/* QRcrisp — minimalist design system */
:root {
  --ink: #0E1116;
  --ink-2: #3A4049;
  --paper: #FAF8F4;
  --paper-2: #FFFFFF;
  --line: #E6E2DA;
  --accent: #0A5FFF;
  --accent-hover: #0848C7;
  --accent-soft: rgba(10, 95, 255, 0.08);
  --danger: #B91C1C;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(14,17,22,.04), 0 4px 16px rgba(14,17,22,.04);
  --font: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -0.01em; margin: 0 0 0.5em; }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 700; letter-spacing: -0.025em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.125rem); font-weight: 700; }
h3 { font-size: 1.125rem; font-weight: 600; }
p { margin: 0 0 1em; color: var(--ink-2); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--ink-2); }
.small { font-size: 0.875rem; }

.noscript-banner {
  background: var(--danger);
  color: #fff;
  padding: 14px 20px;
  text-align: center;
  font-size: 0.95rem;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  max-width: 1200px;
  margin: 0 auto;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand-mark { width: 28px; height: 28px; fill: var(--ink); }
.site-nav { display: flex; gap: 22px; }
.site-nav a {
  color: var(--ink-2);
  font-weight: 500;
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--ink); text-decoration: none; }

/* Hero */
.hero {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  text-align: center;
}
.hero-sub {
  font-size: 1.125rem;
  max-width: 560px;
  margin: 0 auto;
}

/* App */
.app {
  max-width: 1200px;
  margin: 24px auto 64px;
  padding: 0 24px;
}

.type-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
  padding: 6px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.type-btn {
  background: transparent;
  border: 0;
  padding: 9px 14px;
  font-size: 0.92rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--ink-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .15s, color .15s;
}
.type-btn:hover { background: var(--accent-soft); color: var(--ink); }
.type-btn.active {
  background: var(--accent);
  color: #fff;
}

.app-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 28px;
  align-items: start;
}
@media (max-width: 880px) {
  .app-grid { grid-template-columns: 1fr; }
}

/* Forms */
.form-pane {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.qr-form { display: none; }
.qr-form.active { display: block; }
.qr-form label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-2);
  margin-bottom: 14px;
}
.qr-form label.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink);
}
.qr-form label.checkbox input { width: auto; margin: 0; }
.qr-form input[type=text],
.qr-form input[type=url],
.qr-form input[type=email],
.qr-form input[type=tel],
.qr-form input[type=number],
.qr-form input[type=password],
.qr-form input[type=datetime-local],
.qr-form input[type=file],
.qr-form select,
.qr-form textarea {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 10px 12px;
  font: inherit;
  color: var(--ink);
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition: border-color .15s, box-shadow .15s;
}
.qr-form input:focus,
.qr-form select:focus,
.qr-form textarea:focus {
  outline: 0;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.qr-form textarea { resize: vertical; font-family: inherit; }
.qr-form input[type=color] {
  height: 38px;
  padding: 3px;
  cursor: pointer;
}
.qr-form input[type=range] { padding: 0; cursor: pointer; }
.qr-form .row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.qr-form .row label { margin-bottom: 0; }
.pw-wrap { position: relative; display: block; }
.pw-toggle {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: 0;
  font: inherit;
  font-size: 0.85rem;
  color: var(--accent);
  cursor: pointer;
  padding: 4px 8px;
}
.counter, .hint {
  font-size: 0.8rem;
  color: var(--ink-2);
  margin: 4px 0 0;
}
.counter.warn { color: var(--danger); }

.style-controls {
  margin-top: 24px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}
.style-controls legend {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0 8px;
  color: var(--ink);
}
.style-controls label { margin-bottom: 14px; }
.size-out {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-2);
  margin-left: 8px;
}

/* Preview */
.preview-pane {
  position: sticky;
  top: 24px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}
.qr-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 320px;
  margin-bottom: 18px;
  background: var(--paper);
  border-radius: var(--radius-sm);
  padding: 20px;
}
#qr-canvas { display: inline-block; }
#qr-canvas canvas, #qr-canvas svg {
  max-width: 100%;
  height: auto;
  display: block;
}

.download-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}
.download-row button {
  background: var(--accent);
  color: #fff;
  border: 0;
  padding: 11px 16px;
  font: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .15s, transform .05s;
}
.download-row button:hover { background: var(--accent-hover); }
.download-row button:active { transform: translateY(1px); }
.download-row .ghost-btn {
  background: transparent;
  color: var(--ink-2);
  border: 1px solid var(--line);
}
.download-row .ghost-btn:hover { background: var(--paper); color: var(--ink); }
.ghost-btn {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 9px 14px;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .15s;
}
.ghost-btn:hover { background: var(--accent-soft); }
.ghost-btn.small { padding: 5px 10px; font-size: 0.82rem; margin-top: 6px; }

.test-reminder { margin: 16px 0 0; font-style: italic; }

/* Sections */
.why, .faq {
  max-width: 1000px;
  margin: 72px auto;
  padding: 0 24px;
}
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 28px;
  margin-top: 20px;
}
.why-grid h3 { color: var(--ink); margin-bottom: 8px; }
.faq details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  font-weight: 600;
  cursor: pointer;
  color: var(--ink);
  list-style: none;
  position: relative;
  padding-right: 28px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-size: 1.3rem;
  color: var(--accent);
  font-weight: 300;
}
.faq details[open] summary::after { content: "−"; }
.faq details p { margin-top: 10px; }

/* Footer */
.site-footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 32px;
  text-align: center;
  border-top: 1px solid var(--line);
}
.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 12px;
}
.footer-links a { color: var(--ink-2); font-size: 0.92rem; }
.footer-links a:hover { color: var(--ink); }

/* Article pages */
.article {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 72px;
}
.article h1 { margin-bottom: 16px; }
.article .lede {
  font-size: 1.15rem;
  color: var(--ink-2);
  margin-bottom: 32px;
}
.article h2 { margin-top: 48px; }
.article h3 { margin-top: 32px; }
.article p, .article li { font-size: 1.02rem; color: var(--ink); }
.article ul, .article ol { padding-left: 24px; margin-bottom: 1em; }
.article li { margin-bottom: 6px; }
.article blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 18px;
  margin: 1.5em 0;
  color: var(--ink-2);
  font-style: italic;
}
.article .cta-box {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  margin: 32px 0;
}
.article .cta-box p { margin: 0; color: var(--ink); }
.article .cta-box a { font-weight: 600; }
.article time { color: var(--ink-2); font-size: 0.9rem; }