:root {
  color-scheme: dark;
  --bg: #071827;
  --card: #0d2236;
  --line: #1c3a55;
  --text: #f1f7fc;
  --muted: #9db4c8;
  --faint: #7891a8;
  --primary: #15c9e8;
  --danger: #ff5a6e;
  --warning: #ffb547;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font:
    16px/1.55 system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    Arial,
    sans-serif;
}
main {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}
a {
  color: var(--primary);
}
.brand {
  font-size: 22px;
  font-weight: 800;
  margin: 0 0 24px;
}
.brand a {
  color: var(--text);
  text-decoration: none;
}
.brand span {
  color: var(--primary);
}
h1 {
  font-size: 28px;
  line-height: 1.2;
  margin: 0 0 12px;
}
h2 {
  font-size: 18px;
  margin: 0 0 8px;
}
h2.small {
  font-size: 16px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
h2:focus {
  outline: none;
}
.lead,
p {
  color: var(--muted);
}
strong {
  color: var(--text);
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  margin: 16px 0;
}
[data-step] {
  margin-top: 20px;
}
ul {
  color: var(--muted);
  padding-left: 20px;
}
li + li {
  margin-top: 8px;
}
label {
  display: block;
  font-weight: 600;
  margin: 8px 0 6px;
}
input {
  width: 100%;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
}
input:focus-visible,
button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}
button {
  display: block;
  width: 100%;
  margin-top: 14px;
  font: inherit;
  font-weight: 700;
  color: var(--bg);
  background: var(--primary);
  border: 0;
  border-radius: 12px;
  padding: 14px 18px;
  cursor: pointer;
}
button.danger {
  background: var(--danger);
}
button.link {
  background: none;
  color: var(--muted);
  font-weight: 500;
  text-decoration: underline;
}
button:disabled {
  opacity: 0.6;
  cursor: progress;
}
.error {
  color: var(--danger);
  margin: 8px 0 0;
}
.warning {
  border-left: 3px solid var(--warning);
  padding-left: 12px;
}