:root {
  --bg: #f5f5f4;
  --card: #ffffff;
  --text: #1c1917;
  --muted: #78716c;
  --border: #e7e5e4;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --danger: #dc2626;
  --ok: #15803d;
  --error-bg: #fef2f2;
  --ok-bg: #f0fdf4;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0a09;
    --card: #1c1917;
    --text: #f5f5f4;
    --muted: #a8a29e;
    --border: #292524;
    --accent: #3b82f6;
    --danger: #f87171;
    --ok: #4ade80;
    --error-bg: #2a1212;
    --ok-bg: #0f2417;
  }
}

* { 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", Roboto, sans-serif;
}

.card {
  width: 100%;
  max-width: 440px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
}

h1 { margin: 0 0 20px; font-size: 1.5rem; letter-spacing: -0.01em; }
h2 { margin: 24px 0 8px; font-size: 1rem; }

.tabs { display: flex; gap: 4px; margin-bottom: 20px; border-bottom: 1px solid var(--border); }
.tabs button {
  background: none;
  color: var(--muted);
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  padding: 8px 12px;
  margin-bottom: -1px;
  width: auto;
}
.tabs button[aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); }

form { display: grid; gap: 14px; }
label { display: grid; gap: 6px; font-size: 0.9rem; font-weight: 500; }

input {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

button {
  font: inherit;
  font-weight: 500;
  padding: 10px 14px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  width: 100%;
}
button:disabled { opacity: 0.55; cursor: default; }
button.secondary { background: none; color: var(--text); border: 1px solid var(--border); }
button.link { background: none; color: var(--accent); padding: 4px 6px; width: auto; font-weight: 400; }
button.link.danger { color: var(--danger); }

.row { display: flex; gap: 10px; }
.muted { color: var(--muted); font-weight: 400; }
.hint { margin: 0; color: var(--muted); font-size: 0.85rem; }
.who { margin: 0; }

#status { margin: 0 0 16px; padding: 10px 12px; border-radius: 8px; font-size: 0.9rem; }
#status[data-kind="error"] { background: var(--error-bg); color: var(--danger); }
#status[data-kind="ok"] { background: var(--ok-bg); color: var(--ok); }

#passkeys { list-style: none; margin: 0 0 12px; padding: 0; border: 1px solid var(--border); border-radius: 10px; }
#passkeys li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
}
#passkeys li + li { border-top: 1px solid var(--border); }
#passkeys li div:first-child { display: grid; min-width: 0; }
#passkeys .muted { font-size: 0.8rem; }
#passkeys .actions { display: flex; flex-shrink: 0; }