:root {
  --bg: #0e1116;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #2f81f7;
  --err: #f85149;
  --card: #161b22;
  --border: #30363d;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg); color: var(--fg);
}
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: 2rem; width: min(360px, 90vw);
}
h1 { margin: 0 0 0.25rem; font-size: 1.25rem; }
.hint { color: var(--muted); margin: 0 0 1.25rem; font-size: 0.875rem; }
form { display: flex; flex-direction: column; gap: 0.75rem; }
label { display: flex; flex-direction: column; gap: 0.25rem; font-size: 0.875rem; }
input {
  background: var(--bg); color: var(--fg); border: 1px solid var(--border);
  border-radius: 6px; padding: 0.5rem 0.625rem; font-size: 1rem;
}
input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
button {
  background: var(--accent); color: white; border: 0; border-radius: 6px;
  padding: 0.5rem 0.75rem; font-size: 0.9375rem; cursor: pointer;
}
button:hover { filter: brightness(1.1); }
.err { color: var(--err); font-size: 0.875rem; margin: 0; }
.row { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.muted { color: var(--muted); font-size: 0.875rem; }