:root {
  color-scheme: light dark;
  --bg: #f4f4f7;
  --card: #ffffff;
  --text: #1c1b22;
  --muted: #5b5b66;
  --border: #d7d7db;
  --accent: #0b61d6;
  --accent-text: #ffffff;
  --error: #c50042;
  --danger: #c50042;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1b22;
    --card: #2b2a33;
    --text: #fbfbfe;
    --muted: #b8b7c0;
    --border: #52525e;
    --accent: #6aa4ff;
    --accent-text: #0b0b0f;
    --error: #ff9aa2;
    --danger: #ff6a75;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 6vh 16px;
  line-height: 1.45;
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}

.card.wide {
  max-width: 640px;
}

h1 {
  margin: 0 0 4px;
  font-size: 1.5rem;
}

h2 {
  font-size: 1.05rem;
  margin: 0 0 8px;
}

.subtitle,
.hint,
.note,
small {
  color: var(--muted);
}

.hint {
  font-size: 0.85rem;
}

section {
  margin-top: 20px;
}

label {
  display: block;
  margin: 12px 0;
  font-size: 0.95rem;
}

input[type="email"],
input[type="password"],
input[type="text"] {
  display: block;
  width: 100%;
  margin-top: 4px;
  padding: 9px 10px;
  font: inherit;
  color: inherit;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
}

input:focus-visible,
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

label.check {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin: 6px 14px 6px 0;
}

details {
  margin: 12px 0;
}

summary {
  cursor: pointer;
  color: var(--accent);
}

button {
  font: inherit;
  padding: 9px 16px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}

form > button[type="submit"] {
  width: 100%;
  margin-top: 8px;
}

.row button,
.stack button {
  width: auto;
}

button.secondary {
  background: transparent;
  color: var(--accent);
}

button.destructive {
  background: var(--danger);
  border-color: var(--danger);
}

button:disabled {
  opacity: 0.6;
  cursor: default;
}

a {
  color: var(--accent);
}

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

.switch {
  text-align: center;
}

.row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.row input {
  margin-top: 0;
}

.stack {
  display: grid;
  gap: 8px;
}

.stack input {
  margin-top: 0;
}

.devices {
  list-style: none;
  padding: 0;
  margin: 0;
}

.devices li {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.danger h2 {
  color: var(--danger);
}

.steps li {
  margin: 6px 0;
}