body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.admin-container {
    display: flex;
    width: 100%;
    height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #3498db;
    color: white;
    padding: 20px;
    position: fixed; /* 固定定位 */
    top: 0;
    left: 0;
    height: 100vh; /* 占满整个视口高度 */
    overflow-y: auto; /* 允许垂直滚动 */
}

.content {
    flex: 1;
    padding: 20px;
    margin-left: 270px; /* 调整为270px，确保与导航菜单并排显示 */
    overflow-y: auto;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

.login-container {
    max-width: 400px;
    margin: 40px auto;
    padding: 40px;
    border-radius: 15px;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    text-align: center;
}

.dashboard-container, .assign-container, .add-merchant-container, .add-machine-container {
    max-width: 600px;
    margin: 40px auto;
    padding: 30px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background-color: #fff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

h1, h2 {
    color: #2c3e50;
    font-weight: 600;
    margin-bottom: 20px;
}

h2 {
    color: #fff;
    font-weight: 700;
    margin-bottom: 30px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.error {
    color: #e74c3c;
    font-weight: bold;
    background-color: rgba(233, 150, 122, 0.2);
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 20px;
    border: 1px solid rgba(233, 150, 122, 0.5);
}

form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

label {
    font-weight: 500;
    color: #34495e;
}

label {
    font-weight: 500;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 1px;
}

input[type="text"], input[type="email"], input[type="password"], select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus, select:focus {
    border-color: #3498db;
    outline: none;
}

input[type="text"], input[type="email"], input[type="password"], select {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    transition: background-color 0.3s;
}

input[type="text"]:focus, input[type="email"]:focus, input[type="password"]:focus, select:focus {
    background: rgba(255, 255, 255, 0.2);
    outline: none;
}

button {
    background-color: #3498db;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

button {
    background-color: #4a90e2;
    color: white;
    padding: 15px 25px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.3s, transform 0.3s;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.4);
}

button:hover {
    background-color: #3a7bd5;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.5);
}

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

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #3498db;
    color: white;
    font-weight: 500;
}

tr:hover {
    background-color: #f9f9f9;
}

.btn {
    display: inline-block;
    background-color: #3498db;
    color: white;
    padding: 12px 20px;
    text-decoration: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #2980b9;
}

/* 新增样式 */
header {
    background-color: #3498db;
    color: white;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header nav ul {
    list-style-type: none;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}

header nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s;
}

header nav ul li a:hover {
    color: #ecf0f1;
}

footer {
    background-color: #34495e;
    color: white;
    text-align: center;
    padding: 15px 0;
    margin-top: 40px;
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        width: 95%;
    }

    header nav ul {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }
}