/* =========================================================================
   QuickMark — main.css
   Design language: "signal & grid" — a QR code is a grid that carries a
   signal. The signature motif is a thin animated scan-line that sweeps
   across the hero module and doubles as a section divider elsewhere,
   replacing generic numbered markers with something that actually means
   something for this subject.

   Type stack is system-font only (no external font requests) — this is a
   deliberate Core Web Vitals decision: zero render-blocking font fetches,
   zero CLS from font swap, faster LCP on 3G. Weight/tracking are tuned so
   the system stack still reads as an intentional display face.
   ========================================================================= */

:root {
  /* Color tokens */
  --ink: #12151c;
  --ink-soft: #3a3f4b;
  --paper: #faf9f6;
  --surface: #ffffff;
  --line: #e4e2dc;
  --line-strong: #cfccc3;
  --scan: #00b389;        /* signature teal — "scan" accent */
  --scan-dim: #017a5e;
  --scan-tint: #e3f7f1;
  --signal: #e8542f;      /* sparing use — CTA / alert accent */
  --signal-tint: #fdeae3;
  --muted: #676c78;

  /* Type */
  --font-display: "Space Grotesk", ui-sans-serif, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font-body: "Inter", ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", monospace;

  /* Scale */
  --step-0: clamp(1rem, 0.95rem + 0.2vw, 1.05rem);
  --step-1: clamp(1.2rem, 1.1rem + 0.5vw, 1.4rem);
  --step-2: clamp(1.5rem, 1.3rem + 1vw, 1.9rem);
  --step-3: clamp(2rem, 1.6rem + 1.8vw, 2.8rem);
  --step-4: clamp(2.6rem, 2rem + 3vw, 4rem);

  --radius: 10px;
  --radius-lg: 18px;
  --container: 1180px;
  --shadow: 0 1px 2px rgba(18,21,28,.04), 0 8px 24px rgba(18,21,28,.06);
}

/* Respect reduced motion globally */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}
img, svg, canvas { max-width: 100%; height: auto; display: block; }
a { color: var(--scan-dim); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--scan);
  outline-offset: 2px;
  border-radius: 4px;
}
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 .5em; color: var(--ink); }
h1 { font-size: var(--step-4); }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); }
p { margin: 0 0 1.1em; }
code, kbd, samp { font-family: var(--font-mono); font-size: .92em; background: var(--scan-tint); padding: .1em .4em; border-radius: 4px; }
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--ink); color: #fff;
  padding: .8em 1.2em; z-index: 10000; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.container { max-width: var(--container); margin-inline: auto; padding-inline: 1.25rem; }
.container--narrow { max-width: 820px; }
.section { padding-block: clamp(3rem, 6vw, 6rem); }
.section--tight { padding-block: clamp(2rem, 4vw, 3.5rem); }
.section-alt { background: var(--surface); border-block: 1px solid var(--line); }

.eyebrow {
  display: inline-flex; align-items: center; gap: .5em;
  font-family: var(--font-mono); font-size: .78rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--scan-dim); margin-bottom: .9em;
}
.eyebrow::before { content: ""; width: 18px; height: 2px; background: var(--scan); display: inline-block; }

/* Signature scan-line divider — used instead of numbered markers */
.scan-divider { position: relative; height: 2px; background: var(--line); margin-block: clamp(2.5rem, 5vw, 4rem); overflow: hidden; }
.scan-divider::after {
  content: ""; position: absolute; top: 0; left: -20%; width: 20%; height: 100%;
  background: linear-gradient(90deg, transparent, var(--scan), transparent);
  animation: scan-sweep 3.2s ease-in-out infinite;
}
@keyframes scan-sweep { 0% { left: -20%; } 50% { left: 100%; } 100% { left: -20%; } }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  font-family: var(--font-body); font-weight: 600; font-size: .98rem;
  padding: .85em 1.5em; border-radius: var(--radius); border: 1.5px solid transparent;
  cursor: pointer; text-decoration: none; transition: transform .12s ease, background .15s ease, border-color .15s ease;
  line-height: 1.2;
}
.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--scan-dim); color: #fff; }
.btn-accent { background: var(--scan); color: var(--ink); }
.btn-accent:hover { background: #00c896; color: var(--ink); }
.btn-ghost { background: transparent; border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 500; background: rgba(250,249,246,.92); backdrop-filter: saturate(140%) blur(8px); border-bottom: 1px solid var(--line); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: .8rem; }
.site-logo { display: flex; align-items: center; gap: .55rem; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; color: var(--ink); text-decoration: none; }
.site-logo:hover { color: var(--ink); }
.site-logo__mark { width: 30px; height: 30px; flex: none; }
.primary-nav { display: none; }
.primary-nav ul { list-style: none; display: flex; gap: 1.6rem; margin: 0; padding: 0; }
.primary-nav a { color: var(--ink-soft); font-weight: 500; text-decoration: none; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--ink); }
.header-cta { display: none; }
.nav-toggle { display: inline-flex; align-items: center; justify-content: center; width: 42px; height: 42px; border-radius: 8px; border: 1.5px solid var(--line-strong); background: var(--surface); }
.mobile-nav { display: none; border-top: 1px solid var(--line); background: var(--surface); }
.mobile-nav.is-open { display: block; }
.mobile-nav ul { list-style: none; margin: 0; padding: .5rem 1.25rem 1.25rem; }
.mobile-nav li { border-bottom: 1px solid var(--line); }
.mobile-nav a { display: block; padding: .8rem 0; color: var(--ink); text-decoration: none; font-weight: 500; }

@media (min-width: 900px) {
  .primary-nav { display: block; }
  .header-cta { display: inline-flex; }
  .nav-toggle { display: none; }
}

/* Hero */
.hero { padding-block: clamp(2.5rem, 7vw, 5.5rem); position: relative; overflow: hidden; }
.hero__grid { display: grid; gap: clamp(2rem, 5vw, 3rem); align-items: center; }
.hero h1 { margin-bottom: .4em; }
.hero__lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 46ch; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.6rem; }
.hero__trust { display: flex; flex-wrap: wrap; gap: 1.2rem; margin-top: 2rem; font-family: var(--font-mono); font-size: .82rem; color: var(--muted); }
.hero__trust span { display: inline-flex; align-items: center; gap: .4em; }
@media (min-width: 980px) { .hero__grid { grid-template-columns: 1.05fr .95fr; } }

/* QR generator panel */
.qr-app {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); padding: clamp(1.25rem, 3vw, 2rem); position: relative;
}
.qr-app__tabs { display: flex; gap: .4rem; margin-bottom: 1.1rem; flex-wrap: wrap; }
.qr-app__tab { font-family: var(--font-mono); font-size: .8rem; padding: .5em 1em; border-radius: 999px; border: 1.5px solid var(--line-strong); background: transparent; cursor: pointer; color: var(--ink-soft); }
.qr-app__tab[aria-selected="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }
.qr-field { margin-bottom: 1rem; }
.qr-field label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: .4rem; }
.qr-field .hint { font-size: .8rem; color: var(--muted); margin-top: .3rem; }
.qr-field input[type="text"], .qr-field input[type="url"], .qr-field input[type="email"], .qr-field input[type="tel"], .qr-field textarea, .qr-field select {
  width: 100%; padding: .75em .9em; border: 1.5px solid var(--line-strong); border-radius: 8px; font: inherit; background: #fff; color: var(--ink);
}
.qr-field input:focus, .qr-field textarea:focus, .qr-field select:focus { border-color: var(--scan); }
.qr-app__options { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: .9rem; margin-bottom: 1rem; }
.qr-app__preview {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border: 1.5px dashed var(--line-strong); border-radius: var(--radius); padding: 1.5rem; margin-top: 1.2rem; background: var(--paper); position: relative; overflow: hidden;
}
.qr-app__preview canvas { image-rendering: pixelateD; border-radius: 6px; background: #fff; }
.qr-app__preview.is-scanning::after {
  content: ""; position: absolute; left: 0; top: -10%; width: 100%; height: 30%;
  background: linear-gradient(180deg, transparent, rgba(0,179,137,.35), transparent);
  animation: scan-vertical 1.1s ease-in-out infinite;
}
@keyframes scan-vertical { 0% { top: -30%; } 100% { top: 100%; } }
.qr-app__downloads { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.1rem; justify-content: center; }
.qr-app__status { font-size: .85rem; color: var(--muted); margin-top: .6rem; min-height: 1.2em; }
.qr-app__status[data-state="error"] { color: var(--signal); }
.qr-app__status[data-state="ok"] { color: var(--scan-dim); }

/* Feature grid */
.feature-grid { display: grid; gap: 1.5rem; grid-template-columns: 1fr; }
@media (min-width: 700px) { .feature-grid { grid-template-columns: repeat(3, 1fr); } }
.feature-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.6rem; }
.feature-card__icon { width: 40px; height: 40px; margin-bottom: 1rem; color: var(--scan-dim); }
.feature-card h3 { font-size: 1.15rem; margin-bottom: .4em; }
.feature-card p { color: var(--ink-soft); margin: 0; font-size: .95rem; }

/* Cards / posts */
.post-grid { display: grid; gap: 1.75rem; grid-template-columns: 1fr; }
@media (min-width: 700px) { .post-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .post-grid { grid-template-columns: repeat(3, 1fr); } }
.post-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.post-card__media { aspect-ratio: 16/9; background: var(--scan-tint); }
.post-card__media img { width: 100%; height: 100%; object-fit: cover; }
.post-card__body { padding: 1.25rem; display: flex; flex-direction: column; gap: .5rem; flex: 1; }
.post-card__meta { font-family: var(--font-mono); font-size: .75rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.post-card h3 { font-size: 1.1rem; margin: 0; }
.post-card h3 a { color: var(--ink); text-decoration: none; }
.post-card h3 a:hover { color: var(--scan-dim); }
.post-card p { color: var(--ink-soft); font-size: .92rem; margin: 0; }
.post-card__link { margin-top: auto; font-weight: 600; font-size: .88rem; }

/* Content / article */
.entry-header { padding-block: 2rem 1rem; }
.entry-header .eyebrow { }
.entry-meta { font-family: var(--font-mono); font-size: .82rem; color: var(--muted); display: flex; gap: 1rem; flex-wrap: wrap; }
.entry-content { max-width: 72ch; }
.entry-content h2 { margin-top: 1.8em; }
.entry-content h3 { margin-top: 1.4em; }
.entry-content ul, .entry-content ol { padding-left: 1.3em; }
.entry-content li { margin-bottom: .4em; }
.entry-content blockquote { border-left: 3px solid var(--scan); margin: 1.5em 0; padding: .2em 1.2em; color: var(--ink-soft); font-style: italic; }
.entry-content figure { margin: 1.6em 0; }
.entry-content figcaption { font-size: .85rem; color: var(--muted); margin-top: .5em; }
.entry-cta { background: var(--scan-tint); border: 1px solid var(--scan); border-radius: var(--radius); padding: 1.5rem; margin: 2.2rem 0; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; }

/* Breadcrumbs */
.breadcrumbs { font-family: var(--font-mono); font-size: .78rem; color: var(--muted); padding-block: 1rem; }
.breadcrumbs a { color: var(--muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--scan-dim); }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: .4rem; margin: 0; padding: 0; }
.breadcrumbs li:not(:last-child)::after { content: "/"; margin-left: .4rem; color: var(--line-strong); }

/* FAQ */
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { cursor: pointer; padding: 1.1rem 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 1rem; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-family: var(--font-mono); color: var(--scan-dim); font-size: 1.3rem; flex: none; }
.faq-item[open] summary::after { content: "–"; }
.faq-item .faq-answer { padding-bottom: 1.1rem; color: var(--ink-soft); }

/* Forms (contact) */
.form-grid { display: grid; gap: 1.1rem; }
@media (min-width: 640px) { .form-grid--2col { grid-template-columns: 1fr 1fr; } }
.form-row { display: flex; flex-direction: column; gap: .4rem; }
.form-row label { font-weight: 600; font-size: .92rem; }
.form-row input, .form-row textarea, .form-row select { padding: .8em .95em; border: 1.5px solid var(--line-strong); border-radius: 8px; font: inherit; }
.form-row input:focus, .form-row textarea:focus { border-color: var(--scan); }
.form-note { font-size: .8rem; color: var(--muted); }
.form-honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-message { padding: 1rem 1.2rem; border-radius: 8px; margin-bottom: 1.2rem; font-size: .92rem; }
.form-message--success { background: var(--scan-tint); color: var(--scan-dim); border: 1px solid var(--scan); }
.form-message--error { background: var(--signal-tint); color: var(--signal); border: 1px solid var(--signal); }

/* Trust bar */
.trust-bar { display: flex; flex-wrap: wrap; gap: 2rem; justify-content: center; align-items: center; padding-block: 1.6rem; color: var(--muted); font-family: var(--font-mono); font-size: .8rem; }

/* Sidebar / widgets */
.widget { margin-bottom: 2rem; }
.widget h2, .widget h3 { font-size: 1.05rem; }
.widget ul { list-style: none; margin: 0; padding: 0; }
.widget li { padding-block: .4rem; border-bottom: 1px solid var(--line); }

/* Footer */
.site-footer { background: var(--ink); color: #cfd2da; margin-top: 4rem; }
.site-footer a { color: #eef0f3; }
.footer-grid { display: grid; gap: 2rem; grid-template-columns: 1fr; padding-block: 3rem 2rem; }
@media (min-width: 780px) { .footer-grid { grid-template-columns: 1.4fr repeat(3, 1fr); } }
.footer-grid h2 { color: #fff; font-size: .95rem; text-transform: uppercase; letter-spacing: .06em; font-family: var(--font-mono); font-weight: 600; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .55rem; }
.footer-grid a { text-decoration: none; opacity: .85; }
.footer-grid a:hover { opacity: 1; color: var(--scan); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding-block: 1.2rem; display: flex; flex-wrap: wrap; gap: .8rem; justify-content: space-between; font-size: .82rem; color: #a7abb6; }

/* Utility */
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.stack { display: flex; flex-direction: column; gap: 1rem; }
.pagination { display: flex; gap: .5rem; justify-content: center; margin-top: 2.5rem; flex-wrap: wrap; }
.pagination a, .pagination span { padding: .6em 1em; border: 1.5px solid var(--line-strong); border-radius: 8px; font-family: var(--font-mono); font-size: .85rem; text-decoration: none; color: var(--ink); }
.pagination .current { background: var(--ink); color: #fff; border-color: var(--ink); }
.error-page { text-align: center; padding-block: 5rem; }
.error-page__code { font-family: var(--font-mono); font-size: 5rem; color: var(--scan); line-height: 1; }