:root {
  --bg: #eef2ef;
  --ink: #13211a;
  --muted: #65736b;
  --brand: #0c6a58;
  --brand-dark: #084d40;
  --line: #d5ded8;
  --danger: #a83c32;
}

* {
  box-sizing: border-box;
}

body {
  align-items: center;
  background: var(--bg);
  color: var(--ink);
  display: flex;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  justify-content: center;
  margin: 0;
  min-height: 100vh;
}

.login-card {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 18px 42px rgba(18, 33, 25, 0.14);
  padding: 30px;
  width: 360px;
}

h1 {
  font-size: 26px;
  margin: 0 0 8px;
}

p {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 22px;
}

form {
  display: grid;
  gap: 14px;
}

label {
  color: var(--muted);
  display: grid;
  font-size: 13px;
  gap: 6px;
}

input {
  border: 1px solid #b9c6bf;
  border-radius: 4px;
  color: var(--ink);
  font: inherit;
  min-height: 40px;
  outline: 0;
  padding: 8px 10px;
}

input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(12, 106, 88, 0.14);
}

button {
  background: var(--brand);
  border: 1px solid var(--brand);
  border-radius: 4px;
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  min-height: 42px;
}

button:hover {
  background: var(--brand-dark);
}

.login-error {
  color: var(--danger);
  font-size: 13px;
  min-height: 18px;
  margin-top: 12px;
}