:root{--bg:#ffffff;--surface:#eef0f3;--surface-warm:var(--surface);--fg:#0a0b0d;--fg-2:var(--fg);--muted:#5b616e;--meta:var(--muted);--border:rgba(91,97,110,.2);--border-soft:var(--border);--accent:#0052ff;--accent-on:#ffffff;--accent-hover:#578bfa;--accent-active:#0667d0;--success:#16a34a;--warn:#eab308;--danger:#dc2626;--font-display:"CoinbaseDisplay","Coinbase Display","Inter",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;--font-body:"CoinbaseText","CoinbaseSans","Coinbase Sans","Inter",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;--font-mono:ui-monospace,"SF Mono","JetBrains Mono",Menlo,Monaco,Consolas,monospace;--text-xs:12px;--text-sm:14px;--text-base:16px;--text-lg:18px;--text-xl:32px;--text-2xl:36px;--text-3xl:52px;--text-4xl:80px;--leading-body:1.5;--leading-tight:1;--tracking-display:-.01em;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-12:48px;--section-y-desktop:96px;--section-y-tablet:64px;--section-y-phone:40px;--radius-sm:8px;--radius-md:16px;--radius-lg:32px;--radius-pill:9999px;--elev-flat:none;--elev-ring:0 0 0 1px var(--border);--elev-raised:0 1px 2px color-mix(in oklab,var(--fg),transparent 92%);--focus-ring:0 0 0 2px var(--fg);--motion-fast:150ms;--motion-base:200ms;--ease-standard:cubic-bezier(.2,0,0,1);--container-max:1280px;--container-gutter-desktop:24px;--container-gutter-tablet:16px;--container-gutter-phone:16px}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--fg);font:var(--text-base)/var(--leading-body) var(--font-body);overflow-x:clip}body.assistant-active{overflow:hidden}img,video{display:block;max-width:100%}a{color:inherit}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit}:focus-visible{outline:0;box-shadow:var(--focus-ring)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;z-index:100;top:12px;left:12px;min-height:44px;display:flex;align-items:center;padding:0 16px;border-radius:56px;background:var(--fg);color:var(--bg);font-weight:600;text-decoration:none;transform:translateY(calc(-100% - 24px));transition:transform var(--motion-fast) var(--ease-standard)}.skip-link:focus-visible{transform:none}.container{width:min(calc(100% - 48px),var(--container-max));margin-inline:auto}.eyebrow{margin:0 0 20px;font:600 var(--text-xs)/1.5 var(--font-mono);letter-spacing:.09em;text-transform:uppercase}.display{margin:0;font-family:var(--font-display);font-weight:400;line-height:1;letter-spacing:-.025em;text-wrap:balance}.body-lg{margin:0;font-size:var(--text-lg);line-height:1.56;max-width:62ch}.muted{color:var(--muted)}
.site-header{position:relative;z-index:20;border-bottom:1px solid var(--border);background:color-mix(in oklab,var(--bg),transparent 5%);backdrop-filter:blur(14px)}.home .site-header{position:absolute;inset:0 0 auto}.nav{min-height:80px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-family:var(--font-display);font-size:22px;font-weight:600;letter-spacing:-.02em;text-decoration:none}.brand span{color:var(--accent)}.nav-links{display:flex;align-items:center;gap:clamp(12px,1.6vw,24px)}.nav-links a{min-height:44px;display:inline-flex;align-items:center;font-size:var(--text-sm);font-weight:600;text-decoration:none}.nav-links a:hover,.nav-links a[aria-current="page"]{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:6px}.nav-assistant{min-height:44px;padding:0 17px;border:1px solid var(--border);border-radius:56px;background:var(--surface);color:var(--fg);font-size:var(--text-sm);font-weight:600}.nav-assistant:hover{border-color:var(--fg);background:var(--fg);color:var(--bg)}.nav-cta{padding:10px 18px;border:1px solid var(--fg);border-radius:56px}.nav-cta:hover{background:var(--fg);color:var(--bg);text-decoration:none!important}.menu-button{display:none;width:44px;height:44px;padding:0;border:1px solid var(--border);border-radius:var(--radius-pill);background:var(--bg);align-items:center;justify-content:center}.menu-button svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.8}
.hero{position:relative;min-height:min(900px,100svh);display:grid;align-items:center;overflow:hidden;background:var(--fg) url("media/hero-bitcoin-custody-ledger-v2.png") center/cover no-repeat}.hero-media{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center}.hero-scrim{position:absolute;inset:0;background:linear-gradient(90deg,var(--bg) 0%,color-mix(in oklab,var(--bg),transparent 2%) 30%,color-mix(in oklab,var(--bg),transparent 14%) 39%,transparent 53%);pointer-events:none}.hero-content{position:relative;z-index:2;padding-block:150px 72px}.hero-copy{width:min(620px,48%)}.hero h1{font-size:clamp(3.35rem,6.1vw,5rem);max-width:10ch}.hero .body-lg{margin-top:24px;max-width:49ch}.hero-actions{margin-top:32px;display:flex;align-items:center;gap:20px}.btn{min-height:56px;display:inline-flex;align-items:center;justify-content:center;padding:0 27px;border:1px solid transparent;border-radius:56px;font-weight:600;letter-spacing:.02em;text-decoration:none;transition:background var(--motion-fast) var(--ease-standard),color var(--motion-fast) var(--ease-standard),border-color var(--motion-fast) var(--ease-standard)}.btn-primary{background:var(--accent);color:var(--accent-on);border-color:var(--accent)}.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:var(--fg)}.btn-secondary{border-color:var(--fg);background:transparent}.btn-secondary:hover{background:var(--fg);color:var(--bg)}.text-link{min-height:44px;display:inline-flex;align-items:center;font-weight:600;text-decoration:underline;text-underline-offset:5px}.hero-note{position:absolute;z-index:2;bottom:24px;left:max(24px,calc((100vw - var(--container-max))/2 + 24px));margin:0;font-size:var(--text-xs);color:var(--muted)}.media-toggle{position:absolute;z-index:3;right:max(24px,calc((100vw - var(--container-max))/2 + 24px));bottom:24px;min-width:98px;min-height:44px;padding:0 16px;border:1px solid var(--fg);border-radius:56px;background:color-mix(in oklab,var(--bg),transparent 8%);font-size:var(--text-sm);font-weight:600}.media-toggle:hover{background:var(--fg);color:var(--bg)}
.page-hero{padding-block:80px;border-bottom:1px solid var(--border)}.page-hero-grid{display:grid;grid-template-columns:minmax(0,7fr) minmax(300px,5fr);gap:clamp(48px,8vw,112px);align-items:end}.page-hero h1{font-size:clamp(3rem,6vw,5rem);max-width:12ch}.page-hero .body-lg{margin-top:24px}.page-kicker{padding-top:28px;border-top:1px solid var(--fg)}.page-kicker p{margin:0;color:var(--muted)}.section{padding-block:var(--section-y-desktop)}.section.surface{background:var(--surface)}.section.dark{background:var(--fg);color:var(--bg)}.section-head{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:end;margin-bottom:64px}.section-head h2{font-size:clamp(2.25rem,5vw,4rem);max-width:14ch}.section-head .body-lg{justify-self:end}.split{display:grid;grid-template-columns:5fr 7fr;gap:clamp(48px,8vw,112px);align-items:start}.split.reverse{grid-template-columns:7fr 5fr}.media-frame{overflow:hidden;border-radius:var(--radius-sm);background:var(--surface);aspect-ratio:4/3}.media-frame img{width:100%;height:100%;object-fit:cover}.dark .media-frame{background:var(--fg)}.dark .muted{color:color-mix(in oklab,var(--bg),transparent 28%)}
.ledger{border-top:1px solid var(--fg)}.dark .ledger{border-color:var(--bg)}.ledger-row{display:grid;grid-template-columns:72px minmax(180px,.8fr) minmax(280px,1.4fr);gap:24px;padding:25px 0;border-bottom:1px solid var(--border);align-items:start}.dark .ledger-row{border-color:color-mix(in oklab,var(--bg),transparent 82%)}.ledger-index{font-family:var(--font-mono);font-size:var(--text-sm);color:var(--muted)}.ledger-row h3{margin:0;font-size:clamp(1.3rem,2.4vw,1.8rem);font-weight:500;line-height:1.2}.ledger-row p{margin:0;color:var(--muted)}.dark .ledger-row p,.dark .ledger-index{color:color-mix(in oklab,var(--bg),transparent 30%)}.question-list,.checklist{margin:0;padding:0;list-style:none;border-top:1px solid var(--fg)}.question-list li,.checklist li{position:relative;padding:18px 0 18px 34px;border-bottom:1px solid var(--border)}.question-list li::before{content:"?";position:absolute;left:0;font-family:var(--font-mono);color:var(--muted)}.checklist li::before{content:"□";position:absolute;left:0;font-family:var(--font-mono)}.fact-table{width:100%;border-collapse:collapse;border-top:1px solid var(--fg)}.fact-table th,.fact-table td{padding:20px 16px 20px 0;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}.fact-table th{width:28%;font-weight:600}.fact-table td{color:var(--muted)}.source-link{font-weight:600;text-decoration:underline;text-underline-offset:4px}.notice{padding:24px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg)}.notice strong{display:block;margin-bottom:8px}.notice p{margin:0;color:var(--muted)}.onward{padding-block:72px}.onward-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--fg)}.onward a{display:block;min-height:150px;padding:28px 32px 28px 0;border-bottom:1px solid var(--border);text-decoration:none}.onward a+ a{padding-left:32px;border-left:1px solid var(--border)}.onward small{display:block;margin-bottom:22px;font-family:var(--font-mono);color:var(--muted)}.onward strong{font-family:var(--font-display);font-size:clamp(1.6rem,3vw,2.5rem);font-weight:400;line-height:1.08}.onward a:hover strong{text-decoration:underline;text-underline-offset:5px}.disclosure{margin:48px auto 0;max-width:900px;padding-top:24px;border-top:1px solid var(--border);color:var(--muted);font-size:var(--text-sm)}
footer{background:var(--fg);color:var(--bg);padding:56px 0}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}.footer-brand p{max-width:34ch;color:color-mix(in oklab,var(--bg),transparent 34%);font-size:var(--text-sm)}.footer-links{display:grid;align-content:start;gap:8px}.footer-links strong{margin-bottom:8px;font-size:var(--text-sm)}.footer-links a{min-height:44px;display:inline-flex;align-items:center;color:var(--bg);font-size:var(--text-sm);text-underline-offset:4px}.copyright{grid-column:1/-1;margin:16px 0 0;padding-top:24px;border-top:1px solid color-mix(in oklab,var(--bg),transparent 82%);color:color-mix(in oklab,var(--bg),transparent 40%);font-size:var(--text-xs)}
.assistant-open-floating{position:fixed;z-index:30;right:16px;bottom:16px;min-height:52px;display:none;align-items:center;gap:10px;padding:0 20px;border:1px solid var(--fg);border-radius:56px;background:var(--fg);color:var(--bg);font-size:var(--text-sm);font-weight:600}.assistant-open-floating:hover{background:var(--surface);color:var(--fg)}.assistant-open-floating svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8}.assistant-open-floating[hidden]{display:none!important}.assistant-dialog{width:min(460px,calc(100% - 48px));height:min(760px,calc(100dvh - 48px));max-width:none;max-height:none;margin:auto 24px 24px auto;padding:0;overflow:hidden;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--bg);color:var(--fg);box-shadow:0 24px 80px color-mix(in oklab,var(--fg),transparent 76%)}.assistant-dialog::backdrop{background:color-mix(in oklab,var(--fg),transparent 36%)}.assistant-shell{height:100%;min-height:0;display:grid;grid-template-rows:auto auto minmax(0,1fr) auto}.assistant-header{display:flex;align-items:flex-start;justify-content:space-between;gap:24px;padding:24px;border-bottom:1px solid var(--border)}.assistant-header .eyebrow{margin-bottom:8px}.assistant-header h2{margin:0;font-family:var(--font-display);font-size:var(--text-xl);font-weight:400}.assistant-close{width:44px;height:44px;display:grid;place-items:center;padding:0;border:1px solid var(--border);border-radius:var(--radius-pill);background:var(--bg)}.assistant-close:hover{background:var(--fg);color:var(--bg)}.assistant-close svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8}.assistant-intro{padding:18px 24px 0}.assistant-intro p{margin:0;color:var(--muted);font-size:var(--text-sm)}.assistant-starters{margin-top:18px;border-top:1px solid var(--border)}.assistant-starter{width:100%;min-height:48px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:11px 0;border:0;border-bottom:1px solid var(--border);background:var(--bg);text-align:left;font-size:var(--text-sm);font-weight:600}.assistant-starter::after{content:"→";font-size:18px}.assistant-starter:hover{background:var(--surface);box-shadow:inset 4px 0 0 var(--fg)}.assistant-starters[hidden]{display:none}.assistant-log{min-height:0;overflow-y:auto;display:flex;flex-direction:column;gap:20px;padding:22px 24px}.assistant-empty{margin:auto 0;color:var(--muted);font-size:var(--text-sm);text-align:center}.assistant-message{max-width:88%}.assistant-message[data-role="user"]{align-self:flex-end;padding:13px 16px;border-radius:16px 16px 4px 16px;background:var(--surface)}.assistant-message[data-role="assistant"]{align-self:flex-start}.assistant-message-label{display:block;margin-bottom:4px;font-size:var(--text-xs);font-weight:600;color:var(--muted)}.assistant-message-text{white-space:pre-wrap;overflow-wrap:anywhere}.assistant-pending{align-self:flex-start;color:var(--muted);font-size:var(--text-sm)}.assistant-composer{padding:14px 24px 20px;border-top:1px solid var(--border)}.assistant-error{margin:0 0 12px;padding:10px 12px;border:1px solid var(--danger);border-radius:8px;font-size:var(--text-sm)}.assistant-error[hidden],.assistant-retry[hidden]{display:none}.assistant-retry{min-height:44px;margin:-6px 0 8px;padding:0;border:0;background:transparent;font-weight:600;text-decoration:underline}.assistant-field{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:end}.assistant-field textarea{width:100%;min-height:72px;max-height:144px;resize:vertical;padding:13px 14px;border:1px solid var(--border);border-radius:16px;background:var(--bg);color:var(--fg);font:inherit}.assistant-field textarea:focus-visible{border-color:var(--fg);outline:0;box-shadow:var(--focus-ring)}.assistant-send{min-width:92px;min-height:52px;padding:0 20px;border:1px solid var(--accent);border-radius:56px;background:var(--accent);color:var(--accent-on);font-weight:600}.assistant-send:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:var(--fg)}.assistant-send:disabled,.assistant-field textarea:disabled{cursor:not-allowed;opacity:.58}.assistant-meta{min-height:22px;display:flex;justify-content:space-between;margin-top:8px;color:var(--muted);font-size:var(--text-xs)}.assistant-disclaimer{margin:8px 0 0;color:var(--muted);font-size:var(--text-xs)}
@media(max-width:1024px){.nav-links{gap:10px}.nav-cta{display:none}.section-head,.split,.split.reverse{grid-template-columns:1fr;gap:36px}.section-head .body-lg{justify-self:start}.page-hero-grid{grid-template-columns:1fr}.page-kicker{max-width:65ch}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}}
@media(max-width:896px){.container{width:calc(100% - 32px)}.nav{min-height:72px}.menu-button{display:flex}.nav-links{position:absolute;top:72px;left:16px;right:16px;display:none;padding:16px;background:var(--bg);border:1px solid var(--border);border-radius:16px;box-shadow:var(--elev-raised)}.nav-links[data-open="true"]{display:grid}.nav-links a{padding-inline:12px}.nav-cta{display:inline-flex}.assistant-open-floating{display:inline-flex}.hero-media{height:460px;top:auto;object-position:center}.hero-scrim{background:linear-gradient(180deg,var(--bg) 0%,var(--bg) 42%,color-mix(in oklab,var(--bg),transparent 8%) 50%,transparent 64%)}.hero-content{padding:128px 0 500px}.hero-copy{width:min(620px,88%)}.section,.page-hero{padding-block:var(--section-y-tablet)}.ledger-row{grid-template-columns:52px minmax(160px,.75fr) minmax(220px,1.25fr)}.onward-grid{grid-template-columns:1fr}.onward a+ a{padding-left:0;border-left:0}}
@media(min-width:641px) and (max-width:896px) and (max-height:700px){.hero{min-height:562px}.hero-media{inset:0;width:100%;height:100%;object-position:center}.hero-scrim{background:linear-gradient(90deg,var(--bg) 0%,color-mix(in oklab,var(--bg),transparent 2%) 34%,color-mix(in oklab,var(--bg),transparent 18%) 43%,transparent 56%)}.hero-content{padding:84px 0 54px}.hero-copy{width:46%}.hero h1{font-size:clamp(2.35rem,5.4vw,3rem)}.hero .body-lg{margin-top:14px;font-size:15px;line-height:1.42}.hero-actions{margin-top:16px}.hero-actions .btn{min-height:48px;padding-inline:21px}.hero-actions .text-link{display:none}.hero-note{bottom:10px;max-width:30ch}.media-toggle{right:16px;bottom:10px}.assistant-open-floating{top:88px;right:16px;bottom:auto;min-height:48px;padding-inline:16px}}
@media(max-width:640px){.hero{min-height:844px}.hero-content{padding:92px 0 300px}.hero-copy{width:100%}.hero h1{font-size:clamp(2.8rem,14vw,3.6rem)}.hero .body-lg{font-size:16px;line-height:1.48}.hero-actions{margin-top:24px;align-items:flex-start;flex-direction:column;gap:8px}.hero-media{height:auto;aspect-ratio:16/9;object-position:center}.hero-scrim{background:linear-gradient(180deg,var(--bg) 0%,var(--bg) 64%,color-mix(in oklab,var(--bg),transparent 5%) 71%,transparent 80%)}.hero-note{bottom:236px;left:16px;max-width:28ch}.media-toggle{right:16px;bottom:16px}.page-hero{padding-block:48px}.page-hero h1{font-size:clamp(2.7rem,14vw,3.6rem)}.section{padding-block:var(--section-y-phone)}.section-head{margin-bottom:36px}.ledger-row{grid-template-columns:42px 1fr;gap:10px 16px;padding:20px 0}.ledger-row p{grid-column:2}.fact-table,.fact-table tbody,.fact-table tr,.fact-table th,.fact-table td{display:block}.fact-table th{width:auto;padding-bottom:4px;border-bottom:0}.fact-table td{padding-top:0}.onward{padding-block:48px}.footer-grid{grid-template-columns:1fr;gap:28px}.footer-brand{grid-column:auto}.copyright{grid-column:auto}.assistant-open-floating{width:52px;padding:0;justify-content:center}.assistant-open-floating span{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.assistant-dialog{width:100%;height:100dvh;margin:0;border:0;border-radius:0}.assistant-header{padding:20px 16px 16px}.assistant-intro,.assistant-log{padding-inline:16px}.assistant-composer{padding:12px 16px max(16px,env(safe-area-inset-bottom))}.assistant-field{grid-template-columns:1fr}.assistant-send{width:100%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.hero-media{display:none}.btn,.skip-link,.assistant-starter{transition:none}}