:root {
  color-scheme: dark;
  --bg: #0b1020;
  --bg-accent: #101a33;
  --card: rgba(16, 26, 51, 0.82);
  --card-border: rgba(134, 154, 255, 0.18);
  --text: #eef2ff;
  --muted: #aab4db;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --danger: #fb7185;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.24), transparent 36%),
    radial-gradient(circle at right bottom, rgba(124, 58, 237, 0.18), transparent 30%),
    linear-gradient(180deg, var(--bg), #060816 100%);
}

.shell {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 72px;
}

.hero {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.5rem);
  line-height: 0.95;
  max-width: 12ch;
}

.lede {
  max-width: 62ch;
  margin: 16px 0 0;
  font-size: 1.05rem;
  color: var(--muted);
}

.panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.checkout-form,
.status-card {
  border: 1px solid var(--card-border);
  background: var(--card);
  backdrop-filter: blur(18px);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.checkout-form {
  display: grid;
  gap: 16px;
}

label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

input,
button {
  font: inherit;
}

input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid rgba(148, 163, 184, 0.22);
  color: var(--text);
  background: rgba(8, 12, 26, 0.9);
  outline: none;
}

input:focus {
  border-color: rgba(125, 211, 252, 0.75);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}

button {
  margin-top: 8px;
  padding: 14px 18px;
  border: 0;
  border-radius: 14px;
  color: #07111f;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  cursor: pointer;
}

button:hover {
  filter: brightness(1.06);
}

.status-label {
  margin: 0 0 10px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 700;
}

pre {
  margin: 0;
  min-height: 280px;
  overflow: auto;
  padding: 18px;
  border-radius: 18px;
  background: rgba(4, 8, 18, 0.72);
  color: #dbeafe;
  white-space: pre-wrap;
  word-break: break-word;
}

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

@media (max-width: 800px) {
  .panel {
    grid-template-columns: 1fr;
  }

  .shell {
    padding-top: 32px;
  }
}