*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

.tongthe{
    display: flex;
    min-height: 100vh;
}

.cotphu {
    width: 220px;             
    background-color: #2c3e50;
    color: white;
    padding: 20px;
}

.cotphu h2 {
    font-size: 22px;
    margin-bottom: 30px;
}

.cotphu ul {
    list-style: none;         
}

.cotphu ul li {
    margin-bottom: 15px;
}

.cotphu ul li a {
    color: #bdc3c7;           
    text-decoration: none;    
    display: block;
    font-size: 15px;
}


.cotphu ul li a:hover {
    color: white;
    font-weight: bold;
}

.cotchinh {
    flex: 1;                  
    background-color: #f4f6f8; 
    padding: 30px;
}

.cotchinh h1 {
    font-size: 24px;
    margin-bottom: 20px;
}


.thecha {
    display: flex;            
    gap: 20px;                
    margin-bottom: 35px;
}


.the {
    flex: 1;                  
    background-color: white;
    padding: 20px;
    border-radius: 10px;       
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05); 
}

.the h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: #333;
}

.the p {
    font-size: 14px;
    color: #666;
}

.cotchinh h2 {
    font-size: 18px;
    margin-bottom: 15px;
}

table {
    width: 100%;
    border-collapse: collapse; 
    background-color: white;
    border-radius: 8px;
    overflow: hidden;          
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

table th, table td {
    padding: 14px 16px;
    text-align: left;
}

table th {
    background-color: #f8f9fa;
    font-size: 14px;
    color: #333;
}

table td {
    border-top: 1px solid #eee;
    font-size: 14px;
    color: #555;
}