:root{--kf-color-page:#f3ede1;--kf-color-page-soft:#f7f1e6;--kf-color-card:#fff;--kf-color-card-cream:#faf5e8;--kf-color-card-warm:#f0e6d2;--kf-color-card-deep:#15233f;--kf-color-ink:#15233f;--kf-color-ink-mid:#4b577a;--kf-color-ink-soft:#7a8295;--kf-color-ink-faint:#b8b0a0;--kf-color-line:#0e1a301a;--kf-color-line-soft:#0e1a300f;--kf-color-stone:#c9a87c;--kf-color-accent-arc:#c9a87c;--kf-color-accent-atlas:#6b8470;--kf-color-accent-connect:#b86b4a;--kf-color-accent-ledger:#2f5447;--kf-color-accent-console:#3d4878;--kf-color-accent-keys:#e0d4b8;--kf-color-on-arc:#f7f1e6;--kf-color-on-atlas:#f7f1e6;--kf-color-on-connect:#f7f1e6;--kf-color-on-ledger:#f7f1e6;--kf-color-on-console:#f7f1e6;--kf-color-on-keys:#15233f;--kf-color-pos:#2f5447;--kf-color-neg:#8b3a3a;--kf-color-warn:#b8855c;--kf-r-mark:12px;--kf-r-card:20px;--kf-r-block:28px;--kf-r-pill:9999px;--kf-r-chip:8px;--kf-r-input:10px;--kf-shadow-soft:0 1px 2px #14110d0a, 0 4px 16px #14110d0a;--kf-shadow-deep:0 1px 2px #14110d0a, 0 16px 40px #14110d14;--kf-shadow-btn-rest:0 1px 2px #14110d1a;--kf-shadow-btn-hover-ink:0 8px 20px #15233f38;--kf-shadow-btn-hover-line:0 8px 20px #14110d29;--kf-shadow-focus-ring:0 0 0 4px #15233f0f;--kf-space-0:0;--kf-space-1:4px;--kf-space-2:8px;--kf-space-3:12px;--kf-space-4:16px;--kf-space-5:20px;--kf-space-6:24px;--kf-space-7:28px;--kf-space-8:32px;--kf-space-10:40px;--kf-space-12:48px;--kf-space-14:56px;--kf-space-16:64px;--kf-space-20:80px;--kf-dur-fast:.16s;--kf-dur-base:.24s;--kf-dur-slow:.36s;--kf-dur-reveal:.8s;--kf-ease-out:cubic-bezier(.2, .7, .2, 1);--kf-ease-snap:cubic-bezier(.4, 0, .2, 1);--kf-font-display:"Inter Tight", "InterTight", system-ui, -apple-system, "Segoe UI", sans-serif;--kf-font-body:"Inter", system-ui, -apple-system, "Segoe UI", sans-serif;--kf-font-mono:"JetBrains Mono", ui-monospace, "Menlo", monospace;--kf-text-hero-1:clamp(48px, 5.5vw, 76px);--kf-text-hero-2:clamp(36px, 4.2vw, 56px);--kf-text-display-3:clamp(28px, 2.6vw, 36px);--kf-text-lead:19px;--kf-text-body:17px;--kf-text-sm:14px;--kf-text-xs:12px;--kf-text-eyebrow:11px;--kf-tracking-display:-.04em;--kf-tracking-display-tight:-.045em;--kf-tracking-body:-.005em;--kf-tracking-body-tight:-.008em;--kf-tracking-eyebrow:.18em;--kf-tracking-mono:.02em;--kf-line-display:1.02;--kf-line-hero:.98;--kf-line-body:1.55;--kf-line-body-tight:1.5;--kf-nav-height:64px;--kf-content-max:1240px;--kf-content-gutter:32px;--kf-page-pad-y:48px}@media (max-width:720px){:root{--kf-content-gutter:20px;--kf-page-pad-y:28px;--kf-nav-height:56px}}@media (max-width:420px){:root{--kf-content-gutter:16px;--kf-page-pad-y:24px}}.kf-theme-arc{--kf-accent:var(--kf-color-accent-arc);--kf-on-accent:var(--kf-color-on-arc)}.kf-theme-atlas{--kf-accent:var(--kf-color-accent-atlas);--kf-on-accent:var(--kf-color-on-atlas)}.kf-theme-connect{--kf-accent:var(--kf-color-accent-connect);--kf-on-accent:var(--kf-color-on-connect)}.kf-theme-ledger{--kf-accent:var(--kf-color-accent-ledger);--kf-on-accent:var(--kf-color-on-ledger)}.kf-theme-console{--kf-accent:var(--kf-color-accent-console);--kf-on-accent:var(--kf-color-on-console)}.kf-theme-keys{--kf-accent:var(--kf-color-accent-keys);--kf-on-accent:var(--kf-color-on-keys)}.kf-theme-master{--kf-accent:var(--kf-color-stone);--kf-on-accent:var(--kf-color-on-arc)}
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var(--kf-ease-out), border-color var(--kf-dur-base) var(--kf-ease-out);border:none;font-weight:500;text-decoration:none;display:inline-flex}.kf-btn:hover{transform:translateY(-1px)}.kf-btn:active{transition-duration:50ms;transform:translateY(0)}.kf-btn--primary{background:var(--kf-color-ink);color:var(--kf-color-page-soft);box-shadow:var(--kf-shadow-btn-rest)}.kf-btn--primary:hover{box-shadow:var(--kf-shadow-btn-hover-ink)}.kf-btn--ghost{color:var(--kf-color-ink);background:0 0}.kf-btn--ghost:hover{background:#14110d0d}.kf-btn--line{color:var(--kf-color-ink);border:1px solid var(--kf-color-line);background:0 0}.kf-btn--line:hover{background:var(--kf-color-ink);color:var(--kf-color-page-soft);border-color:var(--kf-color-ink);box-shadow:var(--kf-shadow-btn-hover-line)}.kf-btn--accent{background:var(--kf-accent,var(--kf-color-stone));color:var(--kf-on-accent,var(--kf-color-page-soft));box-shadow:var(--kf-shadow-btn-rest)}.kf-btn--lg{height:44px;padding:0 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var(--kf-ease-out)}.kf-card--cream{background:var(--kf-color-card-cream)}.kf-card--warm{background:var(--kf-color-card-warm)}.kf-card--deep{background:var(--kf-color-card-deep);color:var(--kf-color-page-soft);border-color:#ffffff0f}.kf-card--block{padding:var(--kf-space-8);border-radius:var(--kf-r-block)}.kf-card--hover:hover{box-shadow:var(--kf-shadow-soft);border-color:var(--kf-color-line);transform:translateY(-2px)}.kf-eyebrow{align-items:center;gap:var(--kf-space-3);font-family:var(--kf-font-body);font-size:var(--kf-text-eyebrow);letter-spacing:var(--kf-tracking-eyebrow);text-transform:uppercase;color:var(--kf-color-ink-soft);margin:0;font-weight:500;display:inline-flex}.kf-eyebrow__tick{background:var(--kf-accent,var(--kf-color-ink-soft));width:22px;height:1px;display:block}.kf-brand-band{border-radius:1px;grid-template-columns:repeat(6,1fr);width:100%;display:grid;overflow:hidden}.kf-brand-band--sm{height:4px}.kf-brand-band--md{height:6px}.kf-brand-band--lg{height:12px}.kf-brand-band 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solid var(--kf-color-line-soft);border-radius:var(--kf-r-card);padding:var(--kf-space-5);transition:transform var(--kf-dur-slow) var(--kf-ease-out), box-shadow var(--kf-dur-slow) var(--kf-ease-out), border-color var(--kf-dur-slow) var(--kf-ease-out);text-decoration:none;display:block}.kf-preview-card:hover{box-shadow:var(--kf-shadow-soft);border-color:var(--product-accent);transform:translateY(-2px)}.kf-preview-card[data-product=arc]{--product-accent:var(--kf-color-accent-arc)}.kf-preview-card[data-product=atlas]{--product-accent:var(--kf-color-accent-atlas)}.kf-preview-card[data-product=connect]{--product-accent:var(--kf-color-accent-connect)}.kf-preview-card[data-product=ledger]{--product-accent:var(--kf-color-accent-ledger)}.kf-preview-card[data-product=console]{--product-accent:var(--kf-color-accent-console)}.kf-preview-card[data-product=keys]{--product-accent:var(--kf-color-accent-keys)}.kf-preview-card__head{align-items:center;gap:var(--kf-space-2);margin-bottom:var(--kf-space-3);display:flex}.kf-preview-card__tick{background:var(--product-accent);width:18px;height:1px}.kf-preview-card__product{font-family:var(--kf-font-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--kf-color-ink-soft);font-size:10px}.kf-preview-card__title{font-family:var(--kf-font-display);font-weight:500;font-size:var(--kf-text-body);letter-spacing:-.02em;margin:0 0 var(--kf-space-2);line-height:1.25}.kf-preview-card__meta{gap:var(--kf-space-4);font-size:var(--kf-text-xs);color:var(--kf-color-ink-mid);flex-wrap:wrap;margin:0;display:flex}.kf-preview-card__open{align-items:center;gap:var(--kf-space-1);margin-top:var(--kf-space-4);font-size:var(--kf-text-xs);color:var(--product-accent);font-weight:500;display:inline-flex}.kf-nav{z-index:50;height:var(--kf-nav-height);-webkit-backdrop-filter:blur(20px)saturate(180%);border-bottom:1px solid var(--kf-color-line-soft);background:#f3ede1d9;position:sticky;top:0}.kf-nav__inner{max-width:var(--kf-content-max);height:100%;padding:0 var(--kf-content-gutter);justify-content:space-between;align-items:center;margin:0 auto;display:flex}.kf-nav__links{gap:var(--kf-space-7);display:flex}.kf-nav__link{font-size:var(--kf-text-sm);color:var(--kf-color-ink-mid);padding:var(--kf-space-1) 0;transition:color var(--kf-dur-base) 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