/* ---------------------------------------------------------------------------
   site.css — RF316 developer-site overhaul, 2026-09-05.

   Deliberately SEPARATE from styles.css. styles.css (38 KB, Google Fonts, the
   animated glow/grid chrome) is still what the 91 generated /apps/<slug>/ pages
   and the 88 /privacy/*.html pages load, and it must keep working unchanged.
   This file dresses only the pages rebuilt in RF316. No framework, no webfont,
   no build step: one request, system fonts, mobile first.
   --------------------------------------------------------------------------- */

:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --bg-soft: #f4f6fa;
  --bg-card: #ffffff;
  --fg: #14181f;
  --fg-muted: #5a6675;
  --line: #dfe4ec;
  --accent: #0b7f8c;
  --accent-fg: #ffffff;
  --accent-soft: #e6f4f6;
  --warn-bg: #fff6e0;
  --warn-line: #e8c96a;
  --warn-fg: #6b4e05;
  --radius: 12px;
  --measure: 40rem;
  --wrap: 68rem;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --bg-soft: #10162a;
    --bg-card: #141b2e;
    --fg: #e8ecf3;
    --fg-muted: #9fb0c7;
    --line: #243049;
    --accent: #4fd1de;
    --accent-fg: #06121a;
    --accent-soft: #12303a;
    --warn-bg: #2a2312;
    --warn-line: #6b5a1e;
    --warn-fg: #f0d98a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  overflow-wrap: break-word;
}

a { color: var(--accent); }
a:hover { text-decoration: none; }

img, video { max-width: 100%; height: auto; }

code, kbd, samp, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: .92em;
}

code {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: .08em .35em;
}

pre {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .9rem 1rem;
  overflow-x: auto;
}
pre code { background: none; border: 0; padding: 0; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 1.15rem; }
.measure { max-width: var(--measure); }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-fg);
  padding: .6rem 1rem; border-radius: 0 0 var(--radius) 0; z-index: 50;
}
.skip:focus { left: 0; }

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

.top {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
@supports not (backdrop-filter: blur(1px)) { .top { background: var(--bg); } }

.top-inner {
  display: flex; align-items: center; gap: .75rem;
  min-height: 3.5rem;
}

.brand {
  display: inline-flex; align-items: center; gap: .55rem;
  font-weight: 700; letter-spacing: -.01em;
  color: var(--fg); text-decoration: none; margin-right: auto;
}
.brand img { width: 28px; height: 28px; border-radius: 7px; display: block; }

.nav-toggle {
  display: inline-flex; align-items: center; gap: .4rem;
  background: var(--bg-card); color: var(--fg);
  border: 1px solid var(--line); border-radius: 10px;
  padding: .42rem .7rem; font: inherit; font-size: .92rem; cursor: pointer;
}

.nav {
  display: none;
  position: absolute; left: 0; right: 0; top: 100%;
  background: var(--bg); border-bottom: 1px solid var(--line);
  padding: .5rem 1.15rem 1rem;
}
.nav.is-open { display: block; }
.nav a {
  display: block; padding: .6rem .2rem;
  color: var(--fg); text-decoration: none; font-weight: 500;
  border-bottom: 1px solid var(--line);
}
.nav a:last-child { border-bottom: 0; }
.nav a[aria-current="page"] { color: var(--accent); }

@media (min-width: 46rem) {
  .nav-toggle { display: none; }
  .nav {
    display: flex; gap: .3rem; position: static;
    background: none; border: 0; padding: 0;
  }
  .nav a { border: 0; padding: .4rem .6rem; border-radius: 8px; font-size: .95rem; }
  .nav a:hover { background: var(--bg-soft); }
  .nav a[aria-current="page"] { background: var(--accent-soft); }
}

/* C93: visible breadcrumb nav, top of content, matching each page's own
   BreadcrumbList JSON-LD. */
.crumbs { font-size: .85rem; color: var(--fg-muted); margin: .9rem 0 0; }
.crumbs a { color: var(--fg-muted); text-decoration: underline; }
.crumbs a:hover { color: var(--fg); }
.crumbs .sep { margin: 0 .35em; opacity: .6; }

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

.hero { padding: 3rem 0 2.25rem; }
.hero .eyebrow {
  margin: 0 0 .5rem; font-size: .82rem; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase; color: var(--accent);
}
.hero h1 {
  margin: 0 0 .75rem;
  font-size: clamp(1.9rem, 6vw, 3rem);
  line-height: 1.12; letter-spacing: -.025em;
}
.hero p { margin: 0 0 1.4rem; max-width: var(--measure); color: var(--fg-muted); font-size: 1.06rem; }

.cta-row { display: flex; flex-wrap: wrap; gap: .6rem; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .45rem;
  padding: .62rem 1.05rem; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg-card); color: var(--fg);
  font: inherit; font-size: .95rem; font-weight: 600;
  text-decoration: none; cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.btn-primary:hover { filter: brightness(1.06); }
.btn-small { padding: .38rem .7rem; font-size: .85rem; font-weight: 500; }
.btn[aria-disabled="true"] { opacity: .5; pointer-events: none; }

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

.section { padding: 2.25rem 0; border-top: 1px solid var(--line); }
.section-soft { background: var(--bg-soft); }
.section h2 { margin: 0 0 .4rem; font-size: 1.4rem; letter-spacing: -.015em; }
.section > .wrap > p:first-of-type { margin-top: 0; color: var(--fg-muted); max-width: var(--measure); }

.grid { display: grid; gap: .85rem; grid-template-columns: 1fr; }
@media (min-width: 34rem) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 58rem) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1rem 1.05rem; box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
.card p { margin: 0 0 .7rem; color: var(--fg-muted); font-size: .94rem; }
.card .card-actions { display: flex; flex-wrap: wrap; gap: .4rem; }

.card-link { text-decoration: none; color: inherit; display: block; }
.card-link:hover { border-color: var(--accent); }

.meta { display: flex; flex-wrap: wrap; gap: .4rem; margin: 0 0 .6rem; padding: 0; list-style: none; }
.meta li {
  font-size: .76rem; color: var(--fg-muted);
  border: 1px solid var(--line); border-radius: 999px; padding: .1rem .55rem;
}

.note {
  border: 1px solid var(--warn-line); background: var(--warn-bg); color: var(--warn-fg);
  border-radius: var(--radius); padding: .85rem 1rem; margin: 1.25rem 0;
}
.note p { margin: 0 0 .5rem; }
.note p:last-child { margin: 0; }
.note strong { color: inherit; }

.facts { margin: 1.25rem 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.facts div {
  display: flex; flex-wrap: wrap; gap: .25rem 1rem;
  padding: .6rem .9rem; border-bottom: 1px solid var(--line);
  background: var(--bg-card); font-size: .93rem;
}
.facts div:last-child { border-bottom: 0; }
.facts dt { margin: 0; min-width: 8.5rem; color: var(--fg-muted); }
.facts dd { margin: 0; font-weight: 500; }
.facts dd.hash { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .78rem; word-break: break-all; }

/* ------------------------------------------------------------- catalogue */

.toolbar { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1.1rem 0 .8rem; }
.toolbar input[type="search"] {
  flex: 1 1 15rem; min-width: 0;
  padding: .55rem .8rem; font: inherit; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg-card); color: var(--fg);
}
.chips { display: flex; flex-wrap: wrap; gap: .35rem; }
.chip {
  border: 1px solid var(--line); background: var(--bg-card); color: var(--fg);
  border-radius: 999px; padding: .3rem .75rem; font: inherit; font-size: .86rem; cursor: pointer;
}
.chip[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); font-weight: 600; }

.count { color: var(--fg-muted); font-size: .9rem; margin: 0 0 .9rem; }

.app-grid { display: grid; gap: .7rem; grid-template-columns: 1fr; list-style: none; margin: 0; padding: 0; }
@media (min-width: 34rem) { .app-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 58rem) { .app-grid { grid-template-columns: repeat(3, 1fr); } }

.app-card {
  display: flex; flex-direction: column; gap: .45rem;
  background: var(--bg-card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: .85rem .9rem;
}
.app-card-head { display: flex; align-items: center; gap: .55rem; }
.app-card-head img { width: 34px; height: 34px; border-radius: 8px; flex: 0 0 auto; }
.app-card-head .fallback {
  width: 34px; height: 34px; border-radius: 8px; flex: 0 0 auto;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent-soft); color: var(--accent); font-weight: 700;
}
.app-card h3 { margin: 0; font-size: 1rem; }
.app-card .cat { display: block; font-size: .76rem; color: var(--fg-muted); font-weight: 400; }
.app-card p { margin: 0; color: var(--fg-muted); font-size: .89rem; }
.app-card .card-actions { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: auto; padding-top: .35rem; }

/* ------------------------------------------------------------------- prose */

.prose { max-width: var(--measure); }
.prose h2 { margin: 2rem 0 .5rem; font-size: 1.2rem; letter-spacing: -.01em; }
.prose h3 { margin: 1.4rem 0 .35rem; font-size: 1.02rem; }
.prose p, .prose li { color: var(--fg); }
.prose ul, .prose ol { padding-left: 1.25rem; }
.prose li { margin: .3rem 0; }
.prose .lead { color: var(--fg-muted); font-size: 1.05rem; }

.table-scroll { overflow-x: auto; margin: 1rem 0; border: 1px solid var(--line); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
th, td { text-align: left; padding: .55rem .75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--bg-soft); font-weight: 600; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }

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

.site-footer {
  border-top: 1px solid var(--line); background: var(--bg-soft);
  padding: 1.75rem 0 2.5rem; margin-top: 2rem;
  color: var(--fg-muted); font-size: .9rem;
}
.footer-cols { display: grid; gap: 1.25rem; grid-template-columns: 1fr; }
@media (min-width: 40rem) { .footer-cols { grid-template-columns: repeat(3, 1fr); } }
.site-footer h2 { font-size: .8rem; text-transform: uppercase; letter-spacing: .07em; margin: 0 0 .5rem; color: var(--fg); }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin: .2rem 0; }
.site-footer a { color: var(--fg-muted); text-decoration: none; }
.site-footer a:hover { color: var(--accent); text-decoration: underline; }
.footer-legal { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--line); }

/* -------------------------------------------------------------------- 404 */

.centre { min-height: 68vh; display: flex; align-items: center; }
.centre .wrap { text-align: center; }
.centre h1 { font-size: clamp(1.6rem, 5vw, 2.2rem); margin: .5rem 0; }
.centre p { color: var(--fg-muted); max-width: 32rem; margin: 0 auto 1.4rem; }
.centre .cta-row { justify-content: center; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}