:root {
  --bg: #f7f7f5; --panel: #ffffff; --text: #1f1f1d; --muted: #6b6b66; --line: #e6e5e1;
  --accent: #1f1f1d; --accent-text: #ffffff; --danger: #c4372b;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161615; --panel: #1e1e1d; --text: #ecebe8; --muted: #9b9a95; --line: #2e2e2c;
    --accent: #ecebe8; --accent-text: #161615; --danger: #ef7a6e;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  background: var(--bg); color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
}
.box { width: 100%; max-width: 360px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 28px; }
h1 { font-size: 20px; margin: 0 0 4px; letter-spacing: -0.01em; }
.sub { color: var(--muted); margin: 0 0 20px; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
input {
  width: 100%; font: inherit; color: inherit; background: transparent;
  border: 1px solid var(--line); border-radius: 6px; padding: 9px 11px; margin-bottom: 14px;
}
input:focus { outline: 2px solid var(--text); outline-offset: -1px; }
button {
  width: 100%; font: inherit; font-weight: 600; border: 0; border-radius: 6px; padding: 10px;
  background: var(--accent); color: var(--accent-text); cursor: pointer;
}
.err { color: var(--danger); margin: 14px 0 0; font-size: 14px; }