, 0.4);
  border-left: 3px solid var(--stop);
  border-radius: var(--r-md);
  background: rgba(255, 106, 122, 0.07);
}

.notice-head {
  font-weight: 600;
  color: var(--stop);
}

.notice-body {
  margin-top: 4px;
  font-size: 13.5px;
  color: var(--text-dim);
}

.notice-list {
  margin-top: 10px;
  display: grid;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-mute);
}

/* ---------- responsive ---------- */

/* Below this width the stage stacks: diagram on top, explanation under it.
   The contract is "stacked at 860 and narrower"; starting at 980 covers it. */
@media (max-width: 980px) {
  .stage {
    grid-template-columns: minmax(0, 1fr);
  }

  .panel {
    border-left: 1px solid var(--rule);
    border-top: 2px solid var(--sig-line);
  }
}

/* Touch sizing: at tablet width and below every control is at least 40px on
   its short side, including the step dots (padding gives the hit area, the
   painted dot stays small through background-clip). */
@media (max-width: 860px) {
  .ctrl {
    min-height: 44px;
  }

  .chip,
  .seg,
  .loc-btn {
    min-height: 40px;
  }

  .widget-values {
    gap: 8px;
  }

  .dot {
    width: 40px;
    height: 40px;
    padding: 15px;
    border: 0;
    background-clip: content-box;
  }

  .dot.is-on {
    box-shadow: none;
  }

  .dots {
    gap: 0;
  }
}

@media (max-width: 720px) {
  .topbar {
    flex-wrap: wrap;
    padding: 10px 16px;
  }

  .brand-note {
    order: 3;
    flex-basis: 100%;
    font-size: 11px;
  }

  .view {
    padding: 24px 16px 48px;
  }

  .controlbar {
    flex-wrap: wrap;
  }

  .dots {
    order: 3;
    flex-basis: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .edge.is-pulse .edge-line {
    animation: none;
    stroke-dasharray: none;
  }

  .card:hover {
    transform: none;
  }
}