/*
 * Reasons page / DS v0.6 cross-page adoption.
 * Scope: #page-reasons.reasons-ds-v1 only. Shared header/footer remain untouched.
 */
#page-reasons.reasons-ds-v1 {
  --reasons-ink:#0D1926;
  --reasons-navy:#1A314B;
  --reasons-teal:#1F6C6D;
  --reasons-coral:#FD604A;
  --reasons-lilac:#E8BFE6;
  --reasons-body:#494A4A;
  --reasons-muted:#626263;
  --reasons-cool:#ECF0F4;
  --reasons-lit:linear-gradient(212.5deg in srgb,#101E2F 43.91%,#354E6A 97.43%);
  --reasons-warm:linear-gradient(161.15deg in srgb,#FF9974 8.73%,#FF5212 88.52%);
  --reasons-plum:linear-gradient(202.3deg in srgb,#E8BFE6 8.44%,#D394D3 99.29%);
  --reasons-teal-lit:linear-gradient(190.05deg in srgb,#206C6D 21.26%,#2D8C8E 94.64%);
  --reasons-rim:linear-gradient(135deg in srgb,rgba(232,191,230,.7),rgba(253,96,74,.32) 50%,rgba(179,204,212,.55));
  --reasons-rule:linear-gradient(90deg in srgb,#E8BFE6,#FD604A 55%,#B3CCD4);
  background:#fff;
  color:var(--reasons-body);
}
#page-reasons.reasons-ds-v1 > section { position:relative; }
#page-reasons.reasons-ds-v1 .wrap { width:min(calc(100% - 48px),1240px); max-width:1240px; padding-inline:0; }

/* 01 / Primary narrative: the proof lineage is the focal point. */
#page-reasons.reasons-ds-v1 .reasons-hero {
  position:relative;
  isolation:isolate;
  overflow:hidden;
  padding:var(--ob-shell-hero-pad-top) 0 var(--ob-shell-hero-pad-bottom);
  color:#fff;
  text-align:left;
  background-color:#101e2f;
  background-image:var(--reasons-lit);
}
#page-reasons.reasons-ds-v1 .reasons-hero::before {
  content:"";
  position:absolute;
  inset:-120px -80px auto auto;
  width:430px;
  height:430px;
  z-index:-1;
  pointer-events:none;
  background:radial-gradient(circle,rgba(232,191,230,.24) 1px,transparent 1.5px) 0 0/16px 16px;
  -webkit-mask-image:radial-gradient(circle at center,#000 15%,transparent 72%);
  mask-image:radial-gradient(circle at center,#000 15%,transparent 72%);
}
#page-reasons.reasons-ds-v1 .reasons-hero::after {
  content:"";
  position:absolute;
  left:-130px;
  bottom:-190px;
  width:520px;
  height:390px;
  z-index:-1;
  pointer-events:none;
  border-radius:50%;
  background:radial-gradient(ellipse at center,rgba(253,96,74,.18),transparent 66%);
}
#page-reasons.reasons-ds-v1 .reasons-hero .wrap { position:relative; z-index:1; }
#page-reasons.reasons-ds-v1 .reasons-hero .tag {
  display:flex;
  align-items:center;
  gap:11px;
  margin:0 0 22px;
  color:rgba(255,255,255,.78);
  font-family:var(--ob-font-latin);
  font-size:12px;
  font-weight:500;
  letter-spacing:.14em;
}
#page-reasons.reasons-ds-v1 .reasons-hero .tag::before {
  content:"";
  width:var(--ob-shell-hero-marker-width);
  height:var(--ob-shell-marker-height);
  border-radius:2px;
  background:var(--reasons-coral);
}
#page-reasons.reasons-ds-v1 .reasons-hero h1 {
  width:min(100%,1080px);
  max-width:1080px;
  margin:0;
  color:#fff;
  font-size:clamp(42px,4.4vw,62px);
  font-weight:500;
  line-height:1.34;
  letter-spacing:-.035em;
  text-wrap:balance;
}
#page-reasons.reasons-ds-v1 .reasons-hero .reasons-time { color:var(--reasons-lilac); }
#page-reasons.reasons-ds-v1 .reasons-hero .reasons-result { color:#FF9974; }
#page-reasons.reasons-ds-v1 .reasons-hero .whole-optimization {
  display:block;
  margin-top:.28em;
  color:#fff;
}
#page-reasons.reasons-ds-v1 .reasons-hero .management-toc { color:#fff; }
#page-reasons.reasons-ds-v1 .reasons-hero .toc-inline { font-size:.56em; vertical-align:.12em; letter-spacing:0; }
#page-reasons.reasons-ds-v1 .reasons-hero .base-predicate {
  display:block;
  margin-top:.18em;
  color:rgba(255,255,255,.84);
  font-size:.78em;
  letter-spacing:-.02em;
}

/* Shared section heading grammar. */
#page-reasons.reasons-ds-v1 section.block { padding:clamp(76px,8vw,112px) 0; }
#page-reasons.reasons-ds-v1 .reasons-section-head { max-width:none; margin:0; text-align:left; }
#page-reasons.reasons-ds-v1 .reasons-section-head .eyebrow {
  display:flex;
  align-items:center;
  gap:10px;
  margin:0 0 15px;
  color:var(--reasons-muted);
  font-family:var(--ob-font-latin);
  font-size:12px;
  font-weight:500;
  letter-spacing:.14em;
}
#page-reasons.reasons-ds-v1 .reasons-section-head .eyebrow::before {
  content:"";
  width:var(--ob-shell-section-marker-width);
  height:var(--ob-shell-marker-height);
  margin:0;
  border-radius:2px;
  background:var(--reasons-coral);
}
#page-reasons.reasons-ds-v1 .reasons-section-head h2 {
  margin:0 0 16px;
  color:var(--reasons-navy);
  font-size:var(--ob-shell-section-title);
  font-weight:500;
  line-height:1.42;
  letter-spacing:-.02em;
  text-wrap:balance;
}
#page-reasons.reasons-ds-v1 .reasons-section-head p {
  max-width:42em;
  margin:0;
  color:var(--reasons-body);
  font-size:17px;
  line-height:1.85;
  text-wrap:pretty;
}

/* 02 / Primary proof: one shell, strong context plane + quiet evidence rows. */
#page-reasons.reasons-ds-v1 .reasons-theory { background:#fff; }
#page-reasons.reasons-ds-v1 .reasons-theory > .wrap {
  display:grid;
  grid-template-columns:minmax(300px,.82fr) minmax(0,1.58fr);
  width:min(calc(100% - 48px),1240px);
  max-width:1240px;
  overflow:hidden;
  border:1px solid #d8e0e7;
  border-radius:22px;
  background:#fff;
  box-shadow:0 18px 46px rgba(13,25,38,.06);
}
#page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head {
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:clamp(38px,4.2vw,58px);
  background-color:var(--reasons-lilac);
  background-image:var(--reasons-plum);
}
#page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head .eyebrow,
#page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head h2,
#page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head p { color:var(--reasons-ink); }
#page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head p { max-width:31em; }
#page-reasons.reasons-ds-v1 .theory-list {
  display:flex;
  flex-direction:column;
  min-width:0;
  border:0;
  background:#fff;
}
#page-reasons.reasons-ds-v1 .theory-item,
#page-reasons.reasons-ds-v1 .theory-item:nth-child(-n+3),
#page-reasons.reasons-ds-v1 .theory-item:nth-child(n+4) {
  display:grid;
  grid-template-columns:minmax(120px,165px) minmax(0,1fr);
  gap:24px;
  align-items:start;
  min-height:0;
  padding:24px 32px;
  border:0;
  border-bottom:1px solid #e1e7ec;
  background:#fff;
}
#page-reasons.reasons-ds-v1 .theory-item:last-child { border-bottom:0; }
#page-reasons.reasons-ds-v1 .theory-item::before { content:none; display:none; }
#page-reasons.reasons-ds-v1 .theory-item h3 {
  margin:0;
  color:var(--reasons-navy);
  font-family:var(--ob-font-latin);
  font-size:20px;
  font-weight:500;
  line-height:1.45;
}
#page-reasons.reasons-ds-v1 .theory-item p {
  margin:0;
  color:var(--reasons-body);
  font-size:15px;
  line-height:1.8;
  text-wrap:pretty;
}
@media (hover:hover) and (pointer:fine) {
  #page-reasons.reasons-ds-v1 .theory-item:hover { background:#f7f9fb; }
}

/* 03 / Primary narrative: expert support is a strong differentiator, with one peer grammar. */
#page-reasons.reasons-ds-v1 .reasons-expert {
  position:relative;
  isolation:isolate;
  overflow:hidden;
  background-color:var(--reasons-teal);
  background-image:var(--reasons-teal-lit);
}
#page-reasons.reasons-ds-v1 .reasons-expert::before {
  content:"";
  position:absolute;
  right:-70px;
  top:-90px;
  width:340px;
  height:340px;
  z-index:-1;
  pointer-events:none;
  background:radial-gradient(circle,rgba(255,255,255,.18) 1px,transparent 1.5px) 0 0/16px 16px;
  -webkit-mask-image:radial-gradient(circle,#000 10%,transparent 72%);
  mask-image:radial-gradient(circle,#000 10%,transparent 72%);
}
#page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head { width:min(100%,820px); margin-bottom:36px; }
#page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head .eyebrow,
#page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head h2,
#page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head p { color:#fff; }
#page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head .eyebrow { color:rgba(255,255,255,.76); }
#page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head .eyebrow::before { background:#FF9974; }
#page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head p { max-width:48em; color:rgba(255,255,255,.88); }
#page-reasons.reasons-ds-v1 .expert-list {
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:14px;
  border:0;
}
#page-reasons.reasons-ds-v1 .expert-item {
  position:relative;
  min-height:0;
  padding:30px 28px 32px;
  border:1px solid rgba(255,255,255,.5);
  border-radius:16px;
  background:rgba(255,255,255,.96);
  box-shadow:0 12px 30px rgba(13,25,38,.10);
}
#page-reasons.reasons-ds-v1 .expert-item:first-child,
#page-reasons.reasons-ds-v1 .expert-item:nth-child(2),
#page-reasons.reasons-ds-v1 .expert-item:last-child { background:rgba(255,255,255,.96); border-right:1px solid rgba(255,255,255,.5); }
#page-reasons.reasons-ds-v1 .expert-item::before {
  content:"";
  position:absolute;
  inset:0 0 auto;
  height:3px;
  border-radius:16px 16px 0 0;
  background:var(--reasons-rule);
}
#page-reasons.reasons-ds-v1 .expert-item h3 {
  margin:0 0 15px;
  color:var(--reasons-navy);
  font-size:21px;
  font-weight:500;
  line-height:1.45;
  text-wrap:balance;
}
#page-reasons.reasons-ds-v1 .expert-item p { margin:0; color:var(--reasons-body); font-size:15px; line-height:1.8; text-wrap:pretty; }

/* 04 / Explanatory media: reading context and diagram are composed, not stacked as unrelated cards. */
#page-reasons.reasons-ds-v1 .reasons-architecture { background:#f7f8fa; }
#page-reasons.reasons-ds-v1 .reasons-architecture > .wrap {
  display:grid;
  grid-template-columns:minmax(290px,.78fr) minmax(0,1.45fr);
  gap:clamp(36px,5vw,64px);
  align-items:center;
}
#page-reasons.reasons-ds-v1 .reasons-architecture .reasons-section-head { max-width:430px; }
#page-reasons.reasons-ds-v1 .reasons-architecture .reasons-section-head p { max-width:33em; }
#page-reasons.reasons-ds-v1 .architecture-visual {
  max-width:none;
  margin:0;
  padding:20px;
  overflow:hidden;
  border:3px solid transparent;
  border-radius:20px;
  background-color:#fff;
  background-image:linear-gradient(#fff,#fff),var(--reasons-rim);
  background-origin:padding-box,border-box;
  background-clip:padding-box,border-box;
  box-shadow:0 18px 48px rgba(13,25,38,.07);
  text-align:left;
}
#page-reasons.reasons-ds-v1 .architecture-system {
  width:100%;
  min-width:0;
}
#page-reasons.reasons-ds-v1 .architecture-system__title {
  margin:2px 2px 18px;
  color:var(--reasons-navy);
  font-size:clamp(20px,2vw,26px);
  font-weight:500;
  line-height:1.45;
  letter-spacing:-.02em;
  text-wrap:balance;
}
#page-reasons.reasons-ds-v1 .architecture-layer {
  display:grid;
  grid-template-columns:minmax(96px,112px) minmax(0,1fr) minmax(140px,170px);
  gap:16px;
  align-items:start;
  padding:18px 16px;
  border-top:1px solid #dce3e8;
}
#page-reasons.reasons-ds-v1 .architecture-layer:first-of-type {
  border-top:0;
}
#page-reasons.reasons-ds-v1 .architecture-layer--app { background:rgba(232,191,230,.22); }
#page-reasons.reasons-ds-v1 .architecture-layer--decision { background:rgba(253,96,74,.07); }
#page-reasons.reasons-ds-v1 .architecture-layer--data { background:rgba(31,108,109,.08); }
#page-reasons.reasons-ds-v1 .architecture-layer__label {
  margin:2px 0 0;
  color:var(--reasons-navy);
  font-size:14px;
  font-weight:600;
  line-height:1.45;
}
#page-reasons.reasons-ds-v1 .architecture-layer__content { min-width:0; }
#page-reasons.reasons-ds-v1 .architecture-chips {
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
#page-reasons.reasons-ds-v1 .architecture-chips + .architecture-chips { margin-top:9px; }
#page-reasons.reasons-ds-v1 .architecture-chips li {
  display:flex;
  align-items:center;
  min-height:34px;
  padding:7px 11px;
  border:1px solid rgba(26,49,75,.18);
  border-radius:999px;
  background:rgba(255,255,255,.76);
  color:var(--reasons-ink);
  font-size:12px;
  line-height:1.35;
}
#page-reasons.reasons-ds-v1 .architecture-chips--process li {
  border-style:dashed;
  background:rgba(255,255,255,.52);
}
#page-reasons.reasons-ds-v1 .architecture-layer__caption {
  margin:12px 0 0;
  color:var(--reasons-body);
  font-size:12px;
  line-height:1.7;
  text-wrap:pretty;
}
#page-reasons.reasons-ds-v1 .architecture-layer__side {
  margin:2px 0 0;
  color:var(--reasons-body);
  font-size:12px;
  line-height:1.7;
  text-wrap:pretty;
}
#page-reasons.reasons-ds-v1 .architecture-visual .diagram-caption {
  max-width:none;
  margin:18px 6px 4px;
  padding-top:16px;
  border-top:1px solid #e1e7ec;
  color:var(--reasons-body);
  font-size:14px;
  line-height:1.75;
  text-align:left;
  text-wrap:pretty;
}

/* 05 / Interaction: strong close, but one clear action only. */
#page-reasons.reasons-ds-v1 .reasons-cta { padding:clamp(68px,7vw,96px) 0; background:#fff; }
#page-reasons.reasons-ds-v1 .reasons-cta > .wrap { width:min(calc(100% - 48px),1120px); max-width:1120px; }
#page-reasons.reasons-ds-v1 .cta-band {
  position:relative;
  isolation:isolate;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  column-gap:40px;
  align-items:center;
  overflow:hidden;
  padding:clamp(36px,5vw,56px);
  border-radius:20px;
  background-color:#101e2f;
  background-image:var(--reasons-lit);
  box-shadow:0 18px 44px rgba(13,25,38,.10);
  text-align:left;
}
#page-reasons.reasons-ds-v1 .cta-band::before {
  content:"";
  position:absolute;
  right:-50px;
  bottom:-65px;
  width:220px;
  height:220px;
  z-index:-1;
  background:radial-gradient(circle,rgba(232,191,230,.20) 1px,transparent 1.5px) 0 0/15px 15px;
  -webkit-mask-image:linear-gradient(315deg,#000,transparent 78%);
  mask-image:linear-gradient(315deg,#000,transparent 78%);
}
#page-reasons.reasons-ds-v1 .cta-band h2 { grid-column:1; margin:0 0 9px; color:#fff; font-size:var(--ob-type-cta-title); font-weight:500; line-height:1.45; text-wrap:balance; }
#page-reasons.reasons-ds-v1 .cta-band p { grid-column:1; margin:0; color:rgba(255,255,255,.82); font-size:var(--ob-type-cta-body); line-height:1.75; }
#page-reasons.reasons-ds-v1 .cta-band .btn {
  grid-column:2;
  grid-row:1 / span 2;
  justify-self:end;
  min-height:48px;
  padding:13px 22px;
  font-size:var(--ob-type-cta-label);
  border:1px solid #cf633c;
  border-radius:8px;
  background-color:#FF9974;
  background-image:var(--reasons-warm);
  color:var(--reasons-ink);
  box-shadow:0 3px 8px rgba(0,0,0,.16);
}
#page-reasons.reasons-ds-v1 .cta-band .btn:hover { background-image:var(--reasons-warm); color:var(--reasons-ink); transform:none; }
#page-reasons.reasons-ds-v1 .cta-band .btn:focus-visible { outline:3px solid #fff; outline-offset:4px; }

@media(max-width:1080px) {
  #page-reasons.reasons-ds-v1 .reasons-architecture > .wrap { grid-template-columns:1fr; }
  #page-reasons.reasons-ds-v1 .reasons-architecture .reasons-section-head { max-width:800px; }
  #page-reasons.reasons-ds-v1 .architecture-visual { max-width:920px; }
}
@media(max-width:980px) {
  #page-reasons.reasons-ds-v1 .reasons-theory > .wrap { grid-template-columns:1fr; }
  #page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head { padding:34px 36px 32px; }
  #page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head p { max-width:46em; }
  #page-reasons.reasons-ds-v1 .expert-list { grid-template-columns:1fr; }
  #page-reasons.reasons-ds-v1 .expert-item { padding:26px 28px; }
}
@media(max-width:760px) {
  #page-reasons.reasons-ds-v1 .wrap { width:calc(100% - 32px); }
  #page-reasons.reasons-ds-v1 section.block { padding:68px 0; }
  #page-reasons.reasons-ds-v1 .reasons-hero { padding:var(--ob-shell-hero-pad-top) 0 var(--ob-shell-hero-pad-bottom); }
  #page-reasons.reasons-ds-v1 .reasons-hero h1 { width:auto; max-width:none; font-size:clamp(31px,8.2vw,38px); line-height:1.42; letter-spacing:-.025em; }
  #page-reasons.reasons-ds-v1 .reasons-hero .management-toc { white-space:normal; }
  #page-reasons.reasons-ds-v1 .reasons-hero .whole-optimization { margin-top:.34em; }
  #page-reasons.reasons-ds-v1 .reasons-hero .base-predicate { font-size:.82em; }
  #page-reasons.reasons-ds-v1 .reasons-section-head h2 { font-size:var(--ob-shell-section-title); }
  #page-reasons.reasons-ds-v1 .reasons-section-head p { font-size:15px; }
  #page-reasons.reasons-ds-v1 .reasons-theory > .wrap { width:calc(100% - 32px); border-radius:18px; }
  #page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head { padding:28px 24px 26px; }
  #page-reasons.reasons-ds-v1 .theory-item,
  #page-reasons.reasons-ds-v1 .theory-item:nth-child(-n+3),
  #page-reasons.reasons-ds-v1 .theory-item:nth-child(n+4) { grid-template-columns:1fr; gap:8px; padding:22px 24px 24px; }
  #page-reasons.reasons-ds-v1 .theory-item h3 { font-size:20px; }
  #page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head { margin-bottom:28px; }
  #page-reasons.reasons-ds-v1 .expert-item { padding:24px; }
  #page-reasons.reasons-ds-v1 .expert-item h3 { font-size:20px; }
  #page-reasons.reasons-ds-v1 .architecture-visual { padding:14px; border-radius:18px; }
  #page-reasons.reasons-ds-v1 .architecture-layer {
    grid-template-columns:1fr;
    gap:10px;
    padding:18px 14px;
  }
  #page-reasons.reasons-ds-v1 .architecture-layer__label br { display:none; }
  #page-reasons.reasons-ds-v1 .architecture-layer__side {
    padding-top:10px;
    border-top:1px solid rgba(26,49,75,.14);
  }
  #page-reasons.reasons-ds-v1 .architecture-chips li {
    flex:1 1 118px;
    justify-content:center;
    text-align:center;
  }
  #page-reasons.reasons-ds-v1 .architecture-visual .diagram-caption { margin:15px 4px 2px; padding-top:14px; font-size:13px; }
  #page-reasons.reasons-ds-v1 .reasons-cta { padding:60px 0 76px; }
  #page-reasons.reasons-ds-v1 .reasons-cta > .wrap { width:calc(100% - 32px); }
  #page-reasons.reasons-ds-v1 .cta-band { grid-template-columns:1fr; gap:0; padding:30px 24px; border-radius:18px; }
  #page-reasons.reasons-ds-v1 .cta-band h2,
  #page-reasons.reasons-ds-v1 .cta-band p,
  #page-reasons.reasons-ds-v1 .cta-band .btn { grid-column:1; }
  #page-reasons.reasons-ds-v1 .cta-band .btn { grid-row:auto; justify-self:start; margin-top:22px; }
}
@media(max-width:360px) {
  #page-reasons.reasons-ds-v1 .reasons-hero .wrap { padding-inline:0; }
  #page-reasons.reasons-ds-v1 .reasons-hero h1 { width:auto; font-size:30px; }
  #page-reasons.reasons-ds-v1 .reasons-section-head h2 { font-size:var(--ob-shell-section-title); }
  #page-reasons.reasons-ds-v1 .reasons-architecture .reasons-section-head h2 { font-size:24px; }
}
@media(prefers-reduced-motion:reduce) {
  #page-reasons.reasons-ds-v1 * { scroll-behavior:auto; }
}
@media(forced-colors:active) {
  #page-reasons.reasons-ds-v1 .reasons-hero::before,
  #page-reasons.reasons-ds-v1 .reasons-hero::after,
  #page-reasons.reasons-ds-v1 .reasons-expert::before,
  #page-reasons.reasons-ds-v1 .cta-band::before { display:none; }
  #page-reasons.reasons-ds-v1 .reasons-hero,
  #page-reasons.reasons-ds-v1 .reasons-theory .reasons-section-head,
  #page-reasons.reasons-ds-v1 .reasons-expert,
  #page-reasons.reasons-ds-v1 .expert-item,
  #page-reasons.reasons-ds-v1 .architecture-visual,
  #page-reasons.reasons-ds-v1 .cta-band { background:Canvas; color:CanvasText; box-shadow:none; border:1px solid CanvasText; }
  #page-reasons.reasons-ds-v1 .reasons-hero h1,
  #page-reasons.reasons-ds-v1 .reasons-hero .reasons-time,
  #page-reasons.reasons-ds-v1 .reasons-hero .reasons-result,
  #page-reasons.reasons-ds-v1 .reasons-hero .base-predicate,
  #page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head h2,
  #page-reasons.reasons-ds-v1 .reasons-expert .reasons-section-head p { color:CanvasText; }
  #page-reasons.reasons-ds-v1 .cta-band .btn { background:ButtonFace; color:ButtonText; border:2px solid ButtonText; }
}