:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1f24;
  --muted: #5d6470;
  --border: #d5d9e0;
  --accent: #2456d6;
  --accent-text: #ffffff;
  --error-bg: #fdecec;
  --error-text: #8a1c1c;
  --notice-bg: #e8f1fd;
  --notice-text: #1a3f7a;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --card: #1b1e24;
    --text: #e6e8ec;
    --muted: #9aa2ae;
    --border: #343a44;
    --accent: #6b93ff;
    --accent-text: #0b0d10;
    --error-bg: #3a1a1a;
    --error-text: #ffb4b4;
    --notice-bg: #172a45;
    --notice-text: #b8d3ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 16px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
.card {
  width: 100%;
  max-width: 380px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}
.brand { margin: 0 0 8px; font-size: 13px; font-weight: 600; letter-spacing: .08em; color: var(--muted); }
h1 { margin: 0 0 16px; font-size: 22px; }
p { margin: 0 0 16px; }
form { display: grid; gap: 6px; }
label { font-size: 14px; color: var(--muted); margin-top: 8px; }
input {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
}
input:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
  margin-top: 16px;
  font: inherit;
  font-weight: 600;
  padding: 10px 12px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}
button.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.error, .notice { padding: 10px 12px; border-radius: 8px; font-size: 14px; }
.error { background: var(--error-bg); color: var(--error-text); }
.notice { background: var(--notice-bg); color: var(--notice-text); }
dl { margin: 0 0 8px; display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; font-size: 14px; }
dt { color: var(--muted); }
dd { margin: 0; overflow-wrap: anywhere; }
a { color: var(--accent); }
h2 { margin: 24px 0 8px; font-size: 16px; }
.hint { display: block; font-size: 13px; color: var(--muted); }
.passkey { display: grid; gap: 6px; }
.passkeys { list-style: none; margin: 0 0 8px; padding: 0; display: grid; gap: 8px; }
.passkeys li { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; }
details { margin: 8px 0; }
summary { cursor: pointer; color: var(--accent); font-size: 14px; }
details[open] summary { margin-bottom: 8px; }
select {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
}
button:disabled { opacity: .6; cursor: progress; }
.signout { margin-top: 16px; }