body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f6f9;
    margin: 0;
    padding: 0;
    color: #333;
}

header {
    background-color: #007bff;
    color: white;
    padding: 15px 20px;
    text-align: center;
    font-size: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contact-link {
    background-color: #fff;
    color: #007bff;
    padding: 5px 15px;
    border-radius: 20px;
    text-decoration: none;
    font-weight: bold;
    font-size: 0.9rem;
}

.contact-link:hover {
    background-color: #e0e0e0;
    text-decoration: none;
}

.container {
    max-width: 85%;
    margin: 20px auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1, h2 {
    margin-top: 0;
    color: #333;
}

/* 表单样式 */
.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-input {
    width: 100%;
    padding: 10px;
    margin-bottom: 16px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 1rem;
}

.btn-submit {
    background-color: #28a745;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}

.btn-submit:hover {
    background-color: #218838;
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    background: #f9f9f9;
    margin: 8px 0;
    padding: 10px;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

a {
    color: #007bff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

nav {
    margin: 10px 0;
    text-align: center;
}

nav a {
    margin: 0 10px;
}
/* 顶部导航栏 */
nav.main-nav {
    background-color: #007bff;
    padding: 10px 20px;
    display: flex;
    justify-content: center;
    gap: 30px;
    font-weight: 600;
}

nav.main-nav a {
    color: white;
    text-decoration: none;
    font-size: 1rem;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

nav.main-nav a:hover {
    background-color: #0056b3;
}

.btn-delete {
    background-color: #ff4d4d;
    color: white;
    border: none;
    padding: 8px 12px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 14px;
}

.btn-delete:hover {
    background-color: #cc0000;
}

/* 手机端响应式 */
@media screen and (max-width: 600px) {
  header {
    flex-direction: column;
    gap: 10px;
  }
  
  .container {
    margin: 10px;
    padding: 15px 10px;
    max-width: 100%;
  }
  nav.main-nav {
    flex-direction: column;
    gap: 10px;
    padding: 10px;
  }
  nav.main-nav a {
    display: block;
    font-size: 1.1rem;
    padding: 10px 0;
    text-align: center;
  }
  ul li {
    flex-direction: column;
    align-items: flex-start;
  }
  ul li > * {
    margin: 4px 0;
  }
  form input, form button {
    font-size: 1.1rem;
    padding: 12px;
  }
  form button {
    margin-top: 12px;
  }
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
    width: 100%;
  }
}

/* 卡片式账户列表 */
.account-card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin: 20px auto;
    max-width: 85%;
}

.account-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.account-table th, .account-table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: center;
}

.account-table th {
    background-color: #007bff;
    color: white;
}

/* 表单统一样式 */
.form-container {
    max-width: 600px;
    margin: 40px auto;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

.btn {
    background-color: #007bff;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
}

.btn:hover {
    background-color: #0056b3;
}

.error {
    color: #ff0000;
    background-color: #ffe6e6;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
}

.form-label {
    display: block;
    margin-top: 15px;
    font-weight: bold;
}

.form-input {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.btn-submit {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.btn-submit:hover {
    background-color: #0056b3;
}

/* 页面标题 */
.page-title {
    text-align: center;
    margin-top: 40px;
    color: #333;
}

/* 暂无账户提示 */
.no-accounts {
    text-align: center;
    margin-top: 40px;
    color: #777;
}

/* 返回首页按钮 */
.return-home {
    text-align: center;
    margin-top: 30px;
}

.return-home a {
    text-decoration: none;
    color: #007bff;
    font-weight: bold;
}

.return-home a:hover {
    text-decoration: underline;
}

/* Switch样式 */
.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: #2196F3;
}

input:focus + .slider {
  box-shadow: 0 0 1px #2196F3;
}

input:checked + .slider:before {
  transform: translateX(26px);
}