:root {
  --bg: #f4f7ff;
  --card: #ffffff;
  --border: #d7ddea;
  --text: #1d2738;
  --muted: #657089;
  --primary: #2f6cf6;
  --primary-hover: #2458ca;
  --danger: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.auth-card {
  width: min(420px, 92vw);
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
  padding: 20px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

h1 {
  margin: 0 0 8px;
  font-size: 22px;
}

.subtitle {
  margin: 0 0 14px;
  color: var(--muted);
}

form {
  display: grid;
  gap: 8px;
}

label {
  font-size: 14px;
}

input {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 10px;
  font-size: 14px;
}

button {
  margin-top: 6px;
  border: 0;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  padding: 10px;
  cursor: pointer;
}

button:hover {
  background: var(--primary-hover);
}

.msg {
  margin-top: 10px;
  min-height: 20px;
  font-size: 14px;
  color: var(--muted);
}

.msg.error {
  color: var(--danger);
}

.jump {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}