/* =========================================================
   QRSmith — design tokens
   ========================================================= */
:root {
  /* color */
  --paper: #F5F6F8;
  --paper-raised: #FFFFFF;
  --ink: #12151C;
  --ink-soft: #5B6270;
  --ink-faint: #8A909C;
  --line: #DEE1E7;
  --line-strong: #C7CBD4;
  --signal: #FF5A1F;
  --signal-deep: #D8480F;
  --signal-tint: #FFF0E8;
  --navy: #1B2A4A;
  --navy-deep: #121D33;
  --navy-tint: #E7EBF3;
  --success: #1E7B4D;
  --danger: #C22F2F;

  /* type */
  --font-display: -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Consolas", "Liberation Mono", monospace;

  /* scale */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(18, 21, 28, 0.06);
  --shadow-md: 0 8px 24px rgba(18, 21, 28, 0.10);
  --shadow-lg: 0 20px 48px rgba(18, 21, 28, 0.16);
  --container: 1180px;
}

/* =========================================================
   Reset
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button { font-family: inherit; }
h1, h2, h3, h4 { font-family: var(--font-display); line-height: 1.15; margin: 0 0 0.5em; letter-spacing: -0.01em; }
p { margin: 0 0 1em; color: var(--ink-soft); }
ul, ol { color: var(--ink-soft); }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

:focus-visible {
  outline: 2.5px solid var(--signal);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 12px 18px;
  z-index: 999;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

/* =========================================================
   Signature motif — QR finder pattern, used as brand mark,
   list bullets and decorative corners throughout the site.
   ========================================================= */
.finder-mark {
  display: inline-block;
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}
.finder-mark svg { width: 100%; height: 100%; display: block; }

.finder-corner {
  position: absolute;
  width: 34px;
  height: 34px;
  opacity: 0.9;
}
.finder-corner.tl { top: -12px; left: -12px; }
.finder-corner.br { bottom: -12px; right: -12px; transform: rotate(180deg); }

/* =========================================================
   Header
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 246, 248, 0.9);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
}
.brand .finder-mark { width: 28px; height: 28px; color: var(--signal); }
.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-left: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.94rem;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background-color 0.15s ease;
}
.main-nav a:hover { color: var(--ink); background: var(--navy-tint); }
.main-nav a[aria-current="page"] {
  color: var(--ink);
  background: #fff;
  box-shadow: var(--shadow-sm);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: #fff;
  cursor: pointer;
}
.nav-toggle svg { width: 20px; height: 20px; }

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    inset: 72px 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    background: #fff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    padding: 8px 16px 16px;
    gap: 2px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.18s ease, opacity 0.18s ease;
  }
  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .main-nav a { padding: 12px 14px; }
  .nav-toggle { display: inline-flex; }
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.98rem;
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.15s ease, color 0.15s ease;
  text-decoration: none;
  line-height: 1;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--signal);
  color: #fff;
  box-shadow: 0 6px 18px rgba(255, 90, 31, 0.32);
}
.btn-primary:hover { background: var(--signal-deep); }
.btn-secondary {
  background: #fff;
  color: var(--ink);
  border: 1.5px solid var(--line-strong);
}
.btn-secondary:hover { border-color: var(--ink); }
.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1.5px solid transparent;
  padding: 14px 18px;
}
.btn-ghost:hover { color: var(--ink); background: var(--navy-tint); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-block { width: 100%; }

/* =========================================================
   Hero / generator layout
   ========================================================= */
.hero {
  position: relative;
  padding: 56px 0 80px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--line-strong) 1px, transparent 1px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 78% 20%, #000 0%, transparent 70%);
  mask-image: radial-gradient(ellipse 70% 60% at 78% 20%, #000 0%, transparent 70%);
  opacity: 0.6;
  pointer-events: none;
}
.hero .container {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: start;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal-deep);
  background: var(--signal-tint);
  padding: 7px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(2.1rem, 4vw, 3.1rem);
  font-weight: 800;
  color: var(--ink);
  max-width: 15ch;
}
.hero-lede {
  font-size: 1.08rem;
  max-width: 46ch;
  margin-bottom: 28px;
}
.trust-line {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--ink-soft);
  max-width: 42ch;
}
.trust-line .finder-mark { color: var(--navy); margin-top: 3px; }

/* generator card */
.generator-card {
  position: relative;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 32px;
}
.generator-card .finder-corner { color: var(--ink); }

.field-label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 8px;
  color: var(--ink);
}
.field-hint {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-faint);
  margin-left: 6px;
  font-weight: 500;
}
.text-input {
  width: 100%;
  border: 1.5px solid var(--line-strong);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-size: 1rem;
  font-family: var(--font-mono);
  color: var(--ink);
  background: #fff;
  resize: vertical;
  min-height: 96px;
  transition: border-color 0.15s ease;
}
.text-input:focus { border-color: var(--signal); }
.text-input.has-error { border-color: var(--danger); }

.field-error {
  display: none;
  align-items: center;
  gap: 6px;
  color: var(--danger);
  font-size: 0.86rem;
  font-weight: 600;
  margin-top: 8px;
}
.field-error.is-visible { display: flex; }

.char-counter {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--ink-faint);
  text-align: right;
  margin-top: 6px;
}
.char-counter.is-near-limit { color: var(--signal-deep); }

.generator-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

.qr-stage {
  margin-top: 26px;
  padding-top: 26px;
  border-top: 1px dashed var(--line);
}
.qr-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}
.qr-canvas-wrap {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 18px;
  box-shadow: var(--shadow-sm);
}
.qr-canvas-wrap canvas {
  width: 200px;
  height: 200px;
  image-rendering: pixelated;
}
.qr-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
}
.qr-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 34px 16px;
  color: var(--ink-faint);
  text-align: center;
}
.qr-empty .finder-mark { width: 40px; height: 40px; opacity: 0.35; }
.qr-empty p { color: var(--ink-faint); margin: 0; font-size: 0.92rem; }

.download-row {
  display: flex;
  gap: 10px;
  width: 100%;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 980px) {
  .hero .container { grid-template-columns: 1fr; gap: 40px; }
  .hero h1 { max-width: none; }
}
@media (max-width: 520px) {
  .generator-card { padding: 22px; }
  .generator-actions { flex-direction: column; }
  .download-row { flex-direction: column; }
}

/* =========================================================
   Steps section
   ========================================================= */
.section {
  padding: 64px 0;
}
.section-head {
  max-width: 60ch;
  margin-bottom: 36px;
}
.section-head h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 26px;
}
.step-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--signal-deep);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  display: block;
}
.step-card h3 { font-size: 1.08rem; margin-bottom: 8px; }
.step-card p { margin: 0; font-size: 0.94rem; }

@media (max-width: 860px) {
  .steps { grid-template-columns: 1fr; }
}

/* feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  padding: 22px;
  border-radius: var(--radius-md);
  background: var(--navy-tint);
}
.feature-card .finder-mark { width: 24px; height: 24px; color: var(--navy); margin-bottom: 12px; }
.feature-card h3 { font-size: 1rem; margin-bottom: 6px; }
.feature-card p { margin: 0; font-size: 0.92rem; }
@media (max-width: 860px) {
  .feature-grid { grid-template-columns: 1fr; }
}

.band {
  background: var(--navy);
  color: #fff;
}
.band p { color: rgba(255,255,255,0.72); }
.band h2 { color: #fff; }

/* =========================================================
   Inner page header (About/Contact/Legal)
   ========================================================= */
.page-header {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--navy-tint), var(--paper) 120%);
}
.page-header h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
  max-width: 22ch;
}
.page-header .lede {
  max-width: 60ch;
  font-size: 1.02rem;
  margin: 0;
}

.prose {
  max-width: 74ch;
}
.prose h2 {
  font-size: 1.3rem;
  margin-top: 2.2em;
}
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { color: var(--ink-soft); }
.prose ul { padding-left: 1.2em; }
.prose li { margin-bottom: 0.5em; }
.prose strong { color: var(--ink); }
.updated-note {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-bottom: 28px;
  display: inline-block;
  background: #fff;
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: 999px;
}

/* about page value grid */
.value-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin: 32px 0 8px;
}
.value-card {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius-md);
  padding: 20px;
}
.value-card h3 { font-size: 1rem; margin-bottom: 6px; }
.value-card p { margin: 0; font-size: 0.92rem; }
@media (max-width: 700px) {
  .value-grid { grid-template-columns: 1fr; }
}

/* contact page */
.contact-card {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
  max-width: 640px;
}
.contact-card .finder-mark { width: 30px; height: 30px; color: var(--signal); flex-shrink: 0; margin-top: 4px; }
.contact-card h2 { margin-bottom: 8px; }
.contact-email {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--navy);
  background: var(--navy-tint);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  margin-top: 6px;
  text-decoration: none;
}
.contact-email:hover { background: var(--signal-tint); color: var(--signal-deep); }
.contact-meta {
  margin-top: 22px;
  font-size: 0.88rem;
  color: var(--ink-faint);
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  background: var(--navy-deep);
  color: rgba(255,255,255,0.7);
  padding: 52px 0 28px;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 10px;
}
.footer-brand .finder-mark { width: 22px; height: 22px; color: var(--signal); }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 14px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a {
  text-decoration: none;
  color: rgba(255,255,255,0.78);
  font-size: 0.92rem;
  transition: color 0.15s ease;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 22px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.5);
  flex-wrap: wrap;
  gap: 10px;
}
.footer-bottom .finder-mark { width: 14px; height: 14px; margin-right: 6px; vertical-align: -2px; }

@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* =========================================================
   Misc 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;
}
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 12px);
  background: var(--ink);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 200;
}
.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}