:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1f23;
  --muted: #5d6470;
  --border: #dde1e6;
  --accent: #1f4fd8;
  --accent-text: #ffffff;
  --error: #c62828;
  --nda-bg: #fafbfc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --card: #1a1d22;
    --text: #e8eaed;
    --muted: #9aa1ac;
    --border: #2d3138;
    --accent: #5b82f0;
    --accent-text: #0b0d10;
    --error: #ef6b6b;
    --nda-bg: #15181c;
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  padding: 48px 16px;
}

.card {
  max-width: 760px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
}

.card.narrow {
  max-width: 440px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 8px;
  font-size: 26px;
  line-height: 1.25;
}

.muted {
  color: var(--muted);
  margin: 0 0 24px;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

input {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 16px;
}

input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

button, .button {
  display: inline-block;
  padding: 12px 22px;
  font: inherit;
  font-weight: 600;
  color: var(--accent-text);
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
}

button:disabled {
  opacity: .6;
  cursor: default;
}

button.busy:disabled {
  opacity: 1;
  cursor: progress;
}

.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  margin-right: 10px;
  vertical-align: -0.15em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .spinner { animation-duration: 2s; }
}

.error {
  color: var(--error);
  margin: 12px 0 0;
  min-height: 1em;
}

.nda {
  max-height: 55vh;
  overflow-y: auto;
  padding: 24px;
  margin-bottom: 24px;
  background: var(--nda-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 15px;
}

.nda h2 {
  text-align: center;
  font-size: 17px;
  text-transform: uppercase;
  margin: 0 0 20px;
}

.nda p {
  margin: 0 0 12px;
}

.nda hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.signatories {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.signatories .label {
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.signature {
  font-family: "Brush Script MT", "Segoe Script", cursive;
  font-size: 24px;
}

.fine-print {
  color: var(--muted);
  font-size: 14px;
  margin: -4px 0 20px;
}

@media (max-width: 560px) {
  main { padding: 16px; }
  .card { padding: 20px; }
  .nda { padding: 16px; }
  .signatories { grid-template-columns: 1fr; }
}