:root {
  color-scheme: light dark;
  --bg: light-dark(#f4f5f8, #0f1115);
  --card: light-dark(#ffffff, #181b22);
  --border: light-dark(#e2e5ec, #262a35);
  --text: light-dark(#1b1e26, #e7e9ee);
  --muted: light-dark(#5f6675, #9097a6);
  --accent: light-dark(oklch(50% 0.2 265), oklch(78% 0.13 250));
  --error: light-dark(#b42318, #ff8a80);
  accent-color: var(--accent);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.4;
  padding: 1.25rem;
}
main {
  width: 100%;
  max-width: 360px;
  padding: 1.75rem 1.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
}
h1 { margin: 0 0 1.25rem; font-size: 1.4rem; }
form { display: grid; gap: 1rem; }
label { display: grid; gap: .35rem; font-size: .9rem; color: var(--muted); }
input {
  padding: .65rem .9rem;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
}
input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
  padding: .7rem 1rem;
  font: inherit;
  font-weight: 600;
  color: var(--card);
  background: var(--accent);
  border: 0;
  border-radius: 10px;
  cursor: pointer;
}
button:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }
.error { margin: 0 0 1rem; color: var(--error); font-size: .9rem; }