:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --line: #d8e2ee;
  --text: #17202a;
  --muted: #667085;
  --brand: #14532d;
  --accent: #0f766e;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

main {
  width: min(420px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 28px;
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
}

h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0;
}

h2 {
  margin: 8px 0 0;
  font-size: 18px;
  letter-spacing: 0;
}

p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

form {
  margin-top: 22px;
  display: grid;
  gap: 14px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
}

input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 11px 12px;
  font: inherit;
  color: var(--text);
  background: #ffffff;
}

input:focus {
  outline: 2px solid rgba(15, 118, 110, 0.2);
  border-color: var(--accent);
}

button {
  border: 0;
  border-radius: 6px;
  padding: 11px 14px;
  font: inherit;
  font-weight: 700;
  color: #ffffff;
  background: var(--brand);
  cursor: pointer;
}

button:disabled {
  opacity: 0.65;
  cursor: wait;
}

.error {
  min-height: 22px;
  color: var(--danger);
  font-size: 13px;
}