:root {
  color-scheme: light dark;
  --ink: #16181d;
  --ink-2: #5a6070;
  --bg: #f6f6f8;
  --card: #fff;
  --accent: #1f5eff;
  --line: #d9dce3;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #eceef2; --ink-2: #a2a8b6; --bg: #121318; --card: #1c1e25; --line: #2e323c; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-block-size: 100dvh;
  display: grid;
  place-items: center;
  padding-inline: 16px;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Tahoma, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
.card {
  inline-size: min(100%, 26rem);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px;
}
h1 { margin: 0 0 8px; font-size: 1.6rem; letter-spacing: -0.01em; }
p { margin: 0 0 16px; color: var(--ink-2); }
form { display: grid; gap: 10px; margin-block-end: 12px; }
label { font-weight: 600; color: var(--ink); }
input, button {
  font: inherit;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
}
input { background: transparent; color: var(--ink); }
button { background: var(--accent); color: #fff; border-color: transparent; cursor: pointer; }
button[disabled] { opacity: 0.6; cursor: default; }
.msg { color: var(--ink); font-weight: 600; }
.fine { font-size: 0.85rem; margin: 0; }