:root {
  --bg: #f3f4f6; --card: #ffffff; --fg: #1b1d21; --muted: #565c66; --border: #dfe2e7;
  --accent: #1d4ed8; --accent-fg: #ffffff; --danger: #b42318;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14161a; --card: #1d2025; --fg: #eceef1; --muted: #a3a9b3; --border: #2c3037;
          --accent: #7aa2ff; --accent-fg: #0b0d10; --danger: #ff8a80; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 1rem;
       font: 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--fg); background: var(--bg); }
.card { width: min(100%, 28rem); background: var(--card); border: 1px solid var(--border); border-radius: 1rem;
        padding: clamp(1.25rem, 6vw, 2rem); }
h1 { font-size: 1.5rem; line-height: 1.25; margin: 0 0 .75rem; }
.lead { color: var(--muted); }
.hint { color: var(--muted); font-size: .9rem; }
.error { color: var(--danger); font-weight: 600; }
label { display: block; font-weight: 600; margin: 1rem 0 .25rem; }
input[type=password], input[type=email], input[type=text] { width: 100%; padding: .7rem .8rem; font: inherit; color: inherit; background: var(--bg);
                       border: 1px solid var(--border); border-radius: .6rem; }
input:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
button { padding: .75rem 1.25rem; font: inherit; font-weight: 600; border: 0; border-radius: .6rem; cursor: pointer;
         background: var(--accent); color: var(--accent-fg); }
form > button { margin-top: 1rem; width: 100%; }
button.secondary { background: transparent; color: var(--fg); border: 1px solid var(--border); }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.25rem; }
.actions form { flex: 1 1 8rem; }
.actions button { width: 100%; }
ul { padding-left: 1.2rem; }
.note { color: var(--accent); font-weight: 600; }
code { font-size: .9em; }