/* Flow diagrams and light motion — reused across lessons. */

.pipeline {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: center;
  gap: 0;
  margin: 1.5rem 0 1.8rem;
  padding: 0.4rem 0;
}

.pipeline-step {
  flex: 1 1 7.2rem;
  max-width: 9.5rem;
  background: #fffdf8;
  border: 1px solid var(--rule);
  padding: 0.7rem 0.65rem 0.8rem;
  text-align: center;
  position: relative;
}

.pipeline-step strong {
  display: block;
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 0.25rem;
}

.pipeline-step span {
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.pipeline-step.is-live {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.pipeline-arrow {
  width: 1.4rem;
  align-self: center;
  height: 2px;
  background: var(--rule);
  position: relative;
  flex: 0 0 1.4rem;
}

.pipeline-arrow::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -3px;
  border: 4px solid transparent;
  border-left-color: var(--rule);
}

.token-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  top: 50%;
  left: 0;
  margin-top: -4px;
  animation: token-travel 3.6s ease-in-out infinite;
}

@keyframes token-travel {
  0% { left: 0; opacity: 0; }
  12% { opacity: 1; }
  88% { opacity: 1; }
  100% { left: calc(100% - 8px); opacity: 0; }
}

.flavour-row {
  margin: 0.85rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--rule);
}

.flavour-row:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.flavour-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.8rem;
  font-family: var(--sans);
  font-size: 0.86rem;
  margin-bottom: 0.45rem;
}

.flavour-head .tag {
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--accent);
}

.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin: 1.3rem 0 1.6rem;
}

.compare.three {
  grid-template-columns: 1fr 1fr 1fr;
}

.compare-card {
  background: #fffdf8;
  border: 1px solid var(--rule);
  padding: 0.75rem 0.8rem 0.85rem;
}

.compare-card h3 {
  margin: 0 0 0.35rem;
  font-size: 0.88rem;
}

.compare-card p {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin: 0;
}

.caption {
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: -0.6rem 0 1.4rem;
  text-align: center;
}

.meter {
  height: 1.35rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
  margin: 0.55rem 0 0.7rem;
}

.meter-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-2);
  transition: width 0.28s ease, background 0.28s ease;
}

.meter-fill.warn { background: var(--chip-3); }
.meter-fill.fail { background: var(--bad); }

.meter-label {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}

.stack {
  display: flex;
  height: 2.1rem;
  border: 1px solid var(--rule);
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent calc(100% / 20 - 1px),
    var(--rule) calc(100% / 20 - 1px),
    var(--rule) calc(100% / 20)
  );
  overflow: hidden;
  margin: 0.4rem 0 0.8rem;
}

.stack span {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-size: 0.62rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #fff;
  overflow: hidden;
  white-space: nowrap;
  transition: flex-basis 0.28s ease;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.6rem 0 0.3rem;
}

.btn-row button {
  font-family: var(--sans);
  font-size: 0.82rem;
  background: #fffdf8;
  border: 1px solid var(--rule);
  padding: 0.35rem 0.55rem;
  cursor: pointer;
  color: var(--ink);
}

.btn-row button:hover { border-color: var(--accent); }
.btn-row button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.ucurve {
  width: 100%;
  height: auto;
  margin: 0.4rem 0 0.2rem;
}

.ucurve .pin { cursor: pointer; }

.slider-row {
  font-family: var(--sans);
  font-size: 0.88rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.7rem;
  align-items: center;
}

.worked {
  background: #fffdf8;
  border: 1px solid var(--rule);
  margin: 1.25rem 0 1.55rem;
}

.worked-head {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 0.7rem 0.95rem 0.15rem;
  margin: 0;
}

.worked-body {
  padding: 0.35rem 0.95rem 0.55rem;
}

.worked-note {
  font-family: var(--sans);
  font-size: 0.84rem;
  color: var(--ink-soft);
  border-top: 1px dashed var(--rule);
  padding: 0.7rem 0.95rem;
  margin: 0;
}

.worked-note strong { color: var(--ink); }

.tok {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.12rem;
  margin: 0 0.2rem 0.45rem 0;
}

.chip-id {
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--ink-soft);
}

.bars {
  display: grid;
  gap: 0.45rem;
  margin: 0.7rem 0;
}

.bar-row {
  display: grid;
  grid-template-columns: 5.5rem 1fr 3.2rem;
  gap: 0.5rem;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.78rem;
}

.bar-track {
  height: 0.7rem;
  background: var(--paper-2);
  border: 1px solid var(--rule);
}

.bar-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-2);
  transition: width 0.18s ease;
}

.bar-row.is-pick .bar-fill { background: var(--accent); }

.chat {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin: 0.4rem 0 0.2rem;
}

.bubble {
  max-width: 92%;
  padding: 0.55rem 0.7rem 0.6rem;
  border: 1px solid var(--rule);
  background: #fffdf8;
  font-size: 0.92rem;
}

.bubble small {
  display: block;
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.bubble.system { border-left: 4px solid var(--accent-2); }
.bubble.user { border-left: 4px solid var(--chip-4); margin-left: auto; }
.bubble.assistant { border-left: 4px solid var(--accent); }
.bubble.tool { border-left: 4px solid var(--chip-3); max-width: 100%; }
.bubble.result { border-left: 4px solid var(--accent-2); margin-left: auto; max-width: 100%; }
.bubble.tool,
.bubble.result {
  font-family: var(--mono);
  font-size: 0.82rem;
}
.bubble pre {
  margin: 0.25rem 0 0;
  padding: 0.45rem 0.5rem;
  font-size: 0.78rem;
}

.remember {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
  margin: 1.3rem 0 1.6rem;
  padding-left: 0;
  counter-reset: step;
}

.remember.four {
  grid-template-columns: repeat(4, 1fr);
}

.remember li {
  list-style: none;
  background: #fffdf8;
  border: 1px solid var(--rule);
  padding: 0.7rem 0.65rem 0.75rem;
  margin: 0;
}

.remember strong {
  display: block;
  font-family: var(--sans);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.remember span {
  font-family: var(--sans);
  font-size: 0.84rem;
  color: var(--ink-soft);
}

.shelf {
  display: grid;
  gap: 0.4rem;
  margin: 0.55rem 0 0.7rem;
}

.card {
  font-family: var(--sans);
  font-size: 0.82rem;
  border: 1px solid var(--rule);
  background: #fffdf8;
  padding: 0.45rem 0.6rem;
  opacity: 0.55;
  transition: opacity 0.2s ease, border-color 0.2s ease;
}

.card.is-hit {
  opacity: 1;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 18%, transparent);
}

.card strong {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 0.15rem;
}

.art {
  margin: 1.5rem 0 0.2rem;
}

.lesson-art {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--rule);
  background: #fffdf8;
}

.ticket-q {
  min-height: 7.5rem;
}

.kind {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0.55rem 0 0.35rem;
}

.cost-line {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent-2);
  margin: 0.55rem 0 0;
}

.btn-row button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--paper-2);
}

.board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.4rem;
  margin: 0.7rem 0 0.35rem;
}

.board-ticket {
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  background: #fffdf8;
  padding: 0.4rem 0.4rem 0.45rem;
  text-align: center;
}

.board-ticket strong {
  display: block;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 0.18rem;
  color: var(--ink);
}

.board-ticket.is-pass {
  border-color: var(--accent-2);
}

.board-ticket.is-pass strong { color: var(--accent-2); }

.board-ticket.is-fail {
  border-color: var(--bad);
}

.board-ticket.is-fail strong { color: var(--bad); }

.board-ticket.is-mute strong { color: var(--ink-soft); }

.board-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin: 0.55rem 0 0.35rem;
}

.board-lane h4 {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 0.25rem;
}

.board-lane[data-lane="cap"] h4 { color: var(--accent); }

.board-lane .board {
  margin: 0;
  grid-template-columns: repeat(2, 1fr);
}

.board-score {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  margin: 0.3rem 0 0;
}

@media (max-width: 52rem) {
  .board {
    grid-template-columns: repeat(2, 1fr);
  }
  .board-pair {
    grid-template-columns: 1fr;
  }
}

.shapes {
  list-style: none;
  padding: 0;
  margin: 1rem 0 1.5rem;
}

.shapes li {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 0.7rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.shapes strong {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.harness-box {
  border: 2px dashed var(--accent-2);
  padding: 0.85rem 0.9rem 0.75rem;
  margin: 0.55rem 0 0.85rem;
  position: relative;
}

.harness-box > .label {
  position: absolute;
  top: -0.55rem;
  left: 0.7rem;
  background: #fffdf8;
  padding: 0 0.35rem;
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.harness-box .pipeline {
  margin: 0.4rem 0 0.2rem;
}

@media (max-width: 52rem) {
  .compare.three {
    grid-template-columns: 1fr;
  }
  .shapes li {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }
  .remember.four {
    grid-template-columns: 1fr 1fr;
  }
}

@media print {
  .token-dot, .pipeline-step.is-live { animation: none; }
  .pipeline-step.is-live { box-shadow: none; }
}