.home-hero{position:relative;overflow:hidden;min-height:calc(100vh - var(--site-header-height) - 36px);display:flex;align-items:center}.home-hero::after{content:"";position:absolute;inset:0 0 0 62%;opacity:.32;background-image:linear-gradient(rgba(63,184,175,.16) 1px,transparent 1px),linear-gradient(90deg,rgba(63,184,175,.16) 1px,transparent 1px);background-size:34px 34px;mask-image:linear-gradient(90deg,transparent,#000)}.home-hero .band-inner{position:relative;z-index:1}.home-hero h1{max-width:1120px;font-size:var(--font-home-h1);line-height:1.14}.home-hero h1 span{color:var(--amber)}
#why-past{scroll-margin-top:calc(var(--site-header-height) + 16px)}.hero-copy{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr);gap:clamp(28px,5vw,64px);align-items:start}.hero-copy>p:last-child{max-width:55ch;margin:0;border-left:2px solid var(--teal);padding-left:20px;color:#c2c8d4}.prose-stack p{margin:0 0 18px}.prose-stack p:last-child{margin-bottom:0}
.section-heading{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(0,1.2fr);gap:clamp(32px,6vw,92px);align-items:start}
.model-learning-diagram{display:grid;grid-template-columns:minmax(145px,.7fr) 32px minmax(460px,2.6fr) minmax(150px,.75fr) minmax(160px,.8fr);gap:16px;align-items:center;margin:40px 0 0}.diagram-entry,.diagram-gate,.diagram-future{display:flex;min-height:170px;flex-direction:column;justify-content:center;padding:20px;border:1px solid var(--line);background:rgba(11,22,38,.72)}.diagram-entry{border-left:4px solid var(--teal)}.diagram-gate{border-color:var(--amber);border-left-width:4px}.diagram-future{border-left:4px solid var(--amber)}.diagram-entry small,.diagram-gate small,.diagram-future small{margin-bottom:16px;color:var(--muted);font-size:10px;font-weight:800}.diagram-entry b,.diagram-gate b,.diagram-future b{font-size:15px}.diagram-entry span,.diagram-gate span,.diagram-future span{margin-top:8px;color:var(--muted);font-size:12px}.diagram-entry strong{margin-top:14px;color:var(--teal);font:700 13px/1.2 "SFMono-Regular",Consolas,monospace}.diagram-entry-arrow{color:var(--teal);font-size:24px;text-align:center}.learning-loop{position:relative;padding:24px 50px 52px;border:2px solid var(--teal);border-radius:50%;background:rgba(7,14,26,.48)}.learning-loop::before{content:"";position:absolute;right:8%;bottom:-6px;width:15px;height:15px;border-right:3px solid var(--teal);border-bottom:3px solid var(--teal);transform:rotate(-28deg)}.learning-loop ol{display:grid;grid-template-columns:repeat(5,minmax(90px,1fr));gap:8px;margin:0;padding:0;list-style:none}.learning-loop li{position:relative;min-height:104px;padding:14px 12px;border:1px solid var(--line);background:var(--ink)}.learning-loop li:not(:last-child)::after{content:"→";position:absolute;z-index:2;right:-12px;top:42px;width:16px;color:var(--amber);background:var(--ink);text-align:center}.learning-loop b{display:block;font-size:12px}.learning-loop span{display:block;margin-top:9px;color:var(--muted);font-size:11px}.loop-return{position:absolute;right:42px;bottom:12px;color:var(--teal);font-size:24px}.model-learning-diagram figcaption{grid-column:1/-1;max-width:86ch;margin-top:8px;color:var(--muted);font-size:13px}
.achievement-grid{display:grid;grid-template-columns:repeat(5,1fr);margin:34px 0 0;padding:0;list-style:none;border-top:1px solid var(--line);border-left:1px solid var(--line)}.achievement-grid li{padding:20px 16px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.achievement-grid b,.achievement-grid span{display:block}.achievement-grid b{font-size:14px}.achievement-grid span{margin-top:10px;color:var(--muted);font-size:12px}
.roadmap-split{display:grid;grid-template-columns:.7fr 1.3fr;gap:24px;margin-top:32px}.roadmap-split section{padding:24px;border-top:3px solid var(--teal);background:#0b1626}.roadmap-split section:last-child{border-top-color:var(--amber)}.roadmap-split h3{margin:0 0 18px}.roadmap-split ul{display:flex;flex-wrap:wrap;gap:10px;margin:0;padding:0;list-style:none}.roadmap-split li{padding:9px 12px;border:1px solid var(--line);font-size:13px}
.civilization-flow{display:grid;grid-template-columns:repeat(5,1fr);margin-top:34px}.civilization-flow>*{position:relative;min-height:76px;padding:18px 16px;border:1px solid var(--line);border-right:0;font-size:13px}.civilization-flow>*:last-child{border-right:1px solid var(--line)}.civilization-flow>*:not(:last-child)::after{content:"→";position:absolute;right:-10px;top:28px;z-index:2;width:20px;color:var(--teal);background:var(--ink);text-align:center}.civilization-flow b{color:var(--teal)}
.value-sequence{display:grid;grid-template-columns:repeat(4,1fr);margin-top:30px;border-top:1px solid var(--line);border-left:1px solid var(--line)}.value-sequence article{padding:22px 20px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.value-sequence article>b{color:var(--amber);font-size:14px}.value-sequence p{margin:12px 0 0;color:var(--muted);font-size:14px}.limit-copy{display:grid;gap:18px}.limit-copy p{margin:0;padding:0 0 18px;border-bottom:1px solid var(--line);color:#c8cdd8}
@media(max-width:1180px){.model-learning-diagram{grid-template-columns:160px 28px 1fr}.diagram-gate,.diagram-future{min-height:auto}.diagram-gate{grid-column:3}.diagram-future{grid-column:3}.learning-loop ol{grid-template-columns:repeat(3,1fr)}.learning-loop li:not(:last-child)::after{display:none}.achievement-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:900px){#why-past{scroll-margin-top:124px}.home-hero{min-height:720px}.hero-copy,.section-heading{grid-template-columns:1fr;gap:24px}.home-hero::after{inset:48% 0 0}.roadmap-split{grid-template-columns:1fr}.value-sequence{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){.model-learning-diagram{grid-template-columns:1fr;gap:12px}.diagram-entry-arrow{transform:rotate(90deg)}.learning-loop,.diagram-gate,.diagram-future{grid-column:1}.learning-loop{border-radius:28px;padding:26px 42px}.learning-loop ol{grid-template-columns:1fr}.learning-loop li{min-height:auto}.learning-loop li:not(:last-child)::after{display:block;content:"↓";right:20px;top:auto;bottom:-13px}.loop-return{right:14px;bottom:12px}.achievement-grid{grid-template-columns:1fr 1fr}.civilization-flow{grid-template-columns:1fr}.civilization-flow>*{border-right:1px solid var(--line);border-bottom:0}.civilization-flow>*:last-child{border-bottom:1px solid var(--line)}.civilization-flow>*:not(:last-child)::after{content:"↓";right:20px;top:auto;bottom:-11px}.value-sequence{grid-template-columns:1fr}}
@media(max-width:560px){.home-hero{min-height:auto}.home-hero h1 br{display:none}.achievement-grid{grid-template-columns:1fr}.diagram-entry,.diagram-gate,.diagram-future{min-height:auto}}
@media(prefers-reduced-motion:reduce){.model-learning-diagram *{animation:none!important;transition:none!important}}