:root {
  color-scheme: dark;
  --lacquer: oklch(7% 0.006 95);
  --lacquer-deep: oklch(4% 0.004 95);
  --raised: oklch(11% 0.006 95);
  --graphite: oklch(15% 0.008 95);
  --graphite-2: oklch(19% 0.008 95);
  --gold: oklch(84% 0.19 80.46);
  --gold-rich: oklch(77% 0.13 82);
  --gold-deep: oklch(61% 0.085 78);
  --patina: oklch(70% 0.12 188);
  --warning: oklch(58% 0.15 35);
  --text: oklch(91% 0 0);
  --body: oklch(86% 0 0);
  --muted: oklch(70% 0 0);
  --faint: oklch(56% 0 0);
  --rule: oklch(78% 0 0 / 0.16);
  --rule-strong: oklch(74% 0.09 82 / 0.6);
  --radius: 6px;
  --font-ui: "Avenir Next", "Albert Sans", "Helvetica Neue", Arial, system-ui, sans-serif;
  --font-display: "Avenir Next Condensed", "Arial Narrow", "Helvetica Neue", Arial, system-ui, sans-serif;
  --font-mono: SFMono-Regular, "Roboto Mono", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

::selection {
  color: var(--lacquer-deep);
  background: var(--gold);
}

html {
  min-height: 100%;
  background: var(--lacquer);
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--body);
  font-family: var(--font-ui);
  line-height: 1.55;
  background:
    linear-gradient(90deg, oklch(84% 0.19 80.46 / 0.06) 1px, transparent 1px) 0 0 / 84px 84px,
    linear-gradient(0deg, oklch(84% 0.19 80.46 / 0.04) 1px, transparent 1px) 0 0 / 84px 84px,
    radial-gradient(circle at 82% 14%, oklch(70% 0.12 188 / 0.14), transparent 28rem),
    var(--lacquer);
}

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

button {
  cursor: pointer;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  min-height: 72px;
  padding: 14px clamp(16px, 4vw, 42px);
  border-bottom: 1px solid var(--rule);
  background: oklch(4% 0.004 95 / 0.92);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--text);
  text-decoration: none;
}

.brand-text {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

.shell {
  width: min(1480px, 100%);
  margin: 0 auto;
  padding: clamp(16px, 3vw, 42px);
}

.workbench {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(340px, 0.95fr);
  gap: clamp(16px, 2.8vw, 34px);
  align-items: start;
}

.controls,
.preview-panel {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--raised);
  box-shadow: 0 24px 70px oklch(2% 0.004 95 / 0.38);
}

.controls {
  display: grid;
  gap: 24px;
  padding: clamp(18px, 3vw, 30px);
}

.preview-panel {
  position: sticky;
  top: 96px;
  display: grid;
  gap: 18px;
  padding: clamp(18px, 3vw, 28px);
}

.section-head {
  display: grid;
  gap: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--rule);
}

.eyebrow {
  margin: 0;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  color: var(--text);
  font-family: var(--font-display);
  line-height: 1.05;
}

h1 {
  font-size: clamp(2.6rem, 6vw, 5rem);
  font-weight: 500;
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 600;
}

.field {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.field > span,
.check-row span {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 650;
}

input,
select,
textarea {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--rule);
  border-radius: 4px;
  color: var(--text);
  background: var(--lacquer-deep);
}

input,
select {
  min-height: 44px;
  padding: 0 12px;
}

textarea {
  resize: vertical;
  padding: 12px;
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--patina);
  outline-offset: 3px;
}

select {
  appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--gold) 50%),
    linear-gradient(135deg, var(--gold) 50%, transparent 50%);
  background-position:
    calc(100% - 18px) 18px,
    calc(100% - 12px) 18px;
  background-size: 6px 6px;
  background-repeat: no-repeat;
  padding-right: 36px;
}

input[type="range"] {
  height: 44px;
  padding: 0;
  accent-color: var(--gold);
  background: transparent;
}

input[type="color"] {
  width: 68px;
  padding: 5px;
}

input[type="file"] {
  padding: 10px;
}

output {
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.grid-2,
.option-grid,
.logo-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.option-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding-top: 22px;
  border-top: 1px solid var(--rule);
}

.payload-panels {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--graphite);
}

.payload-panel {
  display: none;
  gap: 16px;
  padding: 16px;
}

.payload-panel.is-active {
  display: grid;
}

.fine-options {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
}

.check-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 34px;
}

.check-row input {
  width: 18px;
  min-height: 18px;
  accent-color: var(--gold);
}

.color-field {
  justify-items: start;
}

.logo-row {
  grid-template-columns: minmax(0, 1.5fr) minmax(130px, 0.7fr) auto;
  align-items: end;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
}

.file-field input {
  min-height: 48px;
}

.primary-button,
.secondary-button,
.ghost-button {
  min-height: 44px;
  border-radius: 3px;
  padding: 0 18px;
  font-weight: 750;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.primary-button {
  border: 1px solid var(--gold-deep);
  color: var(--lacquer-deep);
  background: linear-gradient(135deg, var(--gold), var(--gold-rich));
}

.secondary-button,
.ghost-button {
  border: 1px solid var(--rule-strong);
  color: var(--gold);
  background: transparent;
}

.ghost-button {
  border-color: var(--rule);
  color: var(--body);
}

.compact {
  padding: 0 14px;
}

.primary-button:hover,
.secondary-button:hover,
.ghost-button:hover {
  transform: translateY(-1px);
  border-color: var(--patina);
}

.preview-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.qr-frame {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  width: 100%;
  min-height: 260px;
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  background: var(--lacquer-deep);
  padding: clamp(12px, 3vw, 26px);
}

.qr-frame.is-transparent {
  background-color: #fff;
  background-image:
    linear-gradient(45deg, #e7e7e7 25%, transparent 25%),
    linear-gradient(-45deg, #e7e7e7 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #e7e7e7 75%),
    linear-gradient(-45deg, transparent 75%, #e7e7e7 75%);
  background-position:
    0 0,
    0 12px,
    12px -12px,
    -12px 0;
  background-size: 24px 24px;
  animation: checker-drift 42s linear infinite;
}

.qr-frame.is-flush {
  padding: 0;
}

canvas {
  display: block;
  width: min(100%, 640px);
  height: auto;
  border-radius: 3px;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.payload-detail {
  border-top: 1px solid var(--rule);
  padding-top: 14px;
}

summary {
  width: max-content;
  color: var(--gold);
  cursor: pointer;
  font-weight: 700;
}

.payload-detail textarea {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.seo-copy {
  max-width: 920px;
  margin: clamp(28px, 5vw, 64px) auto 0;
  color: var(--body);
}

.seo-copy h2 {
  margin: 30px 0 0;
  font-size: clamp(1.9rem, 3.4vw, 3rem);
}

.seo-copy h2:first-child {
  margin-top: 0;
}

.seo-copy h3 {
  margin: 22px 0 0;
  color: var(--text);
  font-size: 1.12rem;
  line-height: 1.25;
}

.seo-copy p {
  margin: 16px 0 0;
  max-width: 78ch;
  color: var(--muted);
}

@keyframes checker-drift {
  to {
    background-position:
      48px 48px,
      48px 60px,
      60px 36px,
      36px 48px;
  }
}

@media (max-width: 1100px) {
  .workbench {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    position: static;
  }
}

@media (max-width: 720px) {
  .topbar {
    align-items: stretch;
    gap: 12px;
    flex-direction: column;
  }

  .button-grid,
  .grid-2,
  .option-grid,
  .logo-row {
    grid-template-columns: 1fr;
  }

  .logo-row {
    align-items: stretch;
  }

  .preview-head {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}