/* Visibilai website. System fonts only (nothing downloaded), light and dark themes, mobile first. */

:root {
  color-scheme: light dark;
  --bg: #f6f4ee;
  --surface: #fffdf8;
  --surface-2: #efece3;
  --ink: #16181b;
  --muted: #4c525c;
  --line: #d9d4c7;
  --accent: #0a6a4c;
  --accent-ink: #ffffff;
  --accent-soft: #dcefe6;
  --mark: #e4ec4f;
  --warn-bg: #fbf0d9;
  --warn-ink: #5c3a00;
  --focus: #0a58ca;
  --shadow: 0 1px 0 rgba(22, 24, 27, .04), 0 12px 32px -18px rgba(22, 24, 27, .28);

  --serif: "Iowan Old Style", "Charter", "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  --wrap: 72rem;
  --gutter: clamp(1rem, 4vw, 2rem);
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1113;
    --surface: #171a1d;
    --surface-2: #1d2125;
    --ink: #ecebe4;
    --muted: #a9afb8;
    --line: #2c3237;
    --accent: #5fd3a6;
    --accent-ink: #062018;
    --accent-soft: #15302a;
    --mark: #c9d23c;
    --warn-bg: #2e2412;
    --warn-ink: #f3d9a4;
    --focus: #8ab4ff;
    --shadow: 0 1px 0 rgba(0, 0, 0, .3), 0 16px 40px -20px rgba(0, 0, 0, .8);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.0625rem/1.65 var(--sans);
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--accent); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.15; letter-spacing: -.01em; margin: 0 0 .6em; text-wrap: balance; }
h1 { font-size: clamp(2.3rem, 6vw, 3.7rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.75rem, 4vw, 2.6rem); }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; }
code, pre { font-family: var(--mono); font-size: .9em; }
pre { background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; padding: 1rem; overflow-x: auto; line-height: 1.5; }
:not(pre) > code { background: var(--surface-2); padding: .1em .35em; border-radius: 5px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.skip-link { position: absolute; left: 1rem; top: -4rem; z-index: 10; background: var(--ink); color: var(--bg); padding: .6rem 1rem; border-radius: 8px; }
.skip-link:focus { top: 1rem; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); }

/* Header */
.site-header { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; gap: 1rem; min-height: 4rem; }
.brand { display: inline-flex; align-items: center; gap: .55rem; color: var(--ink); text-decoration: none; font: 600 1.35rem/1 var(--serif); letter-spacing: -.01em; }
.brand svg { width: 1.85rem; height: 1.85rem; flex: none; }
.nav-toggle { display: none; margin-left: auto; font: inherit; font-size: .95rem; color: var(--ink); background: transparent; border: 1px solid var(--line); border-radius: 999px; padding: .4rem .95rem; cursor: pointer; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 1.25rem; }
.nav ul { list-style: none; display: flex; gap: 1.1rem; margin: 0; padding: 0; }
.nav a:not(.btn) { color: var(--ink); text-decoration: none; font-size: .95rem; }
.nav a:not(.btn):hover, .nav a[aria-current="page"] { text-decoration: underline; }

.js .nav-toggle { display: none; }
@media (max-width: 1080px) {
  .js .nav-toggle { display: inline-block; }
  .js .nav { display: none; position: absolute; left: 0; right: 0; top: 100%; background: var(--bg); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; padding: 1rem var(--gutter) 1.25rem; gap: 1rem; }
  .js .nav.is-open { display: flex; }
  .js .nav ul { flex-direction: column; gap: .2rem; }
  .js .nav ul a { display: block; padding: .55rem 0; font-size: 1.05rem; }
  html:not(.js) .nav { flex-wrap: wrap; }
  html:not(.js) .site-header .wrap { flex-wrap: wrap; padding-bottom: .75rem; }
  html:not(.js) .nav ul { flex-wrap: wrap; gap: .4rem 1rem; }
}

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 2.9rem; padding: .7rem 1.3rem; border-radius: 999px; font: 600 1rem/1.1 var(--sans); text-decoration: none; border: 1.5px solid transparent; cursor: pointer; transition: transform .15s ease, background-color .15s ease; }
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-ghost { color: var(--ink); border-color: var(--ink); background: transparent; }
.btn-sm { min-height: 2.4rem; padding: .45rem 1rem; font-size: .92rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.75rem 0 1.25rem; }

/* Hero */
.hero { padding: clamp(2.5rem, 7vw, 5.5rem) 0 clamp(2.5rem, 6vw, 4.5rem); position: relative; }
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background:
  radial-gradient(60rem 26rem at 85% -10%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 70%),
  repeating-linear-gradient(0deg, transparent 0 31px, color-mix(in srgb, var(--line) 40%, transparent) 31px 32px);
  mask-image: linear-gradient(to bottom, #000 40%, transparent); -webkit-mask-image: linear-gradient(to bottom, #000 40%, transparent); }
.hero-grid { display: grid; gap: 2.5rem; align-items: center; }
@media (min-width: 960px) { .hero-grid { grid-template-columns: 1.1fr .9fr; gap: 3.5rem; } }
.eyebrow { font: 600 .8rem/1.2 var(--mono); text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin-bottom: 1rem; }
.lede { font-size: clamp(1.1rem, 2.2vw, 1.28rem); color: var(--muted); max-width: 40rem; }
.lede strong { color: var(--ink); font-weight: 600; }
.hl { background: linear-gradient(transparent 58%, color-mix(in srgb, var(--mark) 75%, transparent) 58% 92%, transparent 92%); padding: 0 .08em; }
@media (prefers-color-scheme: dark) { .hl { background: none; color: var(--accent); } }
.facts { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: .5rem; }
.facts li { font-size: .88rem; border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: .3rem .8rem; }

.js .rise { animation: rise .7s cubic-bezier(.2, .7, .2, 1) both; animation-delay: calc(var(--i, 0) * 80ms); }
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* Sample report card (illustration) */
.report { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1.25rem; font-size: .95rem; }
.report-head { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; border-bottom: 1px dashed var(--line); padding-bottom: .8rem; margin-bottom: .9rem; }
.report-q { font-family: var(--serif); font-size: 1.12rem; line-height: 1.3; }
.tag { display: inline-block; font: 600 .72rem/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); border: 1px solid var(--line); border-radius: 6px; padding: .3rem .45rem; white-space: nowrap; }
.tag.ok { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); }
.rows { display: grid; gap: .85rem; margin: 0; padding: 0; list-style: none; }
.row { display: grid; grid-template-columns: 6.5rem 1fr auto; gap: .75rem; align-items: center; }
.row b { font-weight: 600; }
.range { position: relative; height: .7rem; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--line); }
.range span { position: absolute; top: -1px; bottom: -1px; left: var(--lo); width: calc(var(--hi) - var(--lo)); background: var(--accent); border-radius: 999px; opacity: .85; }
.range::after { content: ""; position: absolute; top: -4px; bottom: -4px; left: var(--mid); width: 2px; background: var(--ink); border-radius: 2px; }
.band { font: 600 .78rem/1 var(--mono); color: var(--muted); min-width: 5.5rem; text-align: right; }
.report-foot { margin-top: 1rem; padding-top: .85rem; border-top: 1px dashed var(--line); display: grid; gap: .5rem; }
.fixline { display: flex; gap: .6rem; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.chip { font-size: .8rem; font-weight: 600; border-radius: 999px; padding: .25rem .7rem; border: 1px solid var(--line); background: var(--surface-2); }
.chip.go { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.illus { margin-top: .6rem; font: .75rem/1.2 var(--mono); color: var(--muted); text-align: right; }

/* Sections */
.sec { padding: clamp(3rem, 8vw, 6rem) 0; border-top: 1px solid var(--line); }
.sec-head { max-width: 46rem; margin-bottom: 2.25rem; }
.sec-num { font: 600 .8rem/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin-bottom: .9rem; display: block; }

.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; counter-reset: step; }
@media (min-width: 720px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .steps { grid-template-columns: repeat(4, 1fr); } }
.steps li { counter-increment: step; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.35rem 1.25rem 1.25rem; position: relative; }
.steps li::before { content: "0" counter(step); font: 600 .8rem/1 var(--mono); color: var(--muted); display: block; margin-bottom: 1.4rem; }
.steps h3 { font-size: 1.55rem; margin-bottom: .4rem; }
.steps p { color: var(--muted); margin: 0; font-size: .98rem; }
@media (min-width: 1080px) { .steps li:not(:last-child)::after { content: "→"; position: absolute; right: -.95rem; top: 1.1rem; font-size: 1.1rem; color: var(--muted); background: var(--bg); padding: 0 .15rem; } }

.split { display: grid; gap: 2rem; }
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; gap: 3rem; } }

.cards { display: grid; gap: 1rem; }
@media (min-width: 720px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .cards.c3 { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.35rem; }
.card h3 { margin-bottom: .45rem; }
.card p:last-child { margin-bottom: 0; }
.card p { color: var(--muted); }

.ledger { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.ledger li { display: grid; gap: .25rem 2rem; padding: 1rem 0; border-bottom: 1px solid var(--line); }
@media (min-width: 720px) { .ledger li { grid-template-columns: 15rem 1fr; } }
.ledger b { font-family: var(--serif); font-size: 1.12rem; font-weight: 600; }
.ledger span { color: var(--muted); }

.callout { background: var(--accent-soft); border-radius: var(--radius); padding: 1.1rem 1.25rem; margin-top: 1.5rem; }
.callout p:last-child { margin: 0; }
.notice { background: var(--warn-bg); color: var(--warn-ink); border-radius: var(--radius); padding: 1rem 1.2rem; margin: 0 0 2rem; }
.notice p:last-child { margin: 0; }
.notice a { color: inherit; }

/* Pricing */
.plans { display: grid; gap: 1rem; }
@media (min-width: 640px) { .plans { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .plans { grid-template-columns: repeat(3, 1fr); } }
.plan { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem 1.25rem; display: flex; flex-direction: column; }
.plan.featured { border: 2px solid var(--accent); }
.plan h3 { font-size: 1.4rem; margin-bottom: .2rem; }
.plan .who { color: var(--muted); font-size: .92rem; min-height: 2.8em; margin-bottom: .8rem; }
.price { font: 600 2.3rem/1 var(--serif); margin: 0; }
.price small { font: 400 .95rem/1 var(--sans); color: var(--muted); }
.yearly { color: var(--muted); font-size: .88rem; margin: .4rem 0 1rem; }
.plan ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .45rem; font-size: .95rem; border-top: 1px solid var(--line); padding-top: 1rem; }
.plan li { padding-left: 1.3rem; position: relative; }
.plan li::before { content: ""; position: absolute; left: 0; top: .55em; width: .55rem; height: .3rem; border-left: 2px solid var(--accent); border-bottom: 2px solid var(--accent); transform: rotate(-45deg); }
.fineprint { color: var(--muted); font-size: .92rem; margin-top: 1.25rem; max-width: 52rem; }

/* FAQ (native details: works without JavaScript) */
.faq { border-top: 1px solid var(--line); max-width: 52rem; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 1.1rem 2.5rem 1.1rem 0; position: relative; font: 600 1.15rem/1.35 var(--serif); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: .25rem; top: 1rem; font: 400 1.5rem/1 var(--sans); color: var(--muted); }
.faq details[open] summary::after { content: "–"; }
.faq .a { padding: 0 0 1.1rem; color: var(--muted); }
.faq .a p:last-child { margin: 0; }

/* Final CTA */
.final { padding: clamp(3.5rem, 9vw, 6.5rem) 0; text-align: center; border-top: 1px solid var(--line); background: var(--surface); }
.final h2 { max-width: 34rem; margin-left: auto; margin-right: auto; }
.final p { color: var(--muted); max-width: 36rem; margin: 0 auto 1.6rem; }
.final .mark { width: 3rem; height: 3rem; margin: 0 auto 1.2rem; }

/* Inner pages */
.page-head { padding: clamp(2.5rem, 7vw, 4.5rem) var(--gutter) 1.5rem; }
.page-head h1 { font-size: clamp(2.1rem, 5.5vw, 3.4rem); max-width: 48rem; }
.crumbs { font-size: .88rem; color: var(--muted); margin-bottom: 1.25rem; }
.crumbs a { color: var(--muted); }
.prose { padding-bottom: 4rem; }
.prose > * { max-width: 46rem; }
.prose h2 { font-size: clamp(1.5rem, 3.4vw, 2rem); margin-top: 2.6rem; }
.prose h3 { margin-top: 1.8rem; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin-bottom: .45rem; }
.prose .meta { color: var(--muted); font-size: .92rem; }
.toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.25rem; margin: 1rem 0 2rem; }
.toc h2 { font-size: 1rem; font-family: var(--sans); margin: 0 0 .5rem; }
.toc ol { margin: 0; }
.tldr { border-left: 4px solid var(--accent); padding: .25rem 0 .25rem 1.1rem; margin: 1.5rem 0; }
.ev { font: 600 .72rem/1 var(--mono); letter-spacing: .05em; text-transform: uppercase; border-radius: 5px; padding: .2rem .4rem; vertical-align: .1em; white-space: nowrap; }
.ev-strong { background: var(--accent-soft); color: var(--accent); }
.ev-mixed { background: var(--surface-2); color: var(--muted); }
.ev-weak { background: var(--warn-bg); color: var(--warn-ink); }
.sources { font-size: .92rem; }
.sources li { overflow-wrap: anywhere; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); margin: 1.5rem 0; }
table { border-collapse: collapse; width: 100%; min-width: 46rem; font-size: .95rem; }
caption { text-align: left; padding: 1rem 1rem .25rem; color: var(--muted); font-size: .9rem; }
th, td { text-align: left; vertical-align: top; padding: .8rem 1rem; border-bottom: 1px solid var(--line); }
thead th { font: 600 .8rem/1.3 var(--mono); text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
tbody th { font-weight: 600; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
td.us { background: var(--accent-soft); }

/* Forms */
.form { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(1.25rem, 3vw, 2rem); box-shadow: var(--shadow); display: grid; gap: 1.1rem; }
.field label, .field .label { display: block; font-weight: 600; margin-bottom: .35rem; }
.field .hint { display: block; color: var(--muted); font-size: .9rem; margin-top: .3rem; }
.field input[type="text"], .field input[type="url"], .field input[type="email"], .field select {
  width: 100%; font: inherit; color: var(--ink); background: var(--bg); border: 1.5px solid var(--line); border-radius: 10px; padding: .7rem .85rem; min-height: 2.9rem; }
.field select { -webkit-appearance: none; appearance: none; padding-right: 2.5rem; cursor: pointer;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 1.25rem) 55%, calc(100% - .9rem) 55%; background-size: .36rem .36rem; background-repeat: no-repeat; }
.field input:focus-visible, .field select:focus-visible { border-color: var(--focus); }
.check { display: flex; gap: .6rem; align-items: flex-start; font-size: .95rem; }
.check input { width: 1.15rem; height: 1.15rem; margin-top: .2rem; accent-color: var(--accent); flex: none; }
.form-status { border-radius: 10px; padding: 1rem 1.1rem; background: var(--accent-soft); }
.form-status[hidden] { display: none; }
.form-status.warn { background: var(--warn-bg); color: var(--warn-ink); }
.form-status p:last-child { margin: 0; }
.form-status a { color: inherit; }
.error { color: #b3261e; font-size: .92rem; margin-top: .3rem; }
@media (prefers-color-scheme: dark) { .error { color: #ffb4ab; } }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 3rem 0 2.5rem; font-size: .95rem; }
.footer-grid { display: grid; gap: 2rem; }
@media (min-width: 760px) { .footer-grid { grid-template-columns: 1.5fr 1fr 1fr 1fr; } }
.site-footer h2 { font: 600 .78rem/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: .9rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .45rem; }
.site-footer a:not(.brand) { color: var(--ink); text-decoration: none; }
.site-footer a:not(.brand):hover { text-decoration: underline; }
.legal { color: var(--muted); font-size: .85rem; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line); max-width: 60rem; }
.legal p { margin: 0 0 .6rem; }

@media print { .site-header, .site-footer, .final, .cta-row { display: none; } body { background: #fff; color: #000; } }

/* Nod mark (inline SVG): a head over a tick, the nod of approval */
.mk-bg { fill: var(--accent); }
.mk-dot { fill: var(--bg); }
.mk-tick { fill: none; stroke: var(--bg); }
.final .mark .mk-bg { fill: none; stroke: var(--ink); stroke-width: 2.5; }
.final .mark .mk-dot { fill: var(--ink); }
.final .mark .mk-tick { stroke: var(--ink); }