:root {
  color-scheme: light;
  --bg: #f8fafc;
  --panel: #ffffff;
  --ink: #171717;
  --muted: #5f6873;
  --line: #d9e0e7;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --gold: #a16207;
  --soft-blue: #e7f0ff;
  --soft-green: #dff7ef;
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    linear-gradient(120deg, rgba(231, 240, 255, 0.8), transparent 32rem),
    linear-gradient(250deg, rgba(223, 247, 239, 0.85), transparent 34rem),
    var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
}

button,
input,
textarea {
  font: inherit;
}

.page {
  min-height: 100vh;
  padding: 28px;
}

.shell {
  width: min(1120px, 100%);
  margin: 0 auto;
}

.topbar,
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  border: 2px solid var(--ink);
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  padding: 4px;
  background: var(--panel);
}

.brand-mark span {
  background: var(--ink);
}

.nav-link {
  border-bottom: 1px solid transparent;
  color: var(--muted);
  font-size: 0.95rem;
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  border-color: var(--accent);
  color: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 460px);
  gap: 48px;
  align-items: center;
  padding: 86px 0 58px;
}

.eyebrow {
  color: var(--accent-strong);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  margin: 0 0 16px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(3.4rem, 9vw, 7.4rem);
  letter-spacing: 0;
  line-height: 0.88;
  margin: 0;
}

.intro {
  color: var(--muted);
  font-size: 1.18rem;
  line-height: 1.7;
  margin: 28px 0 0;
  max-width: 620px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  align-items: center;
  border: 1px solid var(--ink);
  cursor: pointer;
  display: inline-flex;
  font-weight: 800;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  text-decoration: none;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button.primary {
  background: var(--ink);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.18);
  color: #ffffff;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.64);
}

.button:hover,
.button:focus-visible {
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.16);
  transform: translateY(-2px);
}

.preview {
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 26px;
}

.qr-frame {
  align-items: center;
  aspect-ratio: 1;
  background: #ffffff;
  border: 1px solid var(--line);
  display: flex;
  justify-content: center;
  margin-bottom: 22px;
  padding: 28px;
}

.qr-grid {
  display: grid;
  gap: 6px;
  grid-template-columns: repeat(7, 1fr);
  width: min(260px, 100%);
}

.qr-grid span {
  aspect-ratio: 1;
  background: var(--ink);
}

.qr-grid span:nth-child(3n),
.qr-grid span:nth-child(5n) {
  background: var(--accent);
}

.qr-grid span:nth-child(8n) {
  background: var(--gold);
}

.preview h2,
.section-title {
  font-size: 1.1rem;
  letter-spacing: 0;
  margin: 0;
}

.preview p,
.step p,
.footer {
  color: var(--muted);
  line-height: 1.6;
}

.workspace {
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  padding: 36px 0 56px;
}

.composer,
.payload {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  padding: 22px;
}

.field {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.field span {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

input,
textarea {
  background: #ffffff;
  border: 1px solid var(--line);
  color: var(--ink);
  min-height: 44px;
  outline: none;
  padding: 12px 14px;
  transition: border-color 180ms ease, box-shadow 180ms ease;
  width: 100%;
}

textarea {
  min-height: 132px;
  resize: vertical;
}

input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(15, 118, 110, 0.14);
}

.status {
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 800;
  margin: 14px 0 0;
}

pre {
  background: #101828;
  color: #eef7ff;
  margin: 18px 0 0;
  min-height: 220px;
  overflow: auto;
  padding: 18px;
  white-space: pre-wrap;
}

.steps {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, 1fr);
  padding: 0 0 64px;
}

.step {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  padding: 20px;
}

.step-number {
  align-items: center;
  background: var(--soft-green);
  color: var(--accent-strong);
  display: inline-flex;
  font-size: 0.8rem;
  font-weight: 900;
  height: 28px;
  justify-content: center;
  margin-bottom: 16px;
  width: 28px;
}

.footer {
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
  padding: 24px 0 6px;
}

@media (max-width: 840px) {
  .hero,
  .workspace,
  .steps {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 58px;
  }

  .preview {
    order: -1;
  }
}

@media (max-width: 560px) {
  .page {
    padding: 18px;
  }

  .topbar,
  .footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .actions,
  .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}