.proposal .top nav a{color:var(--muted)}.proposal .top nav a[aria-current]{color:var(--accent)}.skip{position:absolute;left:12px;top:-60px;background:var(--panel);padding:12px;z-index:10}.skip:focus{top:12px}.hero{display:grid;grid-template-columns:1.35fr 1fr;gap:54px;align-items:center;padding:78px 0 42px}.hero h1{font-size:clamp(36px,4.5vw,58px);letter-spacing:-2px;line-height:1.08}.hero h1 span{color:var(--accent)}.lede{max-width:590px;color:var(--muted);font-size:17px;line-height:1.75;margin:24px 0}.lede strong{color:var(--text);font-weight:550}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.primary,.proposal .outline{display:inline-flex;align-items:center;justify-content:center;border-radius:7px;padding:12px 18px;font-size:13px;font-weight:650}.primary{background:var(--accent);color:#111c2e}.primary:hover{text-decoration:none;background:#ff8052}.hero-art{padding:35px 26px;border:1px solid var(--line);border-radius:18px;background:radial-gradient(ellipse at top,#ff642d13,transparent 70%),var(--panel);position:relative}.art-label{color:var(--muted);font-size:10px;letter-spacing:2px;text-align:center}.payment-cloud{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:24px auto 0;max-width:285px}.payment-cloud span{display:grid;place-items:center;border:1px solid var(--line);background:var(--raised);border-radius:9px;color:var(--accent);height:43px;font-size:25px}.payment-cloud span:nth-child(2),.payment-cloud span:nth-child(5){transform:translateY(-7px)}.stem{height:38px;width:1px;background:var(--accent);margin:auto}.anchor-block{border:1px solid var(--accent);border-radius:9px;display:flex;align-items:center;gap:16px;padding:18px;background:var(--soft)}.anchor-symbol{font-size:37px;color:var(--accent)}.anchor-block strong,.anchor-block small{display:block}.anchor-block small{font-size:11px;color:var(--muted);margin-top:4px}.hero-art>p{font-size:11px;color:var(--muted);text-align:center;margin-bottom:0}.research-note{font-size:12px;color:var(--muted);padding:17px 20px;border-left:3px solid var(--accent);background:var(--panel);border-radius:0 7px 7px 0}.research-note strong{color:var(--text)}.chapter{padding-top:72px;scroll-margin-top:25px}.section-heading{max-width:770px;margin-bottom:27px}.section-heading h2{font-size:clamp(24px,3vw,34px);letter-spacing:-1px}.section-heading>p:last-child{color:var(--muted);line-height:1.75;margin:15px 0 0}.opcode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.opcode-card{position:relative;padding:26px;border:1px solid var(--line);border-radius:11px;background:var(--panel);display:flex;flex-direction:column}.opcode-card.featured{border-color:var(--accent)}.step-number{position:absolute;right:22px;top:22px;font-size:11px;letter-spacing:2px;color:var(--muted)}.line-icon{font-size:33px;color:var(--accent);height:54px}.opcode-card h3{font:700 15px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;overflow-wrap:anywhere}.opcode-card p{color:var(--muted);font-size:13px;line-height:1.75}.opcode-card .card-tagline{color:var(--text);font-size:16px;font-weight:600;margin-bottom:0}.mini-label{font-size:10px;color:var(--accent);letter-spacing:.4px;padding-top:18px;margin-top:auto;border-top:1px solid var(--line)}.playground{margin-top:68px;padding:30px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}.demo-controls{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:25px}.demo-controls button{background:var(--bg);color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:10px 13px;font-size:12px}.demo-controls button[aria-pressed=true]{border-color:var(--accent);color:var(--accent);background:var(--soft)}.template-flow{display:grid;grid-template-columns:1fr 30px 1.3fr 30px 1fr;gap:10px;align-items:center}.flow-card{padding:20px 16px;border-radius:8px;background:var(--bg);border:1px solid var(--line);min-height:125px;display:flex;flex-direction:column;justify-content:center}.flow-card small{font-size:9px;letter-spacing:1.5px;color:var(--muted)}.flow-card strong{font-size:16px;margin:10px 0 5px}.flow-card span{font-size:10px;color:var(--muted)}.flow-card.digest{border-color:var(--accent)}.digest strong{color:var(--accent)}.flow-arrow{color:var(--accent);font-size:26px;text-align:center}.demo-result{padding:17px;border:1px solid var(--line);border-radius:8px;margin-top:20px;font-size:13px}.demo-result.changed{border-color:var(--accent);background:var(--soft)}.caption{font-size:11px;line-height:1.7;color:var(--muted);margin:16px 0 0}.comparison-art{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:22px}.comparison-art article{padding:26px;background:var(--panel);border:1px solid var(--line);border-radius:10px}.comparison-art .focused{border-color:var(--accent)}.comparison-art h3{font-size:22px;font-weight:650}.comparison-art p:last-child{font-size:13px;color:var(--muted);line-height:1.75;margin-bottom:0}.message-path{display:flex;align-items:center;gap:9px;margin:22px 0;font-size:12px}.message-path span{padding:12px 10px;background:var(--raised);border-radius:5px;text-align:center;flex:1}.message-path b{color:var(--accent);font-size:20px}.focused .message-path span:first-child{background:var(--soft);color:var(--accent)}.compare-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:10px}.compare-scroll table{min-width:630px;margin:0;border-collapse:collapse;width:100%;background:var(--panel)}.compare-scroll caption{text-align:left;padding:15px 20px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line)}.compare-scroll th,.compare-scroll td{white-space:normal;font-size:12px;line-height:1.7;text-align:left;padding:17px 20px;vertical-align:top;border-bottom:1px solid var(--line)}.compare-scroll thead th{color:var(--muted);font-weight:600}.compare-scroll tbody th{font-weight:550;width:22%;color:var(--text)}.compare-scroll td{width:39%;color:var(--muted)}.compare-scroll td:last-child{color:var(--text)}.compare-scroll tr:last-child>*{border-bottom:0}.usecase-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.usecase{padding:30px;background:var(--panel);border:1px solid var(--line);border-radius:12px}.usecase-title{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:25px}.pill{padding:5px 10px;border:1px solid var(--accent);border-radius:4px;color:var(--accent);font-size:10px;font-weight:700;letter-spacing:1px}.maturity{color:var(--muted);font-size:10px}.usecase h3{font-size:25px;line-height:1.25;letter-spacing:-.6px}.usecase p{color:var(--muted);font-size:13px;line-height:1.8}.usecase strong{color:var(--text)}.ark-diagram{display:flex;align-items:center;justify-content:space-between;gap:5px;min-height:154px;padding:20px 0}.ark-diagram>div{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center}.ark-diagram span{border:1px solid var(--accent);border-radius:50%;width:33px;height:33px;display:grid;place-items:center;color:var(--accent);font-size:12px}.ark-diagram strong{font-size:11px}.ark-diagram small{font-size:9px;color:var(--muted)}.ark-diagram i{font-style:normal;color:var(--accent)}.state-diagram{display:grid;grid-template-columns:1fr 28px 1fr;align-items:center;gap:10px;min-height:154px}.state-diagram>div:not(.state-arrow){border:1px solid var(--line);border-radius:8px;padding:17px 12px}.state-diagram .new-state{border-color:var(--accent)!important;background:var(--soft)}.state-diagram small{display:block;font-size:8px;letter-spacing:.5px;color:var(--muted);margin-bottom:6px}.state-diagram strong{font-size:22px}.old-state{opacity:.65}.state-arrow{color:var(--accent);font-size:23px}.usecase .caveat{font-size:11px;border-top:1px solid var(--line);padding-top:15px;margin-bottom:0}.benefit-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding:25px 0;border-bottom:1px solid var(--line)}.benefit-strip strong{display:block;font-size:15px;color:var(--accent)}.benefit-strip span{display:block;font-size:11px;color:var(--muted);margin-top:5px}.tradeoff-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}.tradeoff-grid h3{font-size:16px}.tradeoff-grid p{color:var(--muted);font-size:13px;line-height:1.8}.next-step{margin-top:45px;padding:30px;background:var(--panel);border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;justify-content:space-between;gap:30px}.next-step h2{font-size:27px}.next-step p:last-child{color:var(--muted);font-size:13px;max-width:460px}.next-step .actions{margin:0;flex-shrink:0;flex-direction:column}.reading{padding:35px 0 15px}.reading h2{font-size:15px;margin-bottom:15px}.reading>div{display:flex;flex-wrap:wrap;gap:10px 25px;font-size:12px}.reading>p{font-size:11px;color:var(--muted);margin-top:18px}.proposal footer{margin-top:30px}.proposal footer button{white-space:nowrap}
@media(max-width:900px){.hero{gap:25px}.hero h1{font-size:41px}.opcode-card{padding:20px}.opcode-card h3{font-size:12px}.template-flow{grid-template-columns:1fr 20px 1.2fr 20px 1fr;gap:5px}.flow-card{padding:15px 10px}.flow-card strong{font-size:13px}.usecase{padding:23px}.next-step{align-items:flex-start}}
@media(max-width:650px){.proposal .top{height:auto;min-height:90px;padding-top:18px;padding-bottom:18px;flex-wrap:wrap;gap:15px}.proposal .top nav{gap:22px}.hero{grid-template-columns:1fr;padding-top:40px;gap:30px}.hero h1{font-size:39px;letter-spacing:-1.6px}.hero-art{max-width:100%;padding:25px}.hero-art .payment-cloud{grid-template-columns:repeat(6,1fr);max-width:none;gap:7px}.payment-cloud span{height:35px;font-size:20px}.hero .lede{font-size:15px}.research-note{font-size:11px}.chapter{padding-top:45px}.opcode-grid,.comparison-art,.usecase-grid,.tradeoff-grid{grid-template-columns:1fr}.opcode-card{padding:24px}.opcode-card h3{font-size:16px}.playground{margin-top:40px;padding:22px 16px}.template-flow{grid-template-columns:1fr;gap:6px}.flow-arrow{transform:rotate(90deg);font-size:22px;line-height:1}.flow-card{min-height:85px;padding:16px}.flow-card strong{font-size:16px}.demo-controls button{font-size:11px;padding:10px}.comparison-art article{padding:22px}.compare-scroll th,.compare-scroll td{padding:13px}.usecase{padding:24px}.tradeoff-grid{gap:14px}.benefit-strip{grid-template-columns:1fr;gap:17px}.benefit-strip>div{padding-left:14px;border-left:2px solid var(--accent)}.next-step{flex-direction:column;padding:24px;margin-top:25px}.next-step .actions{flex-direction:row}.reading{padding-top:28px}.proposal footer{gap:18px}}
@media(prefers-reduced-motion:no-preference){.demo-controls button,.flow-card{transition:border-color .18s,background .18s}html{scroll-behavior:smooth}}

:root[data-theme=light] .proposal{--accent:#b43b12}:root[data-theme=light] .proposal .primary{color:#fff}:root[data-theme=light] .proposal .primary:hover{background:#92330f}

/* Plain-language layer; diagrams remain readable without animation or JavaScript. */
.plain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.plain-grid article{padding:26px;border-top:2px solid var(--accent);background:linear-gradient(160deg,var(--panel),var(--bg));border-radius:0 0 14px 14px}.plain-symbol{font-size:38px;color:var(--accent);display:block;margin-bottom:18px}.plain-grid h3{font-size:22px}.plain-grid p{font-size:15px;line-height:1.8;color:var(--text)}.plain-grid small{display:block;color:var(--muted);font-size:12px;line-height:1.7}.beginner-takeaway{border-left:3px solid var(--accent);padding:20px 24px;margin:24px 0;background:var(--panel);border-radius:0 12px 12px 0}.beginner-takeaway strong{font-size:18px}.beginner-takeaway p{color:var(--muted);line-height:1.8;margin:8px 0}.beginner-takeaway a{font-size:13px}.technical{margin:22px 0;border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:18px}.technical summary{font-size:14px;font-weight:650;cursor:pointer;color:var(--accent)}.technical summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px}.technical dl{display:grid;grid-template-columns:160px 1fr;gap:18px;font-size:13px;line-height:1.8}.technical dt{font-weight:700}.technical dd{margin:0;color:var(--muted)}.technical .compare-scroll{margin-top:18px}.demo-hint{color:var(--text);font-size:14px;line-height:1.8;max-width:700px}.walkthrough-button{border:1px solid var(--accent);background:var(--soft);color:var(--accent);padding:10px 14px;border-radius:7px;font-size:12px}.ark-diagram>div{padding:10px 5px;border-radius:9px;border:1px solid transparent;transition:background .25s,border-color .25s}.ark-diagram>div.active-step{border-color:var(--accent);background:var(--soft)}.usecase .walkthrough-explanation{min-height:96px;padding:16px;border-left:2px solid var(--accent);background:var(--bg);font-size:13px}.hero-art{overflow:hidden}.hero-art:after{content:"";position:absolute;width:160px;height:160px;border:1px solid var(--line);border-radius:50%;right:-90px;bottom:-95px;pointer-events:none}.opcode-card:hover{border-color:var(--accent)}
@media(prefers-reduced-motion:no-preference){.payment-cloud span{animation:payment-arrival .8s ease-out both}.payment-cloud span:nth-child(2){animation-delay:.12s}.payment-cloud span:nth-child(3){animation-delay:.24s}.payment-cloud span:nth-child(4){animation-delay:.36s}.payment-cloud span:nth-child(5){animation-delay:.48s}.payment-cloud span:nth-child(6){animation-delay:.6s}.stem{transform-origin:top;animation:connect-line .65s .7s ease-out both}.anchor-block{animation:payment-arrival .7s 1.2s ease-out both}.reveal-once{animation:section-arrival .65s ease-out both}.flow-card.updated{animation:card-update .45s ease-out}.ark-diagram>div.active-step span{animation:card-update .5s ease-out}@keyframes payment-arrival{from{opacity:0;translate:0 -10px}to{opacity:1;translate:0 0}}@keyframes connect-line{from{transform:scaleY(0)}to{transform:scaleY(1)}}@keyframes section-arrival{from{opacity:.35;translate:0 18px}to{opacity:1;translate:0 0}}@keyframes card-update{50%{box-shadow:0 0 0 4px var(--soft);border-color:var(--accent)}}}
@media(max-width:650px){.plain-grid{grid-template-columns:1fr;gap:14px}.plain-grid article{padding:22px}.plain-symbol{float:right;font-size:32px;margin:0 0 12px 12px}.plain-grid h3{font-size:21px}.technical dl{grid-template-columns:1fr;gap:6px}.technical dd{margin-bottom:12px}.technical{padding:14px}.beginner-takeaway{padding:18px}.usecase .walkthrough-explanation{min-height:130px}}
@media(prefers-reduced-motion:reduce){.ark-diagram>div{transition:none}}

/* Keep the desktop comparison table; present each property as a mobile card. */
.comparison-label{display:none}
@media(max-width:650px){
 .technical .compare-scroll{overflow:visible;border:0;border-radius:0}
 .compare-scroll table{min-width:0;display:block;background:transparent}
 .compare-scroll caption{display:block;padding:0 0 14px;border:0;font-size:11px}
 .compare-scroll thead{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
 .compare-scroll tbody{display:grid;gap:14px}
 .compare-scroll tbody tr{display:block;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--bg)}
 .compare-scroll tbody th,.compare-scroll tbody td{display:block;width:100%;padding:14px 16px;border:0;overflow-wrap:anywhere}
 .compare-scroll tbody th{background:var(--raised);font-size:14px;font-weight:700}
 .compare-scroll tbody td{font-size:13px;line-height:1.7}
 .compare-scroll tbody td:last-child{border-top:1px solid var(--line);background:var(--soft)}
 .comparison-label{display:block;margin-bottom:6px;font-size:10px;font-weight:750;letter-spacing:.8px;color:var(--muted)}
 .compare-scroll tbody td:last-child .comparison-label{color:var(--accent)}
}