:root { --bg: #f4f5f7; --panel: #fff; --text: #1d2330; --accent: #e8590c; --muted: #6b7280; }
@media (prefers-color-scheme: dark) { :root { --bg: #14161b; --panel: #1f232b; --text: #e8eaed; --muted: #9aa0a6; } }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
.box { background: var(--panel); padding: 32px; border-radius: 12px; width: min(320px, 90vw); display: grid; gap: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,.12); }
h1 { font-size: 20px; margin: 0 0 8px; }
input, button { font: inherit; padding: 10px 12px; border-radius: 8px; border: 1px solid #8884; background: transparent; color: inherit; }
button { background: var(--accent); color: #fff; border: 0; cursor: pointer; font-weight: 600; }
#erro { color: #e03131; margin: 0; min-height: 1em; font-size: 14px; }