* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
}

/* 登录页面样式 */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 30px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.login-container h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.form-group {
    margin-bottom: 20px;
}

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

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

.login-btn {
    width: 100%;
    padding: 12px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 20px;
}

.login-btn:hover {
    background-color: #45a049;
}

.error-message {
    color: red;
    text-align: center;
    margin-top: 15px;
}

/* 数据展示页面样式 */
.dashboard-container {
    max-width: 1200px;
    margin: 50px auto;
    padding: 30px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.dashboard-container h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}

.date-selector {
    margin-bottom: 30px;
    text-align: center;
}

.date-selector label {
    font-weight: bold;
    margin-right: 10px;
}

.date-selector input {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-right: 10px;
}

.date-selector button {
    padding: 8px 16px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.date-selector button:hover {
    background-color: #45a049;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.stat-card h3 {
    margin-bottom: 10px;
    color: #666;
    font-size: 14px;
}

.stat-card p {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.chart-container {
    margin-bottom: 30px;
    height: 400px;
}

#logoutBtn {
    display: block;
    margin: 0 auto;
    padding: 10px 20px;
    background-color: #f44336;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#logoutBtn:hover {
    background-color: #da190b;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .login-container {
        margin: 50px 20px;
    }
    
    .dashboard-container {
        margin: 20px;
        padding: 20px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .chart-container {
        height: 300px;
    }
}