:root {
  --bg-a: #f0f8ff;
  --bg-b: #e5f4ea;
  --card: #ffffff;
  --text: #163030;
  --muted: #557575;
  --primary: #007f5f;
  --primary-hover: #00614a;
  --border: #c8e1d7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 20% 20%, var(--bg-a), transparent 40%),
    radial-gradient(circle at 80% 0%, var(--bg-b), transparent 35%),
    #f7fcf9;
  display: grid;
  place-items: center;
  padding: 20px;
}

.panel {
  width: min(100%, 520px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 12px 40px rgba(0, 60, 35, 0.08);
  padding: 24px;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
}

.sub {
  margin: 8px 0 20px;
  color: var(--muted);
}

label {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 8px;
  margin-top: 14px;
}

input,
button {
  width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 10px 12px;
  font-size: 1rem;
}

input {
  margin-bottom: 10px;
}

button {
  margin-bottom: 10px;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  transition: background-color 150ms ease;
}

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

#logoutBtn {
  background: #516b66;
}

#recaptcha-container {
  margin: 10px 0 8px;
}

.result {
  margin-top: 14px;
  border-top: 1px dashed var(--border);
  padding-top: 14px;
}

.result h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

pre {
  margin: 0;
  padding: 12px;
  background: #f2faf5;
  border-radius: 10px;
  overflow: auto;
  white-space: pre-wrap;
}