/* PermaQR — plain paper, ink, one accent colour. */
@font-face { font-family: "Instrument Sans"; src: url("/assets/fonts/instrument-sans-latin-wght-normal.woff2") format("woff2"); font-weight: 400 700; font-display: swap; }
@font-face { font-family: "Plex Mono"; src: url("/assets/fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2"); font-weight: 500; font-display: swap; }

:root {
  --paper: #f7f5f0;
  --paper-2: #e9e1d2;
  --card: #fbf8f1;
  --ink: #1a1916;
  --ink-2: #3d3a34;
  --muted: #6f695e;
  --line: #d8cdb9;
  --accent: #e2462a;
  --accent-dark: #b8321a;
  --accent-soft: #f8dcd2;
  --ok: #1f6b47;
  --ok-soft: #dcebe1;
  --display: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --sans: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 16px;
  --max: 1140px;
  --shadow: 0 1px 2px rgba(26,25,22,.08);
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; color: var(--ink); font: 17px/1.6 var(--sans);
  background: var(--paper);
}
a { color: var(--ink); text-decoration-color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 2px; }
a:hover { color: var(--accent-dark); }
img, svg { max-width: 100%; }
code { font-family: var(--mono); font-size: .9em; background: var(--paper-2); padding: 1px 6px; border-radius: 6px; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 780px; }
.mono { font-family: var(--mono); letter-spacing: .02em; }

/* ---------- header / footer ---------- */
.top { position: sticky; top: 0; z-index: 20; background: var(--paper); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 66px; }
.logo { display: flex; align-items: center; gap: 10px; font: 700 20px/1 var(--sans); color: var(--ink); text-decoration: none; letter-spacing: -.02em; }
.logo img { width: 30px; height: 30px; }
.nav { display: flex; gap: 22px; align-items: center; font-size: 15px; }
.nav a { color: var(--ink-2); text-decoration: none; }
.nav a:hover { color: var(--ink); }
.nav .btn { color: #fff; }
@media (max-width: 860px) { .nav a:not(.btn):not(.keep) { display: none; } }

footer { margin-top: 0; padding: 48px 0 110px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); background: var(--paper); }
footer .cols { display: flex; gap: 40px; flex-wrap: wrap; justify-content: space-between; }
footer strong { color: var(--ink); font-size: 15px; }
footer ul { list-style: none; padding: 0; margin: 10px 0 0; }
footer li { margin: 6px 0; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--ink); text-decoration: underline; }

/* ---------- type ---------- */
h1, h2, h3 { font-family: var(--sans); font-weight: 700; letter-spacing: -.025em; color: var(--ink); }
h1 { font-size: clamp(38px, 5.4vw, 64px); line-height: 1.02; margin: 0 0 20px; }
h2 { font-size: clamp(28px, 3.4vw, 38px); line-height: 1.12; margin: 0 0 14px; }
h3 { font-size: 19px; line-height: 1.3; margin: 0 0 6px; }
.lead { font-size: clamp(18px, 2vw, 21px); color: var(--ink-2); max-width: 600px; line-height: 1.5; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
section.block { padding-top: 80px; padding-bottom: 80px; }
section.block.tight { padding-top: 56px; padding-bottom: 56px; }
@media (max-width: 700px) { section.block { padding-top: 52px; padding-bottom: 52px; } }
.section-head { max-width: 720px; margin-bottom: 36px; }

/* ---------- buttons & forms ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: 1.5px solid var(--accent); border-radius: 8px; padding: 13px 20px;
  font: 600 16px/1 var(--sans); cursor: pointer; text-decoration: none;
  background: var(--accent); color: #fff; transition: background .15s;
}
.btn:hover { color: #fff; background: var(--accent-dark); border-color: var(--accent-dark); }
.btn.secondary { background: transparent; color: var(--ink); border-color: var(--ink); box-shadow: none; }
.btn.secondary:hover { background: var(--ink); color: var(--paper); }
.btn.dark { background: var(--ink); border-color: var(--ink); }
.btn.small { padding: 8px 13px; font-size: 14px; }
.btn.big { padding: 15px 24px; font-size: 17px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
input[type=text], input[type=url], input[type=email], input[type=number], select {
  font: 16px var(--sans); padding: 13px 15px; border-radius: 12px; border: 1.5px solid var(--line);
  background: var(--card); color: var(--ink); width: 100%; min-width: 0;
}
input:focus, select:focus { outline: 3px solid var(--accent-soft); border-color: var(--accent); }
label { font-weight: 600; font-size: 15px; display: block; margin: 14px 0 6px; }
.notice { border-radius: 12px; padding: 13px 16px; background: var(--ok-soft); color: var(--ok); margin: 16px 0; border: 1px solid rgba(31,107,71,.2); }
.notice.error { background: var(--accent-soft); color: var(--accent-dark); border-color: rgba(184,50,26,.25); }
.trust { font-size: 14.5px; color: var(--muted); margin-top: 16px; }

/* ---------- hero ---------- */
.hero { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; padding: 72px 0 64px; }
.hero .lead { margin: 0 0 30px; }
@media (max-width: 900px) { .hero { grid-template-columns: 1fr; gap: 36px; padding: 40px 0 48px; } }

/* ---------- calculator ---------- */
.calc { display: grid; grid-template-columns: 1fr 1fr; gap: 0; background: var(--card); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.calc .in { padding: 28px; border-right: 1px solid var(--line); }
.calc .out { padding: 28px; display: grid; gap: 16px; align-content: center; }
.calc .line { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font-size: 15.5px; color: var(--ink-2); }
.calc .line b { font: 700 26px/1 var(--sans); }
.calc .line.save b { color: var(--ok); font-size: 32px; }
.calc input[type=range] { width: 100%; accent-color: var(--accent); }
.calc .val { font-family: var(--mono); float: right; color: var(--ink); }
@media (max-width: 760px) { .calc { grid-template-columns: 1fr; } .calc .in { border-right: 0; border-bottom: 1px solid var(--line); } }

/* ---------- pricing receipts ---------- */
.receipts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; align-items: start; }
@media (max-width: 900px) { .receipts { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; } }
.receipt {
  position: relative; background: var(--card); padding: 30px 26px 40px; font-family: var(--mono); font-size: 14px;
  border: 1px solid var(--line); border-radius: 10px;
}
.receipt.featured { background: #fffdf8; outline: 2.5px solid var(--ink); outline-offset: -2.5px; }
.receipt .flag { position: absolute; top: 14px; right: 14px; background: var(--accent); color: #fff; font-size: 11px; letter-spacing: .12em; text-transform: uppercase; padding: 4px 8px; border-radius: 4px; }
.receipt h3 { font-size: 22px; margin: 0; font-family: var(--sans); }
.receipt .sub { color: var(--muted); margin: 2px 0 18px; font: 400 14.5px var(--sans); }
.receipt .l { display: flex; justify-content: space-between; gap: 8px; padding: 5px 0; }
.receipts > * { min-width: 0; }
.receipt .l span:first-child { flex: 1; min-width: 0; overflow: hidden; white-space: nowrap; }
.receipt .l span:first-child::after { content: " ............................................................"; color: var(--line); }
.receipt hr { border: 0; border-top: 1.5px dashed var(--ink); margin: 14px 0; }
.receipt .total { font-size: 15px; font-weight: 500; }
.receipt .total b { font: 700 36px/1 var(--sans); letter-spacing: -.03em; }
.receipt .zero { color: var(--ok); }
.receipt .btn { width: 100%; margin-top: 22px; font-family: var(--sans); }
.receipt .each { color: var(--muted); font: 400 13.5px var(--sans); margin-top: 8px; text-align: center; }

/* ---------- generic cards / tables / faq ---------- */
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 820px) { .grid3 { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3 { margin-top: 0; }
.card.featured { border: 2px solid var(--ink); }
.price { font: 700 36px/1 var(--sans); }
.price small { font: 500 15px var(--mono); color: var(--muted); }
.pill { display: inline-block; font: 500 12px var(--mono); padding: 3px 10px; border-radius: 99px; background: var(--accent-soft); color: var(--accent-dark); letter-spacing: .04em; vertical-align: middle; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
th { font: 600 14px var(--sans); color: var(--ink); background: var(--paper-2); }
td strong { color: var(--ink); }
.faq { max-width: 820px; }
details { border-bottom: 1.5px solid var(--line); padding: 18px 0; }
details:first-of-type { border-top: 1.5px solid var(--line); }
summary { cursor: pointer; font: 600 18px/1.4 var(--sans); list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font: 400 26px/1 var(--sans); color: var(--accent); transition: transform .2s; }
details[open] summary::after { transform: rotate(45deg); }
details p { margin: 10px 0 0; color: var(--ink-2); max-width: 68ch; }
ol.steps { counter-reset: s; list-style: none; padding: 0; }
ol.steps li { counter-increment: s; position: relative; padding-left: 48px; margin: 16px 0; }
ol.steps li::before { content: counter(s); position: absolute; left: 0; top: -2px; width: 32px; height: 32px; border-radius: 50%; border: 1.5px solid var(--ink); font: 600 15px/29px var(--mono); text-align: center; background: var(--card); }

/* ---------- articles (guides) ---------- */
article { padding-bottom: 40px; }
article h1 { font-size: clamp(36px, 5vw, 56px); margin-top: 48px; }
article h2 { font-size: clamp(26px, 3.2vw, 34px); margin: 52px 0 12px; }
article p, article li { max-width: 70ch; }
article .cta-box { margin-top: 48px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 28px; }
article .cta-box h3 { font-size: 22px; }

article .notice { background: var(--card); color: var(--ink); border: 1px solid var(--line); }

/* ---------- dashboard ---------- */
.code-item { display: grid; grid-template-columns: 128px 1fr; gap: 20px; padding: 22px 0; border-bottom: 1.5px dashed var(--line); }
.code-item .qr { background: #fff; padding: 6px; border-radius: 8px; width: 128px; height: 128px; border: 1px solid var(--line); }
.code-item .short { font-family: var(--mono); font-size: 13.5px; }
.code-item strong { font-size: 18px; color: var(--ink); }
@media (max-width: 560px) { .code-item { grid-template-columns: 1fr; } }
.gen-out { display: grid; place-items: center; min-height: 270px; background: var(--paper); border: 1.5px dashed var(--line); border-radius: var(--radius); padding: 18px; }
.gen-out .qr { width: 240px; height: 240px; background: #fff; padding: 10px; border-radius: 10px; }

/* ---------- sticky mobile CTA ---------- */
.sticky-cta { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; display: none; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); background: var(--card); color: var(--ink); border-top: 1px solid var(--line); transform: translateY(110%); transition: transform .2s; }
.sticky-cta.show { transform: none; }
.sticky-cta span { font-size: 15px; line-height: 1.3; color: var(--ink-2); }
.sticky-cta b { color: var(--ink); font-weight: 600; }
.sticky-cta .btn { padding: 11px 18px; flex: none; }
@media (max-width: 760px) { .sticky-cta { display: flex; } }

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

/* ---------- hero demo ---------- */
.try { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px; display: grid; grid-template-columns: 180px 1fr; gap: 22px; align-items: start; }
.try-qr { display: block; width: 180px; height: 180px; background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 4px; }
.try-title { font-size: 20px; margin: 0 0 4px; }
.choices { display: grid; gap: 8px; margin: 14px 0 10px; }
.choice { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); font: 500 15px var(--sans); cursor: pointer; }
.choice:hover { border-color: var(--ink-2); }
.choice .dot { width: 14px; height: 14px; border-radius: 50%; border: 1.5px solid var(--muted); flex: none; }
.choice[aria-pressed="true"] { border-color: var(--ink); background: #fff; }
.choice[aria-pressed="true"] .dot { border-color: var(--accent); background: var(--accent); box-shadow: inset 0 0 0 2.5px #fff; }
.status { font-size: 14px; color: var(--ok); min-height: 20px; margin: 0; }
@media (max-width: 1000px) { .try { grid-template-columns: 1fr; } .try-qr { width: 200px; height: 200px; } }

/* ---------- plain sections ---------- */
section.block { border-top: 1px solid var(--line); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.split p { color: var(--ink-2); }
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 24px; } }
dl.uses { display: grid; grid-template-columns: 1fr 1fr; gap: 0 48px; margin: 0; }
dl.uses > div { padding: 16px 0; border-bottom: 1px solid var(--line); }
dl.uses dt { font-weight: 600; }
dl.uses dd { margin: 2px 0 0; color: var(--ink-2); }
@media (max-width: 700px) { dl.uses { grid-template-columns: 1fr; } }
.promise-list { list-style: none; padding: 0; margin: 0; }
.promise-list li { padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.promise-list li:first-child { padding-top: 0; }
.promise-list strong { color: var(--ink); }
.closing { text-align: left; }
main.narrow h2 { margin-top: 44px; }
.closing .lead { margin-bottom: 22px; }

/* ---------- guide extras ---------- */
.byline { color: var(--muted); font-size: 14.5px; margin: -6px 0 18px; }
.tldr { background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: 8px; padding: 16px 18px; margin: 0 0 24px; font-size: 17px; line-height: 1.55; }
.tldr strong { display: block; font-size: 13px; letter-spacing: .06em; color: var(--accent-dark); margin-bottom: 4px; }
.related ul, .guide-list { list-style: none; padding: 0; margin: 0; }
.related li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.guide-list li { padding: 16px 0; border-bottom: 1px solid var(--line); }
.guide-list li a { font-weight: 600; font-size: 18px; }
.guide-list li p { margin: 4px 0 0; color: var(--ink-2); font-size: 15.5px; }
.author-box { margin-top: 32px; color: var(--ink-2); font-size: 15px; }