/* Silo marketing site. Tokens match the app's _silo_styles.html (Fraunces /
   IBM Plex, warm paper + copper accent), with a slightly darker button fill so
   white-on-copper text passes WCAG AA at body size. */
:root {
  --bg: #faf9f5; --surface: #ffffff; --surface-tint: #f3f0e8;
  --ink: #15171c; --ink-soft: #52565f; --line: #e5e1d4;
  --accent: #b8631f; --accent-strong: #8f4a13; --accent-tint: #f4e3cf; --accent-contrast: #fffaf3;
  --accent-btn: #a5581b;
  --ok-bg: #e4f1e6; --ok-ink: #1f5a2c; --err-bg: #f8e1dc; --err-ink: #8a2615; --warn-bg: #fbeed7; --warn-ink: #7a4a07;
  --shadow: 0 1px 2px rgba(20,17,10,.04), 0 10px 28px rgba(20,17,10,.06);
  --chart-bar: #c9c2b0;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a; --surface: #1b1d22; --surface-tint: #21242a;
    --ink: #f2f1ec; --ink-soft: #b7bac2; --line: #2c2f36;
    --accent: #e08a42; --accent-strong: #f2a765; --accent-tint: #3a2c1c; --accent-contrast: #1b1d22;
    --accent-btn: #e08a42;
    --ok-bg: #1d3323; --ok-ink: #a6dcb2; --err-bg: #3c1f1a; --err-ink: #f3b3a6; --warn-bg: #3a2e17; --warn-ink: #f1cf92;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 18px 40px rgba(0,0,0,.35);
    --chart-bar: #4a4d55;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 80px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: 'IBM Plex Sans', -apple-system, 'Segoe UI', sans-serif; line-height: 1.55; -webkit-font-smoothing: antialiased; overflow-wrap: break-word; }
h1, h2, h3 { font-family: 'Fraunces', Georgia, serif; font-weight: 600; letter-spacing: -.01em; text-wrap: balance; margin: 0; line-height: 1.15; }
p { margin: 0 0 14px; }
a { color: inherit; }
main a:not(.btn) { color: var(--accent-strong); text-underline-offset: 2px; }
main a:not(.btn):hover { color: var(--ink); }
code, .mono { font-family: 'IBM Plex Mono', ui-monospace, monospace; font-size: .86em; }
code { background: var(--surface-tint); padding: 1px 5px; border-radius: 4px; }
pre { background: var(--surface-tint); border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; overflow-x: auto; font-size: .92rem; line-height: 1.5; }
pre code { background: none; padding: 0; }
img, svg { max-width: 100%; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.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 { position: absolute; left: 12px; top: -48px; z-index: 50; background: var(--ink); color: var(--bg); padding: 8px 14px; border-radius: 8px; text-decoration: none; font-weight: 600; }
.skip:focus { top: 12px; }

.wrap { max-width: 1120px; margin: 0 auto; padding-inline: 24px; }
.narrow { max-width: 760px; }
.eyebrow { font-family: 'IBM Plex Mono', monospace; font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent-strong); font-weight: 500; margin: 0; }
.muted { color: var(--ink-soft); }
.small { font-size: .84rem; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border-radius: 8px; padding: 11px 18px; font-size: .95rem; font-weight: 600; border: 1px solid transparent; cursor: pointer; text-decoration: none; white-space: nowrap; font-family: inherit; line-height: 1.2; }
.btn-primary { background: var(--accent-btn); color: var(--accent-contrast); }
.btn-primary:hover { background: var(--accent-strong); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink-soft); }
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: .74rem; font-weight: 600; background: var(--surface-tint); color: var(--ink-soft); }
.pill.accent { background: var(--accent-tint); color: var(--accent-strong); }
.pill.ok { background: var(--ok-bg); color: var(--ok-ink); }
.pill.warn { background: var(--warn-bg); color: var(--warn-ink); }

/* header */
header.top { position: sticky; top: 0; z-index: 20; background: var(--bg); background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.topbar { display: flex; align-items: center; gap: 28px; padding-block: 14px; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-family: 'Fraunces', serif; font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--ink); }
.brand .mark { width: 22px; height: 22px; border-radius: 6px; background: var(--accent); position: relative; flex: none; }
.brand .mark::after { content: ""; position: absolute; inset: 5px; border: 1.6px solid var(--accent-contrast); border-radius: 2px; }
.sitenav { display: flex; align-items: center; gap: 28px; flex: 1; }
.navlinks { display: flex; gap: 24px; font-size: .94rem; list-style: none; margin: 0; padding: 0; }
.navlinks a { text-decoration: none; color: var(--ink-soft); }
.navlinks a:hover, .navlinks a[aria-current="page"] { color: var(--ink); }
.navlinks a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: 6px; }
.navcta { margin-left: auto; display: flex; align-items: center; gap: 16px; font-size: .94rem; }
.navcta a.login { text-decoration: none; color: var(--ink-soft); }
.navcta a.login:hover { color: var(--ink); }
.navcta .btn { padding: 9px 16px; font-size: .9rem; }
.menu-btn { display: none; margin-left: auto; background: transparent; border: 1px solid var(--line); border-radius: 8px; padding: 7px 9px; color: var(--ink); cursor: pointer; }

@media (max-width: 860px) {
  .js .menu-btn { display: inline-flex; }
  .topbar { flex-wrap: wrap; gap: 12px; }
  .sitenav { flex-basis: 100%; flex-direction: column; align-items: stretch; gap: 14px; padding: 8px 0 6px; }
  .js .sitenav { display: none; }
  .js .sitenav.open { display: flex; }
  .navlinks { flex-direction: column; gap: 0; }
  .navlinks a { display: block; padding: 10px 2px; border-bottom: 1px solid var(--line); }
  .navlinks a[aria-current="page"] { text-decoration: none; color: var(--accent-strong); }
  .navcta { margin-left: 0; justify-content: space-between; }
}

/* sections */
.hero { padding-block: 72px 80px; }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); line-height: 1.05; margin-top: 14px; }
.hero .lede { margin-top: 20px; font-size: 1.12rem; color: var(--ink-soft); max-width: 52ch; }
.page-hero { padding-block: 60px 48px; }
.page-hero h1 { font-size: clamp(2rem, 4.4vw, 3rem); margin-top: 12px; }
.page-hero .lede { margin-top: 16px; font-size: 1.08rem; color: var(--ink-soft); max-width: 62ch; }
.ctarow { margin-top: 28px; display: flex; gap: 14px; flex-wrap: wrap; }
.fineprint { margin-top: 14px; font-size: .84rem; color: var(--ink-soft); }
section.band { padding-block: 72px; border-top: 1px solid var(--line); }
section.tint { background: var(--surface-tint); }
.section-head { max-width: 660px; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-top: 12px; }
.section-head p { margin-top: 14px; color: var(--ink-soft); }

.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.cols2 { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 36px; }
.cols2 p { color: var(--ink-soft); }
.pullquote { background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 4px; padding: 22px 24px; align-self: start; }
.pullquote p { font-family: 'Fraunces', serif; font-size: 1.25rem; line-height: 1.32; color: var(--ink); margin: 0; }

.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin-top: 40px; }
.grid3 > * { background: var(--surface); padding: 24px; }
.grid3 h3, .card h3, .steps h3 { font-family: 'IBM Plex Sans', sans-serif; font-size: 1.02rem; font-weight: 700; letter-spacing: 0; }
.grid3 p { margin: 8px 0 0; font-size: .92rem; color: var(--ink-soft); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }

.steps { list-style: none; margin: 40px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; counter-reset: step; }
.steps li { counter-increment: step; }
.steps li::before { content: counter(step, decimal-leading-zero); font-family: 'IBM Plex Mono', monospace; font-size: .78rem; color: var(--accent-strong); display: block; margin-bottom: 10px; }
.steps p { margin: 8px 0 0; font-size: .92rem; color: var(--ink-soft); }

.checklist { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 10px; }
.checklist li { position: relative; padding-left: 26px; color: var(--ink-soft); }
.checklist li::before { content: ""; position: absolute; left: 2px; top: .42em; width: 12px; height: 7px; border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(-45deg); }
.checklist strong { color: var(--ink); }

.cta-band { padding-block: 64px; border-top: 1px solid var(--line); text-align: center; }
.cta-band h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
.cta-band p { color: var(--ink-soft); margin-top: 12px; }
.cta-band .ctarow { justify-content: center; }

/* hero diagram */
.isolation { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 22px; box-shadow: var(--shadow); }
.isolation svg { display: block; width: 100%; height: auto; }
.isolation figcaption { margin-top: 12px; font-size: .84rem; color: var(--ink-soft); }

/* svg illustration palette */
.ill .s { fill: var(--surface); stroke: var(--line); stroke-width: 1.5; }
.ill .t { fill: var(--surface-tint); stroke: var(--line); stroke-width: 1.5; }
.ill .a { fill: var(--accent); }
.ill .at { fill: var(--accent-tint); stroke: var(--accent); stroke-width: 1.5; }
.ill .ln { fill: none; stroke: var(--ink-soft); stroke-width: 1.5; }
.ill .la { fill: none; stroke: var(--accent); stroke-width: 2; }
.ill .bar { fill: var(--chart-bar); }
.ill .tx { fill: var(--ink-soft); font-family: 'IBM Plex Mono', monospace; font-size: 11px; }
.ill .txi { fill: var(--ink); font-family: 'IBM Plex Sans', sans-serif; font-size: 12px; font-weight: 600; }
.ill .dash { stroke-dasharray: 4 4; }

/* features page */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; padding-block: 56px; border-top: 1px solid var(--line); }
.feature-row:first-of-type { border-top: 0; }
.feature-row.flip .fr-copy { order: 2; }
.feature-row h2 { font-size: clamp(1.45rem, 2.6vw, 1.9rem); margin-top: 10px; }
.feature-row .fr-copy > p { color: var(--ink-soft); margin-top: 12px; }
.fr-art { background: var(--surface-tint); border: 1px solid var(--line); border-radius: 14px; padding: 24px; }
.fr-art svg { display: block; width: 100%; height: auto; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; list-style: none; padding: 0; }
.toc a { display: inline-block; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; font-size: .86rem; text-decoration: none; color: var(--ink-soft) !important; background: var(--surface); }
.toc a:hover { border-color: var(--ink-soft); color: var(--ink) !important; }

/* pricing */
.plans { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-top: 36px; }
.plan { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 22px 18px; display: flex; flex-direction: column; gap: 6px; }
.plan.featured { border-color: var(--accent); box-shadow: var(--shadow); }
.plan h3 { font-family: 'IBM Plex Sans', sans-serif; font-size: .95rem; font-weight: 700; letter-spacing: 0; }
.plan .price { font-family: 'Fraunces', serif; font-size: 2.1rem; font-weight: 600; line-height: 1.1; margin-top: 6px; }
.plan .price small { font-family: 'IBM Plex Sans', sans-serif; font-size: .85rem; font-weight: 500; color: var(--ink-soft); }
.plan .limit { font-weight: 600; font-size: .92rem; }
.plan .meta { font-size: .82rem; color: var(--ink-soft); margin: 0; }
.plan .btn { margin-top: auto; }
.plan .spacer { flex: 1; min-height: 10px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); margin-top: 24px; }
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
caption { text-align: left; padding: 12px 14px; font-size: .84rem; color: var(--ink-soft); caption-side: bottom; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
tbody tr:last-child td { border-bottom: none; }
thead th { font-size: .74rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-soft); font-weight: 600; background: var(--surface-tint); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.calc { display: grid; grid-template-columns: .9fr 1.1fr; gap: 32px; margin-top: 32px; align-items: start; }
.calc-inputs { display: grid; gap: 26px; }
.calc label { display: flex; justify-content: space-between; gap: 12px; font-weight: 600; font-size: .92rem; }
.calc output { font-family: 'IBM Plex Mono', monospace; font-weight: 500; color: var(--accent-strong); }
.calc input[type=range] { width: 100%; margin-top: 10px; accent-color: var(--accent); }
.calc .hint { font-size: .82rem; color: var(--ink-soft); margin-top: 6px; }
.calc-result { display: grid; gap: 10px; }
.cmp { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 16px; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.cmp.silo { border-color: var(--accent); }
.cmp .name { font-weight: 600; font-size: .94rem; }
.cmp .amt { font-family: 'Fraunces', serif; font-size: 1.35rem; font-weight: 600; text-align: right; font-variant-numeric: tabular-nums; }
.cmp .sub { grid-column: 1 / -1; font-size: .8rem; color: var(--ink-soft); }
.cmp .meter { grid-column: 1 / -1; height: 6px; background: var(--surface-tint); border-radius: 99px; overflow: hidden; }
.cmp .meter span { display: block; height: 100%; background: var(--chart-bar); border-radius: 99px; }
.cmp.silo .meter span { background: var(--accent); }
.note { background: var(--warn-bg); color: var(--warn-ink); border-radius: 8px; padding: 10px 12px; font-size: .86rem; }

/* faq */
.faq { margin-top: 28px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 4px 0; }
.faq summary { cursor: pointer; font-weight: 600; padding: 14px 28px 14px 0; list-style: none; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 12px; font-family: 'IBM Plex Mono', monospace; font-size: 1.1rem; color: var(--accent-strong); }
.faq details[open] summary::after { content: "\2212"; }
.faq details > div { padding: 0 0 16px; color: var(--ink-soft); }
.faq details > div p:last-child { margin-bottom: 0; }

/* prose (help + legal) */
.prose { max-width: 720px; }
.prose h2 { font-size: 1.5rem; margin: 40px 0 12px; }
.prose h3 { font-family: 'IBM Plex Sans', sans-serif; font-size: 1.05rem; font-weight: 700; letter-spacing: 0; margin: 28px 0 8px; }
.prose p, .prose li { color: var(--ink-soft); }
.prose strong { color: var(--ink); }
.prose ul, .prose ol { padding-left: 22px; margin: 0 0 16px; }
.prose li { margin-bottom: 6px; }
.prose .table-wrap { margin-block: 12px 20px; }
.callout { border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--surface); border-radius: 4px; padding: 14px 16px; margin: 20px 0; }
.callout p:last-child { margin-bottom: 0; }
.callout.warn { border-left-color: var(--warn-ink); background: var(--warn-bg); }
.callout.warn p, .callout.warn li { color: var(--warn-ink); }
.docgrid { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 48px; padding-block: 8px 72px; }
.docnav { position: sticky; top: 84px; align-self: start; font-size: .9rem; }
.docnav ul { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 2px; }
.docnav a { display: block; padding: 6px 10px; border-radius: 6px; text-decoration: none; color: var(--ink-soft) !important; }
.docnav a:hover { background: var(--surface-tint); color: var(--ink) !important; }
.docnav a[aria-current="page"] { background: var(--accent-tint); color: var(--accent-strong) !important; font-weight: 600; }
.guide-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 32px; list-style: none; padding: 0; }
.guide-list a { display: block; height: 100%; text-decoration: none; color: var(--ink) !important; }
.guide-list a:hover .card { border-color: var(--ink-soft); }
.guide-list .card { height: 100%; }
.guide-list p { color: var(--ink-soft); margin: 8px 0 0; font-size: .92rem; }
.draft-banner { background: var(--warn-bg); color: var(--warn-ink); border-bottom: 1px solid var(--line); padding: 12px 0; font-weight: 600; font-size: .92rem; }
.tbd { background: var(--warn-bg); color: var(--warn-ink); padding: 0 4px; border-radius: 3px; font-weight: 600; }

/* footer */
.site-footer { border-top: 1px solid var(--line); padding-block: 44px 28px; font-size: .88rem; color: var(--ink-soft); background: var(--surface-tint); }
.footgrid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footbrand p { margin-top: 10px; max-width: 34ch; }
.site-footer h2 { font-family: 'IBM Plex Mono', monospace; font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; font-weight: 500; color: var(--ink-soft); margin-bottom: 10px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--ink); text-decoration: underline; }
.footbase { margin-top: 32px; padding-top: 18px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; font-size: .82rem; }
.footbase p { margin: 0; }

@media (max-width: 1000px) {
  .plans { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 860px) {
  .hero-grid, .cols2, .grid3, .steps, .feature-row, .calc, .footgrid, .guide-list { grid-template-columns: 1fr; }
  .feature-row { gap: 28px; }
  .feature-row.flip .fr-copy { order: 0; }
  .plans { grid-template-columns: 1fr 1fr; }
  .docgrid { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .docnav { position: static; border: 1px solid var(--line); border-radius: 10px; padding: 12px; background: var(--surface); }
  .hero { padding-block: 44px 56px; }
  section.band { padding-block: 56px; }
}
@media (max-width: 520px) {
  .wrap { padding-inline: 16px; }
  .plans { grid-template-columns: 1fr; }
  .btn { white-space: normal; }
  .ctarow .btn { flex: 1 1 100%; }
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}