:root {
  --primary: #3b4cca;
  --navy: #0b1f4b;
  --accent-text: #0f766e;
  --bg: #ffffff;
  --surface: #f5f6fb;
  --text: #0b1f4b;
  --muted: #4a5578;
  --border: #d7dbea;
  --error: #b42318;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #8e99f5;
    --bg: #0b1324;
    --surface: #141d33;
    --text: #e8ebf7;
    --muted: #a7b0cc;
    --border: #2a3553;
    --accent-text: #14b8a6;
    --error: #ff8a80;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font:
    16px/1.55 system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    sans-serif;
}
.bar {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
  font-size: 18px;
}
main {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}
h1 {
  font-size: 28px;
  line-height: 1.2;
  margin: 8px 0;
}
h2 {
  font-size: 19px;
  margin-top: 32px;
}
.lead {
  color: var(--muted);
  font-size: 18px;
}
section {
  margin-top: 8px;
}
form {
  display: grid;
  gap: 8px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}
label {
  font-weight: 600;
  margin-top: 8px;
}
.optional {
  font-weight: 400;
  color: var(--muted);
}
input,
textarea {
  width: 100%;
  padding: 12px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}
input:focus,
textarea:focus,
button:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}
button {
  margin-top: 8px;
  min-height: 48px;
  padding: 0 20px;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border: 0;
  border-radius: 12px;
  cursor: pointer;
}
@media (prefers-color-scheme: dark) {
  button {
    color: #0b1324;
  }
}
button[disabled] {
  opacity: 0.6;
  cursor: progress;
}
.error {
  color: var(--error);
  margin: 0;
}
.done {
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--accent-text);
}
.done h3 {
  margin-top: 0;
  color: var(--accent-text);
}
.small {
  color: var(--muted);
  font-size: 14px;
  margin-top: 40px;
}
a {
  color: var(--primary);
}