/* === 登入頁全域設定 === */
:root {
  --bg: #f6f7fb;
  --card: #fff;
  --text: #222;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #b91c1c;
  --ok: #16a34a;
  --info-bg: #dbeafe;
  --info-text: #1e40af;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* === 登入卡片區 === */
.login-wrap {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 28px 22px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  animation: fadeIn 0.4s ease;
}
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* === 標題 === */
.app-title {
  margin: 0 0 6px;
  font-size: 20px;
  color: var(--muted);
  font-weight: 600;
  text-align: center;
}
.card-title {
  margin: 0 0 20px;
  font-size: 24px;
  text-align: center;
}

/* === 輸入欄位 === */
.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}
.field span {
  font-size: 14px;
  color: var(--muted);
}
.field input {
  height: 42px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.field input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

/* === 登入按鈕與連結 === */
.actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
}
.btn-primary {
  height: 42px;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, filter 0.2s;
}
.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}
.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  filter: grayscale(0.2);
}
.link {
  font-size: 14px;
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}
.link:hover {
  text-decoration: underline;
  color: var(--primary-hover);
}

/* === 底部資訊 === */
.footer-note {
  margin-top: 16px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

/* === 訊息提示框 === */
.msg {
  min-height: 20px;
  margin-bottom: 10px;
  font-size: 14px;
  text-align: center;
  border-radius: 8px;
  padding: 6px 10px;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.msg.show {
  opacity: 1;
}
.msg.error {
  color: var(--danger);
  background: #fee2e2;
  border: 1px solid #fecaca;
}
.msg.ok {
  color: var(--ok);
  background: #dcfce7;
  border: 1px solid #bbf7d0;
}
.msg.info {
  color: var(--info-text);
  background: var(--info-bg);
  border: 1px solid #bfdbfe;
}

/* === 小螢幕微調 === */
@media (max-width: 480px) {
  .login-card {
    padding: 22px 20px 18px;
    border-radius: 12px;
  }
  .card-title {
    font-size: 20px;
  }
  .btn-primary {
    width: 100%;
  }
}