:root {
  --bg: #0d1117; --panel: #151b23; --panel2: #1c242e;
  --line: #262e3a; --text: #e6edf3; --muted: #8b98a8; --accent: #e11d48;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center;
  background: var(--bg); color: var(--text); padding: 20px;
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.box {
  width: 100%; max-width: 360px; padding: 30px 28px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
}
h1 { margin: 0 0 4px; font-size: 21px; }
h1::before {
  content: ""; display: inline-block; width: 9px; height: 9px;
  margin-right: 9px; border-radius: 50%; background: var(--accent);
  vertical-align: middle;
}
.sub { margin: 0 0 22px; color: var(--muted); font-size: 13.5px; }
label { display: block; margin-bottom: 6px; font-size: 13px; color: var(--muted); }
input {
  width: 100%; margin-bottom: 16px; padding: 10px 12px;
  background: var(--panel2); border: 1px solid var(--line); border-radius: 8px;
  color: var(--text); font-size: 15px; outline: none;
}
input:focus { border-color: var(--accent); }
button {
  width: 100%; padding: 11px; border: 0; border-radius: 8px;
  background: var(--accent); color: #fff; font-size: 15px; font-weight: 600;
  cursor: pointer;
}
button:hover:not(:disabled) { filter: brightness(1.1); }
button:disabled { opacity: .6; cursor: default; }
.err {
  margin: 14px 0 0; padding: 9px 11px; border-radius: 8px; font-size: 13.5px;
  background: rgba(248,81,73,.12); border: 1px solid rgba(248,81,73,.35);
  color: #f85149;
}
.err[hidden] { display: none; }