:root {
  color-scheme: light;
  font-family: "Microsoft JhengHei", "Noto Sans TC", system-ui, sans-serif;
  color: #18342d;
  background: #eef4ec;
}

* { box-sizing: border-box; }

body {
  min-width: 280px;
  min-height: 100vh;
  margin: 0;
  background: #eef4ec;
}

button,
input { font: inherit; }

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 16px;
}

.login-card {
  width: min(100%, 420px);
  padding: 32px;
  border: 1px solid #c8d8c4;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 14px 40px rgba(25, 58, 48, 0.12);
}

.brand-mark {
  width: 52px;
  height: 52px;
  display: block;
  border-radius: 6px;
  background: #fff;
  object-fit: contain;
}

.eyebrow {
  margin: 22px 0 4px;
  color: #4a7567;
  font-size: 0.9rem;
  font-weight: 700;
}

h1 { margin: 0; font-size: clamp(1.65rem, 6vw, 2.1rem); }

.intro {
  margin: 12px 0 24px;
  color: #53665f;
  line-height: 1.7;
}

label { display: block; margin-bottom: 8px; font-weight: 700; }

.password-row { display: flex; gap: 8px; }

input {
  min-width: 0;
  flex: 1;
  padding: 12px 14px;
  border: 1px solid #9db5ac;
  border-radius: 8px;
  color: #18342d;
  background: #fff;
}

input:focus {
  outline: 3px solid rgba(74, 117, 103, 0.18);
  border-color: #356b59;
}

button { cursor: pointer; }

.text-button {
  padding: 0 12px;
  border: 1px solid #b9cbc4;
  border-radius: 8px;
  color: #214f42;
  background: #f5f8f4;
}

.submit-button {
  width: 100%;
  margin-top: 14px;
  padding: 12px 16px;
  border: 0;
  border-radius: 8px;
  background: #214f42;
  color: #fff;
  font-weight: 800;
}

.submit-button:disabled { cursor: wait; opacity: 0.65; }

.status { min-height: 1.5em; margin: 10px 0 0; color: #b42323; font-size: 0.92rem; }

details {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid #dce5d9;
  color: #52665f;
  font-size: 0.92rem;
  line-height: 1.65;
}

summary { cursor: pointer; color: #214f42; font-weight: 700; }

@media (max-width: 480px) {
  .login-card { padding: 24px 20px; }
}