/*
  QR Forge stylesheet
  - No external fonts or dependencies
  - Responsive, accessible, and print-friendly enough for utility use
*/
:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-soft: #eef2ff;
  --ink: #111827;
  --muted: #5b6475;
  --line: #d8deea;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --danger: #b42318;
  --shadow: 0 24px 70px rgba(17, 24, 39, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --shell: min(1180px, calc(100% - 40px));
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.12), transparent 36rem),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 42%, #ffffff 100%);
  line-height: 1.5;
}

img, svg { max-width: 100%; }

a { color: inherit; }

button,
textarea,
select,
input {
  font: inherit;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: #fff;
  transform: translateY(-140%);
  transition: transform 160ms ease;
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 4;
  border-bottom: 1px solid rgba(216, 222, 234, 0.8);
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(16px);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 74px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 1.08rem;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3px;
  width: 34px;
  height: 34px;
  padding: 5px;
  border-radius: 12px;
  background: var(--ink);
  box-shadow: 0 10px 30px rgba(17, 24, 39, 0.18);
}

.brand-mark span {
  border-radius: 3px;
  background: #fff;
}

.brand-mark span:nth-child(2),
.brand-mark span:nth-child(3) { opacity: 0.45; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.site-nav a {
  border-radius: 999px;
  padding: 0.6rem 0.9rem;
  color: var(--muted);
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: var(--surface-soft);
  color: var(--ink);
}

.hero {
  padding: 78px 0 44px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.04;
  letter-spacing: -0.04em;
}

h1 {
  max-width: 790px;
  font-size: clamp(3rem, 8vw, 6.9rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.5rem);
}

.lede {
  max-width: 690px;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.35rem);
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.7rem 1rem;
  background: #fff;
  color: var(--ink);
  font-weight: 850;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 14px 35px rgba(17, 24, 39, 0.12);
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.button.primary:hover,
.button.primary:focus-visible { background: var(--accent-dark); }

.button.ghost { background: transparent; }

.button.danger {
  color: var(--danger);
}

.hero-art {
  position: relative;
  min-height: 410px;
  display: grid;
  place-items: center;
}

.qr-card-mini {
  position: relative;
  z-index: 1;
  width: min(78vw, 360px);
  aspect-ratio: 1;
  border: 1px solid rgba(216, 222, 234, 0.9);
  border-radius: 38px;
  padding: 2rem;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
  transform: rotate(2deg);
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 0.45rem;
  width: 100%;
  height: 100%;
}

.mini-grid span {
  border-radius: 0.35rem;
  background: #e6ecf8;
}

.mini-grid .on { background: var(--ink); }

.orbit {
  position: absolute;
  border: 1px solid rgba(37, 99, 235, 0.22);
  border-radius: 999px;
}

.orbit.one {
  inset: 12%;
  animation: floatOne 8s ease-in-out infinite;
}

.orbit.two {
  inset: 22% 4% 8% 30%;
  animation: floatTwo 11s ease-in-out infinite;
}

@keyframes floatOne {
  50% { transform: translate3d(0, -12px, 0) rotate(4deg); }
}

@keyframes floatTwo {
  50% { transform: translate3d(16px, 10px, 0) rotate(-5deg); }
}

.generator-section {
  padding: 42px 0 74px;
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 1.5rem;
  text-align: center;
}

.section-heading.align-left {
  margin-inline: 0;
  text-align: left;
}

.section-heading p:not(.eyebrow) {
  color: var(--muted);
  font-size: 1.08rem;
}

.app-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 1.2rem;
  border: 1px solid rgba(216, 222, 234, 0.9);
  border-radius: var(--radius-lg);
  padding: clamp(1rem, 3vw, 1.4rem);
  background: rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow);
}

.controls,
.preview-card,
.info-card {
  border: 1px solid var(--line);
  border-radius: calc(var(--radius-lg) - 8px);
  background: var(--surface);
}

.controls {
  padding: clamp(1rem, 3vw, 1.35rem);
}

.field-block {
  display: grid;
  gap: 0.45rem;
}

label,
.toggle-line {
  color: var(--ink);
  font-size: 0.91rem;
  font-weight: 850;
}

textarea,
select,
input[type="range"] {
  width: 100%;
}

textarea,
select {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--ink);
}

textarea {
  min-height: 210px;
  padding: 1rem;
  resize: vertical;
}

select {
  min-height: 46px;
  padding: 0 0.9rem;
}

input[type="color"] {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
  cursor: pointer;
}

input[type="range"] {
  accent-color: var(--accent);
}

.field-help {
  color: var(--muted);
  font-size: 0.88rem;
}

.option-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.toggle-line {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 46px;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  cursor: pointer;
}

.toggle-line input { width: 1.1rem; height: 1.1rem; }

.preview-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(1rem, 4vw, 1.5rem);
}

.preview-frame {
  display: grid;
  place-items: center;
  min-height: 385px;
  border: 1px dashed #cbd5e1;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(45deg, rgba(148, 163, 184, 0.12) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(148, 163, 184, 0.12) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(148, 163, 184, 0.12) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(148, 163, 184, 0.12) 75%);
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-size: 20px 20px;
  overflow: hidden;
}

.preview-frame svg {
  width: min(100%, 355px);
  height: auto;
  border-radius: 18px;
}

.status {
  min-height: 1.5rem;
  margin: 0.9rem 0;
  color: var(--muted);
  font-weight: 750;
}

.status.error { color: var(--danger); }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 0;
}

.stats-grid div {
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: #fafbff;
}

.stats-grid dt {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stats-grid dd {
  margin: 0.1rem 0 0;
  font-weight: 900;
}

.content-band,
.examples-section {
  padding: 74px 0;
}

.card-grid {
  display: grid;
  gap: 1rem;
}

.card-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.info-card {
  padding: 1.4rem;
}

.info-card h2 {
  margin-top: 0.8rem;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.info-card p {
  color: var(--muted);
}

.icon-dot {
  display: inline-block;
  width: 44px;
  height: 44px;
  border-radius: 15px;
  background:
    linear-gradient(90deg, #fff 34%, transparent 0 66%, #fff 0),
    linear-gradient(#fff 34%, transparent 0 66%, #fff 0),
    var(--accent);
}

.example-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.example-list button {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.75rem 1rem;
  background: #fff;
  color: var(--ink);
  font-weight: 850;
  cursor: pointer;
}

.example-list button:hover,
.example-list button:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-footer a { font-weight: 850; }

:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 3px;
}

@media (max-width: 920px) {
  .hero-grid,
  .app-panel,
  .card-grid.three {
    grid-template-columns: 1fr;
  }

  .hero-art { min-height: 300px; }

  .preview-frame { min-height: 330px; }
}

@media (max-width: 640px) {
  :root { --shell: min(100% - 24px, 1180px); }

  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding: 0.75rem 0;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
  }

  .hero { padding-top: 48px; }

  .option-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .button-row .button,
  .hero-actions .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}