:root {
  color-scheme: dark;
  --bg: #02070d;
  --surface: rgba(6, 17, 26, 0.94);
  --surface-raised: #091722;
  --line: rgba(100, 143, 167, 0.34);
  --line-strong: rgba(116, 166, 191, 0.56);
  --text: #f2f7fa;
  --muted: #a8bac6;
  --dim: #7f96a6;
  --accent: #45e6df;
  --good: #62e6a7;
  --bad: #ff6685;
  --header-h: 68px;
  --shell: 1280px;
  --sans: "Helvetica Neue", Helvetica, Arial, ui-sans-serif, system-ui, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html { min-width: 0; overflow-x: clip; background: var(--bg); }

body {
  min-width: 0;
  margin: 0;
  overflow-x: clip;
  background:
    radial-gradient(900px 620px at 76% 44%, rgba(69, 230, 223, 0.08), transparent 66%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

button, textarea { font: inherit; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 10px;
  inset-inline-start: 12px;
  padding: 10px 13px;
  border-radius: 8px;
  background: var(--accent);
  color: #031012;
  font-weight: 700;
  transform: translateY(-150%);
}

.skip-link:focus { transform: none; }

.receipt-header {
  position: relative;
  z-index: 10;
  height: var(--header-h);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(24px, 5vw, 72px);
  padding: 0 max(24px, calc((100vw - var(--shell)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(2, 7, 13, 0.9);
  backdrop-filter: blur(16px);
}

.receipt-brand {
  width: 116px;
  display: inline-flex;
  align-items: center;
  line-height: 0;
}

.receipt-brand img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

.receipt-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-self: end;
  min-width: 0;
}

.receipt-nav .navlinks {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.2vw, 32px);
}

.receipt-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  color: var(--dim);
  font: 600 10px/1 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}

.receipt-nav a:hover,
.receipt-nav a[aria-current="page"] {
  border-bottom-color: var(--accent);
  color: var(--text);
}

main { min-height: calc(100dvh - var(--header-h)); }

.receipt-hero {
  width: min(var(--shell), calc(100% - 48px));
  min-height: calc(100dvh - var(--header-h));
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(320px, 0.76fr) minmax(520px, 1.24fr);
  align-items: center;
  gap: clamp(48px, 7vw, 108px);
  padding: 28px 0 34px;
}

.receipt-intro { max-width: 500px; }

.receipt-intro h1 {
  max-width: 7.8ch;
  margin: 0;
  font-size: clamp(4rem, 6.7vw, 6.6rem);
  font-weight: 500;
  line-height: 0.92;
  letter-spacing: -0.065em;
  text-wrap: balance;
}

.receipt-support {
  max-width: 48ch;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.35vw, 1.16rem);
  line-height: 1.58;
}

.receipt-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-top: 30px;
}

.receipt-primary,
.receipt-secondary,
.verifier-controls button {
  min-height: 48px;
  border-radius: 8px;
  font: 650 10px/1 var(--mono);
  letter-spacing: 0.045em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.receipt-primary {
  padding: 0 18px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #031012;
}

.receipt-secondary {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  padding: 0 4px;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  color: var(--muted);
}

.receipt-primary:hover,
.verifier-controls button:hover:not(:disabled) { transform: translateY(-1px); }
.receipt-secondary:hover { color: var(--text); border-color: var(--accent); }
.receipt-primary:active,
.verifier-controls button:active:not(:disabled) { transform: translateY(1px); }
.receipt-primary:disabled { cursor: wait; opacity: 0.62; }

.receipt-verifier {
  min-width: 0;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.34);
}

.verifier-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.verifier-label,
.receipt-input-label {
  color: var(--dim);
  font: 600 9px/1.2 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.verifier-heading h2 {
  margin: 8px 0 0;
  font-size: clamp(1.55rem, 2.7vw, 2.35rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.045em;
}

.verifier-state {
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--dim);
  font: 600 9px/1 var(--mono);
  text-transform: uppercase;
}

.verifier-state[data-state="valid"] { color: var(--good); border-color: rgba(98, 230, 167, 0.42); }
.verifier-state[data-state="invalid"] { color: var(--bad); border-color: rgba(255, 102, 133, 0.46); }

.inference-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 20px;
  margin: 19px 0 0;
  border-top: 1px solid var(--line);
}

.inference-summary[hidden] { display: none; }

.inference-row {
  min-width: 0;
  display: grid;
  gap: 5px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.inference-row span { color: var(--dim); font: 500 9px/1.2 var(--mono); text-transform: uppercase; }
.inference-row strong { overflow-wrap: anywhere; color: var(--text); font: 600 11px/1.4 var(--mono); }
.inference-row strong[data-state="different"] { color: var(--bad); }
.inference-row strong[data-state="same"] { color: var(--good); }

.receipt-input-label {
  display: block;
  margin-top: 20px;
}

.receipt-input {
  width: 100%;
  min-height: 112px;
  max-height: 190px;
  margin-top: 8px;
  resize: vertical;
  padding: 12px 13px;
  border: 1px solid var(--line);
  border-radius: 9px;
  outline: 0;
  background: #030a10;
  color: #c6d5df;
  font: 11px/1.5 var(--mono);
}

.receipt-input::placeholder { color: #718897; opacity: 1; }
.receipt-input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(69, 230, 223, 0.12); }

.verifier-controls {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.verifier-controls button {
  flex: 1;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  background: var(--surface-raised);
  color: var(--text);
}

.verifier-controls button:disabled { cursor: not-allowed; opacity: 0.46; }

.verification-result {
  min-height: 72px;
  display: grid;
  align-content: center;
  gap: 5px;
  margin-top: 12px;
  padding: 13px 14px;
  border-inline-start: 2px solid var(--line-strong);
  background: rgba(9, 23, 34, 0.54);
}

.verification-result strong { font-size: 14px; font-weight: 600; }
.verification-result span { color: var(--muted); font-size: 12px; line-height: 1.45; }
.verification-result[data-state="valid"] { border-inline-start-color: var(--good); }
.verification-result[data-state="valid"] strong { color: var(--good); }
.verification-result[data-state="invalid"] { border-inline-start-color: var(--bad); }
.verification-result[data-state="invalid"] strong { color: var(--bad); }

.verifier-boundary {
  display: block;
  margin-top: 13px;
  color: var(--dim);
  font-size: 11px;
  line-height: 1.5;
}

@media (min-width: 821px) and (max-height: 760px) {
  .receipt-hero { padding-block: 18px 22px; gap: clamp(38px, 5vw, 74px); }
  .receipt-intro h1 { font-size: clamp(3.7rem, 6vw, 5.3rem); }
  .receipt-support { margin-top: 20px; }
  .receipt-actions { margin-top: 22px; }
  .receipt-verifier { padding: 20px 22px; }
  .receipt-input { min-height: 96px; max-height: 130px; }
  .receipt-input-label { margin-top: 15px; }
  .verification-result { min-height: 64px; }
}

@media (max-width: 820px) {
  :root { --header-h: 68px; }
  .receipt-header {
    height: var(--header-h);
    grid-template-columns: auto minmax(0, 1fr);
    gap: 18px;
    padding: 0 16px;
  }
  .receipt-brand { width: 96px; }
  .receipt-nav {
    width: auto;
    justify-self: end;
  }
  .receipt-nav .navlinks { width: 0; gap: 0; overflow: hidden; }
  .receipt-nav .navlinks > a { display: none; }
  .receipt-hero {
    width: min(100% - 32px, 620px);
    min-height: calc(100dvh - var(--header-h));
    grid-template-columns: 1fr;
    align-content: start;
    gap: 26px;
    padding: 32px 0 42px;
  }
  .receipt-intro { max-width: none; }
  .receipt-intro h1 { max-width: 9ch; font-size: clamp(3.25rem, 15vw, 5rem); }
  .receipt-support { max-width: 38ch; margin-top: 18px; font-size: 0.98rem; }
  .receipt-actions { margin-top: 20px; }
  .receipt-verifier { padding: 19px 16px; border-radius: 13px; }
  .receipt-input { min-height: 96px; }
}

@media (max-width: 430px) {
  .receipt-hero { width: calc(100% - 24px); padding: 16px 0 12px; gap: 12px; }
  .receipt-intro h1 { font-size: clamp(3rem, 15.5vw, 4rem); }
  .receipt-support { font-size: 0.92rem; line-height: 1.5; }
  .receipt-actions { display: grid; grid-template-columns: 1fr; gap: 8px; }
  .receipt-primary { width: 100%; min-height: 50px; }
  .receipt-secondary { width: max-content; min-height: 40px; }
  .verifier-heading h2 { font-size: 1.6rem; }
  .inference-summary { grid-template-columns: 1fr; }
  .receipt-verifier { padding: 14px 16px; }
  .receipt-input { min-height: 72px; }
  .verifier-controls { display: grid; grid-template-columns: 1fr 1fr; }
  .verifier-controls button { min-width: 0; font-size: 9px; }
}

@media (max-width: 370px) {
  .receipt-hero { padding: 10px 0 6px; gap: 8px; }
  .receipt-verifier { padding: 10px 14px; }
  .verifier-boundary { margin-top: 8px; }
}

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

@media (forced-colors: active) {
  .receipt-primary, .receipt-verifier, .receipt-input, .verifier-controls button { border: 1px solid ButtonText; }
}