/* ============================================
   QRSMITH — design tokens
   ============================================ */
:root {
  --color-bg: #F6F7F5;
  --color-surface: #FFFFFF;
  --color-ink: #12141C;
  --color-ink-soft: #565B6B;
  --color-ink-faint: #9195A3;
  --color-accent: #3654FF;
  --color-accent-ink: #1F2FB8;
  --color-signal: #C6FF3D;
  --color-border: #E3E5E0;
  --color-ad-bg: #EEF0EC;
  --color-warn: #B45309;
  --color-warn-bg: #FEF3E2;

  --font-display: 'Space Grotesk', ui-sans-serif, system-ui, sans-serif;
  --font-body: 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --wrap-max: 1100px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

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

/* subtle paper texture, ties the "print" theme together without being loud */
.noise-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.035;
  background-image: radial-gradient(circle, var(--color-ink) 1px, transparent 1px);
  background-size: 3px 3px;
}

a { color: inherit; }

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

/* ============================================
   Topbar
   ============================================ */
.topbar {
  padding: 22px 0;
  position: relative;
  z-index: 1;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.mark-glyph {
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 2px;
  width: 16px;
  height: 16px;
}
.mark-glyph span { background: var(--color-ink); border-radius: 1px; }
.mark-glyph span:nth-child(2) { background: var(--color-accent); }
.topbar-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ink-soft);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  padding: 28px 24px 8px;
  position: relative;
  z-index: 1;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--color-accent-ink);
  margin: 0 0 14px;
}
h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 5.4vw, 3.6rem);
  line-height: 1.03;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
  max-width: 14ch;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--color-ink-soft);
  max-width: 46ch;
  margin: 0;
}

/* ============================================
   Studio (the actual tool)
   ============================================ */
.studio {
  padding: 36px 24px 0;
  position: relative;
  z-index: 1;
}
.studio-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 20px;
  align-items: stretch;
}
@media (max-width: 860px) {
  .studio-grid { grid-template-columns: 1fr; }
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 26px;
}

.field-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin-bottom: 8px;
}

.text-input {
  width: 100%;
  resize: vertical;
  min-height: 96px;
  padding: 14px 16px;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-ink);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease;
}
.text-input:focus {
  border-color: var(--color-accent);
  outline: none;
}
.hint {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-ink-faint);
}

.controls-row {
  display: flex;
  gap: 16px;
  margin-top: 22px;
  flex-wrap: wrap;
}
.control { flex: 1 1 140px; }
.control-wide { flex: 1 1 100%; }

.swatch-input {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  background: var(--color-bg);
}
.swatch-input input[type="color"] {
  width: 28px;
  height: 28px;
  border: none;
  padding: 0;
  background: none;
  cursor: pointer;
  border-radius: 6px;
  overflow: hidden;
}
.swatch-value {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-ink-soft);
}

.select-input {
  width: 100%;
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  color: var(--color-ink);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.contrast-warning {
  margin: 18px 0 0;
  font-size: 0.82rem;
  color: var(--color-warn);
  background: var(--color-warn-bg);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
}

/* ============================================
   Preview / "scan target" — signature element
   ============================================ */
.preview-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.scan-target {
  position: relative;
  width: min(320px, 100%);
  aspect-ratio: 1 / 1;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#qr-canvas {
  width: 88%;
  height: 88%;
  border-radius: 4px;
}

.corner {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 3px solid var(--color-signal);
  z-index: 2;
}
.corner-tl { top: 10px; left: 10px; border-right: none; border-bottom: none; border-radius: 6px 0 0 0; }
.corner-tr { top: 10px; right: 10px; border-left: none; border-bottom: none; border-radius: 0 6px 0 0; }
.corner-bl { bottom: 10px; left: 10px; border-right: none; border-top: none; border-radius: 0 0 0 6px; }
.corner-br { bottom: 10px; right: 10px; border-left: none; border-top: none; border-radius: 0 0 6px 0; }

.scan-line {
  position: absolute;
  left: 8%;
  right: 8%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-signal), transparent);
  top: 6%;
  opacity: 0;
  z-index: 3;
  pointer-events: none;
}
.scan-line.is-active {
  animation: sweep 0.7s ease-out;
}
@keyframes sweep {
  0%   { top: 6%; opacity: 0; }
  15%  { opacity: 1; }
  85%  { opacity: 1; }
  100% { top: 92%; opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .scan-line.is-active { animation: none; }
}

.empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--color-ink-faint);
  text-align: center;
  padding: 20px;
}
.empty-glyph {
  display: grid;
  grid-template-columns: repeat(3, 10px);
  grid-template-rows: repeat(3, 10px);
  gap: 3px;
}
.empty-glyph span { background: var(--color-border); border-radius: 1px; }
.empty-glyph span:nth-child(1),
.empty-glyph span:nth-child(3),
.empty-glyph span:nth-child(7) { background: var(--color-ink-faint); }
.empty-state p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.preview-caption {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ink-faint);
  text-align: center;
  min-height: 1.2em;
}

/* ============================================
   Downloads
   ============================================ */
.download-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 20px;
}
.btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  transition: transform 0.12s ease, background 0.15s ease, opacity 0.15s ease;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--color-ink);
  color: var(--color-surface);
}
.btn-primary:hover:not(:disabled) { background: var(--color-accent-ink); }
.btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}
.btn-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
}
.btn-sub {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.65);
}

@media (max-width: 560px) {
  .download-row { grid-template-columns: 1fr; }
}

/* ============================================
   Ad zone — fixed dimensions, zero CLS
   Sits directly below the download buttons.
   ============================================ */
.ad-zone {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.ad-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-faint);
}
.ad-slot {
  width: 100%;
  max-width: 728px;
  background: var(--color-ad-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;

  /* mobile default: reserve 320x50 */
  height: 50px;
}
.ad-placeholder-text {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-ink-faint);
}

/* tablet: reserve 300x250 style block */
@media (min-width: 480px) and (max-width: 767px) {
  .ad-slot { height: 250px; max-width: 300px; }
}

/* desktop: reserve 728x90 leaderboard */
@media (min-width: 768px) {
  .ad-slot { height: 90px; max-width: 728px; }
}

/* ============================================
   Trust strip
   ============================================ */
.trust {
  padding: 56px 24px 40px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  position: relative;
  z-index: 1;
}
@media (max-width: 768px) {
  .trust { grid-template-columns: 1fr; gap: 20px; }
}
.trust-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.trust-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-accent-ink);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 2px 6px;
  flex-shrink: 0;
}
.trust-item p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--color-ink-soft);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 22px 0 40px;
  position: relative;
  z-index: 1;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-inner p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--color-ink-faint);
}
.footer-mono {
  font-family: var(--font-mono);
}