:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1b1f24;
  --muted: #5d6673;
  --line: #d9dee5;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --error: #b42318;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418;
    --card: #1a1f25;
    --text: #e8ebef;
    --muted: #9aa4b1;
    --line: #2c333c;
    --accent: #5b8cff;
    --accent-text: #0b0e12;
    --error: #ff8a80;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { padding: 16px; max-width: 960px; margin: 0 auto; }
main.narrow { max-width: 400px; padding-top: 12vh; }
h1 { font-size: 1.5rem; margin: 0 0 12px; }
.brand { font-weight: 700; letter-spacing: .01em; }
h1.brand { text-align: center; font-size: 2rem; margin-bottom: 24px; }
.muted { color: var(--muted); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
}
form.card { display: grid; gap: 16px; }
label { display: grid; gap: 6px; font-size: .9rem; color: var(--muted); }
input {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  width: 100%;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 8px;
  padding: 12px 16px;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}
button.link { background: none; color: var(--muted); padding: 8px; font-weight: 400; }
.error { color: var(--error); margin: 0; }
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  padding-top: max(8px, env(safe-area-inset-top));
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.bar form { margin: 0; }