/* QR Crafter — paper & ink, one accent. No external resources. */

@font-face {
  font-family: "Inter";
  src: url("/fonts/inter-latin-var.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/fonts/jetbrains-mono-latin-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --ink: #1c1c1a;
  --ink-soft: #56554f;
  --line: #dcdad2;
  --accent: #0e7490;
  --accent-ink: #ffffff;
  --warn-bg: #fdf3e0;
  --warn-ink: #7a4a00;
  --warn-line: #eacb8a;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #191a1c;
    --surface: #222325;
    --ink: #ececea;
    --ink-soft: #a5a49e;
    --line: #3a3b3e;
    --accent: #22b8d4;
    --accent-ink: #10222a;
    --warn-bg: #33290f;
    --warn-ink: #ecc880;
    --warn-line: #5c4a1d;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
}

.wrap { max-width: 68rem; margin: 0 auto; padding: 0 1.25rem; }

h1 { font-size: 1.9rem; font-weight: 600; letter-spacing: -0.02em; margin: 0 0 0.25rem; }
h2 { font-size: 1.25rem; font-weight: 600; letter-spacing: -0.01em; margin: 0 0 0.5rem; }
h3 { font-size: 1rem; font-weight: 600; margin: 0; }
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
code { font-family: var(--mono); font-size: 0.9em; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

.skip-link {
  position: absolute; left: 0.5rem; top: -3rem;
  background: var(--accent); color: var(--accent-ink);
  padding: 0.5rem 0.75rem; border-radius: 0 0 6px 6px; z-index: 10;
  transition: top 120ms ease;
}
.skip-link:focus { top: 0; }

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

.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.header-row {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 0.5rem; padding-top: 0.8rem; padding-bottom: 0.8rem;
}
.brand { margin: 0; font-weight: 600; font-size: 1.05rem; display: flex; align-items: center; gap: 0.5rem; }
.brand-mark {
  width: 1.05rem; height: 1.05rem; border-radius: 3px; background: var(--accent);
  box-shadow: inset 0 0 0 2.5px var(--surface), inset 0 0 0 5px var(--accent);
}
.site-header nav { display: flex; gap: 1.1rem; flex-wrap: wrap; }
.site-header nav a { color: var(--ink-soft); text-decoration: none; font-size: 0.95rem; }
.site-header nav a:hover { color: var(--accent); text-decoration: underline; }

.site-footer {
  border-top: 1px solid var(--line); background: var(--surface);
  margin-top: 4rem; padding: 1.5rem 0 2rem;
  color: var(--ink-soft); font-size: 0.9rem;
}
.site-footer nav { display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; margin-bottom: 0.75rem; }
.site-footer p { margin: 0.25rem 0; }

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

main > section { margin-top: 3rem; }
main > section:first-child { margin-top: 2rem; }

.trust-line { color: var(--ink-soft); margin: 0 0 1.5rem; }

.tool-grid { display: grid; grid-template-columns: minmax(0, 1fr) 22rem; gap: 2rem; align-items: start; }
@media (max-width: 56rem) { .tool-grid { grid-template-columns: 1fr; } }

/* ---------- tabs ---------- */

.tabs { display: flex; flex-wrap: wrap; gap: 0.35rem; border-bottom: 1px solid var(--line); padding-bottom: 0.6rem; }
.tabs [role="tab"] {
  font: inherit; font-size: 0.92rem; cursor: pointer;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft);
  padding: 0.35rem 0.8rem; border-radius: 999px;
}
.tabs [role="tab"][aria-selected="true"] {
  background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600;
}
.panels { padding: 1.1rem 0 0.4rem; }

/* ---------- form ---------- */

.field { margin-bottom: 0.9rem; min-width: 0; }
.field label, .field-color label { display: block; font-size: 0.9rem; font-weight: 600; margin-bottom: 0.3rem; }
.optional { font-weight: 400; color: var(--ink-soft); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 0.9rem; }
@media (max-width: 36rem) { .field-row { grid-template-columns: 1fr; } }

input[type="text"], textarea, select, input[type="number"] {
  font: inherit; width: 100%; color: var(--ink);
  background: var(--surface); border: 1px solid var(--line); border-radius: 6px;
  padding: 0.5rem 0.65rem;
}
textarea { resize: vertical; }
input[type="text"]:focus-visible, textarea:focus-visible, select:focus-visible, input[type="number"]:focus-visible {
  outline-offset: 0; border-color: var(--accent);
}

.hint { font-size: 0.85rem; color: var(--ink-soft); margin: 0.3rem 0 0; }

.field-check { display: flex; align-items: center; gap: 0.5rem; margin: 0.5rem 0; }
.field-check label { font-size: 0.92rem; }
input[type="checkbox"] { width: 1.05rem; height: 1.05rem; accent-color: var(--accent); }
input[type="range"] { width: 100%; accent-color: var(--accent); }

fieldset {
  border: 1px solid var(--line); border-radius: 8px;
  padding: 0.8rem 1rem 0.9rem; margin: 0 0 1rem; background: var(--surface);
}
legend { font-size: 0.9rem; font-weight: 600; padding: 0 0.35rem; }

.section-label {
  margin: 1.6rem 0 0.8rem; font-size: 0.85rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-soft);
}

/* ---------- swatches ---------- */

.swatches { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.swatches label { cursor: pointer; text-align: center; }
.swatches input[type="radio"] {
  position: absolute; width: 1px; height: 1px; clip-path: inset(50%); overflow: hidden;
}
.swatch {
  display: grid; place-items: center;
  width: 3.4rem; height: 3.4rem;
  border: 2px solid var(--line); border-radius: 8px; background: var(--surface);
}
.swatch svg { display: block; color: var(--ink); }
.swatches input:checked + .swatch { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.swatches input:checked + .swatch svg { color: var(--accent); }
.swatches input:focus-visible + .swatch { outline: 2px solid var(--accent); outline-offset: 2px; }
.swatch-name { display: block; font-size: 0.72rem; color: var(--ink-soft); margin-top: 0.25rem; max-width: 3.8rem; }

/* ---------- colors / gradient ---------- */

.color-row { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-bottom: 0.4rem; }
.field-color label { font-weight: 400; font-size: 0.82rem; color: var(--ink-soft); }
input[type="color"] {
  width: 3.4rem; height: 2.2rem; padding: 2px;
  border: 1px solid var(--line); border-radius: 6px; background: var(--surface); cursor: pointer;
}
.gradient-controls { align-items: end; }
.gradient-controls .field { margin-bottom: 0; width: 9rem; }

/* ---------- error correction ---------- */

.ec-row { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.ec-row label { cursor: pointer; }
.ec-row input[type="radio"] {
  position: absolute; width: 1px; height: 1px; clip-path: inset(50%); overflow: hidden;
}
.ec-row span {
  display: inline-block; padding: 0.3rem 0.7rem; font-size: 0.88rem;
  border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--ink-soft);
}
.ec-row input:checked + span {
  background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600;
}
.ec-row input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }

.warning {
  background: var(--warn-bg); color: var(--warn-ink);
  border: 1px solid var(--warn-line); border-radius: 6px;
  padding: 0.55rem 0.75rem; font-size: 0.88rem; margin: 0.6rem 0 0;
}

/* ---------- logo / persistence ---------- */

.logo-row { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; }
input[type="file"] { font-size: 0.88rem; max-width: 100%; }

button {
  font: inherit; font-size: 0.92rem; cursor: pointer;
  border: 1px solid var(--line); border-radius: 6px;
  background: var(--surface); color: var(--ink);
  padding: 0.4rem 0.9rem;
}
button:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
button:disabled { opacity: 0.45; cursor: not-allowed; }

.persist-box { border: 1px dashed var(--line); border-radius: 8px; padding: 0.8rem 1rem; margin-top: 1.2rem; }
.persist-box .hint { margin-bottom: 0.6rem; }

/* ---------- preview column ---------- */

.tool-preview { position: sticky; top: 1rem; display: grid; gap: 1rem; }
@media (max-width: 56rem) { .tool-preview { position: static; } }

.preview-card, .payload-card, .export-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 1rem;
}

.qr-canvas { display: grid; place-items: center; }
.qr-canvas canvas, .qr-canvas svg { max-width: 100%; height: auto; border-radius: 4px; }
.qr-empty { text-align: center; padding: 2.5rem 1rem; color: var(--ink-soft); }
.qr-empty p { margin: 0.2rem 0; }
.preview-status { font-size: 0.82rem; color: var(--ink-soft); margin: 0.6rem 0 0; text-align: center; }

.payload-card { border-color: var(--accent); border-width: 2px; }
.payload-head { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; margin-bottom: 0.5rem; }
.payload-head h2, .payload-head h3 { margin: 0; font-size: 0.95rem; }
.payload-pre {
  margin: 0; padding: 0.65rem 0.75rem;
  background: var(--bg); border: 1px solid var(--line); border-radius: 6px;
  overflow-x: auto; max-height: 14rem; overflow-y: auto;
}
.payload-pre code { font-size: 0.83rem; white-space: pre-wrap; word-break: break-all; }

.export-row { display: flex; align-items: end; gap: 0.9rem; flex-wrap: wrap; }
.export-row .field { margin: 0; width: 9rem; }
.export-buttons { display: flex; gap: 0.5rem; }
.export-btn { font-weight: 600; }

/* ---------- decoder ---------- */

.decode-grid { display: grid; gap: 1rem; max-width: 46rem; }
.drop-zone {
  border: 2px dashed var(--line); border-radius: 10px;
  background: var(--surface); color: var(--ink-soft);
  padding: 2.2rem 1.5rem; text-align: center; cursor: pointer;
}
.drop-zone p { margin: 0; }
.drop-zone.dragover { border-color: var(--accent); color: var(--accent); }
.decode-result { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 1rem; }
.type-chip {
  display: inline-block; font-size: 0.75rem; font-weight: 600;
  background: var(--accent); color: var(--accent-ink);
  border-radius: 999px; padding: 0.1rem 0.6rem; margin-left: 0.4rem; vertical-align: middle;
}

/* ---------- verify + prose pages ---------- */

.verify-list li { margin-bottom: 0.7rem; }

.faq { max-width: 46rem; }
.faq h3 { margin-top: 1.4rem; }
.faq p { margin: 0.35rem 0 0; }

.prose { max-width: 46rem; }
.prose h1 { margin-top: 2rem; }
.prose h2 { margin-top: 1.8rem; }
.prose table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: 0.45rem 0.6rem; text-align: left; vertical-align: top; }
.prose th { background: var(--surface); }
.prose pre {
  background: var(--surface); border: 1px solid var(--line); border-radius: 6px;
  padding: 0.75rem; overflow-x: auto; font-family: var(--mono); font-size: 0.83rem;
}
.effective-date { color: var(--ink-soft); font-size: 0.9rem; }