/* ============================================================
   Learning artifacts — styles
   ============================================================ */

.artifact {
  margin: 2.6rem 0;
  background: #fff;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: clamp(1.4rem, 3.5vw, 2.2rem);
}
.artifact-head { margin-bottom: 1.4rem; }
.artifact-head .eyebrow { margin-bottom: 0.4rem; }
.artifact-head h3 { margin: 0 0 0.3rem; }
.artifact-head p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }
.artifact-hint { font-size: 0.78rem; color: var(--sage-deep); margin-top: 0.6rem; font-weight: 500; }

/* ---------- Artifact 1: Two Standards (fixed floor / rising floor) ---------- */
.floors { display: grid; grid-template-columns: 1fr; gap: 1.2rem; }
@media (min-width: 720px) { .floors { grid-template-columns: 1fr 1fr; } }

.floor-col h4 {
  font-family: var(--body); font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-soft); margin: 0 0 0.8rem; font-weight: 600;
}
.floor-track {
  position: relative; background: var(--paper-deep);
  border-radius: var(--radius); padding: 0.5rem; height: 320px;
  display: flex; flex-direction: column; justify-content: flex-end; gap: 0.4rem;
}
/* Fixed floor: flat band */
.fixed-band {
  background: var(--slate); color: #fff; border-radius: 3px;
  padding: 0.8rem 0.9rem; height: 88px; display: flex; flex-direction: column; justify-content: center;
}
.fixed-band .bt { font-weight: 650; font-size: 0.92rem; }
.fixed-band .bs { font-size: 0.78rem; opacity: 0.85; line-height: 1.4; margin-top: 0.2rem; }
.floor-track .empty-note {
  position: absolute; top: 0.9rem; left: 0.9rem; right: 0.9rem;
  font-size: 0.8rem; color: var(--ink-soft); line-height: 1.45;
}
/* Rising floor: three stepped bars */
.rise-steps { display: flex; align-items: flex-end; gap: 0.5rem; height: 100%; }
.rise-step {
  flex: 1; background: var(--sage); color: #fff; border-radius: 3px 3px 0 0;
  padding: 0.6rem 0.5rem; display: flex; flex-direction: column; justify-content: flex-start;
  cursor: pointer; transition: filter 0.18s, transform 0.18s; position: relative;
}
.rise-step:hover { filter: brightness(1.06); }
.rise-step[aria-expanded="true"] { outline: 2px solid var(--slate-deep); outline-offset: 1px; }
.rise-step .sem { font-weight: 650; font-size: 0.8rem; }
.rise-step .lat { font-size: 0.7rem; opacity: 0.9; margin-top: 0.2rem; line-height: 1.3; }
.rise-step.s1 { height: 42%; background: #A7BCAE; }
.rise-step.s2 { height: 68%; background: var(--sage); }
.rise-step.s3 { height: 100%; background: var(--sage-deep); }

.floor-detail {
  margin-top: 1.2rem; background: var(--paper-deep); border-left: 3px solid var(--sage);
  border-radius: 0 var(--radius) var(--radius) 0; padding: 1rem 1.2rem;
  font-size: 0.92rem; color: var(--ink); min-height: 3.4rem;
}
.floor-detail .dl { font-weight: 650; color: var(--slate-deep); display: block; margin-bottom: 0.2rem; }
.floors-key {
  margin-top: 1.1rem; font-size: 0.84rem; color: var(--ink-soft);
  display: flex; gap: 1.2rem; flex-wrap: wrap;
}
.floors-key span { display: inline-flex; align-items: center; gap: 0.4rem; }
.swatch { width: 14px; height: 14px; border-radius: 3px; display: inline-block; }

/* ---------- Artifact 2: Three BIG ideas arc ---------- */
.arc { display: grid; grid-template-columns: 1fr; gap: 0.8rem; }
@media (min-width: 760px) { .arc { grid-template-columns: repeat(3, 1fr); gap: 1rem; } }
.arc-node {
  text-align: left; background: var(--paper-deep); border: 1px solid var(--line-soft);
  border-radius: var(--radius); padding: 1.1rem 1.1rem 1.2rem; cursor: pointer;
  transition: border-color 0.18s, background 0.18s, transform 0.18s; width: 100%; font: inherit; color: inherit;
}
.arc-node:hover { border-color: var(--sage); transform: translateY(-2px); }
.arc-node[aria-expanded="true"] { background: #fff; border-color: var(--slate); }
.arc-node .n { display: block; font-family: var(--display); font-size: 0.8rem; color: var(--sage-deep); font-weight: 600; letter-spacing: 0.06em; }
.arc-node .t { display: block; font-family: var(--display); font-size: 1.12rem; color: var(--slate-deep); font-weight: 600; margin: 0.35rem 0 0.3rem; line-height: 1.25; }
.arc-node .role { display: block; font-size: 0.82rem; color: var(--ink-soft); line-height: 1.45; }
.arc-detail {
  margin-top: 1.1rem; border-left: 3px solid var(--slate); background: var(--paper-deep);
  border-radius: 0 var(--radius) var(--radius) 0; padding: 1.1rem 1.3rem;
  display: none;
}
.arc-detail.show { display: block; animation: fade 0.25s ease; }
.arc-detail h4 { font-family: var(--display); margin: 0 0 0.5rem; color: var(--slate-deep); font-size: 1.15rem; }
.arc-detail p { margin: 0 0 0.8rem; font-size: 0.95rem; }
.arc-detail p:last-child { margin-bottom: 0; }
.arc-thread {
  text-align: center; font-size: 0.84rem; color: var(--ink-soft); margin: 1.1rem 0 0;
  font-style: italic;
}
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------- Artifact 3: Debrief before / after ---------- */
.ba { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 720px) { .ba { grid-template-columns: 1fr 1fr; } }
.ba-col { border-radius: var(--radius); padding: 1.2rem 1.3rem; }
.ba-before { background: var(--paper-deep); border: 1px solid var(--line); }
.ba-after  { background: #fff; border: 1px solid var(--sage); }
.ba-col .tag {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 0.6rem; display: inline-block;
}
.ba-before .tag { color: var(--ink-soft); }
.ba-after .tag { color: var(--sage-deep); }
.ba-col h4 { font-family: var(--display); margin: 0 0 0.6rem; font-size: 1.1rem; color: var(--slate-deep); }
.ba-col p { font-size: 0.93rem; margin: 0 0 0.7rem; }
.ba-col p:last-child { margin-bottom: 0; }
.ba-flow { list-style: none; margin: 0; padding: 0; }
.ba-flow li {
  position: relative; padding: 0.4rem 0 0.4rem 1.5rem; font-size: 0.9rem; color: var(--ink);
  border-bottom: 1px dashed var(--line-soft);
}
.ba-flow li:last-child { border-bottom: 0; }
.ba-flow li::before {
  content: ""; position: absolute; left: 0; top: 0.95rem;
  width: 7px; height: 7px; border-radius: 50%;
}
.ba-before .ba-flow li::before { background: var(--ink-soft); }
.ba-after .ba-flow li::before { background: var(--sage); }
.ba-outcome {
  margin-top: 1.1rem; text-align: center; font-family: var(--display);
  font-size: 1.02rem; color: var(--slate-deep); padding: 0.9rem 1rem;
  background: var(--paper-deep); border-radius: var(--radius);
}