/* contribution card */
.ob-dparts { display: flex; flex-wrap: wrap; gap: 8px 28px; margin: 18px 0 0; }
.ob-dparts a { display: inline-flex; gap: 10px; font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .12em; color: var(--t-white, #f4f1ea); padding-bottom: 4px; border-bottom: 1px solid var(--t-hair2, #34302b); transition: border-color .15s, color .15s; }
.ob-dparts a span { color: var(--t-org, #fa680c); } .ob-dparts a:hover { border-color: var(--t-org, #fa680c); }

/* transition */
.ob-bx { padding: clamp(88px, 11vw, 160px) 0; border-top: 1px solid var(--t-hair, #24211e); background: radial-gradient(ellipse 60% 80% at 20% 50%, rgba(250,104,12,.06), transparent 70%); }
.ob-bx__t { margin: 0; font-family: var(--font-heading, serif); font-size-adjust: var(--fsa-heading); font-size: clamp(40px, 6.4vw, 92px); line-height: 1; letter-spacing: -.02em; color: #fff; max-width: 16ch; }
.ob-bx__l { margin: 18px 0 32px; font-family: var(--font-body-alt, monospace); font-size: clamp(16px, 1.5vw, 20px); color: var(--t-body, #cecdc9); }
.ob-bx__go { display: inline-flex; align-items: center; gap: 12px; padding: 14px 20px; background: var(--t-org, #fa680c); color: #0a0a0a; font-family: var(--ob-font); font-size: var(--type-body-s); letter-spacing: .14em; }
.ob-bx__go i { font-style: normal; transition: transform .2s steps(3); } .ob-bx__go:hover i { transform: translateY(3px); }

.ob-bsec { padding-block: var(--space-major); border-top: 1px solid var(--t-hair, #24211e); scroll-margin-top: var(--anchor-offset); }
.ob-bsec--tight { padding-block: clamp(48px, 6vw, 80px); }
.ob-bsec .ob-h2 { max-width: 22ch; }
.ob-bsec :is(a, summary):focus-visible, .ob-dparts a:focus-visible, .ob-bx__go:focus-visible { outline: 2px solid var(--t-org, #fa680c); outline-offset: 3px; }

/* the model line */
.ob-bmodel { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 12px; margin: clamp(36px, 5vw, 56px) 0 14px; padding: 18px 0; border-block: 1px solid var(--t-hair, #24211e);
  font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .12em; color: var(--t-mute, #9f9b92); }
.ob-bmodel i { font-style: normal; color: var(--t-faint, #8d8981); } .ob-bmodel b { font-weight: 400; color: var(--t-org, #fa680c); }

/* contribution track + steps */
.ob-btrack { list-style: none; margin: clamp(36px, 5vw, 56px) 0 0; padding: 0; display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); position: relative; }
.ob-btrack::before { content: ""; position: absolute; left: 0; right: 0; top: 4px; height: 1px; background: var(--t-hair2, #34302b); }
.ob-btrack li { position: relative; display: grid; gap: 6px; padding: 22px 10px 0 0; }
.ob-btrack li::before { content: ""; position: absolute; left: 0; top: 0; width: 9px; height: 9px; background: #0a0a0a; box-shadow: inset 0 0 0 1px var(--t-mute, #9f9b92); }
.ob-btrack li.is-key::before { background: var(--t-white, #f4f1ea); box-shadow: none; } .ob-btrack li:last-child::before { background: var(--t-org, #fa680c); box-shadow: none; }
.ob-btrack span { font-family: var(--ob-font); font-size: var(--type-label); color: var(--t-faint, #8d8981); }
.ob-btrack b { font-family: var(--ob-font); font-weight: 400; font-size: var(--type-label); letter-spacing: .1em; color: var(--t-white, #f4f1ea); overflow-wrap: anywhere; }
.ob-btrack li:last-child b { color: var(--t-org, #fa680c); }
@media (max-width: 900px) {
  .ob-btrack { grid-template-columns: 1fr; border-left: 1px solid var(--t-hair2, #34302b); margin-left: 4px; }
  .ob-btrack::before { display: none; } .ob-btrack li { grid-template-columns: 28px 1fr; padding: 0 0 14px 20px; } .ob-btrack li::before { left: -5px; top: 3px; }
}
.ob-bsteps { list-style: none; margin: clamp(48px, 6vw, 72px) 0 0; padding: 0; display: grid; gap: 0 40px; }
@media (min-width: 800px) { .ob-bsteps { grid-template-columns: 1fr 1fr; } }
.ob-bsteps li { display: grid; grid-template-columns: 36px minmax(0, 1fr); gap: 4px 12px; padding: 16px 0; border-top: 1px solid var(--t-hair, #24211e); }
.ob-bsteps .n { grid-row: span 2; font-family: var(--ob-font); font-size: var(--type-label); color: var(--t-org, #fa680c); padding-top: 2px; }
.ob-bsteps b { font-family: var(--ob-font); font-weight: 400; font-size: var(--type-body-s); letter-spacing: .12em; color: var(--t-white, #f4f1ea); }
.ob-bsteps p { margin: 0; font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); line-height: 1.5; color: var(--t-mute, #9f9b92); }
.ob-bprin { margin: clamp(56px, 7vw, 88px) 0 0; font-family: var(--font-heading, serif); font-size-adjust: var(--fsa-heading); font-size: clamp(30px, 4vw, 54px); line-height: 1.04; letter-spacing: -.015em; color: #fff; }
.ob-bprin em { font-style: normal; color: var(--t-org, #fa680c); }

/* areas */
.ob-bareas { list-style: none; margin: clamp(36px, 5vw, 56px) 0 0; padding: 0; display: grid; gap: 32px 40px; }
@media (min-width: 640px) { .ob-bareas { grid-template-columns: 1fr 1fr; } } @media (min-width: 1100px) { .ob-bareas { grid-template-columns: repeat(3, 1fr); } }
.ob-bareas li { padding-top: 16px; border-top: 1px solid var(--t-hair2, #34302b); }
.ob-bareas h3 { margin: 0 0 8px; font-family: var(--ob-font); font-weight: 400; font-size: var(--type-body-s); letter-spacing: .14em; color: var(--t-white, #f4f1ea); }
.ob-bareas p { margin: 0; font-family: var(--font-body-alt, monospace); font-size: 15px; line-height: 1.55; color: var(--t-mute, #9f9b92); }

/* example capsule: the only panel — it is an object */
.ob-bcapw { display: grid; gap: 40px; margin-top: clamp(36px, 5vw, 56px); align-items: start; }
@media (min-width: 1000px) { .ob-bcapw { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(40px, 5vw, 80px); } }
.ob-bcap { position: relative; padding: clamp(22px, 3vw, 32px); background: #0e0d0c; border: 1px solid var(--t-hair2, #34302b); }
.ob-bcap::before { content: ""; position: absolute; left: -1px; top: -1px; width: 64px; height: 2px; background: var(--t-org, #fa680c); }
.ob-bcap__hd { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .14em; color: var(--t-mute, #9f9b92); }
.ob-bcap__hd i { font-style: normal; color: var(--t-faint, #8d8981); } .ob-bcap__hd em { font-style: normal; color: var(--ob-amber, #f0b46a); }
.ob-bcap__t { margin: 14px 0 20px; font-family: var(--font-heading, serif); font-size-adjust: var(--fsa-heading); font-weight: 400; font-size: clamp(28px, 3vw, 40px); line-height: 1.05; color: #fff; }
.ob-bcap__s, .ob-bcap__full { margin: 0; display: grid; gap: 0; }
.ob-bcap__s > div, .ob-bcap__full > div { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 4px 16px; padding: 10px 0; border-top: 1px solid var(--t-hair, #24211e); }
.ob-bcap dt { font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .14em; color: var(--t-faint, #8d8981); padding-top: 3px; }
.ob-bcap dd { margin: 0; font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); line-height: 1.5; color: var(--t-body, #cecdc9); }
@media (max-width: 560px) { .ob-bcap__s > div, .ob-bcap__full > div { grid-template-columns: 1fr; } }
.ob-bcap__k { margin: 20px 0 8px; font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .14em; color: var(--t-faint, #8d8981); }
.ob-bcap__succ { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.ob-bcap__succ li { position: relative; padding-left: 20px; font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); line-height: 1.5; color: var(--t-white, #f4f1ea); }
.ob-bcap__succ li::before { content: ""; position: absolute; left: 0; top: .55em; width: 7px; height: 7px; box-shadow: inset 0 0 0 1px var(--t-org, #fa680c); }
.ob-bmeta .ob-bcap__k:first-child { margin-top: 0; }
.ob-bmeta dl { margin: 0; display: grid; gap: 0; }
.ob-bmeta dl > div { padding: 12px 0; border-top: 1px solid var(--t-hair, #24211e); display: grid; gap: 8px; }
.ob-bmeta dt { font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .14em; color: var(--t-white, #f4f1ea); }
.ob-bmeta dd { margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.ob-bmeta dd span { padding: 4px 7px; border: 1px solid var(--t-hair2, #34302b); font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .1em; color: var(--t-mute, #9f9b92); }

/* open work */
.ob-bopen { display: grid; gap: 24px; align-items: end; }
@media (min-width: 900px) { .ob-bopen { grid-template-columns: minmax(0, 1fr) auto; } }
.ob-bopen__st { margin-left: 12px; }
.ob-bopen__t { margin: 0; font-family: var(--font-heading, serif); font-size-adjust: var(--fsa-heading); font-weight: 400; font-size: clamp(26px, 3vw, 40px); line-height: 1.08; color: #fff; max-width: 24ch; }

/* principles */
.ob-bprins { list-style: none; margin: clamp(40px, 5vw, 64px) 0 0; padding: 0; display: grid; gap: 32px 40px; }
@media (min-width: 720px) { .ob-bprins { grid-template-columns: 1fr 1fr; } } @media (min-width: 1100px) { .ob-bprins { grid-template-columns: repeat(3, 1fr); } }
.ob-bprins li { padding-top: 16px; border-top: 1px solid var(--t-hair2, #34302b); }
.ob-bprins h3 { margin: 0 0 8px; font-family: var(--ob-font); font-weight: 400; font-size: var(--type-label); letter-spacing: .14em; color: var(--t-white, #f4f1ea); }
.ob-bprins p { margin: 0; font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); line-height: 1.55; color: var(--t-mute, #9f9b92); }
.ob-bflows { display: grid; gap: 32px 48px; margin-top: clamp(48px, 6vw, 72px); }
@media (min-width: 900px) { .ob-bflows { grid-template-columns: 1fr 1fr; } }
.ob-bflows__l { margin: 0; font-family: var(--ob-font); font-size: var(--type-label); line-height: 2; letter-spacing: .1em; color: var(--t-body, #cecdc9); }

/* introduce yourself */
.ob-bjoin { background: radial-gradient(ellipse 70% 90% at 80% 30%, rgba(250,104,12,.05), transparent 70%); }
.ob-bask { list-style: none; margin: 28px 0 32px; padding: 0; display: flex; flex-wrap: wrap; gap: 10px 28px; }
.ob-bask b { font-family: var(--ob-font); font-weight: 400; font-size: var(--type-label); letter-spacing: .14em; color: var(--t-white, #f4f1ea); }
.ob-bask span { font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); color: var(--t-faint, #8d8981); }

/* legal note */
.ob-blegal { max-width: var(--site-max-width); }   /* same left edge as every section; paragraphs carry the measure */
.ob-blegal p:not(.ob-tlab) { margin: 0 0 12px; max-width: 72ch; font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); line-height: 1.6; color: var(--t-mute, #9f9b92); }
.ob-blegal b { font-weight: 400; color: var(--t-white, #f4f1ea); }
@media (min-width: 901px) and (max-width: 1280px) { .ob-btrack b { font-size: var(--type-label); letter-spacing: .04em; overflow-wrap: normal; } }

/* ══ system / problems / journey (technical without code) ══ */
.ob-dtop { padding-bottom: 8px; }
.ob-dstatus { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin: 0; padding: 14px 0; border-block: 1px solid var(--t-hair, #24211e); }
.ob-dstatus span:not(.ob-stat) { font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); color: var(--t-mute, #9f9b92); }
.ob-dparts { margin-top: 16px; }

/* 02 system diagram: one track, grouped by who does the work */
.ob-dsys { margin-top: clamp(40px, 5vw, 64px); }
.ob-dsys__groups { display: grid; grid-template-columns: 1fr 5fr 4fr 1fr; gap: 0 10px; margin-bottom: 14px; font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .14em; color: var(--t-faint, #8d8981); }
.ob-dsys__groups span { padding-bottom: 8px; border-bottom: 1px solid var(--t-hair2, #34302b); }
.ob-dsys__groups .g-form { grid-column: 2; } .ob-dsys__groups .g-ntu { grid-column: 3; color: var(--t-org, #fa680c); border-color: rgba(250,104,12,.5); } .ob-dsys__groups .g-verify { grid-column: 4; }
.ob-dsys__track { position: relative; list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(11, minmax(0, 1fr)); gap: 0 10px; }
.ob-dsys__track::before { content: ""; position: absolute; left: 0; right: 0; top: 4px; height: 1px; background: var(--t-hair2, #34302b); }
.ob-dsys__track li { position: relative; display: grid; gap: 6px; align-content: start; padding-top: 22px; }
.ob-dsys__track li::before { content: ""; position: absolute; left: 0; top: 0; width: 9px; height: 9px; background: #0a0a0a; box-shadow: inset 0 0 0 1px var(--t-mute, #9f9b92); }
.ob-dsys__track li.is-key::before { background: var(--t-white, #f4f1ea); box-shadow: none; } .ob-dsys__track li.g-ntu.is-key::before { background: var(--t-org, #fa680c); }
.ob-dsys__track b { font-family: var(--ob-font); font-weight: 400; font-size: var(--type-label); letter-spacing: .08em; color: var(--t-white, #f4f1ea); }
.ob-dsys__track span { font-family: var(--font-body-alt, monospace); font-size: var(--type-label); line-height: 1.35; color: var(--t-faint, #8d8981); }
@media (max-width: 1100px) and (min-width: 761px) { .ob-dsys__track b { font-size: var(--type-label); letter-spacing: .03em; } .ob-dsys__track span { font-size: var(--type-label); } }
@media (max-width: 760px) {
  .ob-dsys__groups { display: none; }
  .ob-dsys__track { grid-template-columns: 1fr; border-left: 1px solid var(--t-hair2, #34302b); margin-left: 4px; }
  .ob-dsys__track::before { display: none; }
  .ob-dsys__track li { grid-template-columns: 130px 1fr; align-items: baseline; padding: 0 0 16px 20px; } .ob-dsys__track li::before { left: -5px; top: 3px; }
  .ob-dsys__track li.g-form:nth-child(2)::after, .ob-dsys__track li.g-ntu:nth-child(7)::after, .ob-dsys__track li.g-verify::after { position: absolute; left: 20px; top: -18px; font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .14em; color: var(--t-faint, #8d8981); }
  .ob-dsys__track li.g-form:nth-child(2) { margin-top: 18px; } .ob-dsys__track li.g-form:nth-child(2)::after { content: "ORBI · FORMS THE WORK"; }
  .ob-dsys__track li.g-ntu:nth-child(7) { margin-top: 18px; } .ob-dsys__track li.g-ntu:nth-child(7)::after { content: "NTU · EXECUTES IT"; color: var(--t-org, #fa680c); }
  .ob-dsys__track li.g-verify { margin-top: 18px; } .ob-dsys__track li.g-verify::after { content: "ORBI · VERIFIES"; }
}
.ob-dpair { display: grid; gap: 48px; margin-top: clamp(56px, 7vw, 88px); }
@media (min-width: 960px) { .ob-dpair { grid-template-columns: 1fr 1fr; gap: clamp(48px, 6vw, 96px); } }
.ob-dpair > div { padding-top: 18px; border-top: 1px solid var(--t-hair2, #34302b); }
.ob-dpair__k { margin: 0 0 12px; font-family: var(--ob-font); font-size: var(--type-body-s); letter-spacing: .16em; color: var(--t-org, #fa680c); }
.ob-dpair__lead { margin: 0; max-width: 34ch; font-family: var(--font-heading, serif); font-size-adjust: var(--fsa-heading); font-size: clamp(22px, 2.1vw, 28px); line-height: 1.18; color: #fff; }
.ob-dpair .ob-tbody { margin-top: 14px; }
.ob-dchips { list-style: none; margin: 20px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.ob-dchips li { padding: 5px 8px; border: 1px solid var(--t-hair2, #34302b); font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .1em; color: var(--t-body, #cecdc9); }
.ob-dnote { margin: 18px 0 0; max-width: 58ch; font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); line-height: 1.55; color: var(--t-faint, #8d8981); }
.ob-dchain { list-style: none; margin: 22px 0 0; padding: 0; position: relative; }
.ob-dchain::before { content: ""; position: absolute; left: 4px; top: 8px; bottom: 8px; width: 1px; background: var(--t-hair2, #34302b); }
.ob-dchain li { position: relative; display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 14px; padding: 0 0 16px 26px; }
.ob-dchain li:last-child { padding-bottom: 0; }
.ob-dchain li::before { content: ""; position: absolute; left: 0; top: 4px; width: 9px; height: 9px; background: #0a0a0a; box-shadow: inset 0 0 0 1px var(--t-mute, #9f9b92); }
.ob-dchain li.is-orbi::before { background: var(--t-white, #f4f1ea); box-shadow: none; } .ob-dchain li.is-cap::before { background: var(--t-org, #fa680c); box-shadow: none; }
.ob-dchain b { font-family: var(--ob-font); font-weight: 400; font-size: var(--type-label); letter-spacing: .12em; color: var(--t-white, #f4f1ea); }
.ob-dchain span { font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); color: var(--t-faint, #8d8981); }

/* 03 hard problems: large numbered editorial rows */
.ob-dprob { list-style: none; margin: clamp(40px, 5vw, 64px) 0 0; padding: 0; border-bottom: 1px solid var(--t-hair, #24211e); }
.ob-dprob li { display: grid; grid-template-columns: 1fr; gap: 10px 32px; padding: clamp(22px, 3vw, 32px) 0; border-top: 1px solid var(--t-hair, #24211e); }
@media (min-width: 900px) { .ob-dprob li { grid-template-columns: 96px minmax(0, 4fr) minmax(0, 6fr); align-items: baseline; } }
.ob-dprob__n { font-family: var(--font-heading, serif); font-size-adjust: var(--fsa-heading); font-size: clamp(34px, 4vw, 56px); line-height: 1; color: var(--t-faint, #8d8981); }
.ob-dprob__h h3 { margin: 0; font-family: var(--font-heading, serif); font-size-adjust: var(--fsa-heading); font-weight: 400; font-size: clamp(24px, 2.4vw, 32px); line-height: 1.1; color: #fff; text-transform: capitalize; }
.ob-dprob__h em { display: block; margin-top: 8px; font-style: normal; font-family: var(--ob-font); font-size: var(--type-label); letter-spacing: .14em; color: var(--t-org, #fa680c); }
.ob-dprob p { margin: 0; max-width: 56ch; font-family: var(--font-body-alt, monospace); font-size: clamp(15px, 1.2vw, 17px); line-height: 1.6; color: var(--t-body, #cecdc9); }

/* 04 journey + capsule */
.ob-dflow { display: grid; gap: 48px; margin-top: clamp(40px, 5vw, 64px); align-items: start; }
@media (min-width: 1000px) { .ob-dflow { grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(48px, 6vw, 96px); } }
.ob-djour { list-style: none; margin: 0; padding: 0; position: relative; }
.ob-djour::before { content: ""; position: absolute; left: 4px; top: 8px; bottom: 8px; width: 1px; background: var(--t-hair2, #34302b); }
.ob-djour li { position: relative; display: grid; gap: 4px; padding: 0 0 20px 28px; }
.ob-djour li:last-child { padding-bottom: 0; }
.ob-djour li::before { content: ""; position: absolute; left: 0; top: 4px; width: 9px; height: 9px; background: #0a0a0a; box-shadow: inset 0 0 0 1px var(--t-mute, #9f9b92); }
.ob-djour li.is-key::before { background: var(--t-white, #f4f1ea); box-shadow: none; } .ob-djour li:last-child::before { background: var(--t-org, #fa680c); box-shadow: none; }
.ob-djour b { font-family: var(--ob-font); font-weight: 400; font-size: var(--type-label); letter-spacing: .12em; color: var(--t-white, #f4f1ea); }
.ob-djour span { font-family: var(--font-body-alt, monospace); font-size: var(--type-body-s); line-height: 1.45; color: var(--t-mute, #9f9b92); }
.ob-djour li:first-child span { color: #fff; font-size: 16px; }
.ob-dcap { position: sticky; top: 110px; }
@media (max-width: 999px) { .ob-dcap { position: static; } }

/* 05 what needs building */
.ob-dneed__h { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.ob-dneed .ob-dneed__h h3 { margin: 0; }

/* 06 build with ORBINTU */
.ob-dbuild__t { max-width: 20ch; font-size: clamp(36px, 5.2vw, 76px); margin: 0 0 18px; }
@media (min-width: 901px) { .ob-btrack--7 { grid-template-columns: repeat(7, minmax(0, 1fr)); } }
.ob-bopen2 { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--t-hair, #24211e); }
.ob-bopen2 .ob-bcap__k { display: flex; align-items: center; gap: 12px; margin-top: 0; }
.ob-blegal .ob-tlab, .ob-bopen2 .ob-bcap__k { flex-wrap: wrap; } .ob-blegal .ob-stat, .ob-bopen2 .ob-stat, .ob-dstatus .ob-stat { white-space: normal; line-height: 1.3; }