:root {
  color-scheme: light;
  --bg: #f7fafc;
  --panel: #ffffff;
  --panel-soft: #f1f5f7;
  --text: #172033;
  --muted: #607086;
  --line: #dce5ec;
  --accent: #16a34a;
  --accent-dark: #12733a;
  --accent-soft: #e8f8ee;
  --shadow: 0 20px 60px rgba(23, 32, 51, 0.1);
}

:root.dark {
  color-scheme: dark;
  --bg: #11171d;
  --panel: #18212a;
  --panel-soft: #121a21;
  --text: #f4f7fb;
  --muted: #9baabb;
  --line: #2a3744;
  --accent: #4ade80;
  --accent-dark: #86efac;
  --accent-soft: #143421;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

.notice {
  display: flex;
  justify-content: center;
  gap: 24px;
  padding: 10px 16px;
  background: #0f172a;
  color: #f8fafc;
  font-size: 0.84rem;
  font-weight: 700;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px clamp(18px, 5vw, 64px);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand,
.site-header nav,
.hero-actions,
.actions,
.metrics,
.trust-strip {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-size: 1.08rem;
  font-weight: 900;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
}

.site-header nav {
  gap: 22px;
}

.site-header a {
  color: var(--text);
  text-decoration: none;
}

.site-header nav a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.theme-button,
.type-tab,
.actions button,
.primary-link,
.secondary-link {
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.theme-button {
  padding: 0 14px;
  background: var(--panel);
  color: var(--text);
}

.theme-button:hover,
.type-tab:hover,
.actions button:hover,
.primary-link:hover,
.secondary-link:hover {
  transform: translateY(-1px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(300px, 0.82fr) minmax(520px, 1.18fr);
  gap: clamp(28px, 5vw, 70px);
  align-items: start;
  padding: clamp(48px, 8vw, 92px) clamp(18px, 5vw, 64px) 42px;
}

.hero-copy {
  position: sticky;
  top: 104px;
  padding-top: 16px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: clamp(3rem, 7vw, 6.8rem);
  line-height: 0.94;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 4.2rem);
  line-height: 1;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.hero-text {
  max-width: 620px;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.7;
}

.hero-actions {
  gap: 12px;
  margin: 28px 0;
}

.primary-link,
.secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  text-decoration: none;
  font-weight: 900;
}

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

.secondary-link,
.actions button {
  background: var(--panel);
  color: var(--text);
}

.metrics {
  gap: 28px;
  margin: 0;
}

.metrics div {
  min-width: 76px;
}

.metrics dt {
  font-size: 1.4rem;
  font-weight: 900;
}

.metrics dd {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.generator {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.generator-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 22px;
  border-bottom: 1px solid var(--line);
}

.generator-head h2 {
  margin: 0;
  font-size: 1.65rem;
}

#apiState {
  align-self: start;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  padding: 8px 12px;
  font-size: 0.78rem;
  font-weight: 900;
}

.type-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 22px 0;
}

.type-tab {
  background: var(--panel-soft);
  color: var(--text);
  padding: 0 13px;
  font-size: 0.9rem;
  font-weight: 800;
}

.type-tab.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-dark);
}

.generator-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 22px;
  padding: 22px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.field {
  display: grid;
  gap: 7px;
}

.field[hidden] {
  display: none;
}

.span-all {
  grid-column: 1 / -1;
}

label {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  outline: none;
  padding: 11px 12px;
}

textarea {
  resize: vertical;
  min-height: 96px;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
}

input[type="color"] {
  height: 44px;
  padding: 4px;
}

input[type="range"] {
  accent-color: var(--accent);
  padding-inline: 0;
}

.preview {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.qr-stage {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 1;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

#qrImage {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 18px;
}

#emptyState {
  position: absolute;
  inset: auto 26px;
  margin: 0;
  color: #64748b;
  text-align: center;
  font-weight: 800;
}

.payload-box {
  display: grid;
  gap: 7px;
  min-height: 92px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
}

.payload-box span {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
}

output {
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.82rem;
}

.actions {
  gap: 10px;
}

.actions button {
  flex: 1;
  padding: 0 12px;
  font-weight: 900;
}

.status {
  min-height: 22px;
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.trust-strip {
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 22px 18px 52px;
}

.trust-strip span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  padding: 9px 14px;
  color: var(--muted);
  font-weight: 800;
}

.section {
  padding: 64px clamp(18px, 5vw, 64px);
}

.section > h2,
.section > .eyebrow {
  max-width: 760px;
}

.format-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--line);
}

.format-grid article {
  min-height: 170px;
  background: var(--panel);
  padding: 24px;
}

.format-grid p,
.steps li,
.faq p {
  color: var(--muted);
  line-height: 1.65;
}

.steps ol {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--line);
}

.steps li {
  min-height: 168px;
  background: var(--panel);
  padding: 24px;
}

.faq {
  padding-bottom: 92px;
}

details {
  max-width: 900px;
  border-top: 1px solid var(--line);
  padding: 18px 0;
}

details:last-child {
  border-bottom: 1px solid var(--line);
}

summary {
  cursor: pointer;
  font-size: 1.08rem;
  font-weight: 900;
}

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    position: static;
  }

  .generator-grid {
    grid-template-columns: 1fr;
  }

  .preview {
    max-width: 420px;
  }

  .format-grid,
  .steps ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .notice,
  .site-header nav {
    display: none;
  }

  .site-header {
    padding: 14px 16px;
  }

  .hero {
    padding: 38px 16px 28px;
  }

  h1 {
    font-size: clamp(2.7rem, 15vw, 4.2rem);
  }

  .hero-actions,
  .metrics,
  .actions {
    align-items: stretch;
    flex-direction: column;
  }

  .generator-head,
  .generator-grid,
  .type-switch {
    padding-inline: 16px;
  }

  .form-grid,
  .format-grid,
  .steps ol {
    grid-template-columns: 1fr;
  }

  .section {
    padding-inline: 16px;
  }
}