:root {
  --bg: #0d1117;
  --panel: #161b22;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #f85149;
  --line: #30363d;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(248, 81, 73, 0.18), transparent 45%),
    linear-gradient(180deg, #11161d, var(--bg));
}

.panel {
  width: min(92vw, 380px);
  padding: 28px 24px;
  border: 1px solid var(--line);
  background: rgba(22, 27, 34, 0.92);
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
  letter-spacing: 0.08em;
}

.subtitle, .footer {
  color: var(--muted);
  font-size: 14px;
}

.form {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

label {
  font-size: 13px;
  color: var(--muted);
}

input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: #0d1117;
  color: var(--text);
}

button {
  margin-top: 8px;
  padding: 11px 14px;
  border: 0;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.error {
  margin-top: 12px;
  color: #ff7b72;
  font-size: 14px;
}

a { color: #ff7b72; }