/* patentcontinuation.com
 *
 * Rebuilt 2026-08-15. The first version was a mobile-first document stylesheet
 * that never got a desktop design: a 42rem column on a 1280px viewport left most
 * of the screen empty, every block had the same rhythm, and the brand palette
 * this repo had just written a conventions document about went unused.
 *
 * Brand values are verbatim from docs/conventions/ui-ux.md, which takes them from
 * web/web/static/css/main.css as the source of truth. Component code uses the
 * SEMANTIC names below, never the raw --brand-* values.
 *
 * The one recorded divergence still holds: brand cyan measures about 2.05:1 on
 * white, under the 4.5:1 AA floor, so cyan is for SURFACES, focus rings and the
 * glow. Accent TEXT uses the darker derived cyan.
 *
 * Self-hosted only. No CDN font, no icon set, no third-party request of any kind:
 * the CSP in main.go enforces that rather than trusting it.
 */

/* Brand type, self-hosted. Inter for body and UI, Satoshi for display and headings,
 * both upright variable only: the italic variants are another 432 KB for a surface
 * that sets no italic display type. font-src 'self' in main.go's CSP already
 * anticipated these, so no policy change is needed. Copies of
 * platform/frontend/static/fonts/, which is the same pair web/ uses. */
@font-face {
  font-family: "Inter";
  src: url("/static/fonts/InterVariable.woff2") format("woff2-variations");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Satoshi";
  src: url("/static/fonts/Satoshi-Variable.woff2") format("woff2-variations");
  font-weight: 300 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Satoshi", "Inter", ui-sans-serif, system-ui, sans-serif;

  /* Brand, verbatim. Do not adjust or re-sample. */
  --brand-black: #111111;
  --brand-white: #ffffff;
  --brand-cyan: #2dc5e8;
  --brand-purple: #4a3f78;
  --brand-purple-light: #bfa8ff;
  --brand-rose: #d4637a;
  --brand-gray-light: #e5e5e5;
  --brand-gray-bg: #f7f8fa;

  /* Semantic. Use these in component code. */
  --bg-canvas: var(--brand-white);
  --bg-subtle: var(--brand-gray-bg);
  --bg-inverse: var(--brand-black);
  --fg-default: var(--brand-black);
  --fg-muted: #55606c;
  --fg-inverse: #f2f5f7;
  --fg-on-accent: #06222b;
  --border-subtle: var(--brand-gray-light);
  --border-strong: #cdd4db;
  --accent-default: #0e7a96; /* accent TEXT: 4.95:1 on white. See divergence. */
  --accent-surface: var(--brand-cyan);
  --accent-deep: var(--brand-purple);

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  --shell: 74rem; /* full-width section inner bound */
  --prose: 38rem; /* reading measure, narrower on purpose */

  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.5rem;
  --step-3: clamp(1.6rem, 1.2rem + 1.6vw, 2.1rem);
  --step-4: clamp(2.2rem, 1.5rem + 3.2vw, 3.6rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-canvas: #0d1319;
    --bg-subtle: #141d26;
    --bg-inverse: #060a0e;
    --fg-default: #e9eff4;
    --fg-muted: #9fb1c0;
    --border-subtle: #26323e;
    --border-strong: #35434f;
    /* On a dark ground the brand cyan clears AA comfortably, so it is the accent
       here. The divergence is a light-theme problem only. */
    --accent-default: #5ad4f0;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg-canvas);
  color: var(--fg-default);
  font: var(--step-0)/1.6 var(--font-sans);
  text-rendering: optimizeLegibility;
}

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: 1rem; top: 1rem; padding: .6rem 1rem; z-index: 20;
  background: var(--accent-surface); color: var(--fg-on-accent); border-radius: var(--radius-md);
}

/* ---------- shell ---------- */

.wrap { width: 100%; max-width: var(--shell); margin: 0 auto; padding: 0 1.5rem; }
.prose { max-width: var(--prose); }

/* ---------- header ---------- */

header.site {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg-canvas) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
}
header.site .wrap {
  display: flex; align-items: center; gap: 1rem 2rem; flex-wrap: wrap;
  min-height: 4rem;
}
.brand {
  display: inline-flex; align-items: center; gap: .55rem;
  font-weight: 700; letter-spacing: -.01em; color: var(--fg-default); text-decoration: none;
  margin-right: auto;
}
.brand img { width: 1.5rem; height: 1.5rem; display: block; }
header.site nav { display: flex; flex-wrap: wrap; gap: 1.5rem; }
header.site nav a {
  color: var(--fg-muted); text-decoration: none; font-size: .97rem;
  padding: .25rem 0; border-bottom: 2px solid transparent;
}
header.site nav a:hover, header.site nav a:focus-visible {
  color: var(--fg-default); border-bottom-color: var(--accent-surface);
}

/* ---------- type ---------- */

/* Satoshi carries the display voice; the tight tracking below is part of it and
   should not be loosened. Body and UI stay on Inter via the body rule. */
h1, h2, h3 { font-family: var(--font-display); }
h1 { font-size: var(--step-4); line-height: 1.05; letter-spacing: -.025em; margin: 0 0 1rem; font-weight: 800; }
h2 { font-size: var(--step-3); line-height: 1.15; letter-spacing: -.018em; margin: 0 0 .75rem; font-weight: 700; }
h3 { font-size: var(--step-1); line-height: 1.25; margin: 0 0 .4rem; font-weight: 650; }
p { margin: 0 0 1rem; }
.lede { font-size: var(--step-1); line-height: 1.5; color: var(--fg-muted); }
.small { font-size: .92rem; color: var(--fg-muted); }
.eyebrow {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .09em;
  text-transform: uppercase; color: var(--accent-default); margin-bottom: .9rem;
}
a { color: var(--accent-default); text-underline-offset: 2px; }

/* ---------- sections ---------- */

section.band { padding: 4.5rem 0; }
section.band + section.band { border-top: 1px solid var(--border-subtle); }
section.band.tint { background: var(--bg-subtle); }
.band-head { margin-bottom: 2rem; max-width: var(--prose); }

/* ---------- hero ---------- */

.hero {
  padding: 4.5rem 0 4rem;
  background:
    radial-gradient(60rem 28rem at 78% -12%, color-mix(in srgb, var(--accent-surface) 17%, transparent), transparent 70%),
    radial-gradient(44rem 24rem at 4% 8%, color-mix(in srgb, var(--accent-deep) 11%, transparent), transparent 70%);
}
.hero-grid { display: grid; gap: 3rem; align-items: start; }
@media (min-width: 62rem) {
  .hero-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 4rem; align-items: center; }
}

/* ---------- buttons ---------- */

.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.75rem 0 1rem; }
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.4rem; border-radius: var(--radius-lg);
  font-weight: 650; font-size: 1.02rem; text-decoration: none; border: 1px solid transparent;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn-primary {
  background: var(--bg-inverse); color: var(--fg-inverse);
  box-shadow: 0 1px 2px rgba(17, 17, 17, .18);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px -8px var(--accent-surface); }
.btn-secondary { background: transparent; color: var(--fg-default); border-color: var(--border-strong); }
.btn-secondary:hover { border-color: var(--accent-surface); background: color-mix(in srgb, var(--accent-surface) 8%, transparent); }

/* ---------- the output sample: the product, shown ---------- */

.sample {
  border: 1px solid var(--border-subtle); border-radius: var(--radius-xl);
  background: var(--bg-canvas); overflow: hidden;
  box-shadow: 0 24px 60px -32px rgba(17, 17, 17, .38);
}
.sample-bar {
  display: flex; align-items: center; gap: .5rem;
  padding: .7rem 1rem; border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-subtle); font-size: .82rem; color: var(--fg-muted);
}
.dot { width: .6rem; height: .6rem; border-radius: 50%; background: var(--border-strong); }
.sample-body { padding: 1.1rem 1.2rem; display: grid; gap: .9rem; }
.sample-step { display: grid; gap: .3rem; }
.sample-label {
  font-size: .74rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--fg-muted);
}
.claim {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .86rem; line-height: 1.55;
  background: var(--bg-subtle); border-left: 3px solid var(--border-strong);
  padding: .7rem .85rem; border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.claim.out { border-left-color: var(--accent-surface); }
.flag {
  display: grid; gap: .25rem;
  border-left: 3px solid var(--brand-rose);
  background: color-mix(in srgb, var(--brand-rose) 8%, transparent);
  padding: .7rem .85rem; border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: .88rem;
}
.flag-tag { font-weight: 700; color: var(--brand-rose); font-size: .78rem; letter-spacing: .04em; }

/* ---------- card grids ---------- */

.grid { display: grid; gap: 1.25rem; }
.grid-3 { grid-template-columns: 1fr; }
@media (min-width: 44rem) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 66rem) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

.card {
  border: 1px solid var(--border-subtle); border-radius: var(--radius-xl);
  padding: 1.4rem 1.5rem; background: var(--bg-canvas);
  transition: border-color .12s ease, transform .12s ease;
}
.card:hover { border-color: var(--brand-purple-light); transform: translateY(-2px); }
.card h3 { display: flex; align-items: baseline; gap: .5rem; }
.card p:last-child { margin-bottom: 0; }
.card-rule { width: 2.2rem; height: 3px; border-radius: 2px; background: var(--accent-surface); margin-bottom: .9rem; }

/* ---------- tier cards ---------- */

.tiers { display: grid; gap: 1.25rem; grid-template-columns: 1fr; }
@media (min-width: 50rem) { .tiers { grid-template-columns: repeat(2, 1fr); } }
.tier { display: flex; flex-direction: column; }
.tier .machine { font-size: .85rem; color: var(--fg-muted); font-weight: 600; letter-spacing: .02em; }
.tier .model {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.22rem; font-weight: 700; margin: .2rem 0 .9rem; color: var(--fg-default);
}
.figs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: .9rem; }
.fig {
  border: 1px solid var(--border-subtle); border-radius: 999px;
  padding: .22rem .7rem; font-size: .82rem; color: var(--fg-muted);
}
.fig strong { color: var(--fg-default); }
.fig.warn { border-color: var(--brand-rose); color: var(--brand-rose); }
.fig.warn strong { color: var(--brand-rose); }
.tier .why { flex: 1; }
.tier .go { margin-top: 1rem; }

/* ---------- steps ---------- */

.steps { counter-reset: step; display: grid; gap: 1.5rem; max-width: 46rem; }
.step { counter-increment: step; display: grid; grid-template-columns: 2.25rem 1fr; gap: 1rem; align-items: start; }
.step::before {
  content: counter(step);
  width: 2.25rem; height: 2.25rem; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; font-size: .95rem;
  background: var(--accent-surface); color: var(--fg-on-accent);
}
.step > div > :last-child { margin-bottom: 0; }

/* ---------- code ---------- */

code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
code { background: var(--bg-subtle); padding: .1em .35em; border-radius: var(--radius-sm); font-size: .9em; }
pre {
  background: var(--bg-inverse); color: var(--fg-inverse);
  border-radius: var(--radius-lg); padding: .95rem 1.1rem; overflow-x: auto;
  font-size: .87rem; line-height: 1.6; margin: .6rem 0 0;
}
pre code { background: none; padding: 0; color: inherit; }

/* ---------- notes, tables, lists ---------- */

.note {
  border: 1px solid var(--border-subtle); border-left: 3px solid var(--accent-surface);
  background: var(--bg-subtle); border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 1.2rem 1.4rem;
}
.note h2, .note h3 { margin-top: 0; }
.note :last-child { margin-bottom: 0; }
.warnbox { border-left-color: var(--brand-rose); background: color-mix(in srgb, var(--brand-rose) 7%, transparent); }

table { border-collapse: collapse; width: 100%; font-size: .94rem; }
th, td { text-align: left; padding: .65rem .7rem; border-bottom: 1px solid var(--border-subtle); }
th { font-weight: 650; color: var(--fg-muted); font-size: .84rem; letter-spacing: .04em; text-transform: uppercase; }
.table-scroll { overflow-x: auto; }

ul.plain { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
ul.downloads { list-style: none; padding: 0; display: grid; gap: .5rem; }
ul.downloads li {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: .5rem 1rem;
  padding: .85rem 1rem; border: 1px solid var(--border-subtle); border-radius: var(--radius-lg);
}
ul.downloads li:hover { border-color: var(--accent-surface); }
ul.downloads a { font-weight: 650; }
ul.downloads code { margin-left: auto; color: var(--fg-muted); font-size: .8rem; }

/* ---------- small layout utilities ----------
 *
 * These exist because the CSP forbids inline styles, deliberately. An earlier
 * revision used style="margin-top:1rem" attributes and the browser blocked every
 * one of them: the policy this site ships was blocking the site's own markup.
 * Utilities in the stylesheet are the fix; relaxing style-src to 'unsafe-inline'
 * would have been the other one, and it would have re-opened the hole the policy
 * exists to close.
 */

.note-after { margin-top: 1rem; }
.section-gap { margin-top: 2rem; }
.sample-title { margin-left: .5rem; }

/* ---------- footer ---------- */

footer.site { border-top: 1px solid var(--border-subtle); background: var(--bg-subtle); padding: 3rem 0; }
footer.site .maturity { max-width: 46rem; font-size: .95rem; color: var(--fg-muted); }
footer.site .maturity strong { color: var(--fg-default); }
footer.site a { color: var(--brand-rose); }

/* Small screens: the nav wrapped to a second line and pushed the hero ~275px
   down on a 390px viewport, which is a lot of the fold spent on chrome. */
@media (max-width: 34rem) {
  header.site .wrap { min-height: 0; padding-top: .6rem; padding-bottom: .6rem; gap: .5rem 1rem; }
  .brand { font-size: .98rem; margin-right: 0; width: 100%; }
  header.site nav { gap: .5rem 1.1rem; width: 100%; }
  header.site nav a { font-size: .9rem; }
  .hero { padding: 2.5rem 0 3rem; }
  section.band { padding: 3rem 0; }
}

:focus-visible {
  /* --accent-default, NOT --accent-surface. WCAG 2.2 SC 1.4.11 wants 3:1 for a
     focus indicator against what it sits on, and brand cyan is 2.05:1 on the light
     canvas: the same ratio that disqualified it for text. The conventions file used
     to list focus rings alongside surfaces as a cyan role; it was corrected on
     2026-08-15 and this is the fix. Dark theme is unaffected either way (cyan runs
     about 9:1 on #0d1319), but one token that is correct in both themes beats two. */
  outline: 3px solid var(--accent-default);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .btn:hover, .card:hover { transform: none; }
}