/* ============================================================
   Background / Science page styles
   ============================================================ */

.bg-hero {
  background: var(--aud-slate-800);
  color: #fff;
  padding: 96px 0 64px;
}
.bg-hero h1 {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 16px 0 20px;
  color: #fff;
  max-width: 820px;
}
.bg-hero p {
  font-size: 18px;
  line-height: 1.55;
  color: #cbd5e1;
  max-width: 720px;
  margin: 0;
}

/* ---------- Conditions matrix ---------- */
.bg-matrix {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  margin-top: 48px;
  align-items: stretch;
}
.bg-conds {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.bg-cond {
  background: var(--aud-white);
  border: 0.5px solid var(--aud-border);
  border-radius: 10px;
  padding: 14px 16px;
  cursor: pointer;
  text-align: left;
  font-family: var(--aud-font-sans);
  font-size: 14px;
  color: var(--aud-fg-2);
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 150ms cubic-bezier(0.4,0,0.2,1);
}
.bg-cond:hover { border-color: var(--aud-border-strong); color: var(--aud-ink); }
.bg-cond[aria-pressed="true"] {
  background: var(--aud-white);
  color: var(--aud-ink);
  border-left: 2px solid var(--aud-brand);
  border-radius: 0 10px 10px 0;
  box-shadow: var(--aud-shadow-2);
  font-weight: 500;
}
.bg-cond .ic {
  width: 20px; height: 20px; flex-shrink: 0;
  color: var(--aud-fg-3);
}
.bg-cond[aria-pressed="true"] .ic { color: var(--aud-brand); }
.bg-cond .lbl-meta {
  font-family: var(--aud-font-mono);
  font-size: 10px;
  color: var(--aud-fg-3);
  margin-left: auto;
  letter-spacing: 0.05em;
}

.bg-cond-detail {
  background: var(--aud-white);
  border: 0.5px solid var(--aud-border);
  border-radius: 12px;
  padding: 32px;
  min-height: 420px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.bg-cond-detail__head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 24px;
  padding-bottom: 20px;
  border-bottom: 0.5px solid var(--aud-border);
}
.bg-cond-detail__head h3 {
  font-size: 24px; font-weight: 500; letter-spacing: -0.015em;
  margin: 0; color: var(--aud-ink);
}
.bg-cond-detail__head .meta {
  font-family: var(--aud-font-mono);
  font-size: 11px; letter-spacing: 0.06em;
  color: var(--aud-fg-3); text-transform: uppercase;
}
.bg-cond-detail__sum { font-size: 15px; line-height: 1.6; color: var(--aud-fg-2); margin: 0; }
.bg-cond-detail__feats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
}
.bg-cond-detail__feat {
  background: var(--aud-surface);
  border: 0.5px solid var(--aud-border);
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 13px;
  display: flex; flex-direction: column; gap: 4px;
}
.bg-cond-detail__feat .name { font-weight: 500; color: var(--aud-ink); }
.bg-cond-detail__feat .why { color: var(--aud-fg-2); line-height: 1.5; }
.bg-cond-detail__feat .pct {
  font-family: var(--aud-font-mono); font-size: 11px;
  color: var(--aud-brand); margin-top: 4px;
}
.bg-cond-detail__tasks {
  display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto;
  padding-top: 16px; border-top: 0.5px solid var(--aud-border);
}

@media (max-width: 880px) {
  .bg-matrix { grid-template-columns: 1fr; }
  .bg-cond-detail__feats { grid-template-columns: 1fr; }
}

/* ---------- Feature explorer (hover) ---------- */
.bg-explorer {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 32px;
  margin-top: 48px;
  align-items: stretch;
}
.bg-feat-list {
  display: flex; flex-direction: column; gap: 6px;
}
.bg-feat-btn {
  background: var(--aud-white);
  border: 0.5px solid var(--aud-border);
  border-radius: 10px;
  padding: 16px 18px;
  cursor: pointer;
  text-align: left;
  display: flex; flex-direction: column; gap: 4px;
  transition: all 150ms cubic-bezier(0.4,0,0.2,1);
}
.bg-feat-btn:hover { border-color: var(--aud-border-strong); }
.bg-feat-btn[aria-pressed="true"] {
  border-left: 2px solid var(--aud-brand);
  border-radius: 0 10px 10px 0;
  background: var(--aud-white);
  box-shadow: var(--aud-shadow-2);
}
.bg-feat-btn .lbl {
  font-family: var(--aud-font-mono); font-size: 10px;
  color: var(--aud-fg-3); letter-spacing: 0.07em; text-transform: uppercase;
}
.bg-feat-btn .name {
  font-size: 16px; font-weight: 500; color: var(--aud-ink); letter-spacing: -0.01em;
}

.bg-feat-detail {
  background: var(--aud-slate-800);
  border-radius: 12px;
  padding: 32px;
  color: #fff;
  min-height: 420px;
  display: flex; flex-direction: column;
}
.bg-feat-detail__head {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 16px;
}
.bg-feat-detail__head h3 {
  font-size: 22px; font-weight: 500; letter-spacing: -0.015em;
  color: #fff; margin: 0 0 4px 0;
}
.bg-feat-detail__head .formula {
  font-family: var(--aud-font-mono); font-size: 11px; color: #94a3b8;
}
.bg-feat-detail__viz {
  background: rgba(255,255,255,0.03);
  border-radius: 8px;
  border: 0.5px solid rgba(255,255,255,0.08);
  padding: 16px;
  height: 140px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.bg-feat-detail__viz svg { width: 100%; height: 100%; }
.bg-feat-detail__desc {
  font-size: 14px; line-height: 1.6; color: #cbd5e1; margin: 0 0 16px 0;
}
.bg-feat-detail__cond {
  font-family: var(--aud-font-mono); font-size: 11px; letter-spacing: 0.07em;
  color: #94a3b8; text-transform: uppercase; margin-bottom: 12px;
}
.bg-feat-detail__chips {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.bg-chip {
  display: inline-flex; align-items: center;
  font-family: var(--aud-font-sans); font-size: 12px; font-weight: 400;
  background: rgba(255,255,255,0.06);
  border: 0.5px solid rgba(255,255,255,0.12);
  color: #cbd5e1; padding: 4px 10px; border-radius: 999px;
}
.bg-chip strong { font-weight: 500; color: #fff; }

@media (max-width: 880px) {
  .bg-explorer { grid-template-columns: 1fr; }
}

/* ---------- Live demo ---------- */
.bg-demo {
  background: var(--aud-ink);
  color: #fff;
  border-radius: 16px;
  padding: 48px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
  border: 0.5px solid rgba(255,255,255,0.08);
}
.bg-demo__viz {
  background: rgba(255,255,255,0.03);
  border-radius: 12px;
  border: 0.5px solid rgba(255,255,255,0.08);
  padding: 24px;
  display: flex; flex-direction: column;
  height: 360px;
}
.bg-demo__viz-head {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--aud-font-mono); font-size: 11px; color: #94a3b8;
  letter-spacing: 0.06em; text-transform: uppercase;
  margin-bottom: 16px;
}
.bg-demo__viz canvas { flex: 1; width: 100%; display: block; }
.bg-demo__viz-feats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  padding-top: 14px; margin-top: 14px;
  border-top: 0.5px solid rgba(255,255,255,0.08);
}
.bg-demo__viz-feats .lbl {
  font-family: var(--aud-font-mono); font-size: 10px; letter-spacing: 0.07em;
  text-transform: uppercase; color: #94a3b8;
}
.bg-demo__viz-feats .val {
  font-family: var(--aud-font-mono); font-size: 16px; color: #fff;
  font-feature-settings: "tnum"; letter-spacing: -0.01em;
}
.bg-demo h2 {
  font-size: clamp(28px, 3.2vw, 38px);
  font-weight: 500; letter-spacing: -0.02em; line-height: 1.1;
  color: #fff; margin: 16px 0 16px 0;
}
.bg-demo p { color: #cbd5e1; line-height: 1.6; max-width: 480px; margin: 0 0 24px 0; }
.bg-demo__cta { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.bg-demo__note {
  font-family: var(--aud-font-mono); font-size: 11px; color: #94a3b8;
  letter-spacing: 0.05em; margin-top: 16px;
}
.bg-demo__rec-state {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--aud-font-mono); font-size: 11px; color: #cbd5e1;
}
.bg-demo__rec-state .dot {
  width: 8px; height: 8px; border-radius: 999px; background: #64748b;
}
.bg-demo__rec-state.is-rec .dot { background: #ef4444; animation: pulseRec 1.2s infinite; }
@keyframes pulseRec {
  0%,100% { box-shadow: 0 0 0 0 rgba(239,68,68,0.6); }
  50% { box-shadow: 0 0 0 6px rgba(239,68,68,0); }
}
@media (max-width: 880px) {
  .bg-demo { grid-template-columns: 1fr; padding: 32px; }
  .bg-demo__viz { height: 300px; }
}

/* ---------- Tasks grid ---------- */
.bg-tasks {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
  margin-top: 48px;
}
.bg-task {
  background: var(--aud-white); border: 0.5px solid var(--aud-border);
  border-radius: 12px; padding: 24px;
  display: flex; flex-direction: column; gap: 12px;
}
.bg-task .num {
  font-family: var(--aud-font-mono); font-size: 11px; color: var(--aud-brand);
  letter-spacing: 0.06em;
}
.bg-task h3 { font-size: 17px; font-weight: 500; margin: 0; letter-spacing: -0.01em; color: var(--aud-ink); }
.bg-task p { font-size: 13px; line-height: 1.55; color: var(--aud-fg-2); margin: 0; }
.bg-task .dur { font-family: var(--aud-font-mono); font-size: 11px; color: var(--aud-fg-3); margin-top: auto; }
@media (max-width: 880px) { .bg-tasks { grid-template-columns: 1fr; } }