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900px)}.site-header{padding-inline:24px}.loop-widget{grid-template-columns:1fr;gap:40px}.loop-stage{max-width:460px;margin-inline:auto}.loop-closing{grid-template-columns:1fr;gap:22px}}@media (width<=760px){:root{--shell:calc(100vw - 40px)}html{scroll-padding-top:68px}.site-header{min-height:64px;padding-inline:18px}.desktop-nav{display:none}.mobile-nav{display:block;position:relative}.mobile-nav summary{cursor:pointer;font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;font-size:12px;list-style:none}.mobile-nav summary::-webkit-details-marker{display:none}.mobile-nav summary:after{color:var(--signal);content:"+";margin-left:8px;font-size:16px}.mobile-nav[open] summary:after{content:"−"}.mobile-nav nav{background:var(--paper);border:1px solid var(--line);width:min(280px,92vw);padding:14px 18px 18px;display:grid;position:absolute;top:40px;right:-18px;box-shadow:0 20px 44px #0b122029}.mobile-nav nav a{border-bottom:1px solid var(--line-soft);font-family:var(--mono);padding:12px 0;font-size:13px}.mobile-nav nav a:last-child{border-bottom:0}.hero-inner{padding-block:96px}.manifesto-body,.problem-grid,.ai-principles{grid-template-columns:1fr}.manifesto-body{gap:24px}.ai-principles{border-top:0}.ai-principle{border-right:0;border-top:1px solid var(--line);padding:30px 0}.loop-stage{display:none}.loop-detail-title{font-size:clamp(30px,9vw,40px)}.loop-closing{grid-template-columns:1fr}.case{grid-template-columns:1fr;gap:28px}.case-row{grid-template-columns:1fr;gap:6px}.about-grid{grid-template-columns:1fr}.about-portrait{max-width:320px}.letters-grid{grid-template-columns:1fr;gap:36px}.letter{grid-template-columns:1fr;gap:10px}.letter-meta{flex-direction:row;align-items:baseline;gap:12px}.signup-card{position:static}.contact-actions{display:grid}.contact-actions .button{width:100%}.site-footer{grid-template-columns:1fr;gap:12px;min-height:auto;padding:30px 18px}}@media 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