body { 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    padding: 20px; 
    background-color: #eef2f5; 
    color: #333;
}
.container { 
    background: #fff; 
    padding: 30px; 
    border-radius: 12px; 
    max-width: 950px; 
    margin: auto; 
    box-shadow: 0 4px 15px rgba(0,0,0,0.08); 
}
.header { 
    display: flex; 
    justify-content: space-between; 
    align-items: flex-start;
    margin-bottom: 25px; 
    border-bottom: 2px solid #eaeaea; 
    padding-bottom: 20px; 
}
.customer-info {
    display: flex;
    flex-direction: column;
    gap: 15px;
    width: 60%;
}
.input-group {
    display: flex;
    align-items: center;
    gap: 10px;
}
.input-group label {
    min-width: 95px;
    font-weight: bold;
    font-size: 16px;
}
.input-group input, .input-group select {
    flex: 1; 
    padding: 10px 15px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
}
.date-section {
    background: #f8f9fa;
    padding: 15px 20px;
    border-radius: 8px;
    border: 1px solid #eee;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 16px;
}
.form-group { 
    display: flex; 
    gap: 10px; 
    margin-bottom: 20px; 
    flex-wrap: wrap; 
    align-items: center;
}
.form-group select, .form-group input { 
    padding: 10px; 
    border: 1px solid #ccc; 
    border-radius: 6px; 
    font-size: 15px; 
}
.form-group input[type="number"] {
    width: 80px;
}
button { 
    color: #fff; 
    cursor: pointer; 
    border: none; 
    border-radius: 6px;
    font-size: 16px;
    transition: background 0.3s;
}
.add-btn { background: #28a745; padding: 10px 20px; }
.add-btn:hover { background: #218838; }
.delete-btn { background: #dc3545; padding: 8px 12px; }
.delete-btn:hover { background: #c82333; }
.print-btn { 
    background: #007bff; 
    margin-top: 30px; 
    width: 100%; 
    padding: 15px;
    font-size: 20px; 
    font-weight: bold;
}
.print-btn:hover { background: #0056b3; }
table { 
    width: 100%; 
    border-collapse: collapse; 
    margin-top: 10px; 
}
th, td { 
    border: 1px solid #ddd; 
    padding: 12px; 
    text-align: center; 
}
th { background-color: #f1f3f5; font-size: 16px; }
.total-section { 
    text-align: left; 
    margin-top: 25px; 
    color: #2c3e50;
    padding-top: 15px;
    border-top: 2px dashed #ccc;
}
.summary-line {
    font-size: 18px;
    margin-bottom: 8px;
}
.grand-total-line {
    font-size: 24px; 
    font-weight: bold; 
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #eee;
}