:root {
  --black: #111111;
  --canvas: #f6f1e8;
  --coral: #ff6b4a;
  --cyan: #29c7d8;
  --lime: #b8e63e;
  --ash: #d8d0c5;
  --display: "Space Grotesk", "PingFang SC", "Noto Sans SC", sans-serif;
  --editorial: "Newsreader", "Noto Serif SC", "Songti SC", serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", monospace;
  --page: clamp(20px, 5vw, 76px);
  --max: 1240px;
}

* { box-sizing: border-box; }
html { background: var(--canvas); color: var(--black); scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  font-family: var(--display);
  background:
    linear-gradient(90deg, rgba(17,17,17,.04) 1px, transparent 1px) 0 0 / 72px 72px,
    linear-gradient(0deg, rgba(17,17,17,.035) 1px, transparent 1px) 0 0 / 72px 72px,
    var(--canvas);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.shell { width: min(100%, var(--max)); margin: 0 auto; padding-inline: var(--page); }
.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 var(--page);
  border-bottom: 1px solid rgba(17,17,17,.1);
  background: rgba(246,241,232,.94);
  backdrop-filter: blur(12px);
}
.brand { font-size: 21px; font-weight: 700; }
.brand b { color: var(--coral); }
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a, .eyebrow, .meta, .status-chip {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.nav-links a { color: rgba(17,17,17,.72); }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--black); }
.hero { padding-block: clamp(70px, 10vw, 138px) clamp(64px, 8vw, 108px); }
.eyebrow { margin: 0 0 20px; color: rgba(17,17,17,.72); }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 980px; margin-bottom: 28px; font-size: clamp(48px, 8vw, 104px); line-height: .92; letter-spacing: 0; }
.lede { max-width: 820px; margin-bottom: 30px; font-family: var(--editorial); font-size: clamp(23px, 3vw, 38px); line-height: 1.28; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.status-chip { display: inline-flex; min-height: 30px; align-items: center; padding: 0 10px; border: 1px solid var(--black); background: var(--lime); }
.status-chip.review { background: var(--cyan); }
.status-chip.settle { background: var(--lime); }
.meta { color: rgba(17,17,17,.68); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 0 20px; border: 1.5px solid var(--black); font-weight: 700; }
.button.primary { border-color: var(--coral); background: var(--coral); color: #fff; }
.button:hover, .button:focus-visible { transform: translateY(-2px); }
.band { padding-block: clamp(62px, 8vw, 110px); border-top: 1.5px solid var(--black); }
.band.dark { width: 100%; max-width: none; background: var(--black); color: var(--canvas); }
.band.dark .shell { width: min(100%, var(--max)); }
.section-head { display: grid; grid-template-columns: minmax(150px, .34fr) 1fr; gap: 28px; margin-bottom: 44px; }
.section-head h2 { margin-bottom: 0; font-size: clamp(34px, 5vw, 64px); line-height: .98; letter-spacing: 0; }
.problem-copy { max-width: 790px; font-family: var(--editorial); font-size: clamp(22px, 2.7vw, 34px); line-height: 1.38; }
.audience { max-width: 760px; margin-top: 24px; color: rgba(17,17,17,.68); line-height: 1.7; }
.case-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 30px; }
.case-nav a { padding: 8px 10px; border-bottom: 1px solid rgba(17,17,17,.28); font-family: var(--mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; }
.case-nav a:hover, .case-nav a:focus-visible { border-color: var(--coral); color: var(--coral); }
.architecture { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); border: 1.5px solid var(--black); background: var(--canvas); color: var(--black); }
.arch-step { position: relative; min-height: 176px; padding: 22px 18px; border-right: 1.5px solid var(--black); }
.arch-step:last-child { border-right: 0; }
.arch-step:not(:last-child)::after { content: "→"; position: absolute; right: -13px; top: 22px; z-index: 2; width: 24px; background: var(--canvas); text-align: center; font-weight: 700; }
.arch-no { display: block; margin-bottom: 46px; font-family: var(--mono); font-size: 11px; color: rgba(17,17,17,.58); }
.arch-step strong { display: block; margin-bottom: 8px; font-size: 17px; }
.arch-step p { margin-bottom: 0; color: rgba(17,17,17,.66); font-size: 13px; line-height: 1.55; }
.design-question { display: grid; grid-template-columns: 1.2fr .8fr; gap: clamp(28px, 6vw, 86px); align-items: start; }
.design-question > p { margin-bottom: 0; font-family: var(--editorial); font-size: clamp(30px, 4.2vw, 54px); line-height: 1.16; }
.design-thesis { padding: 24px; border-left: 6px solid var(--coral); background: rgba(255,107,74,.08); }
.design-thesis strong { display: block; margin-bottom: 12px; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
.design-thesis p { margin-bottom: 0; font-size: 16px; line-height: 1.7; }
.turning-list { border-top: 1.5px solid var(--black); }
.turning-row { display: grid; grid-template-columns: 54px minmax(180px,.7fr) minmax(280px,1.1fr) 1fr; gap: 22px; padding: 30px 0; border-bottom: 1px solid rgba(17,17,17,.25); }
.turning-no { font-family: var(--mono); font-size: 12px; color: var(--coral); }
.turning-row h3 { margin-bottom: 0; font-size: 19px; line-height: 1.35; }
.shift { display: grid; gap: 10px; }
.shift-line { display: grid; grid-template-columns: 44px 1fr; gap: 10px; align-items: start; }
.shift-line span { font-family: var(--mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: rgba(17,17,17,.56); }
.shift-line strong { font-size: 15px; line-height: 1.45; }
.turning-why { margin-bottom: 0; color: rgba(17,17,17,.7); font-family: var(--editorial); font-size: 18px; line-height: 1.55; }
.choice-table { border: 1px solid rgba(246,241,232,.42); }
.choice-row { display: grid; grid-template-columns: .8fr 130px 1.4fr; gap: 18px; padding: 20px; border-bottom: 1px solid rgba(246,241,232,.25); }
.choice-row:last-child { border-bottom: 0; }
.choice-row.header { padding-block: 12px; font-family: var(--mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: rgba(246,241,232,.55); }
.choice-row strong { font-size: 17px; }
.choice-verdict { color: var(--lime); font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; }
.choice-row p { margin-bottom: 0; color: rgba(246,241,232,.74); line-height: 1.55; }
.contract-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); border-top: 1.5px solid var(--black); border-left: 1.5px solid var(--black); }
.contract { min-height: 240px; padding: 26px; border-right: 1.5px solid var(--black); border-bottom: 1.5px solid var(--black); }
.contract header { display: flex; justify-content: space-between; gap: 18px; margin-bottom: 36px; }
.contract-no { font-family: var(--mono); font-size: 11px; color: var(--coral); }
.contract h3 { margin-bottom: 0; font-size: 26px; }
.contract p { line-height: 1.65; }
.contract .guardrail { margin-bottom: 0; padding-top: 16px; border-top: 1px solid rgba(17,17,17,.18); color: rgba(17,17,17,.66); font-size: 14px; }
.contract .guardrail strong { color: var(--black); }
.band.signal { background: rgba(41,199,216,.1); }
.transfer-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-top: 1.5px solid var(--black); }
.transfer { padding: 26px 26px 0 0; }
.transfer + .transfer { padding-left: 26px; border-left: 1px solid rgba(17,17,17,.24); }
.transfer-no { display: block; margin-bottom: 34px; font-family: var(--mono); font-size: 11px; }
.transfer h3 { margin-bottom: 12px; font-size: 24px; line-height: 1.15; }
.transfer p { margin-bottom: 0; color: rgba(17,17,17,.68); line-height: 1.65; }
.ownership-list { margin: 0; padding: 0; list-style: none; }
.ownership-list li { padding: 15px 0; border-top: 1px solid rgba(246,241,232,.25); line-height: 1.6; }
.ownership-list li::before { content: "•"; margin-right: 10px; color: var(--coral); }
.basis { margin-top: 50px; padding-top: 22px; border-top: 1px solid rgba(246,241,232,.25); }
.basis h3 { margin-bottom: 18px; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
.basis ol { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 20px; margin: 0; padding: 0; list-style: none; counter-reset: source; }
.basis li { color: rgba(246,241,232,.7); font-size: 13px; line-height: 1.55; counter-increment: source; }
.basis li::before { content: "0" counter(source); display: block; margin-bottom: 10px; color: var(--lime); font-family: var(--mono); }
.evidence-list.light .evidence { border-color: rgba(17,17,17,.2); }
.evidence-list.light .evidence span { color: rgba(17,17,17,.68); }
.evidence-list.light .evidence.open i { border-color: var(--cyan); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(34px, 6vw, 90px); }
.panel-title { margin-bottom: 22px; font-size: 27px; }
.decision-list { margin: 0; padding: 0; list-style: none; }
.decision-list li { padding: 18px 0; border-top: 1px solid rgba(246,241,232,.26); font-family: var(--editorial); font-size: 21px; line-height: 1.45; }
.decision-list li::before { content: "↳"; margin-right: 10px; color: var(--coral); font-family: var(--display); }
.evidence-list { display: grid; gap: 10px; }
.evidence { display: grid; grid-template-columns: 12px 110px 1fr; gap: 12px; align-items: start; padding: 15px 0; border-top: 1px solid rgba(246,241,232,.26); }
.evidence i { width: 10px; height: 10px; margin-top: 5px; border-radius: 50%; background: var(--lime); }
.evidence.open i { background: transparent; border: 1.5px solid var(--cyan); }
.evidence strong { font-size: 14px; }
.evidence span { color: rgba(246,241,232,.72); font-size: 14px; line-height: 1.55; }
.next-box { display: grid; grid-template-columns: .3fr 1fr; gap: 24px; padding: 30px; border: 1.5px solid var(--black); box-shadow: 8px 8px 0 var(--coral); }
.next-box p { margin-bottom: 0; font-family: var(--editorial); font-size: clamp(22px, 2.6vw, 32px); line-height: 1.35; }
.project-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.project-card { display: flex; min-height: 258px; flex-direction: column; justify-content: space-between; padding: 22px; border: 1.5px solid var(--black); background: var(--canvas); transition: transform 150ms ease, box-shadow 150ms ease; }
.project-card:hover, .project-card:focus-visible { transform: translate(-3px,-3px); box-shadow: 6px 6px 0 var(--black); outline: none; }
.project-card h2, .project-card h3 { margin-bottom: 12px; font-size: 29px; line-height: 1.05; }
.project-card p { color: rgba(17,17,17,.68); line-height: 1.6; }
.project-card footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.project-card .arrow { font-size: 22px; }
.timeline-list { border-top: 1.5px solid var(--black); }
.log-entry { display: grid; grid-template-columns: 130px 90px 1fr; gap: 20px; padding: 24px 0; border-bottom: 1px solid rgba(17,17,17,.24); }
.log-entry time, .log-entry .kind { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.log-entry h2 { margin-bottom: 8px; font-size: 24px; }
.log-entry p { margin-bottom: 0; color: rgba(17,17,17,.68); line-height: 1.55; }
.try-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.try-card { padding: 28px; border: 1.5px solid var(--black); }
.try-card.live { box-shadow: inset 0 7px 0 var(--coral); }
.try-card h2 { margin: 38px 0 12px; font-size: clamp(32px, 4vw, 50px); }
.try-card p { max-width: 560px; color: rgba(17,17,17,.68); line-height: 1.65; }
.empty-note { padding: 24px; border-left: 5px solid var(--cyan); background: rgba(41,199,216,.1); line-height: 1.65; }
.footer { padding-block: 36px; border-top: 1.5px solid var(--black); }
.footer .shell { display: flex; justify-content: space-between; gap: 20px; color: rgba(17,17,17,.68); font-size: 13px; }
.error { max-width: 720px; padding: 120px var(--page); margin: auto; }
.error h1 { font-size: clamp(44px, 8vw, 84px); }

/* BookAlive editorial case */
.bookalive-case {
  --ba-ink: #101c2d;
  --ba-paper: #f4efe6;
  --ba-mist: #dceeee;
  --ba-blue: #1f6571;
  --ba-yellow: #f3b63f;
  color: var(--ba-ink);
}
.bookalive-case * { letter-spacing: 0; }
.bookalive-case section[id] { scroll-margin-top: 64px; }
.ba-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(280px, .58fr);
  gap: clamp(42px, 8vw, 120px);
  padding-block: clamp(82px, 11vw, 156px) 44px;
}
.ba-hero-copy h1 {
  max-width: 1000px;
  margin-bottom: 30px;
  font-family: var(--editorial);
  font-size: clamp(52px, 7vw, 90px);
  font-weight: 500;
  line-height: .98;
}
.ba-title-line { display: block; }
.ba-deck {
  max-width: 820px;
  margin-bottom: 0;
  font-size: clamp(20px, 2.3vw, 31px);
  line-height: 1.48;
}
.ba-brief {
  align-self: end;
  padding-top: 18px;
  border-top: 2px solid var(--ba-ink);
}
.ba-brief dl { margin: 0 0 30px; }
.ba-brief dl div {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(16,28,45,.2);
}
.ba-brief dt {
  font-family: var(--mono);
  font-size: 10px;
  color: rgba(16,28,45,.6);
}
.ba-brief dd { margin: 0; font-size: 13px; line-height: 1.55; }
.ba-live-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(184,230,62,.18);
}
.ba-brief .button { width: 100%; }
.ba-case-nav {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  margin-top: clamp(26px, 5vw, 58px);
  border-top: 1px solid rgba(16,28,45,.28);
  border-bottom: 1px solid rgba(16,28,45,.28);
}
.ba-case-nav a {
  padding: 13px 10px;
  border-right: 1px solid rgba(16,28,45,.18);
  font-family: var(--mono);
  font-size: 10px;
  text-align: center;
}
.ba-case-nav a:last-child { border-right: 0; }
.ba-case-nav a:hover, .ba-case-nav a:focus-visible { background: var(--ba-ink); color: var(--canvas); }
.ba-product, .ba-turns, .ba-model, .ba-depth, .ba-evidence {
  padding-block: clamp(72px, 9vw, 124px);
  border-top: 1.5px solid var(--ba-ink);
}
.ba-product { background: var(--ba-ink); color: var(--canvas); }
.ba-section-intro {
  display: grid;
  grid-template-columns: minmax(150px, .34fr) minmax(0, 1fr);
  gap: 20px 42px;
  margin-bottom: 46px;
}
.ba-section-intro .eyebrow { color: currentColor; opacity: .68; }
.ba-section-intro h2 {
  max-width: 820px;
  margin-bottom: 0;
  font-family: var(--editorial);
  font-size: clamp(42px, 5.6vw, 72px);
  font-weight: 500;
  line-height: 1;
}
.ba-section-intro > p:last-child {
  grid-column: 2;
  max-width: 710px;
  margin-bottom: 0;
  color: currentColor;
  opacity: .72;
  font-size: 17px;
  line-height: 1.7;
}
.ba-section-intro.compact { margin-bottom: 58px; }
.ba-product-shot { margin: 0; }
.ba-product-shot a {
  display: block;
  overflow: hidden;
  border: 1px solid rgba(244,239,230,.42);
  background: var(--ba-paper);
}
.ba-product-shot img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 500ms ease;
}
.ba-product-shot a:hover img, .ba-product-shot a:focus-visible img { transform: scale(1.012); }
.ba-product-shot figcaption {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-top: 13px;
  color: rgba(244,239,230,.62);
  font-family: var(--mono);
  font-size: 10px;
}
.ba-product-loop {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 48px;
  border-top: 1px solid rgba(244,239,230,.35);
}
.ba-product-loop div { padding: 22px 24px 0 0; }
.ba-product-loop div + div { padding-left: 24px; border-left: 1px solid rgba(244,239,230,.22); }
.ba-product-loop span, .ba-system-node span, .ba-turn-stage, .ba-turn-decision > span,
.ba-depth-list article > span, .ba-pattern-points span, .ba-final-action span {
  display: block;
  margin-bottom: 9px;
  font-family: var(--mono);
  font-size: 10px;
  color: currentColor;
  opacity: .62;
}
.ba-product-loop strong { font-family: var(--editorial); font-size: 22px; font-weight: 500; }
.ba-tension {
  padding-block: clamp(70px, 9vw, 126px);
  border-top: 1.5px solid var(--ba-ink);
  background: var(--ba-mist);
}
.ba-tension-grid { display: grid; grid-template-columns: 1.12fr .88fr; gap: clamp(42px, 8vw, 118px); }
.ba-tension h2 {
  max-width: 760px;
  margin-bottom: 0;
  font-family: var(--editorial);
  font-size: clamp(46px, 6.2vw, 82px);
  font-weight: 500;
  line-height: 1;
}
.ba-tension-copy { align-self: end; padding-top: 20px; border-top: 2px solid var(--ba-ink); }
.ba-tension-copy p { font-family: var(--editorial); font-size: clamp(19px, 2vw, 25px); line-height: 1.55; }
.ba-tension-copy p:last-child { margin-bottom: 0; }
.ba-turn-list { border-top: 2px solid var(--ba-ink); }
.ba-turn {
  display: grid;
  grid-template-columns: 54px minmax(260px, .9fr) minmax(320px, 1.25fr);
  gap: 28px;
  padding: 34px 0;
  border-bottom: 1px solid rgba(16,28,45,.25);
}
.ba-turn-no { font-family: var(--mono); font-size: 12px; color: var(--coral); }
.ba-turn h3 { max-width: 470px; margin-bottom: 0; font-family: var(--editorial); font-size: clamp(24px, 2.8vw, 38px); font-weight: 500; line-height: 1.15; }
.ba-turn-decision { padding-left: 28px; border-left: 1px solid rgba(16,28,45,.25); }
.ba-turn-decision strong { display: block; margin-bottom: 12px; font-size: 17px; line-height: 1.45; }
.ba-turn-decision p { margin-bottom: 0; color: rgba(16,28,45,.68); line-height: 1.65; }
.ba-model { background: #e9e3d8; }
.ba-model-heading {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: clamp(36px, 7vw, 100px);
  align-items: end;
  margin-bottom: 54px;
}
.ba-model-heading h2, .ba-control-heading h2, .ba-pattern h2, .ba-evidence-heading h2 {
  max-width: 850px;
  margin-bottom: 0;
  font-family: var(--editorial);
  font-size: clamp(43px, 5.7vw, 74px);
  font-weight: 500;
  line-height: 1;
}
.ba-model-heading > p { margin-bottom: 0; font-size: 17px; line-height: 1.7; }
.ba-system-diagram {
  padding: clamp(24px, 4vw, 50px);
  border: 2px solid var(--ba-ink);
  background: var(--ba-paper);
  box-shadow: 12px 12px 0 var(--ba-yellow);
}
.ba-context-row {
  display: grid;
  grid-template-columns: 1fr 34px 1fr 54px 1.25fr;
  gap: 12px;
  align-items: stretch;
}
.ba-system-node {
  min-width: 0;
  padding: 20px;
  border: 1px solid rgba(16,28,45,.42);
  background: rgba(255,255,255,.34);
}
.ba-system-node strong { display: block; margin-bottom: 8px; font-size: 18px; }
.ba-system-node p { margin-bottom: 0; color: rgba(16,28,45,.65); font-size: 13px; line-height: 1.5; }
.ba-system-node.core { border: 2px solid var(--ba-ink); background: var(--ba-ink); color: var(--canvas); }
.ba-system-node.core p { color: rgba(244,239,230,.7); }
.ba-operator { display: grid; place-items: center; font-family: var(--mono); font-size: 20px; }
.ba-runtime-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 34px;
  margin-top: 48px;
}
.ba-runtime-flow .ba-system-node { position: relative; min-height: 150px; }
.ba-runtime-flow .ba-system-node:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -31px;
  top: 50%;
  width: 26px;
  transform: translateY(-50%);
  text-align: center;
  font-family: var(--mono);
  font-weight: 700;
}
.ba-runtime-flow .gate { border: 2px solid var(--coral); background: rgba(255,107,74,.08); }
.ba-evidence-return {
  display: grid;
  grid-template-columns: 130px 1fr 40px;
  gap: 18px;
  align-items: center;
  margin-top: 28px;
  padding: 18px 20px;
  border: 1px solid var(--ba-blue);
  background: var(--ba-mist);
}
.ba-evidence-return span { font-family: var(--mono); font-size: 10px; color: var(--ba-blue); }
.ba-evidence-return strong { font-size: 15px; }
.ba-evidence-return b { font-size: 25px; color: var(--ba-blue); }
.ba-diagram-note { max-width: 760px; margin: 24px 0 0; color: rgba(16,28,45,.62); font-size: 13px; line-height: 1.6; }
.ba-control {
  padding-block: clamp(72px, 9vw, 124px);
  border-top: 1.5px solid var(--ba-ink);
  background: var(--ba-ink);
  color: var(--canvas);
}
.ba-control .eyebrow { color: rgba(244,239,230,.68); }
.ba-control-heading { margin-bottom: 48px; }
.ba-authority-table { border-top: 1px solid rgba(244,239,230,.48); }
.ba-authority-row {
  display: grid;
  grid-template-columns: minmax(190px, .72fr) 130px 1.45fr;
  gap: 24px;
  align-items: start;
  padding: 21px 0;
  border-bottom: 1px solid rgba(244,239,230,.22);
}
.ba-authority-row.head { padding-block: 11px; color: rgba(244,239,230,.5); font-family: var(--mono); font-size: 10px; }
.ba-authority-row strong { font-family: var(--editorial); font-size: 22px; font-weight: 500; }
.ba-authority-row p { margin-bottom: 0; color: rgba(244,239,230,.72); line-height: 1.6; }
.ba-owner { width: fit-content; padding: 5px 8px; border: 1px solid currentColor; font-family: var(--mono); font-size: 10px; }
.ba-owner.agent { color: var(--cyan); }
.ba-owner.human { color: var(--lime); }
.ba-owner.shared { color: var(--ba-yellow); }
.ba-depth-list { border-top: 2px solid var(--ba-ink); }
.ba-depth-list article {
  display: grid;
  grid-template-columns: minmax(130px, .34fr) minmax(260px, .82fr) 1fr;
  gap: 28px;
  padding: 29px 0;
  border-bottom: 1px solid rgba(16,28,45,.25);
}
.ba-depth-list h3 { margin-bottom: 0; font-family: var(--editorial); font-size: clamp(24px, 2.7vw, 36px); font-weight: 500; line-height: 1.15; }
.ba-depth-list p { margin-bottom: 0; color: rgba(16,28,45,.68); line-height: 1.65; }
.ba-pattern {
  padding-block: clamp(72px, 9vw, 124px);
  border-top: 1.5px solid var(--ba-ink);
  background: var(--ba-mist);
}
.ba-pattern-lede { max-width: 800px; margin: 28px 0 54px; font-family: var(--editorial); font-size: clamp(21px, 2.4vw, 30px); line-height: 1.5; }
.ba-pattern-points { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 2px solid var(--ba-ink); }
.ba-pattern-points div { padding: 25px 24px 0 0; }
.ba-pattern-points div + div { padding-left: 24px; border-left: 1px solid rgba(16,28,45,.25); }
.ba-pattern-points strong { display: block; margin-bottom: 12px; font-size: 20px; }
.ba-pattern-points p { margin-bottom: 0; color: rgba(16,28,45,.68); line-height: 1.65; }
.ba-evidence-heading { margin-bottom: 44px; }
.ba-status-list { border-top: 2px solid var(--ba-ink); }
.ba-status-row {
  display: grid;
  grid-template-columns: 130px 180px 1fr;
  gap: 24px;
  padding: 21px 0;
  border-bottom: 1px solid rgba(16,28,45,.24);
}
.ba-status-row > span { font-family: var(--mono); font-size: 10px; color: var(--ba-blue); }
.ba-status-row.open > span { color: #8b6400; }
.ba-status-row p { margin-bottom: 0; color: rgba(16,28,45,.68); line-height: 1.55; }
.ba-ownership {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(38px, 7vw, 100px);
  margin-top: 72px;
  padding-top: 32px;
  border-top: 2px solid var(--ba-ink);
}
.ba-ownership h3 { font-family: var(--editorial); font-size: clamp(28px, 3.2vw, 42px); font-weight: 500; }
.ba-ownership ul { margin: 0; padding: 0; list-style: none; }
.ba-ownership li { padding: 13px 0; border-top: 1px solid rgba(16,28,45,.2); line-height: 1.6; }
.ba-ownership li::before { content: "↳"; margin-right: 9px; color: var(--coral); }
.ba-final-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 80px;
  padding: 28px;
  border: 2px solid var(--ba-ink);
  box-shadow: 9px 9px 0 var(--coral);
}
.ba-final-action strong { display: block; font-family: var(--editorial); font-size: clamp(24px, 3vw, 38px); font-weight: 500; }

@media (max-width: 900px) {
  .architecture { grid-template-columns: repeat(3, 1fr); }
  .arch-step:nth-child(3) { border-right: 0; }
  .arch-step:nth-child(-n+3) { border-bottom: 1.5px solid var(--black); }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .turning-row { grid-template-columns: 44px 1fr 1.3fr; }
  .turning-why { grid-column: 2 / -1; }
  .ba-hero { grid-template-columns: 1fr; }
  .ba-brief { max-width: 650px; }
  .ba-turn { grid-template-columns: 44px 1fr; }
  .ba-turn-decision { grid-column: 2; padding: 20px 0 0; border-top: 1px solid rgba(16,28,45,.2); border-left: 0; }
  .ba-context-row { grid-template-columns: 1fr 28px 1fr; }
  .ba-context-row .ba-operator:nth-of-type(2) { display: none; }
  .ba-system-node.core { grid-column: 1 / -1; margin-top: 12px; }
  .ba-runtime-flow { grid-template-columns: repeat(2, 1fr); row-gap: 34px; }
  .ba-runtime-flow .ba-system-node:nth-child(2)::after { display: none; }
  .ba-depth-list article { grid-template-columns: 120px 1fr; }
  .ba-depth-list p { grid-column: 2; }
}
@media (max-width: 680px) {
  .site-nav { align-items: flex-start; gap: 12px; flex-direction: column; padding-top: 13px; padding-bottom: 13px; }
  .nav-links { width: 100%; justify-content: space-between; gap: 10px; }
  .nav-links a { font-size: 10px; }
  .section-head, .two-col, .next-box, .design-question { grid-template-columns: 1fr; }
  .architecture { grid-template-columns: 1fr; }
  .arch-step { min-height: 130px; border-right: 0; border-bottom: 1.5px solid var(--black); }
  .arch-step:nth-child(-n+3) { border-bottom: 1.5px solid var(--black); }
  .arch-step:last-child { border-bottom: 0; }
  .arch-step:not(:last-child)::after { content: "↓"; right: 20px; top: auto; bottom: -13px; }
  .arch-no { margin-bottom: 24px; }
  .project-grid, .try-grid { grid-template-columns: 1fr; }
  .turning-row { grid-template-columns: 34px 1fr; gap: 14px; }
  .turning-row h3, .turning-row .shift, .turning-why { grid-column: 2; }
  .choice-row, .choice-row.header { grid-template-columns: 1fr; gap: 8px; }
  .choice-row.header { display: none; }
  .contract-grid, .transfer-grid, .basis ol { grid-template-columns: 1fr; }
  .contract { min-height: auto; }
  .transfer { padding: 24px 0; border-bottom: 1px solid rgba(17,17,17,.24); }
  .transfer + .transfer { padding-left: 0; border-left: 0; }
  .transfer-no { margin-bottom: 18px; }
  .log-entry { grid-template-columns: 1fr; gap: 8px; }
  .footer .shell { flex-direction: column; }
  .ba-hero { padding-top: 62px; }
  .bookalive-case section[id] { scroll-margin-top: 104px; }
  .ba-hero-copy h1 { font-size: clamp(44px, 13.5vw, 58px); line-height: 1.02; }
  .ba-deck { font-size: 19px; }
  .ba-case-nav { grid-template-columns: repeat(3, 1fr); }
  .ba-case-nav a:nth-child(3) { border-right: 0; }
  .ba-case-nav a:nth-child(-n+3) { border-bottom: 1px solid rgba(16,28,45,.18); }
  .ba-section-intro, .ba-tension-grid, .ba-model-heading, .ba-ownership { grid-template-columns: 1fr; }
  .ba-section-intro > p:last-child { grid-column: 1; }
  .ba-product-shot figcaption { flex-direction: column; gap: 6px; }
  .ba-product-loop, .ba-pattern-points { grid-template-columns: 1fr; }
  .ba-product-loop div, .ba-product-loop div + div, .ba-pattern-points div, .ba-pattern-points div + div { padding: 18px 0; border-left: 0; border-bottom: 1px solid rgba(244,239,230,.2); }
  .ba-pattern-points div, .ba-pattern-points div + div { border-bottom-color: rgba(16,28,45,.22); }
  .ba-turn { grid-template-columns: 32px 1fr; gap: 14px; }
  .ba-context-row { grid-template-columns: 1fr; }
  .ba-operator { min-height: 24px; }
  .ba-operator:first-of-type { font-size: 0; }
  .ba-operator:first-of-type::after { content: "+"; font-size: 20px; }
  .ba-context-row .ba-operator:nth-of-type(2) { display: grid; font-size: 0; }
  .ba-context-row .ba-operator:nth-of-type(2)::after { content: "↓"; font-size: 20px; }
  .ba-runtime-flow { grid-template-columns: 1fr; }
  .ba-runtime-flow .ba-system-node { min-height: 0; }
  .ba-runtime-flow .ba-system-node:not(:last-child)::after { content: "↓"; right: 18px; top: auto; bottom: -31px; transform: none; }
  .ba-runtime-flow .ba-system-node:nth-child(2)::after { display: block; }
  .ba-evidence-return { grid-template-columns: 1fr 32px; }
  .ba-evidence-return span { grid-column: 1 / -1; }
  .ba-authority-row, .ba-depth-list article, .ba-status-row { grid-template-columns: 1fr; gap: 9px; }
  .ba-authority-row.head { display: none; }
  .ba-depth-list p { grid-column: 1; }
  .ba-final-action { align-items: stretch; flex-direction: column; }
  .ba-final-action .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}