/* The Brain (defense/brain.html): a sticky 3D stage, the cards scroll past it and decide what lights.
   Desktop: stage left, cards right. Below 980px: stage pinned on top, cards underneath. */
.brain-body { background: #04060b; }

.brain-lab { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); max-width: 1480px; margin: 0 auto; }
.brain-stage {
  position: sticky; top: var(--brain-top, 0px); height: calc(100vh - var(--brain-top, 0px)); min-height: 420px; overflow: hidden; touch-action: pan-y;
  background:
    radial-gradient(60% 55% at 50% 48%, rgba(56, 108, 190, .20), transparent 70%),
    radial-gradient(40% 40% at 50% 55%, rgba(120, 80, 255, .10), transparent 70%),
    #04060b;
  cursor: grab;
}
.brain-stage:active { cursor: grabbing; }
.brain-stage::after { /* scan lines: the instrument look, not decoration on top of text */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(to bottom, rgba(255, 255, 255, .025) 0 1px, transparent 1px 3px);
}
#brain-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.brain-labels { position: absolute; inset: 0; pointer-events: none; }
.brain-label {
  position: absolute; left: 0; top: 0; pointer-events: auto; white-space: nowrap;
  font: 600 11px/1 ui-monospace, "SF Mono", Menlo, monospace; letter-spacing: .06em; text-transform: uppercase;
  color: #dfe8f5; background: rgba(4, 8, 16, .72); border: 1px solid color-mix(in srgb, var(--sys) 55%, transparent);
  border-radius: 999px; padding: 6px 10px; transition: opacity .35s ease, box-shadow .35s ease; opacity: 0; cursor: pointer;
}
.brain-label.is-lit { color: #04060b; background: var(--sys); box-shadow: 0 0 22px color-mix(in srgb, var(--sys) 70%, transparent); }
.brain-label:focus-visible, .brain-sys:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.brain-legend { position: absolute; left: 16px; right: 16px; bottom: 16px; display: flex; flex-wrap: wrap; gap: 6px; z-index: 2; }
.brain-sys {
  display: inline-flex; align-items: center; gap: 7px; cursor: pointer;
  font: 600 11px/1 ui-monospace, "SF Mono", Menlo, monospace; letter-spacing: .1em;
  color: #cfd9e8; background: rgba(4, 8, 16, .7); border: 1px solid rgba(160, 185, 220, .22); border-radius: 999px; padding: 8px 11px;
}
.brain-sys[aria-pressed="true"] { border-color: var(--sys); color: #fff; box-shadow: inset 0 0 0 1px var(--sys); }
.brain-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--sys, #7fa8d8); box-shadow: 0 0 10px var(--sys, #7fa8d8); flex: none; }
.brain-hint { position: absolute; top: 16px; left: 16px; margin: 0; color: #8193ab; font: 12px/1.4 ui-monospace, Menlo, monospace; z-index: 2; }
.brain-fallback { position: absolute; inset: auto 24px 50% 24px; text-align: center; color: #b0bbca; }
.brain-stage.is-fallback { height: auto; min-height: 0; position: relative; padding: 48px 0; }

.brain-cards { padding: 0 clamp(16px, 3vw, 44px) 20vh; }
.brain-card {
  min-height: 64vh; display: flex; flex-direction: column; justify-content: center; text-align: left;
  padding: 28px 0 28px 22px; border-left: 2px solid color-mix(in srgb, var(--sys, #7fa8d8) 30%, transparent);
  opacity: .5; transition: opacity .4s ease, border-color .4s ease;
}
.brain-card.is-active { opacity: 1; border-left-color: var(--sys, #7fa8d8); }
.brain-card h1 { font-size: clamp(2.1rem, 3.6vw, 3.4rem); margin: 14px 0 18px; text-align: left; max-width: none; }
.brain-card h3 { font-size: clamp(1.5rem, 2.2vw, 2.1rem); margin: 10px 0 12px; }
.brain-card p { margin: 0 0 12px; line-height: 1.65; color: #c9d3e1; }
.brain-card .lede { margin: 0 0 22px; font-size: clamp(1.02rem, 1.3vw, 1.18rem); text-align: left; }
.brain-intro { min-height: 92vh; opacity: 1; }
.brain-chip { display: flex; align-items: center; gap: 9px; font: 600 11px/1 ui-monospace, Menlo, monospace; letter-spacing: .14em; text-transform: uppercase; color: var(--sys, #82decf); }
.brain-measured { border-top: 1px solid rgba(155, 180, 210, .14); padding-top: 12px; }
.brain-measured b, .brain-removes b { display: block; font: 600 10px/1 ui-monospace, Menlo, monospace; letter-spacing: .16em; text-transform: uppercase; color: #8193ab; margin-bottom: 6px; }
.brain-code { font: 12px/1.4 ui-monospace, Menlo, monospace; color: #7d8ca2; }
.brain-small { font-size: .92rem; color: #93a2b8 !important; }
.brain-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 0 0 20px; }
.brain-stats div { background: rgba(14, 22, 38, .75); border: 1px solid rgba(155, 180, 210, .14); border-radius: 12px; padding: 14px; }
.brain-stats b { display: block; font-size: clamp(1.5rem, 2.4vw, 2.2rem); line-height: 1.1; margin-bottom: 6px;
  background: linear-gradient(90deg, #63e3ff, #a88cff 55%, #ffb454); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brain-stats span { font-size: .85rem; color: #a7b4c7; line-height: 1.4; display: block; }
.brain-divider { margin: 18vh 0 4vh; font-size: clamp(1.6rem, 2.6vw, 2.4rem); text-align: left; }
.brain-remove ul { margin: 0; padding-left: 18px; line-height: 1.9; color: #c9d3e1; }
.brain-remove b { color: #ff8d9c; }
.brain-ms-n { color: #63e3ff; }
.brain-ms-st { padding: 5px 8px; border-radius: 6px; border: 1px solid rgba(160, 185, 220, .3); color: #b8c5d8; }
.brain-ms[data-status="running"] .brain-ms-st { border-color: #7dffb2; color: #7dffb2; }
.brain-ms[data-status="next"] .brain-ms-st { border-color: #ffb454; color: #ffb454; }
.brain-more { color: #63e3ff; }

/* ---- the full-width sections under the stage */
.brain-band { text-align: left; max-width: 980px; }
.brain-band h2 { text-align: left; }
.brain-band h3 { margin: 42px 0 12px; font-size: 1.35rem; }
.brain-band .lede { margin-left: 0; text-align: left; }
.brain-chain, .brain-pipe { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 24px 0; counter-reset: step; }
.brain-chain li, .brain-pipe li {
  position: relative; padding: 12px 16px; border-radius: 10px; background: rgba(14, 22, 38, .85);
  border: 1px solid color-mix(in srgb, var(--sys, #ffb454) 55%, transparent); font: 600 12px/1.3 ui-monospace, Menlo, monospace;
  letter-spacing: .08em; text-transform: uppercase; color: #e6edf7;
}
.brain-chain li:not(:last-child)::after, .brain-pipe li:not(:last-child)::after { content: "→"; position: absolute; right: -10px; top: 50%; transform: translate(50%, -50%); color: #8193ab; }
.brain-chain li:last-child { border-color: #7dffb2; }
.brain-vs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0; }
.brain-vs div { padding: 18px; border-radius: 12px; background: rgba(14, 22, 38, .85); border: 1px solid rgba(155, 180, 210, .16); }
.brain-vs div:last-child { border-color: #ff5d73; }
.brain-vs b { display: block; font: 600 11px/1 ui-monospace, Menlo, monospace; letter-spacing: .16em; text-transform: uppercase; color: #8193ab; margin-bottom: 8px; }
.brain-vs span { font-size: 1.15rem; color: #eef3fa; }
.brain-metrics { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 22px; padding-left: 18px; line-height: 1.6; color: #c9d3e1; }
.brain-sources { font-size: .88rem; line-height: 1.8; padding-left: 18px; }
.brain-scope { margin: 34px 0; padding: 18px 20px; border-radius: 12px; border: 1px solid rgba(255, 93, 115, .5); background: rgba(40, 10, 18, .35); }
.brain-scope b { font: 600 11px/1 ui-monospace, Menlo, monospace; letter-spacing: .16em; text-transform: uppercase; color: #ff8d9c; }
.brain-scope p { margin: 8px 0 0; }
.brain-close { font-size: clamp(1.5rem, 2.8vw, 2.4rem); line-height: 1.3; font-weight: 700; margin: 42px 0 10px; color: #fff; }
.brain-limits { padding-left: 18px; line-height: 1.8; color: #c9d3e1; }

@media (max-width: 979px) {
  .brain-lab { grid-template-columns: minmax(0, 1fr); }
  .brain-stage { height: 46vh; min-height: 300px; z-index: 3; box-shadow: 0 10px 30px rgba(0, 0, 0, .6); }
  .brain-media-cap { display: none; }
  .brain-hint { display: none; }
  .brain-legend { left: 10px; right: 10px; bottom: 10px; gap: 4px; }
  .brain-sys { padding: 6px 8px; font-size: 10px; }
  .brain-cards { padding: 0 16px 30vh; }
  .brain-card { min-height: 58vh; padding-left: 14px; }
  .brain-intro { min-height: auto; padding-top: 36px; }
  .brain-stats { grid-template-columns: minmax(0, 1fr); }
  .brain-vs, .brain-metrics { grid-template-columns: minmax(0, 1fr); }
  .brain-divider { margin-top: 10vh; }
}
@media (prefers-reduced-motion: reduce) {
  .brain-card, .brain-label { transition: none; }
}

/* ---- lineage, stack, questions, thesis (brain-factory + the origin band) */
.brain-sub { font-style: italic; color: #e6edf7 !important; }
.brain-thesis { font-size: clamp(1.3rem, 2vw, 1.7rem); font-weight: 700; margin: 0 0 4px !important; color: #fff !important; }
.brain-thesis-sub { font: 600 12px/1.4 ui-monospace, Menlo, monospace; letter-spacing: .18em; text-transform: uppercase; color: #63e3ff !important; margin-bottom: 18px !important; }
.brain-lineage li { border-color: rgba(168, 140, 255, .5); }
.brain-stack { list-style: none; padding: 0; margin: 20px 0; display: grid; gap: 8px; }
.brain-stack li { display: grid; grid-template-columns: 160px 1fr; gap: 14px; align-items: center; padding: 14px 16px; border-radius: 10px;
  background: rgba(14, 22, 38, .85); border: 1px solid color-mix(in srgb, var(--sys) 55%, transparent); position: relative; }
.brain-stack li:not(:last-child)::after { content: "↓"; position: absolute; left: 24px; bottom: -14px; color: #8193ab; z-index: 1; }
.brain-stack b { font: 700 12px/1.2 ui-monospace, Menlo, monospace; letter-spacing: .14em; text-transform: uppercase; color: var(--sys); }
.brain-stack span { color: #c9d3e1; }
.brain-questions { padding-left: 22px; line-height: 1.9; font-size: 1.12rem; color: #e6edf7; }
.brain-taught { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 22px; color: #c9d3e1; line-height: 1.6; }
.brain-taught b { color: #fff; }

/* ---- proof: one card per lane */
.proof.brain-band { max-width: 1240px; }
.proof-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin: 28px 0; }
.proof-card { background: rgba(10, 16, 28, .9); border: 1px solid rgba(155, 180, 210, .14); border-radius: 14px; overflow: hidden; display: flex; flex-direction: column; }
.proof-card[data-tone="good"] { border-top: 2px solid #7dffb2; }
.proof-card[data-tone="flat"] { border-top: 2px solid #8193ab; }
.proof-media { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #000; }
.proof-body { padding: 16px 18px 18px; }
.proof-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; margin: 0 0 8px; }
.proof-head b { font-size: 1.1rem; color: #fff; }
.proof-verdict { font: 600 10px/1 ui-monospace, Menlo, monospace; letter-spacing: .12em; text-transform: uppercase; padding: 5px 8px; border-radius: 6px; border: 1px solid currentColor; white-space: nowrap; }
.proof-card[data-tone="good"] .proof-verdict { color: #7dffb2; }
.proof-card[data-tone="flat"] .proof-verdict { color: #a7b4c7; }
.proof-headline { color: #dfe7f2; line-height: 1.6; margin: 0 0 12px; }
.proof-facts { margin: 10px 0 0; padding-left: 18px; color: #a7b4c7; font-size: .92rem; line-height: 1.6; }
.proof-source { margin: 12px 0 0; font-size: .8rem; color: #7d8ca2; }
.proof-source code { font-size: .78rem; color: #93a2b8; word-break: break-all; }
.proof-table { font-size: .82rem; margin-top: 8px; }
.brain-chart { width: 100%; height: auto; display: block; margin: 8px 0 4px; }
.bc-grid { stroke: rgba(155, 180, 210, .12); stroke-width: 1; }
.bc-zero { stroke: rgba(155, 180, 210, .45); stroke-width: 1; }
.bc-gate { stroke: #ffb454; stroke-width: 1.2; stroke-dasharray: 5 4; }
.bc-gate-t { fill: #ffb454; font: 10px ui-monospace, Menlo, monospace; }
.bc-tick, .bc-axis { fill: #7d8ca2; font: 10px ui-monospace, Menlo, monospace; }
.bc-end { font: 600 11px ui-monospace, Menlo, monospace; }
.bc-name { fill: #c9d3e1; font: 11px ui-monospace, Menlo, monospace; }
.bc-val { fill: #e6edf7; font: 600 11px ui-monospace, Menlo, monospace; }

@media (max-width: 979px) {
  .proof-grid, .brain-taught { grid-template-columns: minmax(0, 1fr); }
  .brain-stack li { grid-template-columns: minmax(0, 1fr); gap: 4px; }
}

/* the site's .band centres its text; these sections read left to right */
.brain-band p, .brain-band li, .brain-band h3, .proof-body, .proof-body p, .proof-body li { text-align: left; }
.brain-band .lede, .brain-band p { margin-left: 0; margin-right: 0; }
.proof-media { object-fit: contain; }

/* footage in place of the brain (a card with data-media): the brain fades out, the recording plays */
#brain-canvas, .brain-labels { transition: opacity .5s ease; }
.brain-media { display: none; position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; background: #04060b;
  pointer-events: none; z-index: 1; }
.brain-media-cap { display: none; position: absolute; left: 16px; right: 16px; top: 14px; margin: 0; z-index: 2;
  font: 12px/1.4 ui-monospace, Menlo, monospace; color: #cfd9e8; }
/* shown/hidden outright: an opacity fade on an element that starts hidden can stick half-way (seen 2026-09-28) */
.brain-stage.is-media .brain-media, .brain-stage.is-media .brain-media-cap { display: block; }
.brain-stage.is-media #brain-canvas, .brain-stage.is-media .brain-labels, .brain-stage.is-media .brain-hint { opacity: 0; }
@media (prefers-reduced-motion: reduce) { #brain-canvas, .brain-labels { transition: none; } }