:root {
  color-scheme: light;
  font-family: "Inter", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #eef3ff;
  color: #152238;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top left, #dbeafe, transparent 34rem), #f7f9fe;
}

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

.card {
  background: rgba(255,255,255,0.92);
  border: 1px solid rgba(148,163,184,0.28);
  border-radius: 24px;
  box-shadow: 0 20px 50px rgba(15,23,42,0.08);
  padding: 32px;
}

.hero { margin-bottom: 24px; }

.eyebrow {
  color: #2563eb;
  font-weight: 700;
  letter-spacing: .08em;
  margin: 0 0 8px;
  text-transform: uppercase;
}

h1, h2 { margin: 0 0 12px; }
h1 { font-size: clamp(32px, 5vw, 52px); }
h2 { font-size: 24px; }

.muted { color: #64748b; line-height: 1.7; }

.redeem-form { margin-top: 28px; }
label { display: block; margin-bottom: 8px; font-weight: 700; }
.form-help { color: #64748b; margin: 0 0 10px; }

.input-row {
  align-items: start;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
}

input, textarea {
  border: 1px solid #cbd5e1;
  border-radius: 14px;
  font: inherit;
  padding: 14px 16px;
  outline: none;
}
textarea {
  min-height: 112px;
  resize: vertical;
}
input:focus, textarea:focus { border-color: #2563eb; box-shadow: 0 0 0 4px rgba(37,99,235,.12); }

button {
  border: 0;
  border-radius: 14px;
  background: #2563eb;
  color: white;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 14px 18px;
}
button.secondary, .actions button { background: #0f172a; }
button:disabled { cursor: not-allowed; opacity: .62; }

.message { min-height: 24px; font-weight: 700; }
.message.error { color: #dc2626; }
.message.success { color: #16a34a; }

.hidden { display: none; }
.result-heading {
  align-items: start;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.actions { display: flex; gap: 10px; flex-wrap: wrap; }
.format-picker {
  align-items: center;
  display: flex;
  gap: 8px;
}
.format-picker span {
  color: #475569;
  font-size: 14px;
  font-weight: 700;
}
.format-picker select {
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  min-height: 44px;
  padding: 0 12px;
}
.result-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}
.result-item {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  padding: 14px 16px;
}
.result-item strong {
  color: #0f172a;
  display: block;
  font-size: 18px;
  margin-bottom: 6px;
  overflow-wrap: anywhere;
}
.result-item small {
  color: #64748b;
  display: block;
  line-height: 1.6;
}

pre {
  background: #0f172a;
  border-radius: 18px;
  color: #dbeafe;
  margin: 24px 0 0;
  max-height: 460px;
  overflow: auto;
  padding: 20px;
  white-space: pre-wrap;
  word-break: break-word;
}

@media (max-width: 720px) {
  .input-row { grid-template-columns: 1fr; }
  .result-heading { display: block; }
  .actions { margin-top: 16px; }
}