/* Site stylesheet. Tokens from docs/design/website/site-tokens.css (source of truth), layout from site-design.md.
   Rules: no inline styles in pages (CSP style-src 'self'); gradients only as --grad-wash and --grad-band (C8);
   no text-transform or small caps (C2); motion only under prefers-reduced-motion: no-preference (C15).
   References of the form asset-colon-filename inside url() are rewritten to hashed names by build.mjs (B6). */

/* ---------- Fonts: self-hosted, latin subset, swap ---------- */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url("/inter-var.c9407645.woff2") format("woff2");
}
@font-face {
  font-family: "Newsreader";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("/newsreader-600.b0228f9d.woff2") format("woff2");
}
/* Metric-adjusted fallback for Inter (values for Arial; Newsreader falls back to Georgia unadjusted). */
@font-face {
  font-family: "Inter Fallback";
  src: local("Arial");
  size-adjust: 107.4%;
  ascent-override: 90.2%;
  descent-override: 22.5%;
  line-gap-override: 0%;
}

:root {
  color-scheme: light;
  --c-wash-top: #E1EFFF;
  --c-wash-bottom: #F6FAFF;
  --c-surface: #FFFFFF;
  --c-surface-2: #E4EFFF;
  --c-line: #D2E1F6;
  --c-border-control: #6B7AA0;
  --c-text: #0F1B3D;
  --c-muted: #46557A;
  --c-accent: #1C36A8;
  --c-accent-hover: #142A8A;
  --c-accent-active: #0F1F6E;
  --c-on-accent: #FFFFFF;
  --c-error: #B42318;
  --c-error-bg: #FDECEA;
  --c-focus: #1C36A8;
  --c-band-dark: #1C36A8;
  --c-band-light: #6FB4FF;
  --c-on-band: #FFFFFF;
  --c-band-button-bg: #FFFFFF;
  --c-band-button-text: #1C36A8;
  --c-focus-on-band-left: #FFFFFF;
  --c-focus-on-band-right: #0F1B3D;

  --grad-wash: linear-gradient(180deg, var(--c-wash-top) 0, var(--c-wash-bottom) 720px);
  --grad-band: linear-gradient(90deg, var(--c-band-dark) 0%, var(--c-band-dark) 20%, var(--c-band-light) 100%);

  --shadow-card: 0 1px 2px rgba(15, 27, 61, .06), 0 8px 24px rgba(28, 54, 168, .08);
  --shadow-frame: 0 1px 2px rgba(15, 27, 61, .08), 0 12px 32px rgba(28, 54, 168, .12);

  --font-serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-sans: "Inter", "Inter Fallback", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;

  --fs-display: 60px;
  --fs-h1: 44px;
  --fs-h2: 34px;
  --fs-h3: 22px;
  --fs-faq-q: 24px;
  --fs-lead: 21px;
  --fs-body: 17px;
  --fs-small: 15px;
  --fs-caption: 14px;
  --fs-button: 17px;
  --fs-band: 15px;
  --fs-step-n: 32px;

  --lh-display: 1.05;
  --lh-heading: 1.15;
  --lh-h3: 1.3;
  --lh-lead: 1.5;
  --lh-body: 1.6;
  --lh-small: 1.5;
  --ls-display: -0.015em;
  --ls-heading: -0.01em;

  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;
  --section-gap: 96px;
  --hero-top: 96px;
  --hero-bottom: 80px;

  --r-card: 16px;
  --r-input: 10px;
  --r-check: 4px;
  --r-code: 6px;
  --r-pill: 999px;
  --focus-ring: 3px;

  --max: 1200px;
  --gutter: 24px;
  --margin: 32px;
  --measure: 64ch;
  --band-h: 64px;
  --band-row-1: 56px;
  --band-row-2: 40px;
  --control-h: 48px;
  --band-button-h: 40px;
  --target-min: 44px;
  --step-n-col: 44px;

  --dur-fast: 120ms;
  --ease: ease-out;
}

@media (max-width: 1080px) {
  :root { --margin: 28px; --fs-display: 48px; --section-gap: 80px; }
}
@media (max-width: 760px) {
  :root {
    --margin: 20px;
    --gutter: 16px;
    --fs-display: 38px;
    --lh-display: 1.1;
    --fs-h1: 32px;
    --fs-h2: 27px;
    --fs-h3: 20px;
    --fs-faq-q: 20px;
    --fs-lead: 18px;
    --fs-step-n: 26px;
    --step-n-col: 34px;
    --section-gap: 64px;
    --hero-top: 48px;
    --hero-bottom: 48px;
    --band-button-h: 44px;
  }
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --c-wash-top: #10204A;
    --c-wash-bottom: #0C1530;
    --c-surface: #142047;
    --c-surface-2: #1B2A5A;
    --c-line: #2A3A6E;
    --c-border-control: #8090BD;
    --c-text: #E8EEFC;
    --c-muted: #A9B6D6;
    --c-accent: #8FB8FF;
    --c-accent-hover: #B3CFFF;
    --c-accent-active: #CFE0FF;
    --c-on-accent: #0C1530;
    --c-error: #FF8F84;
    --c-error-bg: #3A1620;
    --c-focus: #8FB8FF;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    --shadow-frame: 0 1px 2px rgba(0, 0, 0, .35), 0 12px 32px rgba(0, 0, 0, .3);
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 400 var(--fs-body)/var(--lh-body) var(--font-sans);
  color: var(--c-text);
  background-color: var(--c-wash-bottom);
  background-image: var(--grad-wash);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
}
:where(h1, h2, h3, p, ul, ol, figure, dl, dd) { margin: 0; }
img { max-width: 100%; }
a { color: var(--c-accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: var(--focus-ring) solid var(--c-focus); outline-offset: 3px; }
.wrap { max-width: calc(var(--max) + 2 * var(--margin)); margin: 0 auto; padding: 0 var(--margin); }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* ---------- Skip link ---------- */
.skip { position: absolute; left: -10000px; top: 12px; z-index: 2; background: var(--c-surface); color: var(--c-accent); padding: 10px 16px; border-radius: var(--r-input); font-weight: 600; }
.skip:focus { left: 16px; }

/* ---------- Header band (G1, G3): white text only in the left 45% ---------- */
.band { background-image: var(--grad-band); height: var(--band-h); color: var(--c-on-band); }
.band-in { height: 100%; display: flex; align-items: center; gap: var(--s-6); position: relative; }
.band-nav { flex: 1; display: flex; align-items: center; gap: var(--s-6); min-width: 0; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--c-on-band); text-decoration: none; font: 600 18px/1 var(--font-sans); letter-spacing: -.005em; padding: 6px 2px; flex: none; }
.logo-svg { width: 32px; height: 32px; flex: none; color: currentColor; }
.logo-svg .halo { fill: var(--c-band-dark); stroke: var(--c-band-dark); }
.band-link { color: var(--c-on-band); font: 600 var(--fs-band)/1 var(--font-sans); text-decoration: none; padding: 12px 4px; white-space: nowrap; }
.band-link:hover, .band-link[aria-current] { text-decoration: underline; text-underline-offset: 4px; }
.band .logo:focus-visible, .band .band-link:focus-visible { outline: var(--focus-ring) solid var(--c-focus-on-band-left); outline-offset: 2px; }
.band-cta { margin-left: auto; display: inline-flex; align-items: center; height: var(--band-button-h); padding: 0 18px; border-radius: var(--r-pill); background: var(--c-band-button-bg); color: var(--c-band-button-text); font: 600 var(--fs-band)/1 var(--font-sans); text-decoration: none; white-space: nowrap; }
.band-cta:hover { background: var(--c-surface-2); color: var(--c-band-button-text); }
.band .band-cta:focus-visible { outline: var(--focus-ring) solid var(--c-focus-on-band-right); outline-offset: 2px; }
@media (max-width: 760px) {
  .band { height: auto; }
  .band-in { display: grid; grid-template-columns: minmax(0, 1fr); grid-template-rows: var(--band-row-1) var(--band-row-2); gap: 0; }
  .band-nav { gap: var(--s-4); align-self: stretch; padding-bottom: 4px; }
  .band-link { padding: 10px 2px; }
  .logo { font-size: 16px; }
  .logo-svg { width: 28px; height: 28px; }
  .band-cta { position: absolute; right: var(--margin); top: calc((var(--band-row-1) - var(--band-button-h)) / 2); padding: 0 16px; }
}
@media (max-width: 379px) {
  .logo-t { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
}

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: var(--control-h); padding: 0 28px; border: 0; border-radius: var(--r-pill); background: var(--c-accent); color: var(--c-on-accent); font: 600 var(--fs-button)/1.2 var(--font-sans); text-decoration: none; cursor: pointer; }
.btn:hover { background: var(--c-accent-hover); }
.btn:active { background: var(--c-accent-active); }

/* ---------- Hero ---------- */
.hero { padding: var(--hero-top) 0 var(--hero-bottom); }
.hero h1 { font: 600 var(--fs-display)/var(--lh-display) var(--font-serif); letter-spacing: var(--ls-display); max-width: 14.5em; margin-bottom: var(--s-5); }
.lead { font-size: var(--fs-lead); line-height: var(--lh-lead); max-width: 33em; margin-bottom: var(--s-6); }
.hero-note { margin-top: var(--s-4); font-size: var(--fs-small); line-height: var(--lh-small); color: var(--c-muted); max-width: 36em; }
@media (max-width: 760px) { .hero .btn { width: 100%; } }

/* ---------- Sections ---------- */
.sec { padding-top: var(--section-gap); }
h2 { font: 600 var(--fs-h2)/var(--lh-heading) var(--font-serif); letter-spacing: var(--ls-heading); margin-bottom: var(--s-5); }
h3 { font: 600 var(--fs-h3)/var(--lh-h3) var(--font-serif); letter-spacing: 0; margin-bottom: var(--s-3); }
.prose p { max-width: var(--measure); margin-bottom: var(--s-4); }
.two { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--s-7) var(--gutter); }
.span6 { grid-column: span 6; }
@media (max-width: 760px) { .two { grid-template-columns: minmax(0, 1fr); gap: var(--section-gap); } .span6 { grid-column: auto; } }

/* Row pattern: How it works, the extra block and What comes next */
.row-item { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--s-5) var(--gutter); align-items: start; }
.row-text { grid-column: 1 / span 4; }
.row-fig { grid-column: 5 / span 8; }
.row-item.no-fig .row-text { grid-column: 1 / span 6; }
.row-text p { max-width: var(--measure); }
@media (max-width: 1080px) {
  .row-item { grid-template-columns: minmax(0, 1fr); }
  .row-text, .row-fig, .row-item.no-fig .row-text { grid-column: 1 / -1; }
}

.steps { list-style: none; padding: 0; margin-top: var(--s-7); counter-reset: step; display: flex; flex-direction: column; gap: var(--s-8); }
.step { counter-increment: step; }
.step .row-text, .extra .row-text { display: grid; grid-template-columns: var(--step-n-col) minmax(0, 1fr); align-items: baseline; }
.step .row-text::before { content: counter(step); grid-column: 1; grid-row: 1; font: 600 var(--fs-step-n)/1 var(--font-serif); color: var(--c-accent); }
.extra .row-text::before { content: ""; grid-column: 1; grid-row: 1; }
.step .row-text > *, .extra .row-text > * { grid-column: 2; }
.extra { margin-top: var(--s-8); }

/* Captures (real build; V-0) */
.cap-frame { background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--r-card); box-shadow: var(--shadow-frame); overflow: hidden; }
.cap-frame img { display: block; width: 100%; height: auto; }
.cap figcaption { margin-top: var(--s-3); font-size: var(--fs-caption); line-height: 1.45; color: var(--c-muted); }

/* Sketches (planned; no frame, no caption) */
.sk { display: block; width: 100%; height: auto; max-width: 600px; }
@media (max-width: 760px) { .sk { max-width: 420px; } }

/* What comes next */
.next-intro { max-width: var(--measure); }
.next { list-style: none; padding: 0; margin-top: var(--s-6); }
.next > li { border-top: 1px solid var(--c-line); padding: var(--s-7) 0; }
.next > li:last-child { padding-bottom: 0; }
.next .row-text { grid-column: 1 / span 5; }
.next .row-fig { grid-column: 7 / span 6; }
.next .row-item.no-fig .row-text { grid-column: 1 / span 6; }
@media (max-width: 1080px) { .next .row-text, .next .row-fig, .next .row-item.no-fig .row-text { grid-column: 1 / -1; } }
@media (max-width: 760px) { .next > li { padding: var(--s-6) 0; } }

/* Today and planned */
.lists { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); margin-top: var(--s-6); }
.list-card { grid-column: span 6; background: var(--c-surface); border-radius: var(--r-card); box-shadow: var(--shadow-card); padding: var(--s-6); }
.list-card h3 { margin-bottom: var(--s-4); }
.list-card ul { padding-left: 1.2em; margin: 0; }
.list-card li { margin-bottom: var(--s-2); }
.list-card li::marker { color: var(--c-accent); }
.after { margin-top: var(--s-5); max-width: var(--measure); }
@media (max-width: 760px) { .lists { grid-template-columns: minmax(0, 1fr); } .list-card { grid-column: auto; padding: var(--s-5); } }

/* Early access */
.ea { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--s-6) var(--gutter); align-items: start; }
.ea-intro { grid-column: 1 / span 4; }
.ea-intro p { max-width: 30em; }
.ea-card { grid-column: 6 / span 7; background: var(--c-surface); border-radius: var(--r-card); box-shadow: var(--shadow-card); padding: var(--s-6); }
@media (max-width: 1080px) { .ea { grid-template-columns: minmax(0, 1fr); } .ea-intro, .ea-card { grid-column: auto; } }
@media (max-width: 760px) { .ea-card { padding: var(--s-5) var(--s-4); } }
#early-access { scroll-margin-top: 24px; }

/* Form */
.form { position: relative; }
.field { margin: 0 0 var(--s-5); }
.label, legend { display: block; font: 600 var(--fs-small)/1.4 var(--font-sans); margin: 0 0 var(--s-2); padding: 0; color: var(--c-text); }
.opt { font-weight: 400; color: var(--c-muted); }
.input, .select select { display: block; width: 100%; height: var(--control-h); padding: 0 14px; border: 1px solid var(--c-border-control); border-radius: var(--r-input); background: var(--c-surface); color: var(--c-text); font: 400 var(--fs-body) var(--font-sans); margin: 0; }
.input::placeholder { color: var(--c-muted); opacity: 1; }
.input:focus-visible, .select select:focus-visible { outline: var(--focus-ring) solid var(--c-focus); outline-offset: 2px; border-color: var(--c-focus); }
.select { position: relative; }
.select select { appearance: none; -webkit-appearance: none; padding-right: 44px; }
.select::after { content: ""; position: absolute; right: 18px; top: 50%; width: 8px; height: 8px; border-right: 2px solid var(--c-text); border-bottom: 2px solid var(--c-text); transform: translateY(-70%) rotate(45deg); pointer-events: none; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 var(--s-4); }
fieldset { border: 0; margin: 0 0 var(--s-5); padding: 0; min-width: 0; }
.checks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 var(--s-4); }
.check { display: flex; align-items: center; gap: 10px; min-height: var(--target-min); font-size: var(--fs-body); cursor: pointer; }
.check input { width: 20px; height: 20px; margin: 0; flex: none; accent-color: var(--c-accent); }
.check.consent { align-items: flex-start; padding-top: 6px; line-height: 1.5; }
.check.consent input { margin-top: 4px; }
.notice { margin-top: var(--s-4); font-size: var(--fs-small); line-height: var(--lh-small); color: var(--c-muted); }
.err-msg { display: block; color: var(--c-error); font: 600 var(--fs-small)/1.4 var(--font-sans); margin: 0 0 var(--s-2); }
.err-msg.below { margin: var(--s-2) 0 0 30px; }
.field.is-invalid { border-left: 4px solid var(--c-error); padding-left: var(--s-4); }
.field.is-invalid .input { border: 2px solid var(--c-error); padding: 0 13px; }
.alert { background: var(--c-error-bg); border-left: 4px solid var(--c-error); border-radius: var(--r-input); padding: var(--s-4) var(--s-5); margin: 0 0 var(--s-5); color: var(--c-text); font-weight: 600; }
.hp { position: absolute; left: -10000px; top: auto; width: 1px; height: 1px; overflow: hidden; }
@media (max-width: 760px) { .row2 { grid-template-columns: minmax(0, 1fr); } .checks { grid-template-columns: repeat(2, minmax(0, 1fr)); } .form .btn { width: 100%; } }

/* Inner pages */
.page-head { padding-top: var(--s-8); padding-bottom: var(--s-6); }
.page-head h1, .msg h1 { font: 600 var(--fs-h1)/1.1 var(--font-serif); letter-spacing: var(--ls-heading); margin-bottom: var(--s-4); }
.page-head .sub { font-size: var(--fs-lead); line-height: var(--lh-lead); max-width: 36em; margin-bottom: var(--s-3); }
.updated { font-size: var(--fs-caption); color: var(--c-muted); }
.faq, .legal { max-width: 760px; }
.qa { padding: var(--s-6) 0; border-top: 1px solid var(--c-line); }
.qa h2, .legal h2 { font: 600 var(--fs-faq-q)/1.3 var(--font-serif); letter-spacing: 0; margin-bottom: var(--s-3); }
.qa p, .legal p { max-width: var(--measure); }
.faq-end { padding: var(--s-6) 0 0; border-top: 1px solid var(--c-line); max-width: 760px; }
.legal section { padding: var(--s-5) 0; border-top: 1px solid var(--c-line); }
.legal p + p, .legal p + ul, .legal ul + p { margin-top: var(--s-3); }
.legal p.line + p.line { margin-top: var(--s-1); }
.legal ul { padding-left: 1.2em; margin: 0; }
.legal li { margin-bottom: var(--s-1); }
.legal li::marker { color: var(--c-accent); }
.legal-intro { max-width: var(--measure); margin-bottom: var(--s-3); }
.msg { padding-top: var(--s-9); padding-bottom: var(--s-8); }
.msg > * { max-width: 680px; }
.msg p { margin-bottom: var(--s-4); }
.msg .sig { margin-top: var(--s-5); font-weight: 600; }
.msg .links { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-6); margin-top: var(--s-5); }
.err-head { padding-bottom: 0; }
.err-sec { padding-top: var(--s-7); }
@media (max-width: 760px) {
  .page-head { padding-top: var(--s-7); padding-bottom: var(--s-4); }
  .msg { padding-top: var(--s-8); padding-bottom: var(--s-7); }
  .err-sec { padding-top: var(--s-6); }
}

/* Footer */
.foot { margin-top: var(--section-gap); border-top: 1px solid var(--c-line); padding: var(--s-6) 0 var(--s-7); }
.foot-in { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3) var(--s-6); font-size: var(--fs-small); color: var(--c-muted); }
.foot a { color: var(--c-text); }
.foot-logo { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; text-decoration: none; }
.foot-logo .logo-svg { width: 24px; height: 24px; color: var(--c-accent); }
.foot-logo .logo-svg .halo { fill: var(--c-wash-bottom); stroke: var(--c-wash-bottom); }
.foot a[aria-current] { text-decoration-thickness: 2px; }
@media (max-width: 760px) { .foot-in { flex-direction: column; align-items: flex-start; gap: var(--s-3); } .foot-in a { padding: 4px 0; } }

/* Motion: only colour transitions and smooth scrolling, only when the visitor has not asked for less (C15) */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
  .btn, .band-cta { transition: background-color var(--dur-fast) var(--ease); }
}