/* ============================================================================
   Deep Dive Lab: shared interactive component library
   Scoped under .ddlab so it never clobbers host-page styles.
   Self-contained: uses BSA tokens when present, falls back otherwise.
   No external dependencies. Respects prefers-reduced-motion.
   Components: comparison-matrix, scenario-simulator, calculator,
   decision-tree, claim-checker, timeline-explorer, tradeoff-card.
   See standards/DEEP_DIVE_STANDARD.md.
   ========================================================================== */
.ddlab {
  --dd-brand: var(--color-brand, #FF7A00);
  --dd-accent: var(--color-gold, #FFD400);
  --dd-bg: var(--color-surface, #1F2024);
  --dd-bg-deep: var(--color-surface-deepest, #272930);
  --dd-border: var(--color-border, #2D2F35);
  --dd-text: var(--color-text, #F2F3F5);
  --dd-muted: var(--color-muted, #A9AEB8);
  --dd-good: #2FbF71;
  --dd-mixed: #E8B23A;
  --dd-bad: #E5564B;
  --dd-radius: var(--radius-lg, 8px);

  display: block;
  margin: 28px 0;
  padding: 20px;
  background: var(--dd-bg);
  border: 1px solid var(--dd-border);
  border-radius: var(--dd-radius);
  color: var(--dd-text);
  font-family: var(--font-sans, 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif);
  line-height: 1.55;
  box-sizing: border-box;
}
.ddlab *, .ddlab *::before, .ddlab *::after { box-sizing: border-box; }
.ddlab__kicker {
  font-size: .72rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--dd-brand); font-weight: 700; margin-bottom: 6px;
}
.ddlab__title { font-size: 1.18rem; font-weight: 700; margin: 0 0 4px; color: var(--dd-text); }
.ddlab__intro { color: var(--dd-muted); font-size: .92rem; margin: 0 0 16px; }
.ddlab__note { color: var(--dd-muted); font-size: .82rem; margin-top: 12px; font-style: italic; }
.ddlab__takeaway {
  margin-top: 14px; padding: 12px 14px; border-left: 3px solid var(--dd-brand);
  background: rgba(255,122,0,.07); border-radius: 0 6px 6px 0; font-size: .9rem;
}
.ddlab button {
  font: inherit; cursor: pointer; border-radius: var(--radius-button, 4px);
  border: 1px solid var(--dd-border); background: var(--dd-bg-deep);
  color: var(--dd-text); padding: 8px 14px; transition: border-color .15s, background .15s;
}
.ddlab button:hover { border-color: var(--dd-brand); }
.ddlab button:focus-visible { outline: 2px solid var(--dd-accent); outline-offset: 2px; }
.ddlab button[aria-pressed="true"], .ddlab .is-active {
  background: var(--dd-brand); border-color: var(--dd-brand); color: #15110a; font-weight: 600;
}

/* --- comparison matrix --- */
.ddlab__matrix-wrap { overflow-x: auto; }
.ddlab table { width: 100%; border-collapse: collapse; font-size: .9rem; }
.ddlab th, .ddlab td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--dd-border); vertical-align: top; }
.ddlab thead th { color: var(--dd-muted); font-weight: 600; position: sticky; top: 0; background: var(--dd-bg); }
.ddlab td.dd-rate { font-weight: 600; white-space: nowrap; }
.ddlab .dd-good { color: var(--dd-good); }
.ddlab .dd-mixed { color: var(--dd-mixed); }
.ddlab .dd-bad { color: var(--dd-bad); }
.ddlab td.dd-dim { color: var(--dd-muted); font-weight: 600; }

/* --- controls (chips / inputs) --- */
.ddlab__chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.ddlab__field { display: grid; gap: 4px; margin-bottom: 12px; }
.ddlab__field label { font-size: .82rem; color: var(--dd-muted); }
.ddlab__field .dd-val { color: var(--dd-accent); font-weight: 700; font-variant-numeric: tabular-nums; }
.ddlab input[type="range"] { width: 100%; accent-color: var(--dd-brand); }
.ddlab input[type="number"] {
  background: var(--dd-bg-deep); border: 1px solid var(--dd-border); color: var(--dd-text);
  padding: 8px 10px; border-radius: 4px; width: 100%;
}
.ddlab__outputs { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 10px; margin-top: 8px; }
.ddlab__out { background: var(--dd-bg-deep); border: 1px solid var(--dd-border); border-radius: 6px; padding: 12px; }
.ddlab__out .dd-out-label { font-size: .74rem; text-transform: uppercase; letter-spacing: .08em; color: var(--dd-muted); }
.ddlab__out .dd-out-value { font-size: 1.35rem; font-weight: 700; font-variant-numeric: tabular-nums; margin-top: 2px; }

/* --- scenario simulator --- */
.ddlab__sim-grid { display: grid; gap: 8px; }
.ddlab__sim-row { display: grid; grid-template-columns: 1fr; gap: 6px; padding: 10px; border: 1px solid var(--dd-border); border-radius: 6px; background: var(--dd-bg-deep); }
.ddlab__sim-sys { font-weight: 700; }
.ddlab__sim-out { font-size: .9rem; color: var(--dd-muted); }
.ddlab__sev { display: inline-block; font-size: .72rem; font-weight: 700; padding: 1px 8px; border-radius: 999px; margin-left: 8px; }
.ddlab__sev.sev-low { background: rgba(47,191,113,.16); color: var(--dd-good); }
.ddlab__sev.sev-med { background: rgba(232,178,58,.16); color: var(--dd-mixed); }
.ddlab__sev.sev-high { background: rgba(229,86,75,.16); color: var(--dd-bad); }

/* --- decision tree --- */
.ddlab__dt-q { font-weight: 600; margin-bottom: 10px; }
.ddlab__dt-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.ddlab__dt-crumbs { font-size: .78rem; color: var(--dd-muted); margin-bottom: 10px; }
.ddlab__dt-leaf { padding: 14px; border: 1px solid var(--dd-brand); border-radius: 8px; background: rgba(255,122,0,.06); }
.ddlab__dt-leaf .dd-leaf-title { font-weight: 700; margin-bottom: 6px; }
.ddlab__dt-boundary { margin-top: 10px; font-size: .82rem; color: var(--dd-accent); border-top: 1px dashed var(--dd-border); padding-top: 8px; }

/* --- claim checker --- */
.ddlab__claim { border: 1px solid var(--dd-border); border-radius: 8px; margin-bottom: 10px; overflow: hidden; }
.ddlab__claim-head { width: 100%; text-align: left; display: flex; justify-content: space-between; gap: 12px; align-items: center; border: 0; border-radius: 0; }
.ddlab__claim-body { padding: 0 14px 14px; display: none; font-size: .9rem; }
.ddlab__claim.is-open .ddlab__claim-body { display: block; }
.ddlab__claim dl { display: grid; grid-template-columns: 130px 1fr; gap: 4px 12px; margin: 0; }
.ddlab__claim dt { color: var(--dd-muted); font-size: .8rem; }
.ddlab__conf { font-size: .72rem; font-weight: 700; padding: 1px 8px; border-radius: 999px; }
.ddlab__conf.c-high { background: rgba(47,191,113,.16); color: var(--dd-good); }
.ddlab__conf.c-med { background: rgba(232,178,58,.16); color: var(--dd-mixed); }
.ddlab__conf.c-low { background: rgba(229,86,75,.16); color: var(--dd-bad); }
.ddlab__claim a { color: var(--dd-accent); }

/* --- timeline explorer --- */
.ddlab__tl { position: relative; }
.ddlab__tl-track { display: flex; gap: 0; overflow-x: auto; padding: 8px 0 4px; }
.ddlab__tl-ev { flex: 0 0 auto; min-width: 96px; text-align: center; position: relative; padding-top: 22px; cursor: pointer; }
.ddlab__tl-ev::before { content: ""; position: absolute; top: 8px; left: 0; right: 0; height: 2px; background: var(--dd-border); }
.ddlab__tl-ev::after { content: ""; position: absolute; top: 4px; left: 50%; transform: translateX(-50%); width: 10px; height: 10px; border-radius: 50%; background: var(--dd-bg); border: 2px solid var(--dd-brand); }
.ddlab__tl-ev.is-active::after { background: var(--dd-brand); }
.ddlab__tl-date { font-size: .74rem; color: var(--dd-accent); font-weight: 700; }
.ddlab__tl-label { font-size: .78rem; color: var(--dd-text); }
.ddlab__tl-detail { margin-top: 12px; padding: 12px 14px; background: var(--dd-bg-deep); border: 1px solid var(--dd-border); border-radius: 6px; font-size: .9rem; min-height: 40px; }
.ddlab__tl-tag { font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; color: var(--dd-muted); }

/* --- tradeoff card --- */
.ddlab--tradeoff .dd-claim { font-weight: 700; margin-bottom: 12px; }
.ddlab__to-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 10px; }
.ddlab__to-cell { background: var(--dd-bg-deep); border: 1px solid var(--dd-border); border-radius: 6px; padding: 12px; }
.ddlab__to-cell h5 { margin: 0 0 4px; font-size: .72rem; text-transform: uppercase; letter-spacing: .07em; color: var(--dd-muted); }
.ddlab__to-cell.dd-improve { border-left: 3px solid var(--dd-good); }
.ddlab__to-cell.dd-harder { border-left: 3px solid var(--dd-bad); }
.ddlab__to-cell.dd-assume { border-left: 3px solid var(--dd-accent); grid-column: 1 / -1; }
.ddlab svg .dd-spark { fill: none; stroke: var(--dd-brand); stroke-width: 2; }

@media (prefers-reduced-motion: reduce) { .ddlab * { transition: none !important; } }
@media (max-width: 560px) { .ddlab__claim dl { grid-template-columns: 1fr; } }