/* ============================================================
   QR Generator — Landing page stylesheet
   Standalone: does not depend on Vite, Tailwind, or the SPA.
   Tokens inlined from letzapps-brand.css + qrgen-brand.css.
   ============================================================ */

/* ── §1  Brand tokens (from letzapps-brand.css §1) ────────── */
:root {
  --color-charge:   #00D4FF;
  --color-abyss:    #0A0A0A;
  --color-deep:     #0D2A30;
  --color-mist:     #E0FAFE;
  --color-cloud:    #F5F5F5;
  --color-white:    #FFFFFF;
  --color-slate:    #E2E8F0;
  --color-smoke:    #888888;

  --font-primary:   'Inter', 'Arial Black', Arial, sans-serif;

  --radius-sm:      6px;
  --radius-md:      8px;
  --radius-full:    9999px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  --app-max-width:  1366px;
}

/* ── §2  QRGen app-level tokens (from qrgen-brand.css §1–§2) ─ */
:root {
  --qrgen-mark-dark: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 34 34'><path d='M5 11 L5 5 L11 5' stroke='%2300D4FF' stroke-width='2' fill='none' stroke-linecap='round'/><path d='M23 5 L29 5 L29 11' stroke='%2300D4FF' stroke-width='2' fill='none' stroke-linecap='round'/><path d='M5 23 L5 29 L11 29' stroke='%2300D4FF' stroke-width='2' fill='none' stroke-linecap='round'/><path d='M23 29 L29 29 L29 23' stroke='%2300D4FF' stroke-width='2' fill='none' stroke-linecap='round'/><circle cx='17' cy='17' r='4' fill='%2300D4FF'/></svg>");

  --qrgen-spinner-corners: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 34 34'><path d='M5 11 L5 5 L11 5' stroke='%2300D4FF' stroke-width='2.4' fill='none' stroke-linecap='round'/><path d='M23 5 L29 5 L29 11' stroke='%2300D4FF' stroke-width='2.4' fill='none' stroke-linecap='round'/><path d='M5 23 L5 29 L11 29' stroke='%2300D4FF' stroke-width='2.4' fill='none' stroke-linecap='round'/><path d='M23 29 L29 29 L29 23' stroke='%2300D4FF' stroke-width='2.4' fill='none' stroke-linecap='round'/></svg>");

  --qrgen-app-bg:      var(--color-cloud);
  --qrgen-header-bg:   var(--color-abyss);
  --qrgen-header-ink:  #FFFFFF;

  --bg-card:        var(--color-white);
  --bg-card-muted:  #F9FAFB;
  --ink:            var(--color-abyss);
  --ink-muted:      #4B5563;
  --ink-subtle:     var(--color-smoke);
  --ink-on-accent:  var(--color-abyss);
  --border:         var(--color-slate);
  --border-strong:  #CBD5E1;
  --focus-ring:     rgba(0, 212, 255, 0.55);
  --hover-tint:     rgba(0, 212, 255, 0.08);
  --shadow-sm:      0 1px 2px rgba(10, 10, 10, 0.04);
  --shadow-md:      0 4px 12px rgba(10, 10, 10, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --qrgen-app-bg:      var(--color-deep);
    --qrgen-header-bg:   var(--color-abyss);
    --qrgen-header-ink:  var(--color-mist);
    --bg-card:           #112E34;
    --bg-card-muted:     #0F262B;
    --ink:               var(--color-mist);
    --ink-muted:         #A7CDD4;
    --ink-subtle:        #6F8E94;
    --ink-on-accent:     var(--color-abyss);
    --border:            rgba(224, 250, 254, 0.12);
    --border-strong:     rgba(224, 250, 254, 0.22);
    --focus-ring:        rgba(0, 212, 255, 0.65);
    --hover-tint:        rgba(0, 212, 255, 0.14);
    --shadow-sm:         0 1px 2px rgba(0, 0, 0, 0.32);
    --shadow-md:         0 6px 16px rgba(0, 0, 0, 0.36);
  }
}


/* ── §3  Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--qrgen-app-bg);
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }


/* ── §4  Duotone wordmark ──────────────────────────────────── */
.wordmark {
  display: inline-flex;
  align-items: stretch;
  line-height: 1.1;
  font-size: 0.9375rem;
}

.wordmark__letz {
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--color-abyss);
  background: var(--color-charge);
  padding: 3px 10px;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.wordmark__apps {
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--color-charge);
  background: var(--color-abyss);
  padding: 3px 10px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.wordmark--sm .wordmark__letz,
.wordmark--sm .wordmark__apps {
  font-size: 0.75rem;
  padding: 2px 7px;
}


/* ── §5  Mark ──────────────────────────────────────────────── */
.qrgen-mark {
  display: inline-block;
  width: 32px;
  height: 32px;
  background-image: var(--qrgen-mark-dark);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  vertical-align: middle;
  flex-shrink: 0;
}


/* ── §6  Pill ──────────────────────────────────────────────── */
.qrgen-pill {
  display: inline-block;
  background: rgba(0, 212, 255, 0.12);
  color: var(--color-charge);
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}


/* ── §7  Header cluster ────────────────────────────────────── */
.qrgen-header-cluster {
  display: flex;
  align-items: center;
  gap: 16px;
}

.qrgen-header-divider {
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.18);
  margin: 0 4px;
  flex-shrink: 0;
}


/* ── §8  App header ────────────────────────────────────────── */
.qrgen-app-header {
  background: var(--qrgen-header-bg);
  color: var(--qrgen-header-ink);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 20;
}

.landing-cta-bar {
  background: var(--qrgen-header-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 10px 24px;
  display: flex;
  justify-content: center;
  position: sticky;
  top: 64px;
  z-index: 19;
}


/* ── §9  Buttons ───────────────────────────────────────────── */
.qrgen-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  line-height: 1;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.qrgen-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.qrgen-btn--sm { height: 36px; padding: 0 14px; font-size: 0.875rem; border-radius: 8px; }

.qrgen-btn--primary {
  background: var(--color-charge);
  color: var(--ink-on-accent);
  border-color: var(--color-charge);
}

.qrgen-btn--primary:hover {
  background: #1AE0FF;
  border-color: #1AE0FF;
}

.qrgen-btn--outline {
  background: transparent;
  color: var(--ink);
  border-color: var(--border-strong);
}

.qrgen-btn--outline:hover {
  background: var(--hover-tint);
  border-color: var(--color-charge);
  color: var(--color-charge);
}

.qrgen-btn--ghost {
  background: transparent;
  color: var(--ink-muted);
  border-color: transparent;
}

.qrgen-btn--ghost:hover {
  background: var(--hover-tint);
  color: var(--ink);
  border-color: transparent;
}


/* ── §10  Skip link (a11y) ─────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-link:focus {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 100;
  width: auto;
  height: auto;
  clip: auto;
  clip-path: none;
  overflow: visible;
  white-space: normal;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-weight: 600;
  background: var(--color-charge);
  color: var(--color-abyss);
}


/* ── §11  Cards ────────────────────────────────────────────── */
.qrgen-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.qrgen-card--lifted  { box-shadow: var(--shadow-md); }
.qrgen-card--muted   { background: var(--bg-card-muted); }


/* ── §12  Tier badges ──────────────────────────────────────── */
.qrgen-tier-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
}

.qrgen-tier-badge--pro {
  background: rgba(0, 212, 255, 0.12);
  color: var(--color-charge);
}


/* ── §13  Spinner — viewfinder corners orbiting the cyan dot ─ */
@keyframes qrgen-spinner-rotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes qrgen-spinner-pulse {
  0%, 100% { opacity: 1;    transform: scale(1); }
  50%       { opacity: 0.55; transform: scale(0.82); }
}

.qrgen-spinner {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 40px;
}

.qrgen-spinner__corners {
  position: absolute;
  inset: 0;
  background-image: var(--qrgen-spinner-corners);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  animation: qrgen-spinner-rotate 1.2s linear infinite;
  transform-origin: 50% 50%;
  will-change: transform;
}

.qrgen-spinner__dot {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.qrgen-spinner__dot::after {
  content: "";
  width: 22%;
  height: 22%;
  background: var(--color-charge);
  border-radius: 50%;
  animation: qrgen-spinner-pulse 1.2s ease-in-out infinite;
  will-change: transform, opacity;
}

.qrgen-spinner--sm { width: 24px; height: 24px; }
.qrgen-spinner--md { width: 40px; height: 40px; }

@media (prefers-reduced-motion: reduce) {
  .qrgen-spinner__corners  { animation: none; }
  .qrgen-spinner__dot::after { animation: none; }
}


/* ── §14  Landing layout ───────────────────────────────────── */
.landing-main {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

.landing-section {
  width: 100%;
  max-width: var(--app-max-width);
  margin-left: auto;
  margin-right: auto;
  padding: 4rem 1.5rem;
}

.landing-section__heading {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 0.25rem;
}

.landing-section__heading--flush { margin-bottom: 0; }


/* ── §15  Hero block (#58) + How-it-works (#60) ───────────── */
.landing-section--hero {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 3.5rem;
  padding-top: 5rem;
  padding-bottom: 5rem;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.125rem;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink-muted);
}

.landing-hero__title {
  font-size: clamp(1.75rem, 3.5vw, 2.625rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--ink);
  max-width: 22ch;
}

.landing-hero__sub {
  font-size: 1.0625rem;
  color: var(--ink-muted);
  max-width: 44ch;
}

.hero-ctas {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.375rem;
}

/* ── QR preview card ── */
.qrgen-preview-card {
  width: 230px;
  height: 230px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}

.preview-spinner-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-qr-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-qr-wrap canvas {
  border-radius: 10px;
  display: block;
}

.hiw-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: nowrap;
  margin-top: 2.5rem;
}

.hiw-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.625rem;
  max-width: 140px;
}

.hiw-step__num {
  font-size: 2.25rem;
  line-height: 1;
  color: var(--color-charge);
  font-weight: 700;
}

.hiw-step__body {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.4;
}

.hiw-connector { flex-shrink: 0; }

@media (max-width: 600px) {
  .hiw-steps {
    flex-direction: column;
    gap: 1.5rem;
  }

  .hiw-step {
    max-width: none;
    flex-direction: row;
    text-align: left;
    gap: 1rem;
  }

  .hiw-step__num { font-size: 1.75rem; }
}


/* ── §16  Pro teaser block (#61) ───────────────────────────── */
.landing-pro-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px;
}

.landing-pro-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
}

.landing-compare-wrap {
  overflow-x: auto;
}

.landing-compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.landing-compare-table th,
.landing-compare-table td {
  padding: 0.625rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.landing-compare-table tbody tr:last-child td {
  border-bottom: none;
}

.landing-compare-table th {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
  padding-top: 0;
  padding-bottom: 0.75rem;
}

.landing-compare-table td:first-child {
  color: var(--ink-muted);
}

.landing-compare-table td:last-child {
  color: var(--ink);
  font-weight: 500;
}

.landing-pro-cta {
  margin-top: 1.75rem;
}

@media (max-width: 480px) {
  .landing-pro-card { padding: 20px 16px; }

  .landing-compare-table th,
  .landing-compare-table td {
    padding: 0.5rem 0.5rem;
    font-size: 0.875rem;
  }
}


/* ── §17  LetzAds slot placeholder (#64) ──────────────────── */
.landing-ads-slot {
  max-width: var(--app-max-width);
  margin: 0 auto 0;
  width: calc(100% - 3rem);
}

.landing-ads-label {
  font-size: 0.75rem;
  color: var(--ink-subtle);
  letter-spacing: 0.04em;
}


/* ── §18  Footer (#62) ─────────────────────────────────────── */
.landing-footer {
  background: var(--qrgen-header-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 2rem 1.5rem;
  margin-top: 2rem;
}

.landing-footer-inner {
  max-width: var(--app-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.landing-footer__brand a {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.landing-footer__brand a:hover { opacity: 1; }

.landing-footer__legal {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
}

.landing-footer__legal a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.landing-footer__legal a:hover { color: var(--color-charge); }

.landing-footer__lang {
  display: flex;
  align-items: center;
  gap: 2px;
}

.landing-footer__lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 9px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.45);
  text-decoration: none;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.landing-footer__lang-btn:hover:not(.landing-footer__lang-btn--disabled) {
  color: var(--color-charge);
  background: rgba(0, 212, 255, 0.12);
}

.landing-footer__lang-btn--active {
  color: var(--color-charge);
  background: rgba(0, 212, 255, 0.12);
}

.landing-footer__lang-btn--disabled {
  opacity: 0.35;
  cursor: default;
  pointer-events: none;
}

@media (max-width: 768px) {
  .landing-footer-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.25rem;
  }

  .landing-footer__legal { justify-content: center; }
}


/* ── §20  Three-up "what it is" block (#59) ─────────────────── */
.landing-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.landing-feature-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.landing-feature-card__title {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.landing-feature-card__body {
  font-size: 0.9375rem;
  color: var(--ink-muted);
  line-height: 1.65;
}

@media (max-width: 720px) {
  .landing-features {
    grid-template-columns: 1fr;
  }
}


/* ── §19  Responsive header ────────────────────────────────── */
/* ── §19  Responsive hero ──────────────────────────────────── */
@media (max-width: 860px) {
  .landing-section--hero {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-content { align-items: center; text-align: center; }
  .hero-eyebrow { justify-content: center; }
  .landing-hero__title { max-width: none; }
  .landing-hero__sub { margin: 0 auto; }
  .hero-ctas { justify-content: center; }

  .qrgen-preview-card {
    width: 180px;
    height: 180px;
    margin: 0 auto;
  }
}

@media (max-width: 600px) {
  .qrgen-app-header { padding: 12px 16px; }
  .qrgen-header-cluster { gap: 10px; }
  .landing-cta-bar { top: 56px; padding: 8px 16px; }
  .landing-section { padding: 2.5rem 1rem; }
  .landing-section--hero { padding-top: 3rem; padding-bottom: 3rem; }

  .qrgen-preview-card { width: 160px; height: 160px; }
}